src/afs/LINUX/osi_module.c

   1 /*
   2  * Copyright 2000, International Business Machines Corporation and others.
   3  * All Rights Reserved.
   4  *
   5  * This software has been released under the terms of the IBM Public
   6  * License.  For details, see the LICENSE file in the top-level source
   7  * directory or online at http://www.openafs.org/dl/license10.html
   8  */
   9
  10 /*
  11  * Linux module support routines.
  12  *
  13  */
  14 #include <afsconfig.h>
  15 #include "afs/param.h"
  16
  17 RCSID
  18     ("$Header$");
  19
  20 #include "afs/sysincludes.h"
  21 #include "afsincludes.h"
  22 #include "h/unistd.h"           /* For syscall numbers. */
  23 #include "h/mm.h"
  24
  25 #ifdef AFS_AMD64_LINUX20_ENV
  26 #include "../asm/ia32_unistd.h"
  27 #endif
  28
  29 #include <linux/module.h>
  30 #include <linux/slab.h>
  31 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
  32 #include <linux/init.h>
  33 #include <linux/sched.h>
  34 #endif
  35 #if !defined(EXPORTED_SYS_CALL_TABLE) && defined(HAVE_KERNEL_LINUX_SYSCALL_H)
  36 #include <linux/syscall.h>
  37 #endif
  38
  39 #ifdef AFS_SPARC64_LINUX24_ENV
  40 #define __NR_setgroups32      82        /* This number is not exported for some bizarre reason. */
  41 #endif
  42
  43 asmlinkage int (*sys_settimeofdayp) (struct timeval * tv,
  44                                      struct timezone * tz);
  45 asmlinkage long (*sys_setgroupsp) (int gidsetsize, gid_t * grouplist);
  46
  47 #ifdef EXPORTED_SYS_CALL_TABLE
  48 #ifdef AFS_SPARC64_LINUX20_ENV
  49 extern unsigned int sys_call_table[];   /* changed to uint because SPARC64 has syscaltable of 32bit items */
  50 #else
  51 extern void *sys_call_table[];  /* safer for other linuces */
  52 #endif
  53 #else /* EXPORTED_SYS_CALL_TABLE */
  54 #ifdef AFS_SPARC64_LINUX20_ENV
  55 static unsigned int *sys_call_table;    /* changed to uint because SPARC64 has syscaltable of 32bit items */
  56 #else
  57 static void **sys_call_table;   /* safer for other linuces */
  58 #endif
  59 #endif
  60 extern struct file_system_type afs_file_system;
  61
  62 static long get_page_offset(void);
  63
  64 #if defined(AFS_LINUX24_ENV)
  65 DECLARE_MUTEX(afs_global_lock);
  66 #else
  67 struct semaphore afs_global_lock = MUTEX;
  68 #endif
  69 int afs_global_owner = 0;
  70 unsigned long afs_linux_page_offset = 0;        /* contains the PAGE_OFFSET value */
  71
  72 /* Since sys_ni_syscall is not exported, I need to cache it in order to restore
  73  * it.
  74  */
  75 #ifdef AFS_SPARC64_LINUX20_ENV
  76 static unsigned int afs_ni_syscall = 0;
  77 #else
  78 static void *afs_ni_syscall = 0;
  79 #endif
  80
  81 #ifdef AFS_AMD64_LINUX20_ENV
  82 #ifdef EXPORTED_IA32_SYS_CALL_TABLE
  83 extern void *ia32_sys_call_table[];
  84 #else
  85 static void **ia32_sys_call_table;
  86 #endif
  87
  88 static void *ia32_ni_syscall = 0;
  89 asmlinkage long (*sys32_setgroupsp) (int gidsetsize, u16 * grouplist);
  90 #if defined(__NR_ia32_setgroups32)
  91 asmlinkage long (*sys32_setgroups32p) (int gidsetsize, gid_t * grouplist);
  92 #endif /* __NR_ia32_setgroups32 */
  93 #endif /* AFS_AMD64_LINUX20_ENV */
  94
  95 #ifdef AFS_SPARC64_LINUX20_ENV
  96 static unsigned int afs_ni_syscall32 = 0;
  97 asmlinkage int (*sys32_setgroupsp) (int gidsetsize,
  98                                     __kernel_gid_t32 * grouplist);
  99 #if defined(__NR_setgroups32)
 100 asmlinkage int (*sys32_setgroups32p) (int gidsetsize,
 101                                       __kernel_gid_t32 * grouplist);
 102 #endif /* __NR_setgroups32 */
 103 #ifdef EXPORTED_SYS_CALL_TABLE
 104 extern unsigned int sys_call_table32[];
 105 #else /* EXPORTED_SYS_CALL_TABLE */
 106 static unsigned int *sys_call_table32;
 107 #endif /* EXPORTED_SYS_CALL_TABLE */
 108
 109 asmlinkage int
 110 afs_syscall32(long syscall, long parm1, long parm2, long parm3, long parm4,
 111               long parm5)
 112 {
 113     __asm__ __volatile__("srl %o4, 0, %o4\n\t" "mov %o7, %i7\n\t"
 114                          "call afs_syscall\n\t" "srl %o5, 0, %o5\n\t"
 115                          "ret\n\t" "nop");
 116 }
 117 #endif /* AFS_SPARC64_LINUX20_ENV */
 118
 119 #ifdef AFS_IA64_LINUX20_ENV
 120
 121 asmlinkage long
 122 afs_syscall_stub(int r0, int r1, long r2, long r3, long r4, long gp)
 123 {
 124     __asm__ __volatile__("alloc r42 = ar.pfs, 8, 3, 6, 0\n\t" "mov r41 = b0\n\t"        /* save rp */
 125                          "mov out0 = in0\n\t" "mov out1 = in1\n\t" "mov out2 = in2\n\t" "mov out3 = in3\n\t" "mov out4 = in4\n\t" "mov out5 = gp\n\t"   /* save gp */
 126                          ";;\n" ".L1:    mov r3 = ip\n\t" ";;\n\t" "addl r15=.fptr_afs_syscall-.L1,r3\n\t" ";;\n\t" "ld8 r15=[r15]\n\t" ";;\n\t" "ld8 r16=[r15],8\n\t" ";;\n\t" "ld8 gp=[r15]\n\t" "mov b6=r16\n\t" "br.call.sptk.many b0 = b6\n\t" ";;\n\t" "mov ar.pfs = r42\n\t" "mov b0 = r41\n\t" "mov gp = r48\n\t"       /* restore gp */
 127                          "br.ret.sptk.many b0\n" ".fptr_afs_syscall:\n\t"
 128                          "data8 @fptr(afs_syscall)");
 129 }
 130
 131 asmlinkage long
 132 afs_xsetgroups_stub(int r0, int r1, long r2, long r3, long r4, long gp)
 133 {
 134     __asm__ __volatile__("alloc r42 = ar.pfs, 8, 3, 6, 0\n\t" "mov r41 = b0\n\t"        /* save rp */
 135                          "mov out0 = in0\n\t" "mov out1 = in1\n\t" "mov out2 = in2\n\t" "mov out3 = in3\n\t" "mov out4 = in4\n\t" "mov out5 = gp\n\t"   /* save gp */
 136                          ";;\n" ".L2:    mov r3 = ip\n\t" ";;\n\t" "addl r15=.fptr_afs_xsetgroups - .L2,r3\n\t" ";;\n\t" "ld8 r15=[r15]\n\t" ";;\n\t" "ld8 r16=[r15],8\n\t" ";;\n\t" "ld8 gp=[r15]\n\t" "mov b6=r16\n\t" "br.call.sptk.many b0 = b6\n\t" ";;\n\t" "mov ar.pfs = r42\n\t" "mov b0 = r41\n\t" "mov gp = r48\n\t"  /* restore gp */
 137                          "br.ret.sptk.many b0\n" ".fptr_afs_xsetgroups:\n\t"
 138                          "data8 @fptr(afs_xsetgroups)");
 139 }
 140
 141 struct fptr {
 142     void *ip;
 143     unsigned long gp;
 144 };
 145
 146 #endif /* AFS_IA64_LINUX20_ENV */
 147
 148 #ifdef AFS_LINUX24_ENV
 149 asmlinkage int (*sys_setgroups32p) (int gidsetsize,
 150                                     __kernel_gid32_t * grouplist);
 151 #endif /* AFS_LINUX24_ENV */
 152
 153 #ifdef AFS_SPARC64_LINUX20_ENV
 154 #define POINTER2SYSCALL (unsigned int)(unsigned long)
 155 #define SYSCALL2POINTER (void *)(long)
 156 #else
 157 #define POINTER2SYSCALL (void *)
 158 #define SYSCALL2POINTER (void *)
 159 #endif
 160
 161 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
 162 int __init
 163 afs_init(void)
 164 #else
 165 int
 166 init_module(void)
 167 #endif
 168 {
 169 #if defined(AFS_IA64_LINUX20_ENV)
 170     unsigned long kernel_gp = 0;
 171     static struct fptr sys_settimeofday, sys_setgroups;
 172 #endif
 173     extern int afs_syscall();
 174     extern long afs_xsetgroups();
 175 #if defined(__NR_setgroups32)
 176     extern int afs_xsetgroups32();
 177 #endif /* __NR_setgroups32 */
 178 #if defined(AFS_SPARC64_LINUX20_ENV) || defined (AFS_AMD64_LINUX20_ENV)
 179     extern int afs32_xsetgroups();
 180 #if (defined(__NR_setgroups32) && defined(AFS_SPARC64_LINUX20_ENV))
 181     extern int afs32_xsetgroups32();
 182 #endif
 183 #if (defined(__NR_ia32_setgroups32) && defined(AFS_AMD64_LINUX20_ENV))
 184     extern int afs32_xsetgroups32();
 185 #endif
 186 #endif /* AFS_SPARC64_LINUX20_ENV || AFS_AMD64_LINUX20_ENV */
 187
 188 #if !defined(EXPORTED_SYS_CALL_TABLE) || (defined(AFS_AMD64_LINUX20_ENV) && !defined(EXPORTED_IA32_SYS_CALL_TABLE))
 189     unsigned long *ptr;
 190     unsigned long offset=0;
 191     unsigned long datalen=0;
 192     int ret;
 193     unsigned long token=0;
 194     char *mod_name;
 195     unsigned long mod_start=0;
 196     unsigned long mod_end=0;
 197     char *sec_name;
 198     unsigned long sec_start=0;
 199     unsigned long sec_end=0;
 200     char *sym_name;
 201     unsigned long sym_start=0;
 202     unsigned long sym_end=0;
 203 #endif /* EXPORTED_SYS_CALL_TABLE */
 204
 205     RWLOCK_INIT(&afs_xosi, "afs_xosi");
 206
 207     /* obtain PAGE_OFFSET value */
 208     afs_linux_page_offset = get_page_offset();
 209
 210 #ifndef AFS_S390_LINUX22_ENV
 211     if (afs_linux_page_offset == 0) {
 212         /* couldn't obtain page offset so can't continue */
 213         printf("afs: Unable to obtain PAGE_OFFSET. Exiting..");
 214         return -EIO;
 215     }
 216 #endif
 217 #ifndef EXPORTED_SYS_CALL_TABLE
 218     sys_call_table = 0;
 219
 220 #ifdef EXPORTED_KALLSYMS_SYMBOL
 221     ret = 1;
 222     token = 0;
 223     while (ret) {
 224         sym_start = 0;
 225         ret =
 226             kallsyms_symbol_to_address("sys_call_table", &token, &mod_name,
 227                                        &mod_start, &mod_end, &sec_name,
 228                                        &sec_start, &sec_end, &sym_name,
 229                                        &sym_start, &sym_end);
 230         if (ret && !strcmp(mod_name, "kernel"))
 231             break;
 232     }
 233     if (ret && sym_start) {
 234         sys_call_table = sym_start;
 235     }
 236 #else
 237 #ifdef EXPORTED_KALLSYMS_ADDRESS
 238     ret =
 239         kallsyms_address_to_symbol((unsigned long)&init_mm, &mod_name,
 240                                    &mod_start, &mod_end, &sec_name,
 241                                    &sec_start, &sec_end, &sym_name,
 242                                    &sym_start, &sym_end);
 243     ptr = (unsigned long *)sec_start;
 244     datalen = (sec_end - sec_start) / sizeof(unsigned long);
 245 #else
 246 #if defined(AFS_IA64_LINUX20_ENV)
 247     ptr = (unsigned long *)(&sys_close - 0x180000);
 248     datalen = 0x180000 / sizeof(ptr);
 249 #else
 250 #if defined(AFS_AMD64_LINUX20_ENV)
 251     ptr = (unsigned long *)&init_mm;
 252     datalen = 0x360000 / sizeof(ptr);
 253 #else
 254     ptr = (unsigned long *)&init_mm;
 255     datalen = 16384;
 256 #endif
 257 #endif
 258 #endif
 259     for (offset = 0; offset < datalen; ptr++, offset++) {
 260 #if defined(AFS_IA64_LINUX20_ENV)
 261         unsigned long close_ip =
 262             (unsigned long)((struct fptr *)&sys_close)->ip;
 263         unsigned long chdir_ip =
 264             (unsigned long)((struct fptr *)&sys_chdir)->ip;
 265         unsigned long write_ip =
 266             (unsigned long)((struct fptr *)&sys_write)->ip;
 267         if (ptr[0] == close_ip && ptr[__NR_chdir - __NR_close] == chdir_ip
 268             && ptr[__NR_write - __NR_close] == write_ip) {
 269             sys_call_table = (void *)&(ptr[-1 * (__NR_close - 1024)]);
 270             break;
 271         }
 272 #else
 273 #if defined(EXPORTED_SYS_WAIT4) && defined(EXPORTED_SYS_CLOSE)
 274         if (ptr[0] == (unsigned long)&sys_close
 275             && ptr[__NR_wait4 - __NR_close] == (unsigned long)&sys_wait4) {
 276             sys_call_table = ptr - __NR_close;
 277             break;
 278         }
 279 #else
 280 #if defined(EXPORTED_SYS_CHDIR) && defined(EXPORTED_SYS_CLOSE)
 281         if (ptr[0] == (unsigned long)&sys_close
 282             && ptr[__NR_chdir - __NR_close] == (unsigned long)&sys_chdir) {
 283             sys_call_table = ptr - __NR_close;
 284             break;
 285         }
 286 #else
 287         if (ptr[0] == (unsigned long)&sys_exit
 288             && ptr[__NR_open - __NR_exit] == (unsigned long)&sys_open) {
 289             sys_call_table = ptr - __NR_exit;
 290             break;
 291         }
 292 #endif
 293 #endif
 294 #endif
 295     }
 296 #ifdef EXPORTED_KALLSYMS_ADDRESS
 297     ret =
 298         kallsyms_address_to_symbol((unsigned long)sys_call_table, &mod_name,
 299                                    &mod_start, &mod_end, &sec_name,
 300                                    &sec_start, &sec_end, &sym_name,
 301                                    &sym_start, &sym_end);
 302     if (ret && strcmp(sym_name, "sys_call_table"))
 303         sys_call_table = 0;
 304 #endif
 305 #endif
 306     if (!sys_call_table) {
 307         printf("Failed to find address of sys_call_table\n");
 308         return -EIO;
 309     }
 310     printf("Found sys_call_table at %x\n", sys_call_table);
 311 # ifdef AFS_SPARC64_LINUX20_ENV
 312     error cant support this yet.
 313 #endif
 314 #endif                          /* EXPORTED_SYS_CALL_TABLE */
 315 #ifdef AFS_AMD64_LINUX20_ENV
 316 #ifndef EXPORTED_IA32_SYS_CALL_TABLE
 317       ia32_sys_call_table = 0;
 318 #ifdef EXPORTED_KALLSYMS_SYMBOL
 319     ret = 1;
 320     token = 0;
 321     while (ret) {
 322         sym_start = 0;
 323         ret =
 324             kallsyms_symbol_to_address("ia32_sys_call_table", &token,
 325                                        &mod_name, &mod_start, &mod_end,
 326                                        &sec_name, &sec_start, &sec_end,
 327                                        &sym_name, &sym_start, &sym_end);
 328         if (ret && !strcmp(mod_name, "kernel"))
 329             break;
 330     }
 331     if (ret && sym_start) {
 332         ia32_sys_call_table = sym_start;
 333     }
 334 #else /* EXPORTED_KALLSYMS_SYMBOL */
 335 #ifdef EXPORTED_KALLSYMS_ADDRESS
 336     ret =
 337         kallsyms_address_to_symbol((unsigned long)&interruptible_sleep_on,
 338                                    &mod_name, &mod_start, &mod_end, &sec_name,
 339                                    &sec_start, &sec_end, &sym_name,
 340                                    &sym_start, &sym_end);
 341     ptr = (unsigned long *)sec_start;
 342     datalen = (sec_end - sec_start) / sizeof(unsigned long);
 343 #else /* EXPORTED_KALLSYMS_ADDRESS */
 344 #if defined(AFS_AMD64_LINUX20_ENV)
 345     ptr = (unsigned long *)&interruptible_sleep_on;
 346     datalen = 0x180000 / sizeof(ptr);
 347 #else /* AFS_AMD64_LINUX20_ENV */
 348     ptr = (unsigned long *)&interruptible_sleep_on;
 349     datalen = 16384;
 350 #endif /* AFS_AMD64_LINUX20_ENV */
 351 #endif /* EXPORTED_KALLSYMS_ADDRESS */
 352     for (offset = 0; offset < datalen; ptr++, offset++) {
 353         if (ptr[0] == (unsigned long)&sys_exit
 354             && ptr[__NR_ia32_open - __NR_ia32_exit] ==
 355             (unsigned long)&sys_open) {
 356             ia32_sys_call_table = ptr - __NR_ia32_exit;
 357             break;
 358         }
 359     }
 360 #ifdef EXPORTED_KALLSYMS_ADDRESS
 361     ret =
 362         kallsyms_address_to_symbol((unsigned long)ia32_sys_call_table,
 363                                    &mod_name, &mod_start, &mod_end, &sec_name,
 364                                    &sec_start, &sec_end, &sym_name,
 365                                    &sym_start, &sym_end);
 366     if (ret && strcmp(sym_name, "ia32_sys_call_table"))
 367         ia32_sys_call_table = 0;
 368 #endif /* EXPORTED_KALLSYMS_ADDRESS */
 369 #endif /* EXPORTED_KALLSYMS_SYMBOL */
 370     if (!ia32_sys_call_table) {
 371         printf("Warning: Failed to find address of ia32_sys_call_table\n");
 372     } else {
 373         printf("Found ia32_sys_call_table at %x\n", ia32_sys_call_table);
 374     }
 375 #else
 376     printf("Found ia32_sys_call_table at %x\n", ia32_sys_call_table);
 377 #endif /* IA32_SYS_CALL_TABLE */
 378 #endif
 379
 380     /* Initialize pointers to kernel syscalls. */
 381 #if defined(AFS_IA64_LINUX20_ENV)
 382     kernel_gp = ((struct fptr *)printk)->gp;
 383
 384     sys_settimeofdayp = (void *)&sys_settimeofday;
 385
 386     ((struct fptr *)sys_settimeofdayp)->ip =
 387         SYSCALL2POINTER sys_call_table[__NR_settimeofday - 1024];
 388     ((struct fptr *)sys_settimeofdayp)->gp = kernel_gp;
 389
 390 #else /* !AFS_IA64_LINUX20_ENV */
 391     sys_settimeofdayp = SYSCALL2POINTER sys_call_table[__NR_settimeofday];
 392 #endif /* AFS_IA64_LINUX20_ENV */
 393
 394     /* setup AFS entry point. */
 395     if (
 396 #if defined(AFS_IA64_LINUX20_ENV)
 397            SYSCALL2POINTER sys_call_table[__NR_afs_syscall - 1024]
 398 #else
 399            SYSCALL2POINTER sys_call_table[__NR_afs_syscall]
 400 #endif
 401            == afs_syscall) {
 402         printf("AFS syscall entry point already in use!\n");
 403         return -EBUSY;
 404     }
 405 #if defined(AFS_IA64_LINUX20_ENV)
 406     afs_ni_syscall = sys_call_table[__NR_afs_syscall - 1024];
 407     sys_call_table[__NR_afs_syscall - 1024] =
 408         POINTER2SYSCALL((struct fptr *)afs_syscall_stub)->ip;
 409 #else /* AFS_IA64_LINUX20_ENV */
 410     afs_ni_syscall = sys_call_table[__NR_afs_syscall];
 411     sys_call_table[__NR_afs_syscall] = POINTER2SYSCALL afs_syscall;
 412 # ifdef AFS_SPARC64_LINUX20_ENV
 413     afs_ni_syscall32 = sys_call_table32[__NR_afs_syscall];
 414     sys_call_table32[__NR_afs_syscall] = POINTER2SYSCALL afs_syscall32;
 415 # endif
 416 #endif /* AFS_IA64_LINUX20_ENV */
 417 #ifdef AFS_AMD64_LINUX20_ENV
 418     if (ia32_sys_call_table) {
 419         ia32_ni_syscall = ia32_sys_call_table[__NR_ia32_afs_syscall];
 420         ia32_sys_call_table[__NR_ia32_afs_syscall] =
 421             POINTER2SYSCALL afs_syscall;
 422     }
 423 #endif /* AFS_S390_LINUX22_ENV */
 424
 425     osi_Init();
 426     register_filesystem(&afs_file_system);
 427
 428     /* Intercept setgroups calls */
 429 #if defined(AFS_IA64_LINUX20_ENV)
 430     sys_setgroupsp = (void *)&sys_setgroups;
 431
 432     ((struct fptr *)sys_setgroupsp)->ip =
 433         SYSCALL2POINTER sys_call_table[__NR_setgroups - 1024];
 434     ((struct fptr *)sys_setgroupsp)->gp = kernel_gp;
 435
 436     sys_call_table[__NR_setgroups - 1024] =
 437         POINTER2SYSCALL((struct fptr *)afs_xsetgroups_stub)->ip;
 438 #else /* AFS_IA64_LINUX20_ENV */
 439     sys_setgroupsp = SYSCALL2POINTER sys_call_table[__NR_setgroups];
 440     sys_call_table[__NR_setgroups] = POINTER2SYSCALL afs_xsetgroups;
 441 #ifdef AFS_SPARC64_LINUX20_ENV
 442     sys32_setgroupsp = SYSCALL2POINTER sys_call_table32[__NR_setgroups];
 443     sys_call_table32[__NR_setgroups] = POINTER2SYSCALL afs32_xsetgroups;
 444 #endif /* AFS_SPARC64_LINUX20_ENV */
 445 #if defined(__NR_setgroups32)
 446     sys_setgroups32p = SYSCALL2POINTER sys_call_table[__NR_setgroups32];
 447     sys_call_table[__NR_setgroups32] = POINTER2SYSCALL afs_xsetgroups32;
 448 #ifdef AFS_SPARC64_LINUX20_ENV
 449     sys32_setgroups32p = SYSCALL2POINTER sys_call_table32[__NR_setgroups32];
 450     sys_call_table32[__NR_setgroups32] = POINTER2SYSCALL afs32_xsetgroups32;
 451 #endif /* AFS_SPARC64_LINUX20_ENV */
 452 #endif /* __NR_setgroups32 */
 453 #ifdef AFS_AMD64_LINUX20_ENV
 454     if (ia32_sys_call_table) {
 455         sys32_setgroupsp =
 456             SYSCALL2POINTER ia32_sys_call_table[__NR_ia32_setgroups];
 457         ia32_sys_call_table[__NR_ia32_setgroups] =
 458             POINTER2SYSCALL afs32_xsetgroups;
 459 #if defined(__NR_ia32_setgroups32)
 460         sys32_setgroups32p =
 461             SYSCALL2POINTER ia32_sys_call_table[__NR_ia32_setgroups32];
 462         ia32_sys_call_table[__NR_ia32_setgroups32] =
 463             POINTER2SYSCALL afs32_xsetgroups32;
 464 #endif /* __NR_ia32_setgroups32 */
 465     }
 466 #endif /* AFS_AMD64_LINUX20_ENV */
 467 #endif /* AFS_IA64_LINUX20_ENV */
 468
 469     osi_sysctl_init();
 470
 471     return 0;
 472 }
 473
 474 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
 475 void __exit
 476 afs_cleanup(void)
 477 #else
 478 void
 479 cleanup_module(void)
 480 #endif
 481 {
 482     struct task_struct *t;
 483
 484     osi_sysctl_clean();
 485
 486 #if defined(AFS_IA64_LINUX20_ENV)
 487     sys_call_table[__NR_setgroups - 1024] =
 488         POINTER2SYSCALL((struct fptr *)sys_setgroupsp)->ip;
 489     sys_call_table[__NR_afs_syscall - 1024] = afs_ni_syscall;
 490 #else /* AFS_IA64_LINUX20_ENV */
 491     sys_call_table[__NR_setgroups] = POINTER2SYSCALL sys_setgroupsp;
 492     sys_call_table[__NR_afs_syscall] = afs_ni_syscall;
 493 # ifdef AFS_SPARC64_LINUX20_ENV
 494     sys_call_table32[__NR_setgroups] = POINTER2SYSCALL sys32_setgroupsp;
 495     sys_call_table32[__NR_afs_syscall] = afs_ni_syscall32;
 496 # endif
 497 # if defined(__NR_setgroups32)
 498     sys_call_table[__NR_setgroups32] = POINTER2SYSCALL sys_setgroups32p;
 499 # ifdef AFS_SPARC64_LINUX20_ENV
 500     sys_call_table32[__NR_setgroups32] = POINTER2SYSCALL sys32_setgroups32p;
 501 # endif
 502 # endif
 503 #endif /* AFS_IA64_LINUX20_ENV */
 504 #ifdef AFS_AMD64_LINUX20_ENV
 505     if (ia32_sys_call_table) {
 506         ia32_sys_call_table[__NR_ia32_setgroups] =
 507             POINTER2SYSCALL sys32_setgroupsp;
 508         ia32_sys_call_table[__NR_ia32_afs_syscall] =
 509             POINTER2SYSCALL ia32_ni_syscall;
 510 # if defined(__NR_setgroups32)
 511         ia32_sys_call_table[__NR_ia32_setgroups32] =
 512             POINTER2SYSCALL sys32_setgroups32p;
 513 #endif
 514     }
 515 #endif
 516     unregister_filesystem(&afs_file_system);
 517
 518     osi_linux_free_inode_pages();       /* Invalidate all pages using AFS inodes. */
 519     osi_linux_free_afs_memory();
 520
 521     return;
 522 }
 523
 524 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
 525 module_init(afs_init);
 526 module_exit(afs_cleanup);
 527 #endif
 528
 529
 530 static long
 531 get_page_offset(void)
 532 {
 533 #if defined(AFS_PPC_LINUX22_ENV) || defined(AFS_SPARC64_LINUX20_ENV) || defined(AFS_SPARC_LINUX20_ENV) || defined(AFS_ALPHA_LINUX20_ENV) || defined(AFS_S390_LINUX22_ENV) || defined(AFS_IA64_LINUX20_ENV) || defined(AFS_PARISC_LINUX24_ENV) || defined(AFS_AMD64_LINUX20_ENV)
 534     return PAGE_OFFSET;
 535 #else
 536     struct task_struct *p, *q;
 537
 538     /* search backward thru the circular list */
 539 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
 540     read_lock(&tasklist_lock);
 541 #endif
 542     /* search backward thru the circular list */
 543 #ifdef DEFINED_PREV_TASK
 544     for (q = current; p = q; q = prev_task(p)) {
 545 #else
 546     for (p = current; p; p = p->prev_task) {
 547 #endif
 548         if (p->pid == 1) {
 549 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
 550             read_unlock(&tasklist_lock);
 551 #endif
 552             return p->addr_limit.seg;
 553         }
 554     }
 555
 556 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
 557     read_unlock(&tasklist_lock);
 558 #endif
 559     return 0;
 560 #endif
 561 }