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("$Header$");
  18
  19 #include "afs/sysincludes.h"
  20 #include "afsincludes.h"
  21 #include "h/unistd.h" /* For syscall numbers. */
  22 #include "h/mm.h"
  23
  24 #ifdef AFS_AMD64_LINUX20_ENV
  25 #include "../asm/ia32_unistd.h"
  26 #endif
  27
  28 #include <linux/module.h>
  29 #include <linux/slab.h>
  30 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
  31 #include <linux/init.h>
  32 #include <linux/sched.h>
  33 #endif
  34 #if !defined(EXPORTED_SYS_CALL_TABLE) && defined(HAVE_KERNEL_LINUX_SYSCALL_H)
  35 #include <linux/syscall.h>
  36 #endif
  37
  38 #ifdef AFS_SPARC64_LINUX24_ENV
  39 #define __NR_setgroups32      82 /* This number is not exported for some bizarre reason. */
  40 #endif
  41
  42 asmlinkage int (*sys_settimeofdayp)(struct timeval *tv, struct timezone *tz);
  43 asmlinkage long (*sys_setgroupsp)(int gidsetsize, gid_t *grouplist);
  44
  45 #ifdef EXPORTED_SYS_CALL_TABLE
  46 #ifdef AFS_SPARC64_LINUX20_ENV
  47 extern unsigned int sys_call_table[];  /* changed to uint because SPARC64 has syscaltable of 32bit items */
  48 #else
  49 extern void * sys_call_table[]; /* safer for other linuces */
  50 #endif
  51 #else /* EXPORTED_SYS_CALL_TABLE */
  52 #ifdef AFS_SPARC64_LINUX20_ENV
  53 static unsigned int *sys_call_table;  /* changed to uint because SPARC64 has syscaltable of 32bit items */
  54 #else
  55 static void ** sys_call_table; /* safer for other linuces */
  56 #endif
  57 #endif
  58 extern struct file_system_type afs_file_system;
  59
  60 static long get_page_offset(void);
  61
  62 #if defined(AFS_LINUX24_ENV)
  63 DECLARE_MUTEX(afs_global_lock);
  64 #else
  65 struct semaphore afs_global_lock = MUTEX;
  66 #endif
  67 int afs_global_owner = 0;
  68 unsigned long afs_linux_page_offset = 0; /* contains the PAGE_OFFSET value */
  69
  70 /* Since sys_ni_syscall is not exported, I need to cache it in order to restore
  71  * it.
  72  */
  73 #ifdef AFS_SPARC64_LINUX20_ENV
  74 static unsigned int afs_ni_syscall = 0;
  75 #else
  76 static void* afs_ni_syscall = 0;
  77 #endif
  78
  79 #ifdef AFS_AMD64_LINUX20_ENV
  80 #ifdef EXPORTED_IA32_SYS_CALL_TABLE
  81 extern void * ia32_sys_call_table[];
  82 #else
  83 static void **ia32_sys_call_table;
  84 #endif
  85
  86 static void *ia32_ni_syscall = 0;
  87 asmlinkage long (*sys32_setgroupsp)(int gidsetsize, old_gid_t *grouplist);
  88 #if defined(__NR_ia32_setgroups32)
  89 asmlinkage long (*sys32_setgroups32p)(int gidsetsize, gid_t *grouplist);
  90 #endif /* __NR_ia32_setgroups32 */
  91 #endif /* AFS_AMD64_LINUX20_ENV */
  92
  93 #ifdef AFS_SPARC64_LINUX20_ENV
  94 static unsigned int afs_ni_syscall32 = 0;
  95 asmlinkage int (*sys32_setgroupsp)(int gidsetsize, __kernel_gid_t32 *grouplist);
  96 #if defined(__NR_setgroups32)
  97 asmlinkage int (*sys32_setgroups32p)(int gidsetsize, __kernel_gid_t32 *grouplist);
  98 #endif /* __NR_setgroups32 */
  99 #ifdef EXPORTED_SYS_CALL_TABLE
 100 extern unsigned int sys_call_table32[];
 101 #else /* EXPORTED_SYS_CALL_TABLE */
 102 static unsigned int *sys_call_table32;
 103 #endif /* EXPORTED_SYS_CALL_TABLE */
 104
 105 asmlinkage int afs_syscall32(long syscall, long parm1, long parm2, long parm3,
 106                              long parm4, long parm5)
 107 {
 108 __asm__ __volatile__ ("srl %o4, 0, %o4\n\t"
 109                       "mov %o7, %i7\n\t"
 110                       "call afs_syscall\n\t"
 111                       "srl %o5, 0, %o5\n\t"
 112                       "ret\n\t"
 113                       "nop");
 114 }
 115 #endif /* AFS_SPARC64_LINUX20_ENV */
 116
 117 #ifdef AFS_IA64_LINUX20_ENV
 118
 119 asmlinkage long
 120 afs_syscall_stub(int r0, int r1, long r2, long r3, long r4, long gp)
 121 {
 122 __asm__ __volatile__ ("alloc r42 = ar.pfs, 8, 3, 6, 0\n\t"
 123                       "mov r41 = b0\n\t"                /* save rp */
 124                       "mov out0 = in0\n\t"
 125                       "mov out1 = in1\n\t"
 126                       "mov out2 = in2\n\t"
 127                       "mov out3 = in3\n\t"
 128                       "mov out4 = in4\n\t"
 129                       "mov out5 = gp\n\t"                       /* save gp */
 130                       ";;\n"
 131                       ".L1:    mov r3 = ip\n\t"
 132                       ";;\n\t"
 133                       "addl r15=.fptr_afs_syscall-.L1,r3\n\t"
 134                       ";;\n\t"
 135                       "ld8 r15=[r15]\n\t"
 136                       ";;\n\t"
 137                       "ld8 r16=[r15],8\n\t"
 138                       ";;\n\t"
 139                       "ld8 gp=[r15]\n\t"
 140                       "mov b6=r16\n\t"
 141                       "br.call.sptk.many b0 = b6\n\t"
 142                       ";;\n\t"
 143                       "mov ar.pfs = r42\n\t"
 144                       "mov b0 = r41\n\t"
 145                       "mov gp = r48\n\t"                /* restore gp */
 146                       "br.ret.sptk.many b0\n"
 147                       ".fptr_afs_syscall:\n\t"
 148                       "data8 @fptr(afs_syscall)");
 149 }
 150
 151 asmlinkage long
 152 afs_xsetgroups_stub(int r0, int r1, long r2, long r3, long r4, long gp)
 153 {
 154 __asm__ __volatile__ ("alloc r42 = ar.pfs, 8, 3, 6, 0\n\t"
 155                       "mov r41 = b0\n\t"                /* save rp */
 156                       "mov out0 = in0\n\t"
 157                       "mov out1 = in1\n\t"
 158                       "mov out2 = in2\n\t"
 159                       "mov out3 = in3\n\t"
 160                       "mov out4 = in4\n\t"
 161                       "mov out5 = gp\n\t"                       /* save gp */
 162                       ";;\n"
 163                       ".L2:    mov r3 = ip\n\t"
 164                       ";;\n\t"
 165                       "addl r15=.fptr_afs_xsetgroups - .L2,r3\n\t"
 166                       ";;\n\t"
 167                       "ld8 r15=[r15]\n\t"
 168                       ";;\n\t"
 169                       "ld8 r16=[r15],8\n\t"
 170                       ";;\n\t"
 171                       "ld8 gp=[r15]\n\t"
 172                       "mov b6=r16\n\t"
 173                       "br.call.sptk.many b0 = b6\n\t"
 174                       ";;\n\t"
 175                       "mov ar.pfs = r42\n\t"
 176                       "mov b0 = r41\n\t"
 177                       "mov gp = r48\n\t"                /* restore gp */
 178                       "br.ret.sptk.many b0\n"
 179                       ".fptr_afs_xsetgroups:\n\t"
 180                       "data8 @fptr(afs_xsetgroups)");
 181 }
 182
 183 struct fptr
 184 {
 185         void *ip;
 186         unsigned long gp;
 187 };
 188
 189 #endif /* AFS_IA64_LINUX20_ENV */
 190
 191 #ifdef AFS_LINUX24_ENV
 192 asmlinkage int (*sys_setgroups32p)(int gidsetsize, __kernel_gid32_t *grouplist);
 193 #endif /* AFS_LINUX24_ENV */
 194
 195 #ifdef AFS_SPARC64_LINUX20_ENV
 196 #define POINTER2SYSCALL (unsigned int)(unsigned long)
 197 #define SYSCALL2POINTER (void *)(long)
 198 #else
 199 #define POINTER2SYSCALL (void *)
 200 #define SYSCALL2POINTER (void *)
 201 #endif
 202
 203 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
 204 int __init afs_init(void)
 205 #else
 206 int init_module(void)
 207 #endif
 208 {
 209 #if defined(AFS_IA64_LINUX20_ENV)
 210     unsigned long kernel_gp;
 211     static struct fptr sys_settimeofday, sys_setgroups;
 212 #endif
 213     extern int afs_syscall();
 214     extern long afs_xsetgroups();
 215 #if defined(__NR_setgroups32)
 216     extern int afs_xsetgroups32();
 217 #endif /* __NR_setgroups32 */
 218 #if defined(AFS_SPARC64_LINUX20_ENV) || defined (AFS_AMD64_LINUX20_ENV)
 219     extern int afs32_xsetgroups();
 220 #if (defined(__NR_setgroups32) && defined(AFS_SPARC64_LINUX20_ENV))
 221     extern int afs32_xsetgroups32();
 222 #endif
 223 #if (defined(__NR_ia32_setgroups32) && defined(AFS_AMD64_LINUX20_ENV))
 224     extern int afs32_xsetgroups32();
 225 #endif
 226 #endif /* AFS_SPARC64_LINUX20_ENV || AFS_AMD64_LINUX20_ENV */
 227
 228 #if !defined(EXPORTED_SYS_CALL_TABLE) || (defined(AFS_AMD64_LINUX20_ENV) && !defined(EXPORTED_IA32_SYS_CALL_TABLE))
 229     unsigned long *ptr;
 230     unsigned long offset;
 231     unsigned long datalen;
 232     int ret;
 233     unsigned long token;
 234     char      *mod_name;
 235     unsigned long    mod_start;
 236     unsigned long    mod_end;
 237     char      *sec_name;
 238     unsigned long    sec_start;
 239     unsigned long    sec_end;
 240     char      *sym_name;
 241     unsigned long    sym_start;
 242     unsigned long    sym_end;
 243 #endif /* EXPORTED_SYS_CALL_TABLE */
 244
 245     RWLOCK_INIT(&afs_xosi, "afs_xosi");
 246
 247     /* obtain PAGE_OFFSET value */
 248     afs_linux_page_offset = get_page_offset();
 249
 250 #ifndef AFS_S390_LINUX22_ENV
 251     if (afs_linux_page_offset == 0) {
 252         /* couldn't obtain page offset so can't continue */
 253         printf("afs: Unable to obtain PAGE_OFFSET. Exiting..");
 254         return -EIO;
 255     }
 256 #endif
 257 #ifndef EXPORTED_SYS_CALL_TABLE
 258     sys_call_table=0;
 259
 260 #ifdef EXPORTED_KALLSYMS_SYMBOL
 261     ret=1;
 262     token=0;
 263     while (ret) {
 264       sym_start=0;
 265       ret=kallsyms_symbol_to_address("sys_call_table", &token, &mod_name,
 266                                      &mod_start, &mod_end, &sec_name, &sec_start, &sec_end,
 267                                      &sym_name, &sym_start, &sym_end);
 268       if (ret && !strcmp(mod_name, "kernel"))
 269         break;
 270     }
 271     if (ret && sym_start) {
 272       sys_call_table=sym_start;
 273     }
 274 #else
 275 #ifdef EXPORTED_KALLSYMS_ADDRESS
 276     ret=kallsyms_address_to_symbol((unsigned long)&init_mm, &mod_name,
 277                                    &mod_start, &mod_end, &sec_name, &sec_start, &sec_end,
 278                                    &sym_name, &sym_start, &sym_end);
 279     ptr=(unsigned long *)sec_start;
 280     datalen=(sec_end-sec_start)/sizeof(unsigned long);
 281 #else
 282 #if defined(AFS_IA64_LINUX20_ENV)
 283     ptr = (unsigned long *) (&sys_close - 0x180000);
 284     datalen=0x180000/sizeof(ptr);
 285 #else
 286 #if defined(AFS_AMD64_LINUX20_ENV)
 287     ptr=(unsigned long *)&init_mm;
 288     datalen=0x180000/sizeof(ptr);
 289 #else
 290     ptr=(unsigned long *)&init_mm;
 291     datalen=16384;
 292 #endif
 293 #endif
 294 #endif
 295     for (offset=0;offset <datalen;ptr++,offset++) {
 296 #if defined(AFS_IA64_LINUX20_ENV)
 297         unsigned long close_ip=(unsigned long) ((struct fptr *)&sys_close)->ip;
 298         unsigned long chdir_ip=(unsigned long) ((struct fptr *)&sys_chdir)->ip;
 299         unsigned long write_ip=(unsigned long) ((struct fptr *)&sys_write)->ip;
 300         if (ptr[0] == close_ip &&
 301             ptr[__NR_chdir - __NR_close] == chdir_ip &&
 302             ptr[__NR_write - __NR_close] == write_ip) {
 303             sys_call_table=(void *) &(ptr[ -1 * (__NR_close-1024)]);
 304             break;
 305         }
 306 #else
 307 #if defined(EXPORTED_SYS_WAIT4) && defined(EXPORTED_SYS_CLOSE)
 308         if (ptr[0] == (unsigned long)&sys_close &&
 309             ptr[__NR_wait4 - __NR_close] == (unsigned long)&sys_wait4) {
 310             sys_call_table=ptr - __NR_close;
 311             break;
 312         }
 313 #else
 314 #if defined(EXPORTED_SYS_CHDIR) && defined(EXPORTED_SYS_CLOSE)
 315         if (ptr[0] == (unsigned long)&sys_close &&
 316             ptr[__NR_chdir - __NR_close] == (unsigned long)&sys_chdir) {
 317             sys_call_table=ptr - __NR_close;
 318             break;
 319         }
 320 #else
 321         if (ptr[0] == (unsigned long)&sys_exit &&
 322             ptr[__NR_open - __NR_exit] == (unsigned long)&sys_open) {
 323             sys_call_table=ptr - __NR_exit;
 324             break;
 325         }
 326 #endif
 327 #endif
 328 #endif
 329     }
 330 #ifdef EXPORTED_KALLSYMS_ADDRESS
 331     ret=kallsyms_address_to_symbol((unsigned long)sys_call_table, &mod_name,
 332                                    &mod_start, &mod_end, &sec_name, &sec_start, &sec_end,
 333                                    &sym_name, &sym_start, &sym_end);
 334     if (ret && strcmp(sym_name, "sys_call_table"))
 335       sys_call_table=0;
 336 #endif
 337 #endif
 338     if (!sys_call_table) {
 339       printf("Failed to find address of sys_call_table\n");
 340       return -EIO;
 341     }
 342     printf("Found sys_call_table at %x\n", sys_call_table);
 343 # ifdef AFS_SPARC64_LINUX20_ENV
 344     error cant support this yet.
 345 #endif
 346 #endif /* EXPORTED_SYS_CALL_TABLE */
 347
 348 #ifdef AFS_AMD64_LINUX20_ENV
 349 #ifndef EXPORTED_IA32_SYS_CALL_TABLE
 350     ia32_sys_call_table=0;
 351 #ifdef EXPORTED_KALLSYMS_SYMBOL
 352     ret=1;
 353     token=0;
 354     while (ret) {
 355         sym_start=0;
 356         ret=kallsyms_symbol_to_address("ia32_sys_call_table", &token,
 357                                        &mod_name, &mod_start, &mod_end,
 358                                        &sec_name, &sec_start, &sec_end,
 359                                        &sym_name, &sym_start, &sym_end);
 360         if (ret && !strcmp(mod_name, "kernel"))
 361                 break;
 362     }
 363     if (ret && sym_start) {
 364             ia32_sys_call_table=sym_start;
 365     }
 366 #else /* EXPORTED_KALLSYMS_SYMBOL */
 367 #ifdef EXPORTED_KALLSYMS_ADDRESS
 368     ret=kallsyms_address_to_symbol((unsigned long)&interruptible_sleep_on,
 369                                    &mod_name, &mod_start, &mod_end, &sec_name,
 370                                    &sec_start, &sec_end,
 371                                    &sym_name, &sym_start, &sym_end);
 372     ptr=(unsigned long *)sec_start;
 373     datalen=(sec_end-sec_start)/sizeof(unsigned long);
 374 #else /* EXPORTED_KALLSYMS_ADDRESS */
 375 #if defined(AFS_AMD64_LINUX20_ENV)
 376     ptr=(unsigned long *)&interruptible_sleep_on;
 377     datalen=0x180000/sizeof(ptr);
 378 #else /* AFS_AMD64_LINUX20_ENV */
 379     ptr=(unsigned long *)&interruptible_sleep_on;
 380     datalen=16384;
 381 #endif /* AFS_AMD64_LINUX20_ENV */
 382 #endif /* EXPORTED_KALLSYMS_ADDRESS */
 383     for (offset=0;offset <datalen;ptr++,offset++) {
 384         if (ptr[0] == (unsigned long)&sys_exit &&
 385             ptr[__NR_ia32_open - __NR_ia32_exit] == (unsigned long)&sys_open) {
 386                 ia32_sys_call_table=ptr - __NR_ia32_exit;
 387             break;
 388         }
 389     }
 390 #ifdef EXPORTED_KALLSYMS_ADDRESS
 391     ret=kallsyms_address_to_symbol((unsigned long)ia32_sys_call_table,
 392                                    &mod_name, &mod_start, &mod_end, &sec_name,
 393                                    &sec_start, &sec_end,
 394                                    &sym_name, &sym_start, &sym_end);
 395     if (ret && strcmp(sym_name, "ia32_sys_call_table"))
 396             ia32_sys_call_table=0;
 397 #endif /* EXPORTED_KALLSYMS_ADDRESS */
 398 #endif /* EXPORTED_KALLSYMS_SYMBOL */
 399     if (!ia32_sys_call_table) {
 400          printf("Warning: Failed to find address of ia32_sys_call_table\n");
 401     } else {
 402         printf("Found ia32_sys_call_table at %x\n", ia32_sys_call_table);
 403     }
 404 #else
 405     printf("Found ia32_sys_call_table at %x\n", ia32_sys_call_table);
 406 #endif /* IA32_SYS_CALL_TABLE */
 407 #endif
 408
 409     /* Initialize pointers to kernel syscalls. */
 410 #if defined(AFS_IA64_LINUX20_ENV)
 411     kernel_gp = ((struct fptr *)printk)->gp;
 412
 413     sys_settimeofdayp = (void *) &sys_settimeofday;
 414
 415     ((struct fptr *)sys_settimeofdayp)->ip =
 416                 SYSCALL2POINTER sys_call_table[__NR_settimeofday - 1024];
 417     ((struct fptr *)sys_settimeofdayp)->gp = kernel_gp;
 418
 419 #else /* !AFS_IA64_LINUX20_ENV */
 420     sys_settimeofdayp = SYSCALL2POINTER sys_call_table[__NR_settimeofday];
 421 #endif /* AFS_IA64_LINUX20_ENV */
 422
 423     /* setup AFS entry point. */
 424     if (
 425 #if defined(AFS_IA64_LINUX20_ENV)
 426         SYSCALL2POINTER sys_call_table[__NR_afs_syscall - 1024]
 427 #else
 428         SYSCALL2POINTER sys_call_table[__NR_afs_syscall]
 429 #endif
 430         == afs_syscall) {
 431         printf("AFS syscall entry point already in use!\n");
 432         return -EBUSY;
 433     }
 434
 435 #if defined(AFS_IA64_LINUX20_ENV)
 436     afs_ni_syscall = sys_call_table[__NR_afs_syscall - 1024];
 437     sys_call_table[__NR_afs_syscall - 1024] = POINTER2SYSCALL ((struct fptr *)afs_syscall_stub)->ip;
 438 #else /* AFS_IA64_LINUX20_ENV */
 439     afs_ni_syscall = sys_call_table[__NR_afs_syscall];
 440     sys_call_table[__NR_afs_syscall] = POINTER2SYSCALL afs_syscall;
 441 # ifdef AFS_SPARC64_LINUX20_ENV
 442     afs_ni_syscall32 = sys_call_table32[__NR_afs_syscall];
 443     sys_call_table32[__NR_afs_syscall] = POINTER2SYSCALL afs_syscall32;
 444 # endif
 445 #endif /* AFS_IA64_LINUX20_ENV */
 446 #ifdef AFS_AMD64_LINUX20_ENV
 447     if (ia32_sys_call_table) {
 448         ia32_ni_syscall = ia32_sys_call_table[__NR_ia32_afs_syscall];
 449         ia32_sys_call_table[__NR_ia32_afs_syscall] = POINTER2SYSCALL afs_syscall;
 450     }
 451 #endif /* AFS_S390_LINUX22_ENV */
 452
 453     osi_Init();
 454     register_filesystem(&afs_file_system);
 455
 456     /* Intercept setgroups calls */
 457 #if defined(AFS_IA64_LINUX20_ENV)
 458     sys_setgroupsp = (void *) &sys_setgroups;
 459
 460     ((struct fptr *)sys_setgroupsp)->ip =
 461                 SYSCALL2POINTER sys_call_table[__NR_setgroups - 1024];
 462     ((struct fptr *)sys_setgroupsp)->gp = kernel_gp;
 463
 464     sys_call_table[__NR_setgroups - 1024] = POINTER2SYSCALL ((struct fptr *)afs_xsetgroups_stub)->ip;
 465 #else /* AFS_IA64_LINUX20_ENV */
 466     sys_setgroupsp = SYSCALL2POINTER sys_call_table[__NR_setgroups];
 467     sys_call_table[__NR_setgroups] = POINTER2SYSCALL afs_xsetgroups;
 468 #ifdef AFS_SPARC64_LINUX20_ENV
 469     sys32_setgroupsp = SYSCALL2POINTER sys_call_table32[__NR_setgroups];
 470     sys_call_table32[__NR_setgroups] = POINTER2SYSCALL afs32_xsetgroups;
 471 #endif /* AFS_SPARC64_LINUX20_ENV */
 472 #if defined(__NR_setgroups32)
 473     sys_setgroups32p = SYSCALL2POINTER sys_call_table[__NR_setgroups32];
 474     sys_call_table[__NR_setgroups32] = POINTER2SYSCALL afs_xsetgroups32;
 475 #ifdef AFS_SPARC64_LINUX20_ENV
 476     sys32_setgroups32p = SYSCALL2POINTER sys_call_table32[__NR_setgroups32];
 477     sys_call_table32[__NR_setgroups32] = POINTER2SYSCALL afs32_xsetgroups32;
 478 #endif /* AFS_SPARC64_LINUX20_ENV */
 479 #endif /* __NR_setgroups32 */
 480 #ifdef AFS_AMD64_LINUX20_ENV
 481     if (ia32_sys_call_table) {
 482         sys32_setgroupsp =
 483             SYSCALL2POINTER ia32_sys_call_table[__NR_ia32_setgroups];
 484         ia32_sys_call_table[__NR_ia32_setgroups] =
 485             POINTER2SYSCALL afs32_xsetgroups;
 486 #if defined(__NR_ia32_setgroups32)
 487         sys32_setgroups32p =
 488             SYSCALL2POINTER ia32_sys_call_table[__NR_ia32_setgroups32];
 489         ia32_sys_call_table[__NR_ia32_setgroups32] =
 490             POINTER2SYSCALL afs32_xsetgroups32;
 491 #endif /* __NR_ia32_setgroups32 */
 492     }
 493 #endif /* AFS_AMD64_LINUX20_ENV */
 494 #endif /* AFS_IA64_LINUX20_ENV */
 495
 496     osi_sysctl_init();
 497
 498     return 0;
 499 }
 500
 501 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
 502 void __exit afs_cleanup(void)
 503 #else
 504 void cleanup_module(void)
 505 #endif
 506 {
 507     struct task_struct *t;
 508
 509     osi_sysctl_clean();
 510
 511 #if defined(AFS_IA64_LINUX20_ENV)
 512     sys_call_table[__NR_setgroups - 1024] = POINTER2SYSCALL ((struct fptr *) sys_setgroupsp)->ip;
 513     sys_call_table[__NR_afs_syscall - 1024] = afs_ni_syscall;
 514 #else /* AFS_IA64_LINUX20_ENV */
 515     sys_call_table[__NR_setgroups] = POINTER2SYSCALL sys_setgroupsp;
 516     sys_call_table[__NR_afs_syscall] = afs_ni_syscall;
 517 # ifdef AFS_SPARC64_LINUX20_ENV
 518     sys_call_table32[__NR_setgroups] = POINTER2SYSCALL sys32_setgroupsp;
 519     sys_call_table32[__NR_afs_syscall] = afs_ni_syscall32;
 520 # endif
 521 # if defined(__NR_setgroups32)
 522     sys_call_table[__NR_setgroups32] = POINTER2SYSCALL sys_setgroups32p;
 523 # ifdef AFS_SPARC64_LINUX20_ENV
 524     sys_call_table32[__NR_setgroups32] = POINTER2SYSCALL sys32_setgroups32p;
 525 # endif
 526 # endif
 527 #endif /* AFS_IA64_LINUX20_ENV */
 528 #ifdef AFS_AMD64_LINUX20_ENV
 529     if (ia32_sys_call_table) {
 530         ia32_sys_call_table[__NR_ia32_setgroups] =
 531             POINTER2SYSCALL sys32_setgroupsp;
 532         ia32_sys_call_table[__NR_ia32_afs_syscall] =
 533             POINTER2SYSCALL ia32_ni_syscall;
 534 # if defined(__NR_setgroups32)
 535         ia32_sys_call_table[__NR_ia32_setgroups32] =
 536             POINTER2SYSCALL sys32_setgroups32p;
 537 #endif
 538     }
 539 #endif
 540     unregister_filesystem(&afs_file_system);
 541
 542     osi_linux_free_inode_pages(); /* Invalidate all pages using AFS inodes. */
 543     osi_linux_free_afs_memory();
 544
 545     return;
 546 }
 547
 548 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
 549 module_init(afs_init);
 550 module_exit(afs_cleanup);
 551 #endif
 552
 553
 554 static long get_page_offset(void)
 555 {
 556 #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)
 557     return PAGE_OFFSET;
 558 #else
 559     struct task_struct *p, *q;
 560
 561     /* search backward thru the circular list */
 562 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
 563     read_lock(&tasklist_lock);
 564 #endif
 565     /* search backward thru the circular list */
 566 #ifdef DEFINED_PREV_TASK
 567     for(q = current; p = q; q = prev_task(p)) {
 568 #else
 569     for(p = current; p; p = p->prev_task) {
 570 #endif
 571             if (p->pid == 1) {
 572 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
 573                     read_unlock(&tasklist_lock);
 574 #endif
 575                     return p->addr_limit.seg;
 576             }
 577     }
 578
 579 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
 580     read_unlock(&tasklist_lock);
 581 #endif
 582   return 0;
 583 #endif
 584 }