arch/s390/kernel/compat_linux.c

   1 /*
   2  *  arch/s390x/kernel/linux32.c
   3  *
   4  *  S390 version
   5  *    Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
   7  *               Gerhard Tonn (ton@de.ibm.com)
   8  *               Thomas Spatzier (tspat@de.ibm.com)
   9  *
  10  *  Conversion between 31bit and 64bit native syscalls.
  11  *
  12  * Heavily inspired by the 32-bit Sparc compat code which is
  13  * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  14  * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
  15  *
  16  */
  17
  18
  19 #include <linux/kernel.h>
  20 #include <linux/sched.h>
  21 #include <linux/fs.h>
  22 #include <linux/mm.h>
  23 #include <linux/file.h>
  24 #include <linux/signal.h>
  25 #include <linux/resource.h>
  26 #include <linux/times.h>
  27 #include <linux/smp.h>
  28 #include <linux/sem.h>
  29 #include <linux/msg.h>
  30 #include <linux/shm.h>
  31 #include <linux/uio.h>
  32 #include <linux/quota.h>
  33 #include <linux/module.h>
  34 #include <linux/poll.h>
  35 #include <linux/personality.h>
  36 #include <linux/stat.h>
  37 #include <linux/filter.h>
  38 #include <linux/highmem.h>
  39 #include <linux/highuid.h>
  40 #include <linux/mman.h>
  41 #include <linux/ipv6.h>
  42 #include <linux/in.h>
  43 #include <linux/icmpv6.h>
  44 #include <linux/syscalls.h>
  45 #include <linux/sysctl.h>
  46 #include <linux/binfmts.h>
  47 #include <linux/capability.h>
  48 #include <linux/compat.h>
  49 #include <linux/vfs.h>
  50 #include <linux/ptrace.h>
  51 #include <linux/fadvise.h>
  52 #include <linux/ipc.h>
  53 #include <linux/slab.h>
  54
  55 #include <asm/types.h>
  56 #include <asm/uaccess.h>
  57
  58 #include <net/scm.h>
  59 #include <net/sock.h>
  60
  61 #include "compat_linux.h"
  62
  63 u32 psw32_user_bits = PSW32_MASK_DAT | PSW32_MASK_IO | PSW32_MASK_EXT |
  64                       PSW32_DEFAULT_KEY | PSW32_MASK_BASE | PSW32_MASK_MCHECK |
  65                       PSW32_MASK_PSTATE | PSW32_ASC_HOME;
  66
  67 /* For this source file, we want overflow handling. */
  68
  69 #undef high2lowuid
  70 #undef high2lowgid
  71 #undef low2highuid
  72 #undef low2highgid
  73 #undef SET_UID16
  74 #undef SET_GID16
  75 #undef NEW_TO_OLD_UID
  76 #undef NEW_TO_OLD_GID
  77 #undef SET_OLDSTAT_UID
  78 #undef SET_OLDSTAT_GID
  79 #undef SET_STAT_UID
  80 #undef SET_STAT_GID
  81
  82 #define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
  83 #define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
  84 #define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
  85 #define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
  86 #define SET_UID16(var, uid)     var = high2lowuid(uid)
  87 #define SET_GID16(var, gid)     var = high2lowgid(gid)
  88 #define NEW_TO_OLD_UID(uid)     high2lowuid(uid)
  89 #define NEW_TO_OLD_GID(gid)     high2lowgid(gid)
  90 #define SET_OLDSTAT_UID(stat, uid)      (stat).st_uid = high2lowuid(uid)
  91 #define SET_OLDSTAT_GID(stat, gid)      (stat).st_gid = high2lowgid(gid)
  92 #define SET_STAT_UID(stat, uid)         (stat).st_uid = high2lowuid(uid)
  93 #define SET_STAT_GID(stat, gid)         (stat).st_gid = high2lowgid(gid)
  94
  95 asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
  96 {
  97         return sys_chown(filename, low2highuid(user), low2highgid(group));
  98 }
  99
 100 asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
 101 {
 102         return sys_lchown(filename, low2highuid(user), low2highgid(group));
 103 }
 104
 105 asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
 106 {
 107         return sys_fchown(fd, low2highuid(user), low2highgid(group));
 108 }
 109
 110 asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
 111 {
 112         return sys_setregid(low2highgid(rgid), low2highgid(egid));
 113 }
 114
 115 asmlinkage long sys32_setgid16(u16 gid)
 116 {
 117         return sys_setgid((gid_t)gid);
 118 }
 119
 120 asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
 121 {
 122         return sys_setreuid(low2highuid(ruid), low2highuid(euid));
 123 }
 124
 125 asmlinkage long sys32_setuid16(u16 uid)
 126 {
 127         return sys_setuid((uid_t)uid);
 128 }
 129
 130 asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
 131 {
 132         return sys_setresuid(low2highuid(ruid), low2highuid(euid),
 133                 low2highuid(suid));
 134 }
 135
 136 asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid)
 137 {
 138         int retval;
 139
 140         if (!(retval = put_user(high2lowuid(current->cred->uid), ruid)) &&
 141             !(retval = put_user(high2lowuid(current->cred->euid), euid)))
 142                 retval = put_user(high2lowuid(current->cred->suid), suid);
 143
 144         return retval;
 145 }
 146
 147 asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
 148 {
 149         return sys_setresgid(low2highgid(rgid), low2highgid(egid),
 150                 low2highgid(sgid));
 151 }
 152
 153 asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid)
 154 {
 155         int retval;
 156
 157         if (!(retval = put_user(high2lowgid(current->cred->gid), rgid)) &&
 158             !(retval = put_user(high2lowgid(current->cred->egid), egid)))
 159                 retval = put_user(high2lowgid(current->cred->sgid), sgid);
 160
 161         return retval;
 162 }
 163
 164 asmlinkage long sys32_setfsuid16(u16 uid)
 165 {
 166         return sys_setfsuid((uid_t)uid);
 167 }
 168
 169 asmlinkage long sys32_setfsgid16(u16 gid)
 170 {
 171         return sys_setfsgid((gid_t)gid);
 172 }
 173
 174 static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
 175 {
 176         int i;
 177         u16 group;
 178
 179         for (i = 0; i < group_info->ngroups; i++) {
 180                 group = (u16)GROUP_AT(group_info, i);
 181                 if (put_user(group, grouplist+i))
 182                         return -EFAULT;
 183         }
 184
 185         return 0;
 186 }
 187
 188 static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
 189 {
 190         int i;
 191         u16 group;
 192
 193         for (i = 0; i < group_info->ngroups; i++) {
 194                 if (get_user(group, grouplist+i))
 195                         return  -EFAULT;
 196                 GROUP_AT(group_info, i) = (gid_t)group;
 197         }
 198
 199         return 0;
 200 }
 201
 202 asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
 203 {
 204         int i;
 205
 206         if (gidsetsize < 0)
 207                 return -EINVAL;
 208
 209         get_group_info(current->cred->group_info);
 210         i = current->cred->group_info->ngroups;
 211         if (gidsetsize) {
 212                 if (i > gidsetsize) {
 213                         i = -EINVAL;
 214                         goto out;
 215                 }
 216                 if (groups16_to_user(grouplist, current->cred->group_info)) {
 217                         i = -EFAULT;
 218                         goto out;
 219                 }
 220         }
 221 out:
 222         put_group_info(current->cred->group_info);
 223         return i;
 224 }
 225
 226 asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
 227 {
 228         struct group_info *group_info;
 229         int retval;
 230
 231         if (!capable(CAP_SETGID))
 232                 return -EPERM;
 233         if ((unsigned)gidsetsize > NGROUPS_MAX)
 234                 return -EINVAL;
 235
 236         group_info = groups_alloc(gidsetsize);
 237         if (!group_info)
 238                 return -ENOMEM;
 239         retval = groups16_from_user(group_info, grouplist);
 240         if (retval) {
 241                 put_group_info(group_info);
 242                 return retval;
 243         }
 244
 245         retval = set_current_groups(group_info);
 246         put_group_info(group_info);
 247
 248         return retval;
 249 }
 250
 251 asmlinkage long sys32_getuid16(void)
 252 {
 253         return high2lowuid(current->cred->uid);
 254 }
 255
 256 asmlinkage long sys32_geteuid16(void)
 257 {
 258         return high2lowuid(current->cred->euid);
 259 }
 260
 261 asmlinkage long sys32_getgid16(void)
 262 {
 263         return high2lowgid(current->cred->gid);
 264 }
 265
 266 asmlinkage long sys32_getegid16(void)
 267 {
 268         return high2lowgid(current->cred->egid);
 269 }
 270
 271 /*
 272  * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation.
 273  *
 274  * This is really horribly ugly.
 275  */
 276 #ifdef CONFIG_SYSVIPC
 277 asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr)
 278 {
 279         if (call >> 16)         /* hack for backward compatibility */
 280                 return -EINVAL;
 281
 282         call &= 0xffff;
 283
 284         switch (call) {
 285         case SEMTIMEDOP:
 286                 return compat_sys_semtimedop(first, compat_ptr(ptr),
 287                                              second, compat_ptr(third));
 288         case SEMOP:
 289                 /* struct sembuf is the same on 32 and 64bit :)) */
 290                 return sys_semtimedop(first, compat_ptr(ptr),
 291                                       second, NULL);
 292         case SEMGET:
 293                 return sys_semget(first, second, third);
 294         case SEMCTL:
 295                 return compat_sys_semctl(first, second, third,
 296                                          compat_ptr(ptr));
 297         case MSGSND:
 298                 return compat_sys_msgsnd(first, second, third,
 299                                          compat_ptr(ptr));
 300         case MSGRCV:
 301                 return compat_sys_msgrcv(first, second, 0, third,
 302                                          0, compat_ptr(ptr));
 303         case MSGGET:
 304                 return sys_msgget((key_t) first, second);
 305         case MSGCTL:
 306                 return compat_sys_msgctl(first, second, compat_ptr(ptr));
 307         case SHMAT:
 308                 return compat_sys_shmat(first, second, third,
 309                                         0, compat_ptr(ptr));
 310         case SHMDT:
 311                 return sys_shmdt(compat_ptr(ptr));
 312         case SHMGET:
 313                 return sys_shmget(first, (unsigned)second, third);
 314         case SHMCTL:
 315                 return compat_sys_shmctl(first, second, compat_ptr(ptr));
 316         }
 317
 318         return -ENOSYS;
 319 }
 320 #endif
 321
 322 asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
 323 {
 324         if ((int)high < 0)
 325                 return -EINVAL;
 326         else
 327                 return sys_truncate(path, (high << 32) | low);
 328 }
 329
 330 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
 331 {
 332         if ((int)high < 0)
 333                 return -EINVAL;
 334         else
 335                 return sys_ftruncate(fd, (high << 32) | low);
 336 }
 337
 338 asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
 339                                 struct compat_timespec __user *interval)
 340 {
 341         struct timespec t;
 342         int ret;
 343         mm_segment_t old_fs = get_fs ();
 344
 345         set_fs (KERNEL_DS);
 346         ret = sys_sched_rr_get_interval(pid,
 347                                         (struct timespec __force __user *) &t);
 348         set_fs (old_fs);
 349         if (put_compat_timespec(&t, interval))
 350                 return -EFAULT;
 351         return ret;
 352 }
 353
 354 asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
 355                         compat_sigset_t __user *oset, size_t sigsetsize)
 356 {
 357         sigset_t s;
 358         compat_sigset_t s32;
 359         int ret;
 360         mm_segment_t old_fs = get_fs();
 361
 362         if (set) {
 363                 if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
 364                         return -EFAULT;
 365                 s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
 366         }
 367         set_fs (KERNEL_DS);
 368         ret = sys_rt_sigprocmask(how,
 369                                  set ? (sigset_t __force __user *) &s : NULL,
 370                                  oset ? (sigset_t __force __user *) &s : NULL,
 371                                  sigsetsize);
 372         set_fs (old_fs);
 373         if (ret) return ret;
 374         if (oset) {
 375                 s32.sig[1] = (s.sig[0] >> 32);
 376                 s32.sig[0] = s.sig[0];
 377                 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
 378                         return -EFAULT;
 379         }
 380         return 0;
 381 }
 382
 383 asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
 384                                 size_t sigsetsize)
 385 {
 386         sigset_t s;
 387         compat_sigset_t s32;
 388         int ret;
 389         mm_segment_t old_fs = get_fs();
 390
 391         set_fs (KERNEL_DS);
 392         ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
 393         set_fs (old_fs);
 394         if (!ret) {
 395                 s32.sig[1] = (s.sig[0] >> 32);
 396                 s32.sig[0] = s.sig[0];
 397                 if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
 398                         return -EFAULT;
 399         }
 400         return ret;
 401 }
 402
 403 asmlinkage long
 404 sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
 405 {
 406         siginfo_t info;
 407         int ret;
 408         mm_segment_t old_fs = get_fs();
 409
 410         if (copy_siginfo_from_user32(&info, uinfo))
 411                 return -EFAULT;
 412         set_fs (KERNEL_DS);
 413         ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);
 414         set_fs (old_fs);
 415         return ret;
 416 }
 417
 418 /*
 419  * sys32_execve() executes a new program after the asm stub has set
 420  * things up for us.  This should basically do what I want it to.
 421  */
 422 asmlinkage long sys32_execve(const char __user *name, compat_uptr_t __user *argv,
 423                              compat_uptr_t __user *envp)
 424 {
 425         struct pt_regs *regs = task_pt_regs(current);
 426         char *filename;
 427         long rc;
 428
 429         filename = getname(name);
 430         rc = PTR_ERR(filename);
 431         if (IS_ERR(filename))
 432                 return rc;
 433         rc = compat_do_execve(filename, argv, envp, regs);
 434         if (rc)
 435                 goto out;
 436         current->thread.fp_regs.fpc=0;
 437         asm volatile("sfpc %0,0" : : "d" (0));
 438         rc = regs->gprs[2];
 439 out:
 440         putname(filename);
 441         return rc;
 442 }
 443
 444 asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
 445                                 size_t count, u32 poshi, u32 poslo)
 446 {
 447         if ((compat_ssize_t) count < 0)
 448                 return -EINVAL;
 449         return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
 450 }
 451
 452 asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
 453                                 size_t count, u32 poshi, u32 poslo)
 454 {
 455         if ((compat_ssize_t) count < 0)
 456                 return -EINVAL;
 457         return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
 458 }
 459
 460 asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
 461 {
 462         return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
 463 }
 464
 465 asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
 466 {
 467         mm_segment_t old_fs = get_fs();
 468         int ret;
 469         off_t of;
 470
 471         if (offset && get_user(of, offset))
 472                 return -EFAULT;
 473
 474         set_fs(KERNEL_DS);
 475         ret = sys_sendfile(out_fd, in_fd,
 476                            offset ? (off_t __force __user *) &of : NULL, count);
 477         set_fs(old_fs);
 478
 479         if (offset && put_user(of, offset))
 480                 return -EFAULT;
 481
 482         return ret;
 483 }
 484
 485 asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
 486                                 compat_loff_t __user *offset, s32 count)
 487 {
 488         mm_segment_t old_fs = get_fs();
 489         int ret;
 490         loff_t lof;
 491
 492         if (offset && get_user(lof, offset))
 493                 return -EFAULT;
 494
 495         set_fs(KERNEL_DS);
 496         ret = sys_sendfile64(out_fd, in_fd,
 497                              offset ? (loff_t __force __user *) &lof : NULL,
 498                              count);
 499         set_fs(old_fs);
 500
 501         if (offset && put_user(lof, offset))
 502                 return -EFAULT;
 503
 504         return ret;
 505 }
 506
 507 struct stat64_emu31 {
 508         unsigned long long  st_dev;
 509         unsigned int    __pad1;
 510 #define STAT64_HAS_BROKEN_ST_INO        1
 511         u32             __st_ino;
 512         unsigned int    st_mode;
 513         unsigned int    st_nlink;
 514         u32             st_uid;
 515         u32             st_gid;
 516         unsigned long long  st_rdev;
 517         unsigned int    __pad3;
 518         long            st_size;
 519         u32             st_blksize;
 520         unsigned char   __pad4[4];
 521         u32             __pad5;     /* future possible st_blocks high bits */
 522         u32             st_blocks;  /* Number 512-byte blocks allocated. */
 523         u32             st_atime;
 524         u32             __pad6;
 525         u32             st_mtime;
 526         u32             __pad7;
 527         u32             st_ctime;
 528         u32             __pad8;     /* will be high 32 bits of ctime someday */
 529         unsigned long   st_ino;
 530 };
 531
 532 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
 533 {
 534         struct stat64_emu31 tmp;
 535
 536         memset(&tmp, 0, sizeof(tmp));
 537
 538         tmp.st_dev = huge_encode_dev(stat->dev);
 539         tmp.st_ino = stat->ino;
 540         tmp.__st_ino = (u32)stat->ino;
 541         tmp.st_mode = stat->mode;
 542         tmp.st_nlink = (unsigned int)stat->nlink;
 543         tmp.st_uid = stat->uid;
 544         tmp.st_gid = stat->gid;
 545         tmp.st_rdev = huge_encode_dev(stat->rdev);
 546         tmp.st_size = stat->size;
 547         tmp.st_blksize = (u32)stat->blksize;
 548         tmp.st_blocks = (u32)stat->blocks;
 549         tmp.st_atime = (u32)stat->atime.tv_sec;
 550         tmp.st_mtime = (u32)stat->mtime.tv_sec;
 551         tmp.st_ctime = (u32)stat->ctime.tv_sec;
 552
 553         return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
 554 }
 555
 556 asmlinkage long sys32_stat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
 557 {
 558         struct kstat stat;
 559         int ret = vfs_stat(filename, &stat);
 560         if (!ret)
 561                 ret = cp_stat64(statbuf, &stat);
 562         return ret;
 563 }
 564
 565 asmlinkage long sys32_lstat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
 566 {
 567         struct kstat stat;
 568         int ret = vfs_lstat(filename, &stat);
 569         if (!ret)
 570                 ret = cp_stat64(statbuf, &stat);
 571         return ret;
 572 }
 573
 574 asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
 575 {
 576         struct kstat stat;
 577         int ret = vfs_fstat(fd, &stat);
 578         if (!ret)
 579                 ret = cp_stat64(statbuf, &stat);
 580         return ret;
 581 }
 582
 583 asmlinkage long sys32_fstatat64(unsigned int dfd, const char __user *filename,
 584                                 struct stat64_emu31 __user* statbuf, int flag)
 585 {
 586         struct kstat stat;
 587         int error;
 588
 589         error = vfs_fstatat(dfd, filename, &stat, flag);
 590         if (error)
 591                 return error;
 592         return cp_stat64(statbuf, &stat);
 593 }
 594
 595 /*
 596  * Linux/i386 didn't use to be able to handle more than
 597  * 4 system call parameters, so these system calls used a memory
 598  * block for parameter passing..
 599  */
 600
 601 struct mmap_arg_struct_emu31 {
 602         compat_ulong_t addr;
 603         compat_ulong_t len;
 604         compat_ulong_t prot;
 605         compat_ulong_t flags;
 606         compat_ulong_t fd;
 607         compat_ulong_t offset;
 608 };
 609
 610 asmlinkage unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
 611 {
 612         struct mmap_arg_struct_emu31 a;
 613
 614         if (copy_from_user(&a, arg, sizeof(a)))
 615                 return -EFAULT;
 616         if (a.offset & ~PAGE_MASK)
 617                 return -EINVAL;
 618         a.addr = (unsigned long) compat_ptr(a.addr);
 619         return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
 620                               a.offset >> PAGE_SHIFT);
 621 }
 622
 623 asmlinkage long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
 624 {
 625         struct mmap_arg_struct_emu31 a;
 626
 627         if (copy_from_user(&a, arg, sizeof(a)))
 628                 return -EFAULT;
 629         a.addr = (unsigned long) compat_ptr(a.addr);
 630         return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
 631 }
 632
 633 asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
 634 {
 635         if ((compat_ssize_t) count < 0)
 636                 return -EINVAL;
 637
 638         return sys_read(fd, buf, count);
 639 }
 640
 641 asmlinkage long sys32_write(unsigned int fd, const char __user * buf, size_t count)
 642 {
 643         if ((compat_ssize_t) count < 0)
 644                 return -EINVAL;
 645
 646         return sys_write(fd, buf, count);
 647 }
 648
 649 /*
 650  * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
 651  * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
 652  * because the 31 bit values differ from the 64 bit values.
 653  */
 654
 655 asmlinkage long
 656 sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
 657 {
 658         if (advise == 4)
 659                 advise = POSIX_FADV_DONTNEED;
 660         else if (advise == 5)
 661                 advise = POSIX_FADV_NOREUSE;
 662         return sys_fadvise64(fd, offset, len, advise);
 663 }
 664
 665 struct fadvise64_64_args {
 666         int fd;
 667         long long offset;
 668         long long len;
 669         int advice;
 670 };
 671
 672 asmlinkage long
 673 sys32_fadvise64_64(struct fadvise64_64_args __user *args)
 674 {
 675         struct fadvise64_64_args a;
 676
 677         if ( copy_from_user(&a, args, sizeof(a)) )
 678                 return -EFAULT;
 679         if (a.advice == 4)
 680                 a.advice = POSIX_FADV_DONTNEED;
 681         else if (a.advice == 5)
 682                 a.advice = POSIX_FADV_NOREUSE;
 683         return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
 684 }