[PATCH] identifier to nsproxy

Add an identifier to nsproxy.  The default init_ns_proxy has identifier 0 and
allocated nsproxies are given -1.

This identifier will be used by a new syscall sys_bind_ns.

Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Cc: Kirill Korotaev <dev@openvz.org>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index 5c49891..90c5f9a 100644 (file)
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -75,6 +75,7 @@ extern struct nsproxy init_nsproxy;
 #define INIT_NSPROXY(nsproxy) {                                                \
        .count          = ATOMIC_INIT(1),                               \
        .nslock         = __SPIN_LOCK_UNLOCKED(nsproxy.nslock),         \
+       .id             = 0,                                            \
        .uts_ns         = &init_uts_ns,                                 \
        .mnt_ns         = NULL,                                         \
        INIT_IPC_NS(ipc_ns)                                             \

diff --git a/include/linux/nsproxy.h b/include/linux/nsproxy.h
index 0aba1b1..27f37c1 100644 (file)
--- a/include/linux/nsproxy.h
+++ b/include/linux/nsproxy.h
@@ -23,6 +23,7 @@ struct ipc_namespace;
 struct nsproxy {
        atomic_t count;
        spinlock_t nslock;
+       unsigned long id;
        struct uts_namespace *uts_ns;
        struct ipc_namespace *ipc_ns;
        struct mnt_namespace *mnt_ns;

diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index bd9cb43..f223c15 100644 (file)
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -45,8 +45,10 @@ static inline struct nsproxy *clone_namespaces(struct nsproxy *orig)
        struct nsproxy *ns;
 
        ns = kmemdup(orig, sizeof(struct nsproxy), GFP_KERNEL);
-       if (ns)
+       if (ns) {
                atomic_set(&ns->count, 1);
+               ns->id = -1;
+       }
        return ns;
 }