arch/powerpc/kernel/sys_ppc32.c

   1 /*
   2  * sys_ppc32.c: Conversion between 32bit and 64bit native syscalls.
   3  *
   4  * Copyright (C) 2001 IBM
   5  * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   6  * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
   7  *
   8  * These routines maintain argument size conversion between 32bit and 64bit
   9  * environment.
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/sched.h>
  19 #include <linux/fs.h>
  20 #include <linux/mm.h>
  21 #include <linux/file.h>
  22 #include <linux/signal.h>
  23 #include <linux/resource.h>
  24 #include <linux/times.h>
  25 #include <linux/smp.h>
  26 #include <linux/smp_lock.h>
  27 #include <linux/sem.h>
  28 #include <linux/msg.h>
  29 #include <linux/shm.h>
  30 #include <linux/poll.h>
  31 #include <linux/personality.h>
  32 #include <linux/stat.h>
  33 #include <linux/mman.h>
  34 #include <linux/in.h>
  35 #include <linux/syscalls.h>
  36 #include <linux/unistd.h>
  37 #include <linux/sysctl.h>
  38 #include <linux/binfmts.h>
  39 #include <linux/security.h>
  40 #include <linux/compat.h>
  41 #include <linux/ptrace.h>
  42 #include <linux/elf.h>
  43 #include <linux/ipc.h>
  44 #include <linux/slab.h>
  45
  46 #include <asm/ptrace.h>
  47 #include <asm/types.h>
  48 #include <asm/uaccess.h>
  49 #include <asm/unistd.h>
  50 #include <asm/time.h>
  51 #include <asm/mmu_context.h>
  52 #include <asm/ppc-pci.h>
  53 #include <asm/syscalls.h>
  54
  55
  56 asmlinkage long ppc32_select(u32 n, compat_ulong_t __user *inp,
  57                 compat_ulong_t __user *outp, compat_ulong_t __user *exp,
  58                 compat_uptr_t tvp_x)
  59 {
  60         /* sign extend n */
  61         return compat_sys_select((int)n, inp, outp, exp, compat_ptr(tvp_x));
  62 }
  63
  64 /* Note: it is necessary to treat option as an unsigned int,
  65  * with the corresponding cast to a signed int to insure that the
  66  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
  67  * and the register representation of a signed int (msr in 64-bit mode) is performed.
  68  */
  69 asmlinkage long compat_sys_sysfs(u32 option, u32 arg1, u32 arg2)
  70 {
  71         return sys_sysfs((int)option, arg1, arg2);
  72 }
  73
  74 #ifdef CONFIG_SYSVIPC
  75 long compat_sys_ipc(u32 call, u32 first, u32 second, u32 third, compat_uptr_t ptr,
  76                u32 fifth)
  77 {
  78         int version;
  79
  80         version = call >> 16; /* hack for backward compatibility */
  81         call &= 0xffff;
  82
  83         switch (call) {
  84
  85         case SEMTIMEDOP:
  86                 if (fifth)
  87                         /* sign extend semid */
  88                         return compat_sys_semtimedop((int)first,
  89                                                      compat_ptr(ptr), second,
  90                                                      compat_ptr(fifth));
  91                 /* else fall through for normal semop() */
  92         case SEMOP:
  93                 /* struct sembuf is the same on 32 and 64bit :)) */
  94                 /* sign extend semid */
  95                 return sys_semtimedop((int)first, compat_ptr(ptr), second,
  96                                       NULL);
  97         case SEMGET:
  98                 /* sign extend key, nsems */
  99                 return sys_semget((int)first, (int)second, third);
 100         case SEMCTL:
 101                 /* sign extend semid, semnum */
 102                 return compat_sys_semctl((int)first, (int)second, third,
 103                                          compat_ptr(ptr));
 104
 105         case MSGSND:
 106                 /* sign extend msqid */
 107                 return compat_sys_msgsnd((int)first, (int)second, third,
 108                                          compat_ptr(ptr));
 109         case MSGRCV:
 110                 /* sign extend msqid, msgtyp */
 111                 return compat_sys_msgrcv((int)first, second, (int)fifth,
 112                                          third, version, compat_ptr(ptr));
 113         case MSGGET:
 114                 /* sign extend key */
 115                 return sys_msgget((int)first, second);
 116         case MSGCTL:
 117                 /* sign extend msqid */
 118                 return compat_sys_msgctl((int)first, second, compat_ptr(ptr));
 119
 120         case SHMAT:
 121                 /* sign extend shmid */
 122                 return compat_sys_shmat((int)first, second, third, version,
 123                                         compat_ptr(ptr));
 124         case SHMDT:
 125                 return sys_shmdt(compat_ptr(ptr));
 126         case SHMGET:
 127                 /* sign extend key_t */
 128                 return sys_shmget((int)first, second, third);
 129         case SHMCTL:
 130                 /* sign extend shmid */
 131                 return compat_sys_shmctl((int)first, second, compat_ptr(ptr));
 132
 133         default:
 134                 return -ENOSYS;
 135         }
 136
 137         return -ENOSYS;
 138 }
 139 #endif
 140
 141 /* Note: it is necessary to treat out_fd and in_fd as unsigned ints,
 142  * with the corresponding cast to a signed int to insure that the
 143  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 144  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 145  */
 146 asmlinkage long compat_sys_sendfile(u32 out_fd, u32 in_fd, compat_off_t __user * offset, u32 count)
 147 {
 148         mm_segment_t old_fs = get_fs();
 149         int ret;
 150         off_t of;
 151         off_t __user *up;
 152
 153         if (offset && get_user(of, offset))
 154                 return -EFAULT;
 155
 156         /* The __user pointer cast is valid because of the set_fs() */
 157         set_fs(KERNEL_DS);
 158         up = offset ? (off_t __user *) &of : NULL;
 159         ret = sys_sendfile((int)out_fd, (int)in_fd, up, count);
 160         set_fs(old_fs);
 161
 162         if (offset && put_user(of, offset))
 163                 return -EFAULT;
 164
 165         return ret;
 166 }
 167
 168 asmlinkage int compat_sys_sendfile64(int out_fd, int in_fd, compat_loff_t __user *offset, s32 count)
 169 {
 170         mm_segment_t old_fs = get_fs();
 171         int ret;
 172         loff_t lof;
 173         loff_t __user *up;
 174
 175         if (offset && get_user(lof, offset))
 176                 return -EFAULT;
 177
 178         /* The __user pointer cast is valid because of the set_fs() */
 179         set_fs(KERNEL_DS);
 180         up = offset ? (loff_t __user *) &lof : NULL;
 181         ret = sys_sendfile64(out_fd, in_fd, up, count);
 182         set_fs(old_fs);
 183
 184         if (offset && put_user(lof, offset))
 185                 return -EFAULT;
 186
 187         return ret;
 188 }
 189
 190 long compat_sys_execve(unsigned long a0, unsigned long a1, unsigned long a2,
 191                   unsigned long a3, unsigned long a4, unsigned long a5,
 192                   struct pt_regs *regs)
 193 {
 194         int error;
 195         char * filename;
 196
 197         filename = getname((char __user *) a0);
 198         error = PTR_ERR(filename);
 199         if (IS_ERR(filename))
 200                 goto out;
 201         flush_fp_to_thread(current);
 202         flush_altivec_to_thread(current);
 203
 204         error = compat_do_execve(filename, compat_ptr(a1), compat_ptr(a2), regs);
 205
 206         putname(filename);
 207
 208 out:
 209         return error;
 210 }
 211
 212 /* Note: it is necessary to treat option as an unsigned int,
 213  * with the corresponding cast to a signed int to insure that the
 214  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 215  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 216  */
 217 asmlinkage long compat_sys_prctl(u32 option, u32 arg2, u32 arg3, u32 arg4, u32 arg5)
 218 {
 219         return sys_prctl((int)option,
 220                          (unsigned long) arg2,
 221                          (unsigned long) arg3,
 222                          (unsigned long) arg4,
 223                          (unsigned long) arg5);
 224 }
 225
 226 /* Note: it is necessary to treat pid as an unsigned int,
 227  * with the corresponding cast to a signed int to insure that the
 228  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 229  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 230  */
 231 asmlinkage long compat_sys_sched_rr_get_interval(u32 pid, struct compat_timespec __user *interval)
 232 {
 233         struct timespec t;
 234         int ret;
 235         mm_segment_t old_fs = get_fs ();
 236
 237         /* The __user pointer cast is valid because of the set_fs() */
 238         set_fs (KERNEL_DS);
 239         ret = sys_sched_rr_get_interval((int)pid, (struct timespec __user *) &t);
 240         set_fs (old_fs);
 241         if (put_compat_timespec(&t, interval))
 242                 return -EFAULT;
 243         return ret;
 244 }
 245
 246 /* Note: it is necessary to treat mode as an unsigned int,
 247  * with the corresponding cast to a signed int to insure that the
 248  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 249  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 250  */
 251 asmlinkage long compat_sys_access(const char __user * filename, u32 mode)
 252 {
 253         return sys_access(filename, (int)mode);
 254 }
 255
 256
 257 /* Note: it is necessary to treat mode as an unsigned int,
 258  * with the corresponding cast to a signed int to insure that the
 259  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 260  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 261  */
 262 asmlinkage long compat_sys_creat(const char __user * pathname, u32 mode)
 263 {
 264         return sys_creat(pathname, (int)mode);
 265 }
 266
 267
 268 /* Note: it is necessary to treat pid and options as unsigned ints,
 269  * with the corresponding cast to a signed int to insure that the
 270  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 271  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 272  */
 273 asmlinkage long compat_sys_waitpid(u32 pid, unsigned int __user * stat_addr, u32 options)
 274 {
 275         return sys_waitpid((int)pid, stat_addr, (int)options);
 276 }
 277
 278
 279 /* Note: it is necessary to treat gidsetsize as an unsigned int,
 280  * with the corresponding cast to a signed int to insure that the
 281  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 282  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 283  */
 284 asmlinkage long compat_sys_getgroups(u32 gidsetsize, gid_t __user *grouplist)
 285 {
 286         return sys_getgroups((int)gidsetsize, grouplist);
 287 }
 288
 289
 290 /* Note: it is necessary to treat pid as an unsigned int,
 291  * with the corresponding cast to a signed int to insure that the
 292  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 293  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 294  */
 295 asmlinkage long compat_sys_getpgid(u32 pid)
 296 {
 297         return sys_getpgid((int)pid);
 298 }
 299
 300
 301
 302 /* Note: it is necessary to treat pid as an unsigned int,
 303  * with the corresponding cast to a signed int to insure that the
 304  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 305  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 306  */
 307 asmlinkage long compat_sys_getsid(u32 pid)
 308 {
 309         return sys_getsid((int)pid);
 310 }
 311
 312
 313 /* Note: it is necessary to treat pid and sig as unsigned ints,
 314  * with the corresponding cast to a signed int to insure that the
 315  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 316  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 317  */
 318 asmlinkage long compat_sys_kill(u32 pid, u32 sig)
 319 {
 320         return sys_kill((int)pid, (int)sig);
 321 }
 322
 323
 324 /* Note: it is necessary to treat mode as an unsigned int,
 325  * with the corresponding cast to a signed int to insure that the
 326  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 327  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 328  */
 329 asmlinkage long compat_sys_mkdir(const char __user * pathname, u32 mode)
 330 {
 331         return sys_mkdir(pathname, (int)mode);
 332 }
 333
 334 long compat_sys_nice(u32 increment)
 335 {
 336         /* sign extend increment */
 337         return sys_nice((int)increment);
 338 }
 339
 340 off_t ppc32_lseek(unsigned int fd, u32 offset, unsigned int origin)
 341 {
 342         /* sign extend n */
 343         return sys_lseek(fd, (int)offset, origin);
 344 }
 345
 346 long compat_sys_truncate(const char __user * path, u32 length)
 347 {
 348         /* sign extend length */
 349         return sys_truncate(path, (int)length);
 350 }
 351
 352 long compat_sys_ftruncate(int fd, u32 length)
 353 {
 354         /* sign extend length */
 355         return sys_ftruncate(fd, (int)length);
 356 }
 357
 358 /* Note: it is necessary to treat bufsiz as an unsigned int,
 359  * with the corresponding cast to a signed int to insure that the
 360  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 361  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 362  */
 363 asmlinkage long compat_sys_readlink(const char __user * path, char __user * buf, u32 bufsiz)
 364 {
 365         return sys_readlink(path, buf, (int)bufsiz);
 366 }
 367
 368 /* Note: it is necessary to treat option as an unsigned int,
 369  * with the corresponding cast to a signed int to insure that the
 370  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 371  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 372  */
 373 asmlinkage long compat_sys_sched_get_priority_max(u32 policy)
 374 {
 375         return sys_sched_get_priority_max((int)policy);
 376 }
 377
 378
 379 /* Note: it is necessary to treat policy as an unsigned int,
 380  * with the corresponding cast to a signed int to insure that the
 381  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 382  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 383  */
 384 asmlinkage long compat_sys_sched_get_priority_min(u32 policy)
 385 {
 386         return sys_sched_get_priority_min((int)policy);
 387 }
 388
 389
 390 /* Note: it is necessary to treat pid as an unsigned int,
 391  * with the corresponding cast to a signed int to insure that the
 392  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 393  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 394  */
 395 asmlinkage long compat_sys_sched_getparam(u32 pid, struct sched_param __user *param)
 396 {
 397         return sys_sched_getparam((int)pid, param);
 398 }
 399
 400
 401 /* Note: it is necessary to treat pid as an unsigned int,
 402  * with the corresponding cast to a signed int to insure that the
 403  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 404  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 405  */
 406 asmlinkage long compat_sys_sched_getscheduler(u32 pid)
 407 {
 408         return sys_sched_getscheduler((int)pid);
 409 }
 410
 411
 412 /* Note: it is necessary to treat pid as an unsigned int,
 413  * with the corresponding cast to a signed int to insure that the
 414  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 415  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 416  */
 417 asmlinkage long compat_sys_sched_setparam(u32 pid, struct sched_param __user *param)
 418 {
 419         return sys_sched_setparam((int)pid, param);
 420 }
 421
 422
 423 /* Note: it is necessary to treat pid and policy as unsigned ints,
 424  * with the corresponding cast to a signed int to insure that the
 425  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 426  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 427  */
 428 asmlinkage long compat_sys_sched_setscheduler(u32 pid, u32 policy, struct sched_param __user *param)
 429 {
 430         return sys_sched_setscheduler((int)pid, (int)policy, param);
 431 }
 432
 433
 434 /* Note: it is necessary to treat len as an unsigned int,
 435  * with the corresponding cast to a signed int to insure that the
 436  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 437  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 438  */
 439 asmlinkage long compat_sys_setdomainname(char __user *name, u32 len)
 440 {
 441         return sys_setdomainname(name, (int)len);
 442 }
 443
 444
 445 /* Note: it is necessary to treat gidsetsize as an unsigned int,
 446  * with the corresponding cast to a signed int to insure that the
 447  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 448  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 449  */
 450 asmlinkage long compat_sys_setgroups(u32 gidsetsize, gid_t __user *grouplist)
 451 {
 452         return sys_setgroups((int)gidsetsize, grouplist);
 453 }
 454
 455
 456 asmlinkage long compat_sys_sethostname(char __user *name, u32 len)
 457 {
 458         /* sign extend len */
 459         return sys_sethostname(name, (int)len);
 460 }
 461
 462
 463 /* Note: it is necessary to treat pid and pgid as unsigned ints,
 464  * with the corresponding cast to a signed int to insure that the
 465  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 466  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 467  */
 468 asmlinkage long compat_sys_setpgid(u32 pid, u32 pgid)
 469 {
 470         return sys_setpgid((int)pid, (int)pgid);
 471 }
 472
 473 long compat_sys_getpriority(u32 which, u32 who)
 474 {
 475         /* sign extend which and who */
 476         return sys_getpriority((int)which, (int)who);
 477 }
 478
 479 long compat_sys_setpriority(u32 which, u32 who, u32 niceval)
 480 {
 481         /* sign extend which, who and niceval */
 482         return sys_setpriority((int)which, (int)who, (int)niceval);
 483 }
 484
 485 long compat_sys_ioprio_get(u32 which, u32 who)
 486 {
 487         /* sign extend which and who */
 488         return sys_ioprio_get((int)which, (int)who);
 489 }
 490
 491 long compat_sys_ioprio_set(u32 which, u32 who, u32 ioprio)
 492 {
 493         /* sign extend which, who and ioprio */
 494         return sys_ioprio_set((int)which, (int)who, (int)ioprio);
 495 }
 496
 497 /* Note: it is necessary to treat newmask as an unsigned int,
 498  * with the corresponding cast to a signed int to insure that the
 499  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 500  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 501  */
 502 asmlinkage long compat_sys_ssetmask(u32 newmask)
 503 {
 504         return sys_ssetmask((int) newmask);
 505 }
 506
 507 asmlinkage long compat_sys_syslog(u32 type, char __user * buf, u32 len)
 508 {
 509         /* sign extend len */
 510         return sys_syslog(type, buf, (int)len);
 511 }
 512
 513
 514 /* Note: it is necessary to treat mask as an unsigned int,
 515  * with the corresponding cast to a signed int to insure that the
 516  * proper conversion (sign extension) between the register representation of a signed int (msr in 32-bit mode)
 517  * and the register representation of a signed int (msr in 64-bit mode) is performed.
 518  */
 519 asmlinkage long compat_sys_umask(u32 mask)
 520 {
 521         return sys_umask((int)mask);
 522 }
 523
 524 unsigned long compat_sys_mmap2(unsigned long addr, size_t len,
 525                           unsigned long prot, unsigned long flags,
 526                           unsigned long fd, unsigned long pgoff)
 527 {
 528         /* This should remain 12 even if PAGE_SIZE changes */
 529         return sys_mmap(addr, len, prot, flags, fd, pgoff << 12);
 530 }
 531
 532 long compat_sys_tgkill(u32 tgid, u32 pid, int sig)
 533 {
 534         /* sign extend tgid, pid */
 535         return sys_tgkill((int)tgid, (int)pid, sig);
 536 }
 537
 538 /*
 539  * long long munging:
 540  * The 32 bit ABI passes long longs in an odd even register pair.
 541  */
 542
 543 compat_ssize_t compat_sys_pread64(unsigned int fd, char __user *ubuf, compat_size_t count,
 544                              u32 reg6, u32 poshi, u32 poslo)
 545 {
 546         return sys_pread64(fd, ubuf, count, ((loff_t)poshi << 32) | poslo);
 547 }
 548
 549 compat_ssize_t compat_sys_pwrite64(unsigned int fd, char __user *ubuf, compat_size_t count,
 550                               u32 reg6, u32 poshi, u32 poslo)
 551 {
 552         return sys_pwrite64(fd, ubuf, count, ((loff_t)poshi << 32) | poslo);
 553 }
 554
 555 compat_ssize_t compat_sys_readahead(int fd, u32 r4, u32 offhi, u32 offlo, u32 count)
 556 {
 557         return sys_readahead(fd, ((loff_t)offhi << 32) | offlo, count);
 558 }
 559
 560 asmlinkage int compat_sys_truncate64(const char __user * path, u32 reg4,
 561                                 unsigned long high, unsigned long low)
 562 {
 563         return sys_truncate(path, (high << 32) | low);
 564 }
 565
 566 asmlinkage long compat_sys_fallocate(int fd, int mode, u32 offhi, u32 offlo,
 567                                      u32 lenhi, u32 lenlo)
 568 {
 569         return sys_fallocate(fd, mode, ((loff_t)offhi << 32) | offlo,
 570                              ((loff_t)lenhi << 32) | lenlo);
 571 }
 572
 573 asmlinkage int compat_sys_ftruncate64(unsigned int fd, u32 reg4, unsigned long high,
 574                                  unsigned long low)
 575 {
 576         return sys_ftruncate(fd, (high << 32) | low);
 577 }
 578
 579 long ppc32_lookup_dcookie(u32 cookie_high, u32 cookie_low, char __user *buf,
 580                           size_t len)
 581 {
 582         return sys_lookup_dcookie((u64)cookie_high << 32 | cookie_low,
 583                                   buf, len);
 584 }
 585
 586 long ppc32_fadvise64(int fd, u32 unused, u32 offset_high, u32 offset_low,
 587                      size_t len, int advice)
 588 {
 589         return sys_fadvise64(fd, (u64)offset_high << 32 | offset_low, len,
 590                              advice);
 591 }
 592
 593 asmlinkage long compat_sys_add_key(const char __user *_type,
 594                               const char __user *_description,
 595                               const void __user *_payload,
 596                               u32 plen,
 597                               u32 ringid)
 598 {
 599         return sys_add_key(_type, _description, _payload, plen, ringid);
 600 }
 601
 602 asmlinkage long compat_sys_request_key(const char __user *_type,
 603                                   const char __user *_description,
 604                                   const char __user *_callout_info,
 605                                   u32 destringid)
 606 {
 607         return sys_request_key(_type, _description, _callout_info, destringid);
 608 }
 609
 610 asmlinkage long compat_sys_sync_file_range2(int fd, unsigned int flags,
 611                                    unsigned offset_hi, unsigned offset_lo,
 612                                    unsigned nbytes_hi, unsigned nbytes_lo)
 613 {
 614         loff_t offset = ((loff_t)offset_hi << 32) | offset_lo;
 615         loff_t nbytes = ((loff_t)nbytes_hi << 32) | nbytes_lo;
 616
 617         return sys_sync_file_range(fd, offset, nbytes, flags);
 618 }