#3595 HIGH Untriag: Make CoW link-breaking preserve broken link's uid/gid.

[Zarro Boogs per Child]

#3595: Make CoW link-breaking preserve broken link's uid/gid.
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 Reporter:  mstone  |       Owner:  jg       
     Type:  defect  |      Status:  new      
 Priority:  high    |   Milestone:  Untriaged
Component:  distro  |     Version:           
 Keywords:          |    Verified:  0        
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 cscott and mstone discovered and analyzed a update-related bug from Sep.
 17-19 that, when encountered, corrupts files' gid fields.

 Bertl (Herbert Poetzl) also analyzed the bug and discovered that it was
 more widespread than we initially believed: he showed that it affects all
 CoW hard-links (which we intend to use extensively through-out our
 filesystem, for Trial-3).

 He has developed a [http://vserver.13thfloor.at/Experimental/delta-cow-
 fix13.diff kernel patch] that he believes will fix the problem.

 He also developed a minimal [http://paste.linux-vserver.org/6631 test-
 case] that we can use to verify the fix.

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Ticket URL: <https://dev.laptop.org/ticket/3595>
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