Re: [RFC] shmem: Add eventfd notification on utlilization level

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On 03/10/2015 03:22 PM, Jan Kara wrote:
> On Tue 10-03-15 06:03:23, Christoph Hellwig wrote:
>> On Tue, Mar 10, 2015 at 10:51:41AM +0900, Kyungmin Park wrote:
>>> Any updates?
>> Please just add disk quota support to tmpfs so thast the standard quota
>> netlink notifications can be used.
>   If I understand the problem at hand, they are really interested in
> notification when running out of free space. Using quota for that doesn't
> seem ideal since that tracks used space per user, not free space on fs as a
> whole.
>
> But if I remember right there were discussions about ENOSPC notification
> from filesystem for thin provisioning usecases. It would be good to make
> this consistent with those but I'm not sure if it went anywhere.
>
> 								Honza

The ideal case here, would be to get the notification, despite the type
of the actual filesystem, whenever the amount of free space drops below
a certain level. Quota doesn't seem to be the right approach here.

BR
Beata Michalska

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