[PATCH 3/6] vfs: Add additional owner identifier

[Dmitry Monakhov <dmonakhov@openvz.org>]

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
---
 fs/Kconfig            |    7 +++++++
 include/linux/fs.h    |    5 +++++
 include/linux/xattr.h |    3 +++
 3 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/fs/Kconfig b/fs/Kconfig
index 64d44ef..ad47589 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -54,6 +54,13 @@ config FILE_LOCKING
 	  This option enables standard file locking support, required
           for filesystems like NFS and for the flock() system
           call. Disabling this option saves about 11k.
+config METAGROUP
+	bool "Enable metagroup inode identifier"
+	default y
+	help
+	  This option enables metagroup inode identifier. Metagroup
+	  may be used as auxiliary owner specifier in addition to
+	  standard uid/gid.
 
 source "fs/notify/Kconfig"
 
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 0cd0105..f1139ed 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1586,6 +1586,11 @@ struct aux_attributes
 	 * and protected by i_lock similar to i_blocks+i_bytes. */
 	qsize_t* (*reserved_space)(struct inode *inode);
 #endif
+#ifdef CONFIG_METAGROUP
+	/* Metagroup id, protected by i_mutex similar to i_uid/i_gid*/
+	uid_t* (*metagroup)(struct inode *inode);
+#endif
+
 };
 /*
  * Inode state bits.  Protected by inode_lock.
diff --git a/include/linux/xattr.h b/include/linux/xattr.h
index fb9b7e6..efd9ed1 100644
--- a/include/linux/xattr.h
+++ b/include/linux/xattr.h
@@ -33,6 +33,9 @@
 #define XATTR_USER_PREFIX "user."
 #define XATTR_USER_PREFIX_LEN (sizeof (XATTR_USER_PREFIX) - 1)
 
+#define XATTR_METAGROUP "system.metagroup"
+#define XATTR_METAGROUP_LEN (sizeof (XATTR_METAGROUP))
+
 struct inode;
 struct dentry;
 
-- 
1.6.6