include/linux/vs_context.h

   1 #ifndef _VX_VS_CONTEXT_H
   2 #define _VX_VS_CONTEXT_H
   3
   4
   5 #include <linux/kernel.h>
   6 #include <linux/rcupdate.h>
   7 #include <linux/sched.h>
   8
   9 #include "vserver/context.h"
  10 #include "vserver/debug.h"
  11
  12
  13 extern int proc_pid_vx_info(struct task_struct *, char *);
  14
  15
  16 #define get_vx_info(i)  __get_vx_info(i,__FILE__,__LINE__)
  17
  18 static inline struct vx_info *__get_vx_info(struct vx_info *vxi,
  19         const char *_file, int _line)
  20 {
  21         if (!vxi)
  22                 return NULL;
  23         vxlprintk(VXD_CBIT(xid, 2), "get_vx_info(%p[#%d.%d])",
  24                 vxi, vxi?vxi->vx_id:0, vxi?atomic_read(&vxi->vx_usecnt):0,
  25                 _file, _line);
  26         atomic_inc(&vxi->vx_usecnt);
  27         return vxi;
  28 }
  29
  30
  31 #define free_vx_info(i) \
  32         call_rcu(&i->vx_rcu, rcu_free_vx_info);
  33
  34 #define put_vx_info(i)  __put_vx_info(i,__FILE__,__LINE__)
  35
  36 static inline void __put_vx_info(struct vx_info *vxi, const char *_file, int _line)
  37 {
  38         if (!vxi)
  39                 return;
  40         vxlprintk(VXD_CBIT(xid, 2), "put_vx_info(%p[#%d.%d])",
  41                 vxi, vxi?vxi->vx_id:0, vxi?atomic_read(&vxi->vx_usecnt):0,
  42                 _file, _line);
  43         if (atomic_dec_and_test(&vxi->vx_usecnt))
  44                 free_vx_info(vxi);
  45 }
  46
  47 #define set_vx_info(p,i) __set_vx_info(p,i,__FILE__,__LINE__)
  48
  49 static inline void __set_vx_info(struct vx_info **vxp, struct vx_info *vxi,
  50         const char *_file, int _line)
  51 {
  52         BUG_ON(*vxp);
  53         if (!vxi)
  54                 return;
  55         vxlprintk(VXD_CBIT(xid, 3), "set_vx_info(%p[#%d.%d.%d])",
  56                 vxi, vxi?vxi->vx_id:0,
  57                 vxi?atomic_read(&vxi->vx_usecnt):0,
  58                 vxi?atomic_read(&vxi->vx_refcnt):0,
  59                 _file, _line);
  60         atomic_inc(&vxi->vx_refcnt);
  61         *vxp = __get_vx_info(vxi, _file, _line);
  62 }
  63
  64 #define clr_vx_info(p)  __clr_vx_info(p,__FILE__,__LINE__)
  65
  66 static inline void __clr_vx_info(struct vx_info **vxp,
  67         const char *_file, int _line)
  68 {
  69         struct vx_info *vxo = *vxp;
  70
  71         if (!vxo)
  72                 return;
  73         vxlprintk(VXD_CBIT(xid, 3), "clr_vx_info(%p[#%d.%d.%d])",
  74                 vxo, vxo?vxo->vx_id:0,
  75                 vxo?atomic_read(&vxo->vx_usecnt):0,
  76                 vxo?atomic_read(&vxo->vx_refcnt):0,
  77                 _file, _line);
  78         *vxp = NULL;
  79         wmb();
  80         if (vxo && atomic_dec_and_test(&vxo->vx_refcnt))
  81                 unhash_vx_info(vxo);
  82         __put_vx_info(vxo, _file, _line);
  83 }
  84
  85
  86 #define task_get_vx_info(i)     __task_get_vx_info(i,__FILE__,__LINE__)
  87
  88 static __inline__ struct vx_info *__task_get_vx_info(struct task_struct *p,
  89         const char *_file, int _line)
  90 {
  91         struct vx_info *vxi;
  92
  93         task_lock(p);
  94         vxlprintk(VXD_CBIT(xid, 5), "task_get_vx_info(%p)",
  95                 p, _file, _line);
  96         vxi = __get_vx_info(p->vx_info, _file, _line);
  97         task_unlock(p);
  98         return vxi;
  99 }
 100
 101
 102 #define vx_verify_info(p,i)     \
 103         __vx_verify_info((p)->vx_info,i,__FILE__,__LINE__)
 104
 105 static __inline__ void __vx_verify_info(
 106         struct vx_info *vxa, struct vx_info *vxb,
 107         const char *_file, int _line)
 108 {
 109         if (vxa == vxb)
 110                 return;
 111         printk(KERN_ERR "vx bad assumption (%p==%p) at %s:%d\n",
 112                 vxa, vxb, _file, _line);
 113 }
 114
 115
 116 #else
 117 #warning duplicate inclusion
 118 #endif