On 01.09.2014 09:16, Matthias Schniedermeyer wrote:
> On 01.09.2014 08:34, Bernhard Voelker wrote:
> > On 08/29/2014 11:35 AM, Matthias Schniedermeyer wrote:
> > > $ fstrim -v /
> > > fstrim: /: discard operation not supported.
> > >
> > > How can i debug why fstrim/the kernel thinks discard isn't supported?
> >
> > $ strace -v fstrim -v /
> > ...
> > ioctl(3, FITRIM, 0x7fff4d693590) = -1 EOPNOTSUPP (Operation not supported)
> > ...
> >
> > Interestingly, fstrim's error message has changed from the more precise
> >
> > fstrim: /: FITRIM ioctl failed: Operation not supported
> >
> > (e.g. in 2.23.2) to a probably more user-friendly
> >
> > fstrim: /: the discard operation is not supported
> >
> > (in the current git version).
>
> I don't get 'Operation not supported".
>
> I get this error:
> open("/", O_RDONLY|O_LARGEFILE) = 3
> fstat64(3, {st_dev=makedev(8, 2), st_ino=192, st_mode=S_IFDIR|0755, st_nlink=25, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=8, st_size=4096, st_atime=2014/07/02-21:06:38, st_mtime=2014/07/19-23:54:25, st_ctime=2014/07/19-23:54:25}) = 0
> ioctl(3, FITRIM, 0xfffa6198) = -1 ENOTTY (Inappropriate ioctl for device)
> close(3) = 0
And the answer is:
32bit userspace and 64bit kernels don't mix (in this case).
I've tested the 64bit version of fstrim and it worked.
--
Matthias
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