Signed-off-by: Dmitry Monakhov <dmonakhov@xxxxxxxxxx>
---
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
--
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