linux-ext4 - [PATCH 0/5] RFC: introduce extended inode owner identifier v9

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Date:	Thu, 21 Jun 2012 13:08:48 +0400
From:	Dmitry Monakhov <dmonakhov@...nvz.org>
To:	linux-ext4@...r.kernel.org
Cc:	linux-fsdevel@...r.kernel.org,
	Dmitry Monakhov <dmonakhov@...nvz.org>
Subject: [PATCH 0/5] RFC: introduce extended inode owner identifier v9

Hi, I've updated old standing project quota id patch-set.
Please take a look at it and replay me your oppinion, especially if you
do not like it by some reason :) This is really important because i do
want this feature to be merged sooner or later.

*Feature description*
1) Inode may has a project identifier which has same meaning as uid/gid.
2) In general case Id is stored in inode's xattr named "system.project_id"
   NOTE: by historical reasons XFS has speciffic API,
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)

*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: small mount flags cleanup
4) ext4 project support implementation
 4A) ext4: generic project support
 4B) ext4: project quota support
 NOTE:Ext4 quota is now managed via e2fsprogs, changes which add prjquota suppport for
 e2fsprogs will be submitted as separate patch-set.
5) XFS: prjquota and grpquota may coexist now

Patch against next-20120605-1-g20a6ee4
Actually vfs part is really small, and most changes happen in ext4-tree

Changes against V7
 - Small fix for project switch error path
 - Remove usless macro expressions
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.

Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
---
 Makefile |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/Makefile b/Makefile
index 0d718ed..8dbcc39 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@ VERSION = 3
 PATCHLEVEL = 5
 SUBLEVEL = 0
 EXTRAVERSION = -rc1
-NAME = Saber-toothed Squirrel
+NAME = Saber-toothed Squirrel-tree-quota

 # *DOCUMENTATION*
 # To see a list of typical targets execute "make help"
-- 
1.7.1

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