This is 6'th version of extened inode owner patch-set.
Please review it tell me what do you think about all this.
Are you agree with this approach?
Are you worry about some implementation details?
Is it ready for merge to some devel's tree?
*Feature description*
1) Inode may has a project identifier which has same meaning as uid/gid.
2) Id is stored in inode's xattr named "system.project_id"
3) Id is inherent from parent inode on creation.
4) This id is cached in memory inode structure vfs_inode->i_prjid
This field it restricted by CONFIG_PROJECT_ID. So no wasting
of memory happens.
5) Since id is cached in memory it may be used for different purposes
such as:
5A) Implement additional quota id space orthogonal to uid/gid. This is
useful in managing quota for some filesystem hierarchy(chroot or
container over bindmount)
5B) Export dedicated fs hierarchy to nfsd (only inode which has some
project_id will be accessible via nfsd)
6) It is possible to create isolated project's subtree.
Note: Please do not blame isolation feature before you read the
isolation patch description, and than please wellcome.
*User interface *
Project id is managed via generic xattr interface "system.project_id"
This good because
1) We may use already existing interface.
2) xattr already supported by generic urils tar/rsync and etc
PATCH SET TOC:
1) generic projectid support
2) generic project quota support
3) ext4 project support implementation
3A) ext4: generic project support
3B) ext4: project quota support
3C) ext4: project isolation support. This patch is not principal
but makes ext4 implementation rename behaviour equotals
to XFS
Patch against linux-next-20100318
Changes against v5
- convert dquota_transfer to struct iattr interface. Not it is possible
to change i_prjid via notify_changes()
- some bugfixes.
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