Re: Reclaim space from unused ramdisk?

[Jan Engelhardt <jengelh@linux01.gwdg.de>]

>I wonder if it would be possible to somehow reclaim space that has
>been previously reserved for a ramdisk without rebooting.

free_ramdisk.c:

#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

int main(int argc, const char **argv) {
    int eax = 0;
    while(*argv != NULL) {
        int fd = open(*argv, O_RDWR);
        if(fd < 0) {
            fprintf(stderr, "Warning: Cannot open %s: %s\n",
             *argv, strerror(errno));
            if(eax == 0) { eax = errno; }
            continue;
        }
        ioctl(fd, BLKFLSBUF, 0);
        close(fd);
        ++argv;
    }
    return eax == 0;
}

//eof


>How difficult would this be to write?


Jan Engelhardt
-- 
| Alphagate Systems, http://alphagate.hopto.org/
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