Project Quota on ZFS

Project quota is a new ZFS system space/object usage accounting
and enforcement mechanism. Similar as user/group quota, project
quota is another dimension of system quota. It bases on the new
object attribute - project ID.

Project ID is a numerical value to indicate to which project an
object belongs. An object only can belong to one project though
you (the object owner or privileged user) can change the object
project ID via 'chattr -p' or 'zfs project [-s] -p' explicitly.
The object also can inherit the project ID from its parent when
created if the parent has the project inherit flag (that can be
set via 'chattr +P' or 'zfs project -s [-p]').

By accounting the spaces/objects belong to the same project, we
can know how many spaces/objects used by the project. And if we
set the upper limit then we can control the spaces/objects that
are consumed by such project. It is useful when multiple groups
and users cooperate for the same project, or a user/group needs
to participate in multiple projects.

Support the following commands and functionalities:

zfs set projectquota@project
zfs set projectobjquota@project

zfs get projectquota@project
zfs get projectobjquota@project
zfs get projectused@project
zfs get projectobjused@project

zfs projectspace

zfs allow projectquota
zfs allow projectobjquota
zfs allow projectused
zfs allow projectobjused

zfs unallow projectquota
zfs unallow projectobjquota
zfs unallow projectused
zfs unallow projectobjused

chattr +/-P
chattr -p project_id
lsattr -p

This patch also supports tree quota based on the project quota via
"zfs project" commands set as following:
zfs project [-d|-r] <file|directory ...>
zfs project -C [-k] [-r] <file|directory ...>
zfs project -c [-0] [-d|-r] [-p id] <file|directory ...>
zfs project [-p id] [-r] [-s] <file|directory ...>

For "df [-i] $DIR" command, if we set INHERIT (project ID) flag on
the $DIR, then the proejct [obj]quota and [obj]used values for the
$DIR's project ID will be shown as the total/free (avail) resource.
Keep the same behavior as EXT4/XFS does.

Reviewed-by: Andreas Dilger <[email protected]>
Reviewed-by  Ned Bass <[email protected]>
Reviewed-by: Matthew Ahrens <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Fan Yong <[email protected]>
TEST_ZIMPORT_POOLS="zol-0.6.1 zol-0.6.2 master"
Change-Id: Ib4f0544602e03fb61fd46a849d7ba51a6005693c
Closes #6290 

1 files changed, 83 insertions, 0 deletions

diff --git a/include/sys/zfs_project.h b/include/sys/zfs_project.h
new file mode 100644
index 000000000..52d5204a6
--- /dev/null
+++ b/include/sys/zfs_project.h
@@ -0,0 +1,83 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (c) 2017, Intel Corporation. All rights reserved.
+ */
+
+#ifndef	_SYS_ZFS_PROJECT_H
+#define	_SYS_ZFS_PROJECT_H
+
+#ifndef _KERNEL
+#ifndef _SYS_MOUNT_H
+/* XXX: some hack to avoid include sys/mount.h */
+#define	_SYS_MOUNT_H
+#endif
+#endif
+
+#include <linux/fs.h>
+
+#ifdef FS_PROJINHERIT_FL
+#define	ZFS_PROJINHERIT_FL	FS_PROJINHERIT_FL
+#else
+#define	ZFS_PROJINHERIT_FL	0x20000000
+#endif
+
+#ifdef FS_IOC_FSGETXATTR
+typedef struct fsxattr zfsxattr_t;
+
+#define	ZFS_IOC_FSGETXATTR	FS_IOC_FSGETXATTR
+#define	ZFS_IOC_FSSETXATTR	FS_IOC_FSSETXATTR
+#else
+struct zfsxattr {
+	uint32_t	fsx_xflags;	/* xflags field value (get/set) */
+	uint32_t	fsx_extsize;	/* extsize field value (get/set) */
+	uint32_t	fsx_nextents;	/* nextents field value (get)   */
+	uint32_t	fsx_projid;	/* project identifier (get/set) */
+	uint32_t	fsx_cowextsize;
+	unsigned char	fsx_pad[8];
+};
+typedef struct zfsxattr zfsxattr_t;
+
+#define	ZFS_IOC_FSGETXATTR	_IOR('X', 31, zfsxattr_t)
+#define	ZFS_IOC_FSSETXATTR	_IOW('X', 32, zfsxattr_t)
+#endif
+
+#define	ZFS_DEFAULT_PROJID	(0ULL)
+/*
+ * It is NOT ondisk project ID value. Just means either the object has
+ * no project ID or the operation does not touch project ID attribute.
+ */
+#define	ZFS_INVALID_PROJID	(-1ULL)
+
+static inline boolean_t
+zpl_is_valid_projid(uint32_t projid)
+{
+	/*
+	 * zfsxattr::fsx_projid is 32-bits, when convert to uint64_t,
+	 * the higher 32-bits will be set as zero, so cannot directly
+	 * compare with ZFS_INVALID_PROJID (-1ULL)
+	 */
+	if ((uint32_t)ZFS_INVALID_PROJID == projid)
+		return (B_FALSE);
+	return (B_TRUE);
+}
+
+#endif	/* _SYS_ZFS_PROJECT_H */