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Date:	Sun, 13 Sep 2015 21:20:29 +0900
From:	Li Xi <pkuelelixi@...il.com>
To:	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-api@...r.kernel.org, tytso@....edu, adilger@...ger.ca,
	jack@...e.cz, viro@...iv.linux.org.uk, hch@...radead.org,
	dmonakhov@...nvz.org
Subject: [v15 0/4] ext4: add project quota support

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:
* v15 <- v14:
 - Rebase to newest master branch of git repository (b0a1ea51b).
* v14 <- v13:
 - Cleanup ioctl of setting project ID;
 - Do not check project quota inode number specially;
 - Check isize when extract project ID from disk;
 - Rebase to latest kernel (4.0.0)
* v13 <- v12:
 - Update inode size check of project ID.
* v12 <- v11:
 - Relax the permission check when setting project ID.
* v11 <- v10:
 - Remove project quota mount option;
 - Fix permission check when setting project ID.
* v10 <- v9:
 - Remove non-journaled project quota interface;
 - Only allow admin to read project quota info;
 - Cleanup FS_IOC_FSSETXATTR/FS_IOC_FSGETXATTR interface.
* v9 <- v8:
 - Remove non-journaled project quota;
 - Rebase to newest dev branch of ext4 repository (3.19.0-rc3).
* 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().

v14: http://article.gmane.org/gmane.linux.kernel.api/10345
v13: http://www.spinics.net/lists/linux-fsdevel/msg85205.html
v12: http://www.spinics.net/lists/linux-fsdevel/msg84905.html
v11: http://www.spinics.net/lists/linux-ext4/msg47450.html
v10: http://www.spinics.net/lists/linux-ext4/msg47413.html
v9: http://www.spinics.net/lists/linux-ext4/msg47326.html
v8: http://www.spinics.net/lists/linux-ext4/msg46545.html
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 (4):
  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          |   85 +++++++----
 fs/ext4/ialloc.c        |    7 +
 fs/ext4/inode.c         |   28 ++++
 fs/ext4/ioctl.c         |  367 ++++++++++++++++++++++++++++++++++++-----------
 fs/ext4/namei.c         |   19 +++
 fs/ext4/super.c         |   57 +++++++-
 fs/xfs/libxfs/xfs_fs.h  |   47 +++----
 include/uapi/linux/fs.h |   33 +++++
 8 files changed, 490 insertions(+), 153 deletions(-)

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