minor optimizations
[util-vserver.git] / util-vserver / lib / vserver-internal.h
1 // $Id$    --*- c++ -*--
2
3 // Copyright (C) 2003 Enrico Scholz <enrico.scholz@informatik.tu-chemnitz.de>
4 //  
5 // This program is free software; you can redistribute it and/or modify
6 // it under the terms of the GNU General Public License as published by
7 // the Free Software Foundation; version 2 of the License.
8 //  
9 // This program is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 // GNU General Public License for more details.
13 //  
14 // You should have received a copy of the GNU General Public License
15 // along with this program; if not, write to the Free Software
16 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
17
18 #ifdef H_VSERVER_SYSCALL_INTERNAL_H
19 #  error vserver-internal.h must not be included more than once
20 #endif
21
22 #ifndef H_VSERVER_SYSCALL_INTERNAL_H
23 #define H_VSERVER_SYSCALL_INTERNAL_H
24
25 #include <asm/unistd.h>
26 #include <syscall.h>
27 #include <errno.h>
28 #include <stdint.h>
29 #include <sys/syscall.h>
30 #include <unistd.h>
31
32 #include "internal.h"
33
34 #if !defined(__NR_vserver) && defined(ENSC_SYSCALL__NR_vserver)
35 #  define __NR_vserver  ENSC_SYSCALL__NR_vserver
36 #endif
37
38 #define VC_PREFIX       0)
39 #define VC_SUFFIX       else (void)((void)0
40 #define CALL_VC_NOOP    (void)0
41 #define CALL_VC_GENERAL(ID, SUFFIX, FUNC, ...)                          \
42   VC_PREFIX; VC_SELECT(ID) return FUNC ## _ ## SUFFIX(__VA_ARGS__); VC_SUFFIX
43
44 #ifdef VC_MULTIVERSION_SYSCALL
45 #  define VC_SELECT(ID) if (ver>=(ID))
46 #  define CALL_VC(...)                                  \
47   do {                                                  \
48     int ver = utilvserver_checkCompatVersion();         \
49     if (ver==-1) return -1;                             \
50     VC_SUFFIX, __VA_ARGS__, VC_PREFIX;                  \
51     errno = ENOSYS;                                     \
52     return -1;                                          \
53   } while (0)
54 #else
55 #  define VC_SELECT(ID) if (1)
56 #  define CALL_VC(...)                                  \
57   do {                                                  \
58     if (1) {} VC_SUFFIX, __VA_ARGS__, VC_PREFIX;        \
59     errno = ENOSYS; return -1;                          \
60   } while (0)
61 #endif
62
63 #ifdef VC_ENABLE_API_COMPAT
64 #  define CALL_VC_COMPAT(F,...) CALL_VC_GENERAL(0x00010000, compat, F, __VA_ARGS__)
65 #else
66 #  define CALL_VC_COMPAT(F,...) CALL_VC_NOOP
67 #endif
68
69 #ifdef VC_ENABLE_API_LEGACY
70 #  define CALL_VC_LEGACY(F,...) CALL_VC_GENERAL(0x00000000, legacy, F, __VA_ARGS__)
71 #else
72 #  define CALL_VC_LEGACY(F,...) CALL_VC_NOOP
73 #endif
74
75 #ifdef VC_ENABLE_API_V11
76 #  define CALL_VC_V11(F,...)    CALL_VC_GENERAL(0x00010000, v11, F, __VA_ARGS__)
77 #else
78 #  define CALL_VC_V11(F,...)    CALL_VC_NOOP
79 #endif
80
81 #ifdef VC_ENABLE_API_V13
82 #  define CALL_VC_V13(F,...)    CALL_VC_GENERAL(0x00010011, v13, F, __VA_ARGS__)
83 #else
84 #  define CALL_VC_V13(F,...)    CALL_VC_NOOP
85 #endif
86
87 #ifdef VC_ENABLE_API_V13
88 #  define CALL_VC_V13A(F,...)   CALL_VC_GENERAL(0x00010012, v13, F, __VA_ARGS__)
89 #else
90 #  define CALL_VC_V13A(F,...)   CALL_VC_NOOP
91 #endif
92
93 #ifdef VC_ENABLE_API_NET
94 #  define CALL_VC_NET(F,...)    CALL_VC_GENERAL(0x00010016, net, F, __VA_ARGS__)
95 #else
96 #  define CALL_VC_NET(F,...)    CALL_VC_NOOP
97 #endif
98
99 #ifdef VC_ENABLE_API_FSCOMPAT
100 #  define CALL_VC_FSCOMPAT(F,...)       CALL_VC_GENERAL(0x00010000, fscompat, F, __VA_ARGS__)
101 #else
102 #  define CALL_VC_FSCOMPAT(F,...)       CALL_VC_NOOP
103 #endif
104
105 #ifdef VC_ENABLE_API_OLDPROC
106 #  define CALL_VC_OLDPROC(F,...)        CALL_VC_GENERAL(0x00000000, oldproc, F, __VA_ARGS__)
107 #else
108 #  define CALL_VC_OLDPROC(F,...)        CALL_VC_NOOP
109 #endif
110
111 #ifdef VC_ENABLE_API_OLDUTS
112 #  define CALL_VC_OLDUTS(F,...)         CALL_VC_GENERAL(0x00000000, olduts, F, __VA_ARGS__)
113 #else
114 #  define CALL_VC_OLDUTS(F,...)         CALL_VC_NOOP
115 #endif
116
117
118   // Some  kernel <-> userspace wrappers; they should be noops in most cases
119
120 #if 1
121 #  define CTX_KERNEL2USER(X)    (((X)==(uint32_t)(-1)) ? VC_NOCTX   : \
122                                  ((X)==(uint32_t)(-2)) ? VC_SAMECTX : \
123                                  (xid_t)(X))
124
125 #  define CTX_USER2KERNEL(X)    (((X)==VC_DYNAMIC_XID) ? (uint32_t)(-1) : \
126                                  ((X)==VC_SAMECTX)     ? (uint32_t)(-2) : \
127                                  (uint32_t)(X))
128 #else
129 #  define CTX_USER2KERNEL(X)    (X)
130 #  define CTX_KERNEL2USER(X)    (X)
131 #endif
132
133 #if 1
134 #  define EXT2FLAGS_USER2KERNEL(X)      (((X) & ~(VC_IMMUTABLE_FILE_FL|VC_IMMUTABLE_LINK_FL)) | \
135                                          ((X) & VC_IMMUTABLE_FILE_FL ? EXT2_IMMUTABLE_FILE_FL : 0) | \
136                                          ((X) & VC_IMMUTABLE_LINK_FL ? EXT2_IMMUTABLE_LINK_FL : 0))
137 #  define EXT2FLAGS_KERNEL2USER(X)      (((X) & ~(EXT2_IMMUTABLE_FILE_FL|EXT2_IMMUTABLE_LINK_FL)) | \
138                                          ((X) & EXT2_IMMUTABLE_FILE_FL ? VC_IMMUTABLE_FILE_FL : 0) | \
139                                          ((X) & EXT2_IMMUTABLE_LINK_FL ? VC_IMMUTABLE_LINK_FL : 0))
140 #else
141 #  define EXT2FLAGS_KERNEL2USER(X)      (X)
142 #  define EXT2FLAGS_USER2KERNEL(X)      (X)
143 #endif
144
145 #if 1
146 #  define VHI_USER2KERNEL(X)            ((((X)==vcVHI_CONTEXT)    ? VHIN_CONTEXT    : \
147                                           ((X)==vcVHI_SYSNAME)    ? VHIN_SYSNAME    : \
148                                           ((X)==vcVHI_NODENAME)   ? VHIN_NODENAME   : \
149                                           ((X)==vcVHI_RELEASE)    ? VHIN_RELEASE    : \
150                                           ((X)==vcVHI_VERSION)    ? VHIN_VERSION    : \
151                                           ((X)==vcVHI_MACHINE)    ? VHIN_MACHINE    : \
152                                           ((X)==vcVHI_DOMAINNAME) ? VHIN_DOMAINNAME : \
153                                           (X)))
154 #  define VHI_KERNEL2USER(X)            ((((X)==VHIN_CONTEXT)     ? vcVHI_CONTEXT    : \
155                                           ((X)==VHIN_SYSNAME)     ? vcVHI_SYSNAME    : \
156                                           ((X)==VHIN_NODENAME)    ? vcVHI_NODENAME   : \
157                                           ((X)==VHIN_RELEASE)     ? vcVHI_RELEASE    : \
158                                           ((X)==VHIN_VERSION)     ? vcVHI_VERSION    : \
159                                           ((X)==VHIN_MACHINE)     ? vcVHI_MACHINE    : \
160                                           ((X)==VHIN_DOMAINNAME)  ? vcVHI_DOMAINNAME : \
161                                           (X)))
162 #else
163 #  define VHI_USER2KERNEL(X)            (X)
164 #  define VHI_KERNEL2USER(X)            (X)
165 #endif
166
167 #if 1
168 #  define NID_KERNEL2USER(X)    (((X)==(uint32_t)(-1)) ? VC_NONID   : \
169                                  (xid_t)(X))
170
171 #  define NID_USER2KERNEL(X)    (((X)==VC_DYNAMIC_NID) ? (uint32_t)(-1) : \
172                                  (uint32_t)(X))
173 #else
174 #  define NID_USER2KERNEL(X)    (X)
175 #  define NID_KERNEL2USER(X)    (X)
176 #endif
177
178 #if 1
179 #  define NETTYPE_USER2KERNEL(X)        ((X)==vcNET_IPV4   ? 0 : \
180                                          (X)==vcNET_IPV6   ? 1 : \
181                                          (X)==vcNET_IPV4R  ? 2 : \
182                                          (X)==vcNET_IPV6R  ? 3 : \
183                                          (X))
184 #  define NETTYPE_KERNEL2USER(X)        ((X)==0 ? vcNET_IPV4   ? : \
185                                          (X)==1 ? vcNET_IPV6   ? : \
186                                          (X)==2 ? vcNET_IPV4R  ? : \
187                                          (X)==3 ? vcNET_IPV6R  ? : \
188                                          (vc_net_nx_type)(X))
189 #else
190 #  define NETTYPE_USER2KERNEL(X)        (X)
191 #  define NETTYPE_KERNEL2USER(X)        (X)
192 #endif
193
194
195 #define EXT2_IOC_GETCONTEXT             _IOR('x', 1, long)
196 #define EXT2_IOC_SETCONTEXT             _IOW('x', 2, long)
197
198 #ifndef HAVE_VSERVER
199 #ifdef ENSC_SYSCALL_TRADITIONAL
200 inline static UNUSED ALWAYSINLINE
201 int vserver(uint32_t cmd, uint32_t id, void *data)
202 {
203 #if defined __dietlibc__
204   extern long int syscall (long int __sysno, ...);
205 #endif
206  
207   return syscall(__NR_vserver, cmd, id, data);
208 }
209 #else
210 inline static UNUSED ALWAYSINLINE
211 _syscall3(int, vserver,
212           uint32_t, cmd, uint32_t, id, void *, data)
213 #endif
214 #endif
215
216 #endif  //  H_VSERVER_SYSCALL_INTERNAL_H