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[PATCH 1/6] create wrappers for converting kuid_t to/from uid_t

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: [PATCH 1/6] create wrappers for converting kuid_t to/from uid_t
From: Dwight Engen <dwight.engen@xxxxxxxxxx>
Date: Fri, 28 Jun 2013 11:11:07 -0400
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxx>, xfs@xxxxxxxxxxx, Serge Hallyn <serge.hallyn@xxxxxxxxxx>, Brian Foster <bfoster@xxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20130626020924.GD29376@dastard>
Organization: Oracle Corporation
References: <20130619110948.0bfafa2b@xxxxxxxxxx> <20130620001341.GM29338@dastard> <20130620095410.1917d235@xxxxxxxxxx> <20130620220311.GT29376@dastard> <20130621111420.5592707e@xxxxxxxxxx> <20130624003316.GH29376@dastard> <20130624091035.6274800f@xxxxxxxxxx> <20130626020924.GD29376@dastard>
Signed-off-by: Dwight Engen <dwight.engen@xxxxxxxxxx>
---
 fs/xfs/xfs_linux.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/fs/xfs/xfs_linux.h b/fs/xfs/xfs_linux.h
index 800f896..761e4c0 100644
--- a/fs/xfs/xfs_linux.h
+++ b/fs/xfs/xfs_linux.h
@@ -159,6 +159,32 @@
 #define MAX(a,b)       (max(a,b))
 #define howmany(x, y)  (((x)+((y)-1))/(y))
 
+/* Kernel uid/gid conversion. These are used to convert to/from the on disk
+ * uid_t/gid_t types to the kuid_t/kgid_t types that the kernel uses 
internally.
+ * The conversion here is type only, the value will remain the same since we
+ * are converting to the init_user_ns. The uid is later mapped to a particular
+ * user namespace value when crossing the kernel/user boundary.
+ */
+static inline __uint32_t xfs_kuid_to_uid(kuid_t uid)
+{
+       return from_kuid(&init_user_ns, uid);
+}
+
+static inline kuid_t xfs_uid_to_kuid(__uint32_t uid)
+{
+       return make_kuid(&init_user_ns, uid);
+}
+
+static inline __uint32_t xfs_kgid_to_gid(kgid_t gid)
+{
+       return from_kgid(&init_user_ns, gid);
+}
+
+static inline kgid_t xfs_gid_to_kgid(__uint32_t gid)
+{
+       return make_kgid(&init_user_ns, gid);
+}
+
 /*
  * Various platform dependent calls that don't fit anywhere else
  */
-- 
1.8.1.4

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