On Tue, Jul 31, 2012 at 3:14 PM, Jens Axboe <axboe@xxxxxxxxx> wrote:
> 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
>
I've attached the output of strace -f fio --rw=write --fallocate=keep
--filename=hello --size=1G --runtime=10 --time_based --name=test
Hope this helps,
Kevin Castiglia
Attachment:
strace_output.log
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