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