On 2012-07-12 22:51, Kevin Castiglia wrote:
> Hello,
>
> fio with fallocate fails with ENOSYS, but I'm unable to reproduce this
> failure outside of fio. The following command:
> fio --rw=write --fallocate=keep --filename=hello --size=1G
> --runtime=10 --time_based --name=test
> reports an error (if there is no file named 'hello' in my current
> working directory).
>
> Within the output I see: err=38 (file:filesetup.c:98, func=fallocate,
> error=Function not implemented)
>
> The following C program prints 0 (if there is no file named testing in
> my current working directory):
>
> #include <linux/falloc.h>
> #include <stdio.h>
> #include <errno.h>
>
> int main() {
>
> int f = open("testing", "O_CREAT", "0644");
> int r = fallocate(f, 01, 0, 1073741824);
> printf("%d\n", r);
>
> }
>
> Why is the fio command above failing with ENOSYS when this test
> program runs without errors?
>
> Also,
>
> $ strace fallocate -n -l 1G test
> ...
> fallocate(3, 01, 0, 1073741824) = 0
> ...
>
> the fallocate system call seems to work.
>
> I'm using Fedora 16 , fio 2.07, and an ext4 filesystem
>
> $ fio --version
> fio 2.0.7
>
> $ uname -r
> 3.1.0-7.fc16.x86_64
>
> $ mount
> ...
> /dev/mapper/vg_kcastiglia-lv_home on /home type ext4
> (rw,relatime,seclabel,user_xattr,acl,barrier=1,data=ordered)
> ...
>
> $ ldd --version
> ldd (GNU libc) 2.14.90
> ...
>
> $ gcc --version
> gcc (GCC) 4.6.3 20120306 (Red Hat 4.6.3-2)
> ...
It'd help if you strace (-f) fio to show the issue.
--
Jens Axboe
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