[Ocfs2-users] where can i find shared-du and shared-filefrag ?

[Lentes, Bernd]

----- Am 14. Aug 2019 um 22:44 schrieb herbert van den bergh herbert.van.den.bergh at oracle.com:

> Hi Bernd,
> 
> The filefrag utility has been modified to report the shared flag of
> extents in the -e output[1], but it depends on the distro you use
> whether that version is available.
> 
> I don't think the shared-du changes were accepted upstream. You may be
> able to find the patches that implemented the feature in the du utility
> online somewhere.  If you're using Oracle Linux, I may be able to find a
> version that works for you. Just let me know the OL and kernel version
> you're using.

Hi Herbert,

it does:

ll
total 31457284
-rw-r--r-- 1 qemu qemu 16106127360 Aug 15 14:26 greensql.raw
-rw-r--r-- 1 root root 16106127360 Aug 14 17:27 greensql.raw.snap

ha-idg-1:/mnt/ocfs2 # filefrag -e greensql.raw
Filesystem type is: 7461636f
File size of greensql.raw is 16106127360 (3932160 blocks of 4096 bytes)
 ext:     logical_offset:        physical_offset: length:   expected: flags:
   0:        0..     255:   24772864..  24773119:    256:             shared
   1:      256..     511:   33108224..  33108479:    256:   24773120:
   2:      512..    1023:   33133312..  33133823:    512:   33108480:
   3:     1024..  262143:   24773888..  25035007: 261120:   33133824: shared
   4:   262144..  262399:   33030656..  33030911:    256:   25035008:
   5:   262400..  262655:   25035264..  25035519:    256:   33030912: shared
   6:   262656..  263167:   33030912..  33031423:    512:   25035520:
   7:   263168..  263423:   33059584..  33059839:    256:   33031424:
   8:   263424..  263935:   25036288..  25036799:    512:   33059840: shared
   9:   263936..  264191:   33060096..  33060351:    256:   25036800:
  10:   264192..  264703:   33031424..  33031935:    512:   33060352:
  11:   264704..  275455:   25037568..  25048319:  10752:   33031936: shared

I'm using SLES 12 SP4.

Some more questions:
The reflink (greensql.raw.snap) does not change, that means it's like a snapshot ?
But if i delete the reflinked file (greensql.raw) my snapshot is lost because it shares extents ?
If i delete the reflink, nothing happens beside that my snapshot is gone ?
That means i can delete it easily if i don't need it any longer ?
And if i need the current file i just use the reflinked file, i don't have to do s.th like merging oder blockcommitting ?

Thanks.

Bernd


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