This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / linux / vs_pid.h

diff --git a/include/linux/vs_pid.h b/include/linux/vs_pid.h
new file mode 100644 (file)
index 0000000..b695caa
--- /dev/null
+++ b/include/linux/vs_pid.h
@@ -0,0 +1,133 @@
+#ifndef _VS_PID_H
+#define _VS_PID_H
+
+#include "vserver/base.h"
+#include "vserver/context.h"
+#include "vserver/debug.h"
+#include <linux/pid_namespace.h>
+
+
+/* pid faking stuff */
+
+
+#define vx_info_map_pid(v,p) \
+       __vx_info_map_pid((v), (p), __FUNC__, __FILE__, __LINE__)
+#define vx_info_map_tgid(v,p)  vx_info_map_pid(v,p)
+#define vx_map_pid(p)  vx_info_map_pid(current->vx_info, p)
+#define vx_map_tgid(p) vx_map_pid(p)
+
+static inline int __vx_info_map_pid(struct vx_info *vxi, int pid,
+       const char *func, const char *file, int line)
+{
+       if (vx_info_flags(vxi, VXF_INFO_INIT, 0)) {
+               vxfprintk(VXD_CBIT(cvirt, 2),
+                       "vx_map_tgid: %p/%llx: %d -> %d",
+                       vxi, (long long)vxi->vx_flags, pid,
+                       (pid && pid == vxi->vx_initpid)?1:pid,
+                       func, file, line);
+               if (pid == 0)
+                       return 0;
+               if (pid == vxi->vx_initpid)
+                       return 1;
+       }
+       return pid;
+}
+
+#define vx_info_rmap_pid(v,p) \
+       __vx_info_rmap_pid((v), (p), __FUNC__, __FILE__, __LINE__)
+#define vx_rmap_pid(p) vx_info_rmap_pid(current->vx_info, p)
+#define vx_rmap_tgid(p) vx_rmap_pid(p)
+
+static inline int __vx_info_rmap_pid(struct vx_info *vxi, int pid,
+       const char *func, const char *file, int line)
+{
+       if (vx_info_flags(vxi, VXF_INFO_INIT, 0)) {
+               vxfprintk(VXD_CBIT(cvirt, 2),
+                       "vx_rmap_tgid: %p/%llx: %d -> %d",
+                       vxi, (long long)vxi->vx_flags, pid,
+                       (pid == 1)?vxi->vx_initpid:pid,
+                       func, file, line);
+               if ((pid == 1) && vxi->vx_initpid)
+                       return vxi->vx_initpid;
+               if (pid == vxi->vx_initpid)
+                       return ~0U;
+       }
+       return pid;
+}
+
+
+#define VXF_FAKE_INIT  (VXF_INFO_INIT|VXF_STATE_INIT)
+
+static inline
+int vx_proc_task_visible(struct task_struct *task)
+{
+       if ((task->pid == 1) &&
+               !vx_flags(VXF_FAKE_INIT, VXF_FAKE_INIT))
+               /* show a blend through init */
+               goto visible;
+       if (vx_check(vx_task_xid(task), VS_WATCH|VS_IDENT))
+               goto visible;
+       return 0;
+visible:
+       return 1;
+}
+
+static inline
+struct task_struct *vx_find_proc_task_by_pid(int pid)
+{
+       struct task_struct *task = find_task_by_real_pid(pid);
+
+       if (task && !vx_proc_task_visible(task)) {
+               vxdprintk(VXD_CBIT(misc, 6),
+                       "dropping task (find) %p[#%u,%u] for %p[#%u,%u]",
+                       task, task->xid, task->pid,
+                       current, current->xid, current->pid);
+               task = NULL;
+       }
+       return task;
+}
+
+static inline
+struct task_struct *vx_get_proc_task(struct inode *inode, struct pid *pid)
+{
+       struct task_struct *task = get_pid_task(pid, PIDTYPE_PID);
+
+       if (task && !vx_proc_task_visible(task)) {
+               vxdprintk(VXD_CBIT(misc, 6),
+                       "dropping task (get) %p[#%u,%u] for %p[#%u,%u]",
+                       task, task->xid, task->pid,
+                       current, current->xid, current->pid);
+               put_task_struct(task);
+               task = NULL;
+       }
+       return task;
+}
+
+
+static inline
+struct task_struct *vx_child_reaper(struct task_struct *p)
+{
+       struct vx_info *vxi = p->vx_info;
+       struct task_struct *reaper = child_reaper(p);
+
+       if (!vxi)
+               goto out;
+
+       BUG_ON(!p->vx_info->vx_reaper);
+
+       /* child reaper for the guest reaper */
+       if (vxi->vx_reaper == p)
+               goto out;
+
+       reaper = vxi->vx_reaper;
+out:
+       vxdprintk(VXD_CBIT(xid, 7),
+               "vx_child_reaper(%p[#%u,%u]) = %p[#%u,%u]",
+               p, p->xid, p->pid, reaper, reaper->xid, reaper->pid);
+       return reaper;
+}
+
+
+#else
+#warning duplicate inclusion
+#endif