On Fri, Sep 25, 2015 at 1:12 AM, Andreas Dilger <adilger@xxxxxxxxx> wrote:
> On Sep 13, 2015, at 2:20 PM, Li Xi <pkuelelixi@xxxxxxxxx> wrote:
>>
>> The following patches propose an implementation of project quota
>> support for ext4. A project is an aggregate of unrelated inodes
>> which might scatter in different directories. Inodes that belong
>> to the same project possess an identical identification i.e.
>> 'project ID', just like every inode has its user/group
>> identification. The following patches add project quota as
>> supplement to the former uer/group quota types.
>
> We discussed this on the ext4 developer concall today and tried to
> move the landing of these patches forward. Some notes below:
>
> - Ted: agreed to reserve EXT4_FEATURE_RO_COMPAT_PROJECT, s_prj_quota_inum,
> EXT4_PROJINHERIT_FL, and i_projid fields for use by project quota to
> avoid compatibility issues if patches are not landed immediately.
> - Ted: to do final check of inode flag value
> - ext4 project quota inode does not need to use a reserved inode, but
> could after Jan's patch to increase reserved inodes lands
> - Li Xi: identify xfstests subtests that are exercising project quota
> - submit patches to xfstests that will activate them for ext4
> - keep in ext4 xfstests for testing until patches land upstream
> - this needs to be done before landing to ensure ext4 code works
> - Li Xi: document the behaviour of project quota (if no existing
> document exists for XFS already), some of this is already below
> - update man pages for df(1) and statfs(2) for subdir with project ID
> (i.e. that it returns only quota usage and limit for project ID)
> - Ted: where should document go? linux/Documentation/fs? ext4 wiki?
> - not a requirement for testing, can be done after landing
>
> - All: decide on a common tool for setting project ID on file/directory
> - don't want to require xfsutils in order to use project quota
> - start with chattr (using FS_IOC_FS{GET,SET}XATTR) in e2fsprogs
> - allows testing project quota with e2fsprogs/ext4
> - chproj (like chown/chgrp) would also be an option
> - needs more discussion/development effort, goes into fileutils
> - this doesn't need to be decided immediately, and both could be done
>
Hi,
I've pushed the patch of Ext4 as well as e2fsprogs. Shilong has added test
suits for ext4 project quota in xfstest, and will push patches soon. I
will write
necessary documentation both for manual and linux/Documentation/fs.
Hopefully, at least the kernel patches of ext4 project quota will be merged
soon.
Regards,
Li Xi
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