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make mntns ->get()/->put()/->install()/->inum() work with &mnt_ns->ns 

Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2014-11-01 00:00:23 -04:00
parent 435d5f4bb2
commit 58be28256d
1 changed files with 13 additions and 8 deletions
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21
fs/namespace.c
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@ -1582,6 +1582,11 @@ static bool is_mnt_ns_file(struct dentry *dentry)
return true;
}
struct mnt_namespace *to_mnt_ns(struct ns_common *ns)
{
return container_of(ns, struct mnt_namespace, ns);
}
static bool mnt_ns_loop(struct dentry *dentry)
{
/* Could bind mounting the mount namespace inode cause a
@ -1591,7 +1596,7 @@ static bool mnt_ns_loop(struct dentry *dentry)
if (!is_mnt_ns_file(dentry))
return false;
mnt_ns = get_proc_ns(dentry->d_inode)->ns;
mnt_ns = to_mnt_ns(get_proc_ns(dentry->d_inode)->ns);
return current->nsproxy->mnt_ns->seq >= mnt_ns->seq;
}
@ -3146,14 +3151,14 @@ found:
static void *mntns_get(struct task_struct *task)
{
struct mnt_namespace *ns = NULL;
struct ns_common *ns = NULL;
struct nsproxy *nsproxy;
task_lock(task);
nsproxy = task->nsproxy;
if (nsproxy) {
ns = nsproxy->mnt_ns;
get_mnt_ns(ns);
ns = &nsproxy->mnt_ns->ns;
get_mnt_ns(to_mnt_ns(ns));
}
task_unlock(task);
@ -3162,13 +3167,13 @@ static void *mntns_get(struct task_struct *task)
static void mntns_put(void *ns)
{
put_mnt_ns(ns);
put_mnt_ns(to_mnt_ns(ns));
}
static int mntns_install(struct nsproxy *nsproxy, void *ns)
{
struct fs_struct *fs = current->fs;
struct mnt_namespace *mnt_ns = ns;
struct mnt_namespace *mnt_ns = to_mnt_ns(ns);
struct path root;
if (!ns_capable(mnt_ns->user_ns, CAP_SYS_ADMIN) ||
@ -3200,8 +3205,8 @@ static int mntns_install(struct nsproxy *nsproxy, void *ns)
static unsigned int mntns_inum(void *ns)
{
struct mnt_namespace *mnt_ns = ns;
return mnt_ns->ns.inum;
struct ns_common *p = ns;
return p->inum;
}
const struct proc_ns_operations mntns_operations = {