[Bugs] [Bug 1362129] rename of a file can cause data loss in an replica/arbiter volume configuration

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1362129

Ravishankar N <ravishankar at redhat.com> changed:

           What    |Removed                     |Added
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           Doc Type|If docs needed, set a value |Bug Fix
              Flags|needinfo?(ravishankar at redha |
                   |t.com)                      |


--- Doc Text *updated* ---
Cause: 
If a file was renamed when the brick with only good copy in a replica 3 volume was down, then there was a possibility that it got removed as a part of entry self-heal when it came back up.

Consequence: 
This lead to loss of data because the only good copy was removed and the contents of the file from the bad bricks got healed into  it.

Fix: 
Since a lookup precedes all fops on gluster, the fix is to fail lookup of a file if there is no good copy (as determined by afr xttrs on it) during lookup. If lookup fails, rename also won't be allowed.

Result: 
There is no data loss.


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