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From: Itaru Kitayama <itaru.kitayama@linux.dev>
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Subject: ftruncate fails
Message-Id: <E7D462A2-EE93-4A57-9F15-8565EE1567F3@linux.dev>
Date: Mon, 8 Apr 2024 10:44:51 +0900
To: v9fs@lists.linux.dev
X-Migadu-Flow: FLOW_OUT

Hi,
With a recent kernel I see below program fails (Bus error) if executed =
from 9p mounted directory, not with the local filesystem (Ext4).


#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/syscall.h>
#include <linux/memfd.h>

int main() {
        char filename[] =3D __FILE__"_tmpfile_XXXXXX";
        int fd, size;
        size =3D getpagesize();
        fd =3D mkstemp(filename);
        if (ftruncate(fd, size)) {
                printf("error");
        }


}=