linux/arch/s390/kernel/compat_linux.c
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   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
  63u32 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
  95asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
  96{
  97        return sys_chown(filename, low2highuid(user), low2highgid(group));
  98}
  99
 100asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
 101{
 102        return sys_lchown(filename, low2highuid(user), low2highgid(group));
 103}
 104
 105asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
 106{
 107        return sys_fchown(fd, low2highuid(user), low2highgid(group));
 108}
 109
 110asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
 111{
 112        return sys_setregid(low2highgid(rgid), low2highgid(egid));
 113}
 114
 115asmlinkage long sys32_setgid16(u16 gid)
 116{
 117        return sys_setgid((gid_t)gid);
 118}
 119
 120asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
 121{
 122        return sys_setreuid(low2highuid(ruid), low2highuid(euid));
 123}
 124
 125asmlinkage long sys32_setuid16(u16 uid)
 126{
 127        return sys_setuid((uid_t)uid);
 128}
 129
 130asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
 131{
 132        return sys_setresuid(low2highuid(ruid), low2highuid(euid),
 133                low2highuid(suid));
 134}
 135
 136asmlinkage 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
 147asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
 148{
 149        return sys_setresgid(low2highgid(rgid), low2highgid(egid),
 150                low2highgid(sgid));
 151}
 152
 153asmlinkage 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
 164asmlinkage long sys32_setfsuid16(u16 uid)
 165{
 166        return sys_setfsuid((uid_t)uid);
 167}
 168
 169asmlinkage long sys32_setfsgid16(u16 gid)
 170{
 171        return sys_setfsgid((gid_t)gid);
 172}
 173
 174static 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
 188static 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
 202asmlinkage 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        }
 221out:
 222        put_group_info(current->cred->group_info);
 223        return i;
 224}
 225
 226asmlinkage 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
 251asmlinkage long sys32_getuid16(void)
 252{
 253        return high2lowuid(current->cred->uid);
 254}
 255
 256asmlinkage long sys32_geteuid16(void)
 257{
 258        return high2lowuid(current->cred->euid);
 259}
 260
 261asmlinkage long sys32_getgid16(void)
 262{
 263        return high2lowgid(current->cred->gid);
 264}
 265
 266asmlinkage 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
 277asmlinkage 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        switch (call) {
 282        case SEMTIMEDOP:
 283                return compat_sys_semtimedop(first, compat_ptr(ptr),
 284                                             second, compat_ptr(third));
 285        case SEMOP:
 286                /* struct sembuf is the same on 32 and 64bit :)) */
 287                return sys_semtimedop(first, compat_ptr(ptr),
 288                                      second, NULL);
 289        case SEMGET:
 290                return sys_semget(first, second, third);
 291        case SEMCTL:
 292                return compat_sys_semctl(first, second, third,
 293                                         compat_ptr(ptr));
 294        case MSGSND:
 295                return compat_sys_msgsnd(first, second, third,
 296                                         compat_ptr(ptr));
 297        case MSGRCV:
 298                return compat_sys_msgrcv(first, second, 0, third,
 299                                         0, compat_ptr(ptr));
 300        case MSGGET:
 301                return sys_msgget((key_t) first, second);
 302        case MSGCTL:
 303                return compat_sys_msgctl(first, second, compat_ptr(ptr));
 304        case SHMAT:
 305                return compat_sys_shmat(first, second, third,
 306                                        0, compat_ptr(ptr));
 307        case SHMDT:
 308                return sys_shmdt(compat_ptr(ptr));
 309        case SHMGET:
 310                return sys_shmget(first, (unsigned)second, third);
 311        case SHMCTL:
 312                return compat_sys_shmctl(first, second, compat_ptr(ptr));
 313        }
 314
 315        return -ENOSYS;
 316}
 317#endif
 318
 319asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
 320{
 321        if ((int)high < 0)
 322                return -EINVAL;
 323        else
 324                return sys_truncate(path, (high << 32) | low);
 325}
 326
 327asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
 328{
 329        if ((int)high < 0)
 330                return -EINVAL;
 331        else
 332                return sys_ftruncate(fd, (high << 32) | low);
 333}
 334
 335asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
 336                                struct compat_timespec __user *interval)
 337{
 338        struct timespec t;
 339        int ret;
 340        mm_segment_t old_fs = get_fs ();
 341        
 342        set_fs (KERNEL_DS);
 343        ret = sys_sched_rr_get_interval(pid,
 344                                        (struct timespec __force __user *) &t);
 345        set_fs (old_fs);
 346        if (put_compat_timespec(&t, interval))
 347                return -EFAULT;
 348        return ret;
 349}
 350
 351asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
 352                        compat_sigset_t __user *oset, size_t sigsetsize)
 353{
 354        sigset_t s;
 355        compat_sigset_t s32;
 356        int ret;
 357        mm_segment_t old_fs = get_fs();
 358        
 359        if (set) {
 360                if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
 361                        return -EFAULT;
 362                s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
 363        }
 364        set_fs (KERNEL_DS);
 365        ret = sys_rt_sigprocmask(how,
 366                                 set ? (sigset_t __force __user *) &s : NULL,
 367                                 oset ? (sigset_t __force __user *) &s : NULL,
 368                                 sigsetsize);
 369        set_fs (old_fs);
 370        if (ret) return ret;
 371        if (oset) {
 372                s32.sig[1] = (s.sig[0] >> 32);
 373                s32.sig[0] = s.sig[0];
 374                if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
 375                        return -EFAULT;
 376        }
 377        return 0;
 378}
 379
 380asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
 381                                size_t sigsetsize)
 382{
 383        sigset_t s;
 384        compat_sigset_t s32;
 385        int ret;
 386        mm_segment_t old_fs = get_fs();
 387                
 388        set_fs (KERNEL_DS);
 389        ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
 390        set_fs (old_fs);
 391        if (!ret) {
 392                s32.sig[1] = (s.sig[0] >> 32);
 393                s32.sig[0] = s.sig[0];
 394                if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
 395                        return -EFAULT;
 396        }
 397        return ret;
 398}
 399
 400asmlinkage long
 401sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
 402{
 403        siginfo_t info;
 404        int ret;
 405        mm_segment_t old_fs = get_fs();
 406        
 407        if (copy_siginfo_from_user32(&info, uinfo))
 408                return -EFAULT;
 409        set_fs (KERNEL_DS);
 410        ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);
 411        set_fs (old_fs);
 412        return ret;
 413}
 414
 415/*
 416 * sys32_execve() executes a new program after the asm stub has set
 417 * things up for us.  This should basically do what I want it to.
 418 */
 419asmlinkage long sys32_execve(const char __user *name, compat_uptr_t __user *argv,
 420                             compat_uptr_t __user *envp)
 421{
 422        struct pt_regs *regs = task_pt_regs(current);
 423        char *filename;
 424        long rc;
 425
 426        filename = getname(name);
 427        rc = PTR_ERR(filename);
 428        if (IS_ERR(filename))
 429                return rc;
 430        rc = compat_do_execve(filename, argv, envp, regs);
 431        if (rc)
 432                goto out;
 433        current->thread.fp_regs.fpc=0;
 434        asm volatile("sfpc %0,0" : : "d" (0));
 435        rc = regs->gprs[2];
 436out:
 437        putname(filename);
 438        return rc;
 439}
 440
 441asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
 442                                size_t count, u32 poshi, u32 poslo)
 443{
 444        if ((compat_ssize_t) count < 0)
 445                return -EINVAL;
 446        return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
 447}
 448
 449asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
 450                                size_t count, u32 poshi, u32 poslo)
 451{
 452        if ((compat_ssize_t) count < 0)
 453                return -EINVAL;
 454        return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
 455}
 456
 457asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
 458{
 459        return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
 460}
 461
 462asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
 463{
 464        mm_segment_t old_fs = get_fs();
 465        int ret;
 466        off_t of;
 467        
 468        if (offset && get_user(of, offset))
 469                return -EFAULT;
 470                
 471        set_fs(KERNEL_DS);
 472        ret = sys_sendfile(out_fd, in_fd,
 473                           offset ? (off_t __force __user *) &of : NULL, count);
 474        set_fs(old_fs);
 475        
 476        if (offset && put_user(of, offset))
 477                return -EFAULT;
 478                
 479        return ret;
 480}
 481
 482asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
 483                                compat_loff_t __user *offset, s32 count)
 484{
 485        mm_segment_t old_fs = get_fs();
 486        int ret;
 487        loff_t lof;
 488        
 489        if (offset && get_user(lof, offset))
 490                return -EFAULT;
 491                
 492        set_fs(KERNEL_DS);
 493        ret = sys_sendfile64(out_fd, in_fd,
 494                             offset ? (loff_t __force __user *) &lof : NULL,
 495                             count);
 496        set_fs(old_fs);
 497        
 498        if (offset && put_user(lof, offset))
 499                return -EFAULT;
 500                
 501        return ret;
 502}
 503
 504struct stat64_emu31 {
 505        unsigned long long  st_dev;
 506        unsigned int    __pad1;
 507#define STAT64_HAS_BROKEN_ST_INO        1
 508        u32             __st_ino;
 509        unsigned int    st_mode;
 510        unsigned int    st_nlink;
 511        u32             st_uid;
 512        u32             st_gid;
 513        unsigned long long  st_rdev;
 514        unsigned int    __pad3;
 515        long            st_size;
 516        u32             st_blksize;
 517        unsigned char   __pad4[4];
 518        u32             __pad5;     /* future possible st_blocks high bits */
 519        u32             st_blocks;  /* Number 512-byte blocks allocated. */
 520        u32             st_atime;
 521        u32             __pad6;
 522        u32             st_mtime;
 523        u32             __pad7;
 524        u32             st_ctime;
 525        u32             __pad8;     /* will be high 32 bits of ctime someday */
 526        unsigned long   st_ino;
 527};      
 528
 529static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
 530{
 531        struct stat64_emu31 tmp;
 532
 533        memset(&tmp, 0, sizeof(tmp));
 534
 535        tmp.st_dev = huge_encode_dev(stat->dev);
 536        tmp.st_ino = stat->ino;
 537        tmp.__st_ino = (u32)stat->ino;
 538        tmp.st_mode = stat->mode;
 539        tmp.st_nlink = (unsigned int)stat->nlink;
 540        tmp.st_uid = stat->uid;
 541        tmp.st_gid = stat->gid;
 542        tmp.st_rdev = huge_encode_dev(stat->rdev);
 543        tmp.st_size = stat->size;
 544        tmp.st_blksize = (u32)stat->blksize;
 545        tmp.st_blocks = (u32)stat->blocks;
 546        tmp.st_atime = (u32)stat->atime.tv_sec;
 547        tmp.st_mtime = (u32)stat->mtime.tv_sec;
 548        tmp.st_ctime = (u32)stat->ctime.tv_sec;
 549
 550        return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; 
 551}
 552
 553asmlinkage long sys32_stat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
 554{
 555        struct kstat stat;
 556        int ret = vfs_stat(filename, &stat);
 557        if (!ret)
 558                ret = cp_stat64(statbuf, &stat);
 559        return ret;
 560}
 561
 562asmlinkage long sys32_lstat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
 563{
 564        struct kstat stat;
 565        int ret = vfs_lstat(filename, &stat);
 566        if (!ret)
 567                ret = cp_stat64(statbuf, &stat);
 568        return ret;
 569}
 570
 571asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
 572{
 573        struct kstat stat;
 574        int ret = vfs_fstat(fd, &stat);
 575        if (!ret)
 576                ret = cp_stat64(statbuf, &stat);
 577        return ret;
 578}
 579
 580asmlinkage long sys32_fstatat64(unsigned int dfd, const char __user *filename,
 581                                struct stat64_emu31 __user* statbuf, int flag)
 582{
 583        struct kstat stat;
 584        int error;
 585
 586        error = vfs_fstatat(dfd, filename, &stat, flag);
 587        if (error)
 588                return error;
 589        return cp_stat64(statbuf, &stat);
 590}
 591
 592/*
 593 * Linux/i386 didn't use to be able to handle more than
 594 * 4 system call parameters, so these system calls used a memory
 595 * block for parameter passing..
 596 */
 597
 598struct mmap_arg_struct_emu31 {
 599        compat_ulong_t addr;
 600        compat_ulong_t len;
 601        compat_ulong_t prot;
 602        compat_ulong_t flags;
 603        compat_ulong_t fd;
 604        compat_ulong_t offset;
 605};
 606
 607asmlinkage unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
 608{
 609        struct mmap_arg_struct_emu31 a;
 610
 611        if (copy_from_user(&a, arg, sizeof(a)))
 612                return -EFAULT;
 613        if (a.offset & ~PAGE_MASK)
 614                return -EINVAL;
 615        a.addr = (unsigned long) compat_ptr(a.addr);
 616        return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
 617                              a.offset >> PAGE_SHIFT);
 618}
 619
 620asmlinkage long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
 621{
 622        struct mmap_arg_struct_emu31 a;
 623
 624        if (copy_from_user(&a, arg, sizeof(a)))
 625                return -EFAULT;
 626        a.addr = (unsigned long) compat_ptr(a.addr);
 627        return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
 628}
 629
 630asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
 631{
 632        if ((compat_ssize_t) count < 0)
 633                return -EINVAL; 
 634
 635        return sys_read(fd, buf, count);
 636}
 637
 638asmlinkage long sys32_write(unsigned int fd, const char __user * buf, size_t count)
 639{
 640        if ((compat_ssize_t) count < 0)
 641                return -EINVAL; 
 642
 643        return sys_write(fd, buf, count);
 644}
 645
 646/*
 647 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
 648 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
 649 * because the 31 bit values differ from the 64 bit values.
 650 */
 651
 652asmlinkage long
 653sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
 654{
 655        if (advise == 4)
 656                advise = POSIX_FADV_DONTNEED;
 657        else if (advise == 5)
 658                advise = POSIX_FADV_NOREUSE;
 659        return sys_fadvise64(fd, offset, len, advise);
 660}
 661
 662struct fadvise64_64_args {
 663        int fd;
 664        long long offset;
 665        long long len;
 666        int advice;
 667};
 668
 669asmlinkage long
 670sys32_fadvise64_64(struct fadvise64_64_args __user *args)
 671{
 672        struct fadvise64_64_args a;
 673
 674        if ( copy_from_user(&a, args, sizeof(a)) )
 675                return -EFAULT;
 676        if (a.advice == 4)
 677                a.advice = POSIX_FADV_DONTNEED;
 678        else if (a.advice == 5)
 679                a.advice = POSIX_FADV_NOREUSE;
 680        return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
 681}
 682
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