[PATCH RFC 5/8] utsns: introduce utsns_get_inum()

This allows other parts of the kernel to have access to userspace visible namespace identification. Signed-off-by: Aristeu Rozanski <arozansk(a)redhat.com&gt; --- include/linux/utsname.h | 1 + kernel/utsname.c | 14 ++++++++++++++ 2 files changed, 15 insertions(+), 0 deletions(-) diff --git a/include/linux/utsname.h b/include/linux/utsname.h index 239e277..eed8ca8 100644 --- a/include/linux/utsname.h +++ b/include/linux/utsname.h @@ -36,6 +36,7 @@ static inline void get_uts_ns(struct uts_namespace *ns) extern struct uts_namespace *copy_utsname(unsigned long flags, struct user_namespace *user_ns, struct uts_namespace *old_ns); extern void free_uts_ns(struct kref *kref); +extern unsigned int utsns_get_inum(struct task_struct *tsk); static inline void put_uts_ns(struct uts_namespace *ns) { diff --git a/kernel/utsname.c b/kernel/utsname.c index a47fc5d..146e95c 100644 --- a/kernel/utsname.c +++ b/kernel/utsname.c @@ -130,6 +130,20 @@ static unsigned int utsns_inum(void *vp) return ns->proc_inum; } +unsigned int utsns_get_inum(struct task_struct *tsk) +{ + struct nsproxy *nsproxy; + unsigned int rc = 0; + + rcu_read_lock(); + nsproxy = task_nsproxy(tsk); + if (nsproxy) + rc = utsns_inum(task_nsproxy(tsk)->uts_ns); + rcu_read_unlock(); + + return rc; +} + const struct proc_ns_operations utsns_operations = { .name = "uts", .type = CLONE_NEWUTS, -- 1.7.1