[Box Backup] Old vs Deleted files removal

[Chris Wilson]

Hi Pete,

On Wed, 18 Feb 2009, Peter Jalajas, GigaLock Backup Services wrote:

> Yeah, I just squashed an account by lowering the soft limit
> substantially, and found the same results, Old files went to 0 GB and
> Deleted stayed at several GB.  To me, it didn't matter for that
> client, but I would guess that about equal numbers of users prefer it
> removing olds as deleteds, depending upon their situations at any
> given time.

I suspected as much, that it woulnd't be a simple matter of reversing the 
priorities.

> I've always been intrigued by this issue.  Chris, could you maybe please 
> point me to the source code file(s) that control this? Maybe I can take 
> a feeble stab at documenting the current logic anyway.

I think all the action happens in bin/bbstored/HousekeepStoreAccount.cpp. 
It starts in HousekeepStoreAccount::DoHousekeeping(), but that doesn't do 
much. The real action I suspect is in 
HousekeepStoreAccount::ScanDirectory() which is called on the root 
directory and calls itself recursively, building up a "map to count the 
distance from the mark" as it goes. That's where I get lost, I don't know 
what the "mark" is or what's done with this list yet.

Cheers, Chris.
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