Re: Debugging why fstrim doesn't work

[Matthias Schniedermeyer <ms@citd.de>]

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





-- 

Matthias