[Gluster-devel] Quota-2

[Vijaikumar Mallikarjuna]

Hi All,

Here is the summary of discussion we had today on Quota-v2

Project, user and group quotas will use the same logic of accounting the
usage

Quota-v2 should be compatible with both DHT-v1 and DHT-v2

Project quotas will use gfid of the given path as the project-id.
    each inode will have a associated project-id which needs to be embedded
within inode.
    when creating new file, it will inherit project-id from its parent
inode.
    In case if parent inode doesn't contain project-id, then there should
be a mechanism to
    find the project-id given a gfid, so back-pointers can solve this
problem
    which xlator DHT/marker will set the project-id in the inode? this
needs to be decided

User and group quotas will use uid and gid to account the usage

Quota has below set of operation which should be performed as a single
transaction
      read current size
      read current contribution
      update delta to the contribution
      update size to user/project inode
In the current directory quota, to make this transaction crash consistent
we use a mechanism of setting dirty flag in a parent inode.
This mechanism will not work efficiently with project quotas. Journaling
will be the good solution for crash-consistency.

Quota 2 depends on:
      back-pointers: to find project-id from gfid
      journaling: for crash consistency of accounting


Thanks,
Vijay
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