Public bug reported:
My system:
$ uname -a
Linux blackhole 3.2.0-53-generic #81-Ubuntu SMP Thu Aug 22 21:01:03 UTC 2013
x86_64 x86_64 x86_64 GNU/Linux
Problem: The following program which uses libaio doesn't work - No
errors but no data is read. Exactly same program works if I just remove
the O_DIRECT flag while opening the file.
#define _GNU_SOURCE /* syscall() is not POSIX */
#include <stdio.h> /* for perror() */
#include <unistd.h> /* for syscall() */
#include <libaio.h> /* for AIO types and constants */
#include <fcntl.h> /* O_RDWR */
#include <string.h> /* memset() */
#include <inttypes.h> /* uint64_t */
int main()
{
io_context_t ctx;
struct iocb cb;
struct iocb *cbs[1];
struct io_event events[1];
int fd;
char *data;
fd = open("/tmp/testfile", O_RDONLY | O_CREAT | O_DIRECT);
ctx = 0;
printf("Setup : %d\n", io_setup(128, &ctx));
printf("Aligned : %d\n", posix_memalign(&data, 512, 40));
io_prep_pread(&cb, fd, data, 40, 0);
cbs[0] = &cb;
printf("Submitted : %d\n", io_submit(ctx, 1, cbs));
printf("Got Events : %d\n", io_getevents(ctx, 1, 1, events, NULL));
printf("%ld\n", events[0].res);
printf("%s\n", data);
printf("Destroyed : %d\n", io_destroy(ctx));
return 0;
}
Results:
$ ./a.out
Setup : 0
Aligned : 0
Submitted : 1
Got Events : 1
-22
Destroyed : 0
** Affects: libaio (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1223400
Title:
libaio with O_DIRECT doesn't seem to work
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