Re: Hmmmm.

And for those folks who use SunOS [45].x, here's a code snippet that changes
a file-system to have async metadata semantics on the fly. Just add a -DSYSV
to the cc line for SunOS 5.x.

Usage: ufsdio mountpoint [0|1]

0 makes metadata operations sync, 1 makes them async, no arg reports the
current state.

ufsdio.c:

#include <stdio.h>
#include <sys/filio.h>
#include <unistd.h>
#include <dirent.h>

main(int argc, char *argv[])
{
        DIR *dd;
        int doset=0;
        int io_op;
        long on=0;
        
        if (argc < 2 )
                exit( 1 );
        
        if ( argc > 2 ) {
                doset = 1;
                on = atoi(argv[2]);
        }

        if ((dd = opendir(argv[1])) == (DIR *)NULL)
        {
                perror( argv[1] );
                exit( 1);
        }

#ifdef SYSV
        io_op = doset ? _FIOSDIO : _FIOGDIO;
#else
        io_op = doset ? FIODIO : FIODIOS;
#endif
        if (ioctl( dd->dd_fd, io_op, &on )==-1)
        {
                perror( "ioctl: FIODIO" );
                exit(1);
        }
        
        if (! doset)
                printf ("Async flag for directory %s = %d\n", argv[1], on);

        exit( 0 );
}
Received on Tue Mar 18 1997 - 15:05:52 MST