[PATCH 5/7] pid: Implement pid_nr

[Eric W. Biederman]

As we stop storing pid_t's and move to storing struct pid *.  We
need a way to get the pid_t from the struct pid to report to user
space what we have stored.

Having a clean well defined way to do this is especially important
as we move to multiple pid spaces as may need to report a different
value to the caller depending on which pid space the caller is in.

Signed-off-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
---
 include/linux/pid.h |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/include/linux/pid.h b/include/linux/pid.h
index 4007114..9fd547f 100644
--- a/include/linux/pid.h
+++ b/include/linux/pid.h
@@ -93,6 +93,14 @@ extern struct pid *find_get_pid(int nr);
 extern struct pid *alloc_pid(void);
 extern void FASTCALL(free_pid(struct pid *pid));
 
+static inline pid_t pid_nr(struct pid *pid)
+{
+	pid_t nr = 0;
+	if (pid)
+		nr = pid->nr;
+	return nr;
+}
+
 #define pid_next(task, type)					\
 	((task)->pids[(type)].node.next)
 
-- 
1.4.2.rc3.g7e18e-dirty

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