KAIO getting started

[Neal Katz <nkatz@xxxxxxxx>]

I was hoping you could help me get started w/ KAIO. I wrote a small test
program and got  errno 38 "Function not implemented" calling  aio_read.

Environment:
  Fresh mandrake installation.
  I applied the 2.2.13 patch against my  2.2.14-15 kernel (mandrake
distribution),  selected asynch I/O in confg, rebuilt kernel and
rebooted (I've build custom kernels before).
  Build the library

Program:
#include <linux/aio.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <fcntl.h>

int main(int argc, char *argv[])
{
  aiocb_t cb;
  struct stat st;
  int rc;
  int fd;
  char *b;

  memset( &cb, 0, sizeof(cb) );
  stat("/tmp/bigfile", &st);
  b = (char *)malloc(st.st_size+1);
  b[st.st_size] = 0;

  fd = open("/tmp/bigfile",O_RDWR  );
  cb.aio_fildes = fd;
  cb.aio_nbytes = st.st_size;
  cb.aio_buf = b;

  rc = aio_read(&cb);
  printf("read rc = %i errno = %i\n",rc,errno);
  if (rc==-1) {
    perror("aio_read failed");
    return 1;
  }
  while(1) {
    rc = aio_error(&cb);
    printf("error rc = %i\n",rc);
    if (rc == EINPROGRESS) {
      sleep(1);
    } else {
      break;
    }
  }
  puts(b);
  close(fd);
  return 0;
}


Build Command
 cc  test1.c -ldba

The output is:
read rc = -1 errno = 38
aio_read failed: Function not implemented

Thanx,

Neal Katz