linux-ext4 - Re: [v8 0/5] ext4: add project quota support

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Date:	Mon, 26 Jan 2015 13:46:38 -0500
From:	jon ernst <jonernst07@...il.com>
To:	Li Xi <pkuelelixi@...il.com>
Cc:	"linux-ext4@...r.kernel.org List" <linux-ext4@...r.kernel.org>
Subject: Re: [v8 0/5] ext4: add project quota support

Xi,
Just a question, do you have any test scripts or xfstest cases for
this patchset?

Thanks,
Jon

On Tue, Dec 9, 2014 at 12:22 AM, Li Xi <pkuelelixi@...il.com> 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.
>
> The semantics of ext4 project quota is consistent with XFS. Each
> directory can have EXT4_INODE_PROJINHERIT flag set. When the
> EXT4_INODE_PROJINHERIT flag of a parent directory is not set, a
> newly created inode under that directory will have a default project
> ID (i.e. 0). And its EXT4_INODE_PROJINHERIT flag is not set either.
> When this flag is set on a directory, following rules will be kept:
>
> 1) The newly created inode under that directory will inherit both
> the EXT4_INODE_PROJINHERIT flag and the project ID from its parent
> directory.
>
> 2) Hard-linking a inode with different project ID into that directory
> will fail with errno EXDEV.
>
> 3) Renaming a inode with different project ID into that directory
> will fail with errno EXDEV. However, 'mv' command will detect this
> failure and copy the renamed inode to a new inode in the directory.
> Thus, this new inode will inherit both the project ID and
> EXT4_INODE_PROJINHERIT flag.
>
> 4) If the project quota of that ID is being enforced, statfs() on
> that directory will take the quotas as another upper limits along
> with the capacity of the file system, i.e. the total block/inode
> number will be the minimum of the quota limits and file system
> capacity.
>
> Changelog:
> * v8 <- v7:
>  - Rebase to newest dev branch of ext4 repository (3.18.0_rc3).
> * v7 <- v6:
>  - Map ext4 inode flags to xflags of struct fsxattr;
>  - Add patch to cleanup ext4 inode flag definitions.
> * v6 <- v5:
>  - Add project ID check for cross rename;
>  - Remove patch of EXT4_IOC_GETPROJECT/EXT4_IOC_SETPROJECT ioctl
> * v5 <- v4:
>  - Check project feature when set/get project ID;
>  - Do not check project feature for project quota;
>  - Add support of FS_IOC_FSSETXATTR/FS_IOC_FSGETXATTR.
> * v4 <- v3:
>  - Do not check project feature when set/get project ID;
>  - Use EXT4_MAXQUOTAS instead of MAXQUOTAS in ext4 patches;
>  - Remove unnecessary change of fs/quota/dquot.c;
>  - Remove CONFIG_QUOTA_PROJECT.
> * v3 <- v2:
>  - Add EXT4_INODE_PROJINHERIT semantics.
> * v2 <- v1:
>  - Add ioctl interface for setting/getting project;
>  - Add EXT4_FEATURE_RO_COMPAT_PROJECT;
>  - Add get_projid() method in struct dquot_operations;
>  - Add error check of ext4_inode_projid_set/get().
>
> v7: http://www.spinics.net/lists/linux-fsdevel/msg80404.html
> v6: http://www.spinics.net/lists/linux-fsdevel/msg80022.html
> v5: http://www.spinics.net/lists/linux-api/msg04840.html
> v4: http://lwn.net/Articles/612972/
> v3: http://www.spinics.net/lists/linux-ext4/msg45184.html
> v2: http://www.spinics.net/lists/linux-ext4/msg44695.html
> v1: http://article.gmane.org/gmane.comp.file-systems.ext4/45153
>
> Any comments or feedbacks are appreciated.
>
> Regards,
>                                          - Li Xi
>
> Li Xi (5):
>   vfs: adds general codes to enforces project quota limits
>   ext4: adds project ID support
>   ext4: adds project quota support
>   ext4: adds FS_IOC_FSSETXATTR/FS_IOC_FSGETXATTR interface support
>   ext4: cleanup inode flag definitions
>
>  fs/ext4/ext4.h             |  190 +++++++++++++++++++++----
>  fs/ext4/ialloc.c           |    6 +
>  fs/ext4/inode.c            |   29 ++++
>  fs/ext4/ioctl.c            |  330 +++++++++++++++++++++++++++++++-------------
>  fs/ext4/namei.c            |   17 +++
>  fs/ext4/super.c            |   96 +++++++++++--
>  fs/quota/dquot.c           |   35 ++++-
>  fs/quota/quota.c           |    8 +-
>  fs/quota/quotaio_v2.h      |    6 +-
>  fs/xfs/xfs_fs.h            |   47 +++----
>  include/linux/quota.h      |    2 +
>  include/uapi/linux/fs.h    |   59 ++++++++
>  include/uapi/linux/quota.h |    6 +-
>  13 files changed, 650 insertions(+), 181 deletions(-)
>
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