diff options
| author | Cedric Le Goater <clg@fr.ibm.com> | 2006-12-08 02:37:59 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-08 08:28:52 -0800 |
| commit | 9a575a92db3312a40cdf0b0406d88de88ad9741e (patch) | |
| tree | 0b789528da13cd31f7fb206f184cfa123cc0ba42 /kernel | |
| parent | 61a58c6c238cc81f7742b8cc84212cc55fb57747 (diff) | |
| download | linux-9a575a92db3312a40cdf0b0406d88de88ad9741e.tar.bz2 | |
[PATCH] to nsproxy
Add the pid namespace framework to the nsproxy object. The copy of the pid
namespace only increases the refcount on the global pid namespace,
init_pid_ns, and unshare is not implemented.
There is no configuration option to activate or deactivate this feature
because this not relevant for the moment.
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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/nsproxy.c | 26 | ||||
| -rw-r--r-- | kernel/pid.c | 23 |
2 files changed, 42 insertions, 7 deletions
diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c index f223c15c18e9..e2ce748e96af 100644 --- a/kernel/nsproxy.c +++ b/kernel/nsproxy.c @@ -19,6 +19,7 @@ #include <linux/init_task.h> #include <linux/mnt_namespace.h> #include <linux/utsname.h> +#include <linux/pid_namespace.h> struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy); @@ -68,6 +69,8 @@ struct nsproxy *dup_namespaces(struct nsproxy *orig) get_uts_ns(ns->uts_ns); if (ns->ipc_ns) get_ipc_ns(ns->ipc_ns); + if (ns->pid_ns) + get_pid_ns(ns->pid_ns); } return ns; @@ -111,10 +114,17 @@ int copy_namespaces(int flags, struct task_struct *tsk) if (err) goto out_ipc; + err = copy_pid_ns(flags, tsk); + if (err) + goto out_pid; + out: put_nsproxy(old_ns); return err; +out_pid: + if (new_ns->ipc_ns) + put_ipc_ns(new_ns->ipc_ns); out_ipc: if (new_ns->uts_ns) put_uts_ns(new_ns->uts_ns); @@ -129,11 +139,13 @@ out_ns: void free_nsproxy(struct nsproxy *ns) { - if (ns->mnt_ns) - put_mnt_ns(ns->mnt_ns); - if (ns->uts_ns) - put_uts_ns(ns->uts_ns); - if (ns->ipc_ns) - put_ipc_ns(ns->ipc_ns); - kfree(ns); + if (ns->mnt_ns) + put_mnt_ns(ns->mnt_ns); + if (ns->uts_ns) + put_uts_ns(ns->uts_ns); + if (ns->ipc_ns) + put_ipc_ns(ns->ipc_ns); + if (ns->pid_ns) + put_pid_ns(ns->pid_ns); + kfree(ns); } diff --git a/kernel/pid.c b/kernel/pid.c index 25807e1b98dd..5319b9f2fc5e 100644 --- a/kernel/pid.c +++ b/kernel/pid.c @@ -59,6 +59,9 @@ static inline int mk_pid(struct pid_namespace *pid_ns, * the scheme scales to up to 4 million PIDs, runtime. */ struct pid_namespace init_pid_ns = { + .kref = { + .refcount = ATOMIC_INIT(2), + }, .pidmap = { [ 0 ... PIDMAP_ENTRIES-1] = { ATOMIC_INIT(BITS_PER_PAGE), NULL } }, @@ -356,6 +359,26 @@ struct pid *find_ge_pid(int nr) } EXPORT_SYMBOL_GPL(find_get_pid); +int copy_pid_ns(int flags, struct task_struct *tsk) +{ + struct pid_namespace *old_ns = tsk->nsproxy->pid_ns; + int err = 0; + + if (!old_ns) + return 0; + + get_pid_ns(old_ns); + return err; +} + +void free_pid_ns(struct kref *kref) +{ + struct pid_namespace *ns; + + ns = container_of(kref, struct pid_namespace, kref); + kfree(ns); +} + /* * The pid hash table is scaled according to the amount of memory in the * machine. From a minimum of 16 slots up to 4096 slots at one gigabyte or |