2 * linux/kernel/vserver/limit.c
4 * Virtual Server: Context Limits
6 * Copyright (C) 2004-2006 Herbert Pƶtzl
8 * V0.01 broken out from vcontext V0.05
9 * V0.02 sync to valid limit check from 2.1.1
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>
20 #include <asm/errno.h>
21 #include <asm/uaccess.h>
24 const char *vlimit_name[NUM_LIMITS] = {
27 [RLIMIT_NPROC] = "NPROC",
28 [RLIMIT_NOFILE] = "NOFILE",
29 [RLIMIT_MEMLOCK] = "VML",
31 [RLIMIT_LOCKS] = "LOCKS",
32 [RLIMIT_SIGPENDING] = "SIGP",
33 [RLIMIT_MSGQUEUE] = "MSGQ",
35 [VLIMIT_NSOCK] = "NSOCK",
36 [VLIMIT_OPENFD] = "OPENFD",
37 [VLIMIT_ANON] = "ANON",
38 [VLIMIT_SHMEM] = "SHMEM",
41 EXPORT_SYMBOL_GPL(vlimit_name);
44 #define MASK_ENTRY(x) (1 << (x))
46 const struct vcmd_ctx_rlimit_mask_v0 vlimit_mask = {
52 MASK_ENTRY( RLIMIT_RSS ) |
53 MASK_ENTRY( RLIMIT_NPROC ) |
54 MASK_ENTRY( RLIMIT_NOFILE ) |
55 MASK_ENTRY( RLIMIT_MEMLOCK ) |
56 MASK_ENTRY( RLIMIT_AS ) |
57 MASK_ENTRY( RLIMIT_LOCKS ) |
58 MASK_ENTRY( RLIMIT_MSGQUEUE ) |
60 MASK_ENTRY( VLIMIT_ANON ) |
61 MASK_ENTRY( VLIMIT_SHMEM ) |
66 static int is_valid_vlimit(int id)
68 uint32_t mask = vlimit_mask.minimum |
69 vlimit_mask.softlimit | vlimit_mask.maximum;
70 return mask & (1 << id);
73 static inline uint64_t vc_get_rlim(struct vx_info *vxi, int id)
77 limit = vxi->limit.rlim[id];
78 if (limit == RLIM_INFINITY)
79 return CRLIM_INFINITY;
83 static int do_get_rlimit(xid_t xid, uint32_t id,
84 uint64_t *minimum, uint64_t *softlimit, uint64_t *maximum)
88 if (!is_valid_vlimit(id))
91 vxi = lookup_vx_info(xid);
96 *minimum = CRLIM_UNSET;
98 *softlimit = CRLIM_UNSET;
100 *maximum = vc_get_rlim(vxi, id);
105 int vc_get_rlimit(uint32_t id, void __user *data)
107 struct vcmd_ctx_rlimit_v0 vc_data;
110 if (copy_from_user (&vc_data, data, sizeof(vc_data)))
113 ret = do_get_rlimit(id, vc_data.id,
114 &vc_data.minimum, &vc_data.softlimit, &vc_data.maximum);
118 if (copy_to_user (data, &vc_data, sizeof(vc_data)))
123 static int do_set_rlimit(xid_t xid, uint32_t id,
124 uint64_t minimum, uint64_t softlimit, uint64_t maximum)
128 if (!is_valid_vlimit(id))
131 vxi = lookup_vx_info(xid);
135 if (maximum != CRLIM_KEEP)
136 vxi->limit.rlim[id] = maximum;
142 int vc_set_rlimit(uint32_t id, void __user *data)
144 struct vcmd_ctx_rlimit_v0 vc_data;
146 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RESOURCE))
148 if (copy_from_user (&vc_data, data, sizeof(vc_data)))
151 return do_set_rlimit(id, vc_data.id,
152 vc_data.minimum, vc_data.softlimit, vc_data.maximum);
155 #ifdef CONFIG_IA32_EMULATION
157 int vc_set_rlimit_x32(uint32_t id, void __user *data)
159 struct vcmd_ctx_rlimit_v0_x32 vc_data;
161 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RESOURCE))
163 if (copy_from_user (&vc_data, data, sizeof(vc_data)))
166 return do_set_rlimit(id, vc_data.id,
167 vc_data.minimum, vc_data.softlimit, vc_data.maximum);
170 int vc_get_rlimit_x32(uint32_t id, void __user *data)
172 struct vcmd_ctx_rlimit_v0_x32 vc_data;
175 if (copy_from_user (&vc_data, data, sizeof(vc_data)))
178 ret = do_get_rlimit(id, vc_data.id,
179 &vc_data.minimum, &vc_data.softlimit, &vc_data.maximum);
183 if (copy_to_user (data, &vc_data, sizeof(vc_data)))
188 #endif /* CONFIG_IA32_EMULATION */
191 int vc_get_rlimit_mask(uint32_t id, void __user *data)
193 if (copy_to_user(data, &vlimit_mask, sizeof(vlimit_mask)))
199 void vx_vsi_meminfo(struct sysinfo *val)
201 struct vx_info *vxi = current->vx_info;
204 v = vxi->limit.rlim[RLIMIT_RSS];
205 if (v != RLIM_INFINITY)
206 val->totalram = min(val->totalram, v);
207 v = atomic_read(&vxi->limit.rcur[RLIMIT_RSS]);
208 val->freeram = (v < val->totalram) ? val->totalram - v : 0;
215 void vx_vsi_swapinfo(struct sysinfo *val)
217 struct vx_info *vxi = current->vx_info;
220 v = vxi->limit.rlim[RLIMIT_RSS];
221 w = vxi->limit.rlim[RLIMIT_AS];
222 if (w != RLIM_INFINITY)
223 val->totalswap = min(val->totalswap, w -
224 ((v != RLIM_INFINITY) ? v : 0));
225 w = atomic_read(&vxi->limit.rcur[RLIMIT_AS]);
226 val->freeswap = (w < val->totalswap) ? val->totalswap - w : 0;