[gpfsug-discuss] fast ACL alter solution

[Martin Gasthuber]

Hi Marc,

  this was meant to be more a joke than a 'wish' - but it would be interesting for us (with the case of several millions of files having the same ACL) if there are ways/plans to treat ACLs more referenced from each of these files and having a mechanism to treat all of them in a single operation.

-- Martin
> On 7 Aug, 2015, at 23:21, Marc A Kaplan <makaplan at us.ibm.com> wrote:
> 
> You asked: 
> 
> "your description of the ACL implementation looks like each file has some sort of reference to the ACL - so multiple files could reference the same physical ACL data. In our case, we need to set a large number of files (and directories) to the same ACL (content) - could we take any benefit from these 'pseudo' referencing nature ? i.e. set ACL contents once and the job is done ;-). It looks that mmputacl can only access the ACL data 'through' a filename and not 'directly' - we just need the 'dirty' way ;-)" 
> 
> 
> Perhaps one could hack/patch that - but I can't recommend it.  Would you routinely hack/patch the GPFS metadata that comprises a directory?   
> Consider replicated and logged metadata ... Consider you've corrupted the hash table of all ACL values... 
> 
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