kernel/vserver/limit.c

   1 /*
   2  *  linux/kernel/vserver/limit.c
   3  *
   4  *  Virtual Server: Context Limits
   5  *
   6  *  Copyright (C) 2004  Herbert Pötzl
   7  *
   8  *  V0.01  broken out from vcontext V0.05
   9  *
  10  */
  11
  12 #include <linux/config.h>
  13 #include <linux/module.h>
  14 #include <linux/vserver/limit.h>
  15 #include <linux/vserver/context.h>
  16 #include <linux/vserver/switch.h>
  17 #include <linux/vs_base.h>
  18 #include <linux/vs_context.h>
  19 #include <linux/vs_limit.h>
  20
  21 #include <asm/errno.h>
  22 #include <asm/uaccess.h>
  23
  24
  25 const char *vlimit_name[NUM_LIMITS] = {
  26         [RLIMIT_CPU]            = "CPU",
  27         [RLIMIT_RSS]            = "RSS",
  28         [RLIMIT_NPROC]          = "NPROC",
  29         [RLIMIT_NOFILE] = "NOFILE",
  30         [RLIMIT_MEMLOCK]        = "VML",
  31         [RLIMIT_AS]             = "VM",
  32         [RLIMIT_LOCKS]          = "LOCKS",
  33         [RLIMIT_MSGQUEUE]       = "MSGQ",
  34         [VLIMIT_NSOCK]          = "NSOCK",
  35 };
  36
  37 EXPORT_SYMBOL_GPL(vlimit_name);
  38
  39
  40 static int is_valid_rlimit(int id)
  41 {
  42         int valid = 0;
  43
  44         switch (id) {
  45                 case RLIMIT_NPROC:
  46                 case RLIMIT_AS:
  47                 case RLIMIT_RSS:
  48                 case RLIMIT_MEMLOCK:
  49                 case RLIMIT_NOFILE:
  50                         valid = 1;
  51                         break;
  52         }
  53         return valid;
  54 }
  55
  56 static inline uint64_t vc_get_rlim(struct vx_info *vxi, int id)
  57 {
  58         unsigned long limit;
  59
  60         limit = vxi->limit.rlim[id];
  61         if (limit == RLIM_INFINITY)
  62                 return CRLIM_INFINITY;
  63         return limit;
  64 }
  65
  66 int vc_get_rlimit(uint32_t id, void __user *data)
  67 {
  68         struct vx_info *vxi;
  69         struct vcmd_ctx_rlimit_v0 vc_data;
  70
  71         if (copy_from_user (&vc_data, data, sizeof(vc_data)))
  72                 return -EFAULT;
  73         if (!is_valid_rlimit(vc_data.id))
  74                 return -ENOTSUPP;
  75
  76         vxi = locate_vx_info(id);
  77         if (!vxi)
  78                 return -ESRCH;
  79
  80         vc_data.maximum = vc_get_rlim(vxi, vc_data.id);
  81         vc_data.minimum = CRLIM_UNSET;
  82         vc_data.softlimit = CRLIM_UNSET;
  83         put_vx_info(vxi);
  84
  85         if (copy_to_user (data, &vc_data, sizeof(vc_data)))
  86                 return -EFAULT;
  87         return 0;
  88 }
  89
  90 int vc_set_rlimit(uint32_t id, void __user *data)
  91 {
  92         struct vx_info *vxi;
  93         struct vcmd_ctx_rlimit_v0 vc_data;
  94
  95         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RESOURCE))
  96                 return -EPERM;
  97         if (copy_from_user (&vc_data, data, sizeof(vc_data)))
  98                 return -EFAULT;
  99         if (!is_valid_rlimit(vc_data.id))
 100                 return -ENOTSUPP;
 101
 102         vxi = locate_vx_info(id);
 103         if (!vxi)
 104                 return -ESRCH;
 105
 106         if (vc_data.maximum != CRLIM_KEEP)
 107                 vxi->limit.rlim[vc_data.id] = vc_data.maximum;
 108         put_vx_info(vxi);
 109
 110         return 0;
 111 }
 112
 113 int vc_get_rlimit_mask(uint32_t id, void __user *data)
 114 {
 115         static struct vcmd_ctx_rlimit_mask_v0 mask = {
 116                         /* minimum */
 117                 0
 118                 ,       /* softlimit */
 119                 0
 120                 ,       /* maximum */
 121                 (1 << RLIMIT_NPROC) |
 122                 (1 << RLIMIT_NOFILE) |
 123                 (1 << RLIMIT_MEMLOCK) |
 124                 (1 << RLIMIT_AS) |
 125                 (1 << RLIMIT_RSS)
 126                 };
 127
 128         if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RESOURCE))
 129                 return -EPERM;
 130         if (copy_to_user(data, &mask, sizeof(mask)))
 131                 return -EFAULT;
 132         return 0;
 133 }
 134
 135
 136 void vx_vsi_meminfo(struct sysinfo *val)
 137 {
 138         struct vx_info *vxi = current->vx_info;
 139         unsigned long v;
 140
 141         v = vxi->limit.rlim[RLIMIT_RSS];
 142         if (v != RLIM_INFINITY)
 143                 val->totalram = min(val->totalram, v);
 144         v = atomic_read(&vxi->limit.rcur[RLIMIT_RSS]);
 145         val->freeram = (v < val->totalram) ? val->totalram - v : 0;
 146         val->bufferram = 0;
 147         val->totalhigh = 0;
 148         val->freehigh = 0;
 149         return;
 150 }
 151
 152 void vx_vsi_swapinfo(struct sysinfo *val)
 153 {
 154         struct vx_info *vxi = current->vx_info;
 155         unsigned long v, w;
 156
 157         v = vxi->limit.rlim[RLIMIT_RSS];
 158         w = vxi->limit.rlim[RLIMIT_AS];
 159         if (w != RLIM_INFINITY)
 160                 val->totalswap = min(val->totalswap, w -
 161                 ((v != RLIM_INFINITY) ? v : 0));
 162         w = atomic_read(&vxi->limit.rcur[RLIMIT_AS]);
 163         val->freeswap = (w < val->totalswap) ? val->totalswap - w : 0;
 164         return;
 165 }
 166