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utsns: extract creeate_uts_ns()

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create_uts_ns() will be used by C/R to create fresh uts_ns.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan 2009-06-17 16:27:54 -07:00 committed by Linus Torvalds
parent dca4a97960
commit 4c2a7e72d5
1 changed files with 11 additions and 2 deletions
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13
kernel/utsname.c
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@ -15,6 +15,16 @@
#include <linux/err.h> #include <linux/err.h>
#include <linux/slab.h> #include <linux/slab.h>
static struct uts_namespace *create_uts_ns(void)
{
struct uts_namespace *uts_ns;
uts_ns = kmalloc(sizeof(struct uts_namespace), GFP_KERNEL);
if (uts_ns)
kref_init(&uts_ns->kref);
return uts_ns;
}
/* /*
* Clone a new ns copying an original utsname, setting refcount to 1 * Clone a new ns copying an original utsname, setting refcount to 1
* @old_ns: namespace to clone * @old_ns: namespace to clone
@ -24,14 +34,13 @@ static struct uts_namespace *clone_uts_ns(struct uts_namespace *old_ns)
{ {
struct uts_namespace *ns; struct uts_namespace *ns;
ns = kmalloc(sizeof(struct uts_namespace), GFP_KERNEL); ns = create_uts_ns();
if (!ns) if (!ns)
return ERR_PTR(-ENOMEM); return ERR_PTR(-ENOMEM);
down_read(&uts_sem); down_read(&uts_sem);
memcpy(&ns->name, &old_ns->name, sizeof(ns->name)); memcpy(&ns->name, &old_ns->name, sizeof(ns->name));
up_read(&uts_sem); up_read(&uts_sem);
kref_init(&ns->kref);
return ns; return ns;
} }