Root/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
63long psw_user32_bits = (PSW_BASE32_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
64               PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
65               PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
66long psw32_user_bits = (PSW32_BASE_BITS | PSW32_MASK_DAT | PSW32_ASC_HOME |
67               PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
68               PSW32_MASK_PSTATE);
69 
70/* For this source file, we want overflow handling. */
71
72#undef high2lowuid
73#undef high2lowgid
74#undef low2highuid
75#undef low2highgid
76#undef SET_UID16
77#undef SET_GID16
78#undef NEW_TO_OLD_UID
79#undef NEW_TO_OLD_GID
80#undef SET_OLDSTAT_UID
81#undef SET_OLDSTAT_GID
82#undef SET_STAT_UID
83#undef SET_STAT_GID
84
85#define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
86#define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
87#define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
88#define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
89#define SET_UID16(var, uid) var = high2lowuid(uid)
90#define SET_GID16(var, gid) var = high2lowgid(gid)
91#define NEW_TO_OLD_UID(uid) high2lowuid(uid)
92#define NEW_TO_OLD_GID(gid) high2lowgid(gid)
93#define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
94#define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
95#define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
96#define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
97
98asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
99{
100    return sys_chown(filename, low2highuid(user), low2highgid(group));
101}
102
103asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
104{
105    return sys_lchown(filename, low2highuid(user), low2highgid(group));
106}
107
108asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
109{
110    return sys_fchown(fd, low2highuid(user), low2highgid(group));
111}
112
113asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
114{
115    return sys_setregid(low2highgid(rgid), low2highgid(egid));
116}
117
118asmlinkage long sys32_setgid16(u16 gid)
119{
120    return sys_setgid((gid_t)gid);
121}
122
123asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
124{
125    return sys_setreuid(low2highuid(ruid), low2highuid(euid));
126}
127
128asmlinkage long sys32_setuid16(u16 uid)
129{
130    return sys_setuid((uid_t)uid);
131}
132
133asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
134{
135    return sys_setresuid(low2highuid(ruid), low2highuid(euid),
136        low2highuid(suid));
137}
138
139asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid)
140{
141    int retval;
142
143    if (!(retval = put_user(high2lowuid(current->cred->uid), ruid)) &&
144        !(retval = put_user(high2lowuid(current->cred->euid), euid)))
145        retval = put_user(high2lowuid(current->cred->suid), suid);
146
147    return retval;
148}
149
150asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
151{
152    return sys_setresgid(low2highgid(rgid), low2highgid(egid),
153        low2highgid(sgid));
154}
155
156asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid)
157{
158    int retval;
159
160    if (!(retval = put_user(high2lowgid(current->cred->gid), rgid)) &&
161        !(retval = put_user(high2lowgid(current->cred->egid), egid)))
162        retval = put_user(high2lowgid(current->cred->sgid), sgid);
163
164    return retval;
165}
166
167asmlinkage long sys32_setfsuid16(u16 uid)
168{
169    return sys_setfsuid((uid_t)uid);
170}
171
172asmlinkage long sys32_setfsgid16(u16 gid)
173{
174    return sys_setfsgid((gid_t)gid);
175}
176
177static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
178{
179    int i;
180    u16 group;
181
182    for (i = 0; i < group_info->ngroups; i++) {
183        group = (u16)GROUP_AT(group_info, i);
184        if (put_user(group, grouplist+i))
185            return -EFAULT;
186    }
187
188    return 0;
189}
190
191static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
192{
193    int i;
194    u16 group;
195
196    for (i = 0; i < group_info->ngroups; i++) {
197        if (get_user(group, grouplist+i))
198            return -EFAULT;
199        GROUP_AT(group_info, i) = (gid_t)group;
200    }
201
202    return 0;
203}
204
205asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
206{
207    int i;
208
209    if (gidsetsize < 0)
210        return -EINVAL;
211
212    get_group_info(current->cred->group_info);
213    i = current->cred->group_info->ngroups;
214    if (gidsetsize) {
215        if (i > gidsetsize) {
216            i = -EINVAL;
217            goto out;
218        }
219        if (groups16_to_user(grouplist, current->cred->group_info)) {
220            i = -EFAULT;
221            goto out;
222        }
223    }
224out:
225    put_group_info(current->cred->group_info);
226    return i;
227}
228
229asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
230{
231    struct group_info *group_info;
232    int retval;
233
234    if (!capable(CAP_SETGID))
235        return -EPERM;
236    if ((unsigned)gidsetsize > NGROUPS_MAX)
237        return -EINVAL;
238
239    group_info = groups_alloc(gidsetsize);
240    if (!group_info)
241        return -ENOMEM;
242    retval = groups16_from_user(group_info, grouplist);
243    if (retval) {
244        put_group_info(group_info);
245        return retval;
246    }
247
248    retval = set_current_groups(group_info);
249    put_group_info(group_info);
250
251    return retval;
252}
253
254asmlinkage long sys32_getuid16(void)
255{
256    return high2lowuid(current->cred->uid);
257}
258
259asmlinkage long sys32_geteuid16(void)
260{
261    return high2lowuid(current->cred->euid);
262}
263
264asmlinkage long sys32_getgid16(void)
265{
266    return high2lowgid(current->cred->gid);
267}
268
269asmlinkage long sys32_getegid16(void)
270{
271    return high2lowgid(current->cred->egid);
272}
273
274/*
275 * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation.
276 *
277 * This is really horribly ugly.
278 */
279#ifdef CONFIG_SYSVIPC
280asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr)
281{
282    if (call >> 16) /* hack for backward compatibility */
283        return -EINVAL;
284
285    call &= 0xffff;
286
287    switch (call) {
288    case SEMTIMEDOP:
289        return compat_sys_semtimedop(first, compat_ptr(ptr),
290                         second, compat_ptr(third));
291    case SEMOP:
292        /* struct sembuf is the same on 32 and 64bit :)) */
293        return sys_semtimedop(first, compat_ptr(ptr),
294                      second, NULL);
295    case SEMGET:
296        return sys_semget(first, second, third);
297    case SEMCTL:
298        return compat_sys_semctl(first, second, third,
299                     compat_ptr(ptr));
300    case MSGSND:
301        return compat_sys_msgsnd(first, second, third,
302                     compat_ptr(ptr));
303    case MSGRCV:
304        return compat_sys_msgrcv(first, second, 0, third,
305                     0, compat_ptr(ptr));
306    case MSGGET:
307        return sys_msgget((key_t) first, second);
308    case MSGCTL:
309        return compat_sys_msgctl(first, second, compat_ptr(ptr));
310    case SHMAT:
311        return compat_sys_shmat(first, second, third,
312                    0, compat_ptr(ptr));
313    case SHMDT:
314        return sys_shmdt(compat_ptr(ptr));
315    case SHMGET:
316        return sys_shmget(first, (unsigned)second, third);
317    case SHMCTL:
318        return compat_sys_shmctl(first, second, compat_ptr(ptr));
319    }
320
321    return -ENOSYS;
322}
323#endif
324
325asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
326{
327    if ((int)high < 0)
328        return -EINVAL;
329    else
330        return sys_truncate(path, (high << 32) | low);
331}
332
333asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
334{
335    if ((int)high < 0)
336        return -EINVAL;
337    else
338        return sys_ftruncate(fd, (high << 32) | low);
339}
340
341asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
342                struct compat_timespec __user *interval)
343{
344    struct timespec t;
345    int ret;
346    mm_segment_t old_fs = get_fs ();
347    
348    set_fs (KERNEL_DS);
349    ret = sys_sched_rr_get_interval(pid,
350                    (struct timespec __force __user *) &t);
351    set_fs (old_fs);
352    if (put_compat_timespec(&t, interval))
353        return -EFAULT;
354    return ret;
355}
356
357asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
358            compat_sigset_t __user *oset, size_t sigsetsize)
359{
360    sigset_t s;
361    compat_sigset_t s32;
362    int ret;
363    mm_segment_t old_fs = get_fs();
364    
365    if (set) {
366        if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
367            return -EFAULT;
368        switch (_NSIG_WORDS) {
369        case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
370        case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
371        case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
372        case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
373        }
374    }
375    set_fs (KERNEL_DS);
376    ret = sys_rt_sigprocmask(how,
377                 set ? (sigset_t __force __user *) &s : NULL,
378                 oset ? (sigset_t __force __user *) &s : NULL,
379                 sigsetsize);
380    set_fs (old_fs);
381    if (ret) return ret;
382    if (oset) {
383        switch (_NSIG_WORDS) {
384        case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
385        case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
386        case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
387        case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
388        }
389        if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
390            return -EFAULT;
391    }
392    return 0;
393}
394
395asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
396                size_t sigsetsize)
397{
398    sigset_t s;
399    compat_sigset_t s32;
400    int ret;
401    mm_segment_t old_fs = get_fs();
402        
403    set_fs (KERNEL_DS);
404    ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
405    set_fs (old_fs);
406    if (!ret) {
407        switch (_NSIG_WORDS) {
408        case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
409        case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
410        case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
411        case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
412        }
413        if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
414            return -EFAULT;
415    }
416    return ret;
417}
418
419asmlinkage long
420sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
421{
422    siginfo_t info;
423    int ret;
424    mm_segment_t old_fs = get_fs();
425    
426    if (copy_siginfo_from_user32(&info, uinfo))
427        return -EFAULT;
428    set_fs (KERNEL_DS);
429    ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);
430    set_fs (old_fs);
431    return ret;
432}
433
434/*
435 * sys32_execve() executes a new program after the asm stub has set
436 * things up for us. This should basically do what I want it to.
437 */
438asmlinkage long sys32_execve(const char __user *name, compat_uptr_t __user *argv,
439                 compat_uptr_t __user *envp)
440{
441    struct pt_regs *regs = task_pt_regs(current);
442    char *filename;
443    long rc;
444
445    filename = getname(name);
446    rc = PTR_ERR(filename);
447    if (IS_ERR(filename))
448        return rc;
449    rc = compat_do_execve(filename, argv, envp, regs);
450    if (rc)
451        goto out;
452    current->thread.fp_regs.fpc=0;
453    asm volatile("sfpc %0,0" : : "d" (0));
454    rc = regs->gprs[2];
455out:
456    putname(filename);
457    return rc;
458}
459
460asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
461                size_t count, u32 poshi, u32 poslo)
462{
463    if ((compat_ssize_t) count < 0)
464        return -EINVAL;
465    return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
466}
467
468asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
469                size_t count, u32 poshi, u32 poslo)
470{
471    if ((compat_ssize_t) count < 0)
472        return -EINVAL;
473    return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
474}
475
476asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
477{
478    return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
479}
480
481asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
482{
483    mm_segment_t old_fs = get_fs();
484    int ret;
485    off_t of;
486    
487    if (offset && get_user(of, offset))
488        return -EFAULT;
489        
490    set_fs(KERNEL_DS);
491    ret = sys_sendfile(out_fd, in_fd,
492               offset ? (off_t __force __user *) &of : NULL, count);
493    set_fs(old_fs);
494    
495    if (offset && put_user(of, offset))
496        return -EFAULT;
497        
498    return ret;
499}
500
501asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
502                compat_loff_t __user *offset, s32 count)
503{
504    mm_segment_t old_fs = get_fs();
505    int ret;
506    loff_t lof;
507    
508    if (offset && get_user(lof, offset))
509        return -EFAULT;
510        
511    set_fs(KERNEL_DS);
512    ret = sys_sendfile64(out_fd, in_fd,
513                 offset ? (loff_t __force __user *) &lof : NULL,
514                 count);
515    set_fs(old_fs);
516    
517    if (offset && put_user(lof, offset))
518        return -EFAULT;
519        
520    return ret;
521}
522
523struct stat64_emu31 {
524    unsigned long long st_dev;
525    unsigned int __pad1;
526#define STAT64_HAS_BROKEN_ST_INO 1
527    u32 __st_ino;
528    unsigned int st_mode;
529    unsigned int st_nlink;
530    u32 st_uid;
531    u32 st_gid;
532    unsigned long long st_rdev;
533    unsigned int __pad3;
534    long st_size;
535    u32 st_blksize;
536    unsigned char __pad4[4];
537    u32 __pad5; /* future possible st_blocks high bits */
538    u32 st_blocks; /* Number 512-byte blocks allocated. */
539    u32 st_atime;
540    u32 __pad6;
541    u32 st_mtime;
542    u32 __pad7;
543    u32 st_ctime;
544    u32 __pad8; /* will be high 32 bits of ctime someday */
545    unsigned long st_ino;
546};
547
548static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
549{
550    struct stat64_emu31 tmp;
551
552    memset(&tmp, 0, sizeof(tmp));
553
554    tmp.st_dev = huge_encode_dev(stat->dev);
555    tmp.st_ino = stat->ino;
556    tmp.__st_ino = (u32)stat->ino;
557    tmp.st_mode = stat->mode;
558    tmp.st_nlink = (unsigned int)stat->nlink;
559    tmp.st_uid = stat->uid;
560    tmp.st_gid = stat->gid;
561    tmp.st_rdev = huge_encode_dev(stat->rdev);
562    tmp.st_size = stat->size;
563    tmp.st_blksize = (u32)stat->blksize;
564    tmp.st_blocks = (u32)stat->blocks;
565    tmp.st_atime = (u32)stat->atime.tv_sec;
566    tmp.st_mtime = (u32)stat->mtime.tv_sec;
567    tmp.st_ctime = (u32)stat->ctime.tv_sec;
568
569    return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
570}
571
572asmlinkage long sys32_stat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
573{
574    struct kstat stat;
575    int ret = vfs_stat(filename, &stat);
576    if (!ret)
577        ret = cp_stat64(statbuf, &stat);
578    return ret;
579}
580
581asmlinkage long sys32_lstat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
582{
583    struct kstat stat;
584    int ret = vfs_lstat(filename, &stat);
585    if (!ret)
586        ret = cp_stat64(statbuf, &stat);
587    return ret;
588}
589
590asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
591{
592    struct kstat stat;
593    int ret = vfs_fstat(fd, &stat);
594    if (!ret)
595        ret = cp_stat64(statbuf, &stat);
596    return ret;
597}
598
599asmlinkage long sys32_fstatat64(unsigned int dfd, const char __user *filename,
600                struct stat64_emu31 __user* statbuf, int flag)
601{
602    struct kstat stat;
603    int error;
604
605    error = vfs_fstatat(dfd, filename, &stat, flag);
606    if (error)
607        return error;
608    return cp_stat64(statbuf, &stat);
609}
610
611/*
612 * Linux/i386 didn't use to be able to handle more than
613 * 4 system call parameters, so these system calls used a memory
614 * block for parameter passing..
615 */
616
617struct mmap_arg_struct_emu31 {
618    compat_ulong_t addr;
619    compat_ulong_t len;
620    compat_ulong_t prot;
621    compat_ulong_t flags;
622    compat_ulong_t fd;
623    compat_ulong_t offset;
624};
625
626asmlinkage unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
627{
628    struct mmap_arg_struct_emu31 a;
629
630    if (copy_from_user(&a, arg, sizeof(a)))
631        return -EFAULT;
632    if (a.offset & ~PAGE_MASK)
633        return -EINVAL;
634    a.addr = (unsigned long) compat_ptr(a.addr);
635    return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
636                  a.offset >> PAGE_SHIFT);
637}
638
639asmlinkage long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
640{
641    struct mmap_arg_struct_emu31 a;
642
643    if (copy_from_user(&a, arg, sizeof(a)))
644        return -EFAULT;
645    a.addr = (unsigned long) compat_ptr(a.addr);
646    return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
647}
648
649asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
650{
651    if ((compat_ssize_t) count < 0)
652        return -EINVAL;
653
654    return sys_read(fd, buf, count);
655}
656
657asmlinkage long sys32_write(unsigned int fd, const char __user * buf, size_t count)
658{
659    if ((compat_ssize_t) count < 0)
660        return -EINVAL;
661
662    return sys_write(fd, buf, count);
663}
664
665/*
666 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
667 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
668 * because the 31 bit values differ from the 64 bit values.
669 */
670
671asmlinkage long
672sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
673{
674    if (advise == 4)
675        advise = POSIX_FADV_DONTNEED;
676    else if (advise == 5)
677        advise = POSIX_FADV_NOREUSE;
678    return sys_fadvise64(fd, offset, len, advise);
679}
680
681struct fadvise64_64_args {
682    int fd;
683    long long offset;
684    long long len;
685    int advice;
686};
687
688asmlinkage long
689sys32_fadvise64_64(struct fadvise64_64_args __user *args)
690{
691    struct fadvise64_64_args a;
692
693    if ( copy_from_user(&a, args, sizeof(a)) )
694        return -EFAULT;
695    if (a.advice == 4)
696        a.advice = POSIX_FADV_DONTNEED;
697    else if (a.advice == 5)
698        a.advice = POSIX_FADV_NOREUSE;
699    return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
700}
701

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