[PATCH RFC 1/8] mntns: introduce mntns_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; --- fs/namespace.c | 14 ++++++++++++++ include/linux/mnt_namespace.h | 2 ++ 2 files changed, 16 insertions(+), 0 deletions(-) diff --git a/fs/namespace.c b/fs/namespace.c index 50ca17d..b8a888f 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -2792,6 +2792,20 @@ static unsigned int mntns_inum(void *ns) return mnt_ns->proc_inum; } +unsigned int mntns_get_inum(struct task_struct *tsk) +{ + struct nsproxy *nsproxy; + int rc = 0; + + rcu_read_lock(); + nsproxy = task_nsproxy(tsk); + if (nsproxy) + rc = mntns_inum(nsproxy->mnt_ns); + rcu_read_unlock(); + + return rc; +} + const struct proc_ns_operations mntns_operations = { .name = "mnt", .type = CLONE_NEWNS, diff --git a/include/linux/mnt_namespace.h b/include/linux/mnt_namespace.h index 12b2ab5..b6afe65 100644 --- a/include/linux/mnt_namespace.h +++ b/include/linux/mnt_namespace.h @@ -5,10 +5,12 @@ struct mnt_namespace; struct fs_struct; struct user_namespace; +struct task_struct; extern struct mnt_namespace *copy_mnt_ns(unsigned long, struct mnt_namespace *, struct user_namespace *, struct fs_struct *); extern void put_mnt_ns(struct mnt_namespace *ns); +extern unsigned int mntns_get_inum(struct task_struct *tsk); extern const struct file_operations proc_mounts_operations; extern const struct file_operations proc_mountinfo_operations; -- 1.7.1