*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 fs_inode structure and may be accessible
via s_op->get_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 (only inode which has some project_id
will be accessible)
*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 utilities 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
Patch against -next-20101028.
Actually vfs part is really small, and most changes happen in ext4-tree
Changes against v6
- get rid of iattr stuff, current __dquot_transfer() provides sane interface
for quota manipulation. i_prjid can must be changed only by fs-speciffic
methods so only get() method is really necessery.
- remove #ifdef tricks from generic code.
- move i_prjid from vfs_inode to fs_inode, to prevent inode bloating.
- get rid of isolation logic, because this feature confuse most users.
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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