[CRIU] [PATCH 02/17] userns: define protobuf messages for uid and gid maps

[Andrey Vagin]

Normally, one of the first steps after creating a new user namespace is
to define the mappings used for the user and group IDs of the processes
that will be created in that namespace. This is done by writing mapping
information to the /proc/PID/uid_map and /proc/PID/gid_map files
corresponding to one of the processes in the user namespace.

Signed-off-by: Andrey Vagin <avagin at openvz.org>
---
 protobuf/Makefile     |  1 +
 protobuf/userns.proto | 10 ++++++++++
 2 files changed, 11 insertions(+)
 create mode 100644 protobuf/userns.proto

diff --git a/protobuf/Makefile b/protobuf/Makefile
index 509f3c3..983629e 100644
--- a/protobuf/Makefile
+++ b/protobuf/Makefile
@@ -62,6 +62,7 @@ proto-obj-y	+= siginfo.o
 proto-obj-y	+= rpc.o
 proto-obj-y	+= ext-file.o
 proto-obj-y	+= cgroup.o
+proto-obj-y	+= userns.o
 
 proto		:= $(proto-obj-y:.o=)
 proto-c		:= $(proto-obj-y:.o=.pb-c.c)
diff --git a/protobuf/userns.proto b/protobuf/userns.proto
new file mode 100644
index 0000000..9428549
--- /dev/null
+++ b/protobuf/userns.proto
@@ -0,0 +1,10 @@
+message uid_gid_extent {
+	required uint32 first		= 1;
+	required uint32 lower_first	= 2;
+	required uint32 count		= 3;
+}
+
+message userns_entry {
+	repeated uid_gid_extent uid_map	= 1;
+	repeated uid_gid_extent gid_map = 2;
+}
-- 
1.9.3