aboutsummaryrefslogtreecommitdiff
path: root/sys/compat/linux/linux_file.c
blob: 3d16a94c2c3e83827a3104bec1616bf159a917f0 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
/*-
 * Copyright (c) 1994-1995 Søren Schmidt
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer 
 *    in this position and unchanged.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software withough specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $FreeBSD$
 */

#include "opt_compat.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/dirent.h>
#include <sys/fcntl.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/sysproto.h>
#include <sys/tty.h>
#include <sys/vnode.h>

#include <ufs/ufs/extattr.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/ufsmount.h>

#include <machine/../linux/linux.h>
#include <machine/../linux/linux_proto.h>
#include <compat/linux/linux_util.h>

#ifndef __alpha__
int
linux_creat(struct proc *p, struct linux_creat_args *args)
{
    struct open_args /* {
	char *path;
	int flags;
	int mode;
    } */ bsd_open_args;
    caddr_t sg;

    sg = stackgap_init();
    CHECKALTCREAT(p, &sg, args->path);

#ifdef DEBUG
	if (ldebug(creat))
		printf(ARGS(creat, "%s, %d"), args->path, args->mode);
#endif
    bsd_open_args.path = args->path;
    bsd_open_args.mode = args->mode;
    bsd_open_args.flags = O_WRONLY | O_CREAT | O_TRUNC;
    return open(p, &bsd_open_args);
}
#endif /*!__alpha__*/

int
linux_open(struct proc *p, struct linux_open_args *args)
{
    struct open_args /* {
	char *path;
	int flags;
	int mode;
    } */ bsd_open_args;
    int error;
    caddr_t sg;

    sg = stackgap_init();
    
    if (args->flags & LINUX_O_CREAT)
	CHECKALTCREAT(p, &sg, args->path);
    else
	CHECKALTEXIST(p, &sg, args->path);

#ifdef DEBUG
	if (ldebug(open))
		printf(ARGS(open, "%s, 0x%x, 0x%x"),
		    args->path, args->flags, args->mode);
#endif
    bsd_open_args.flags = 0;
    if (args->flags & LINUX_O_RDONLY)
	bsd_open_args.flags |= O_RDONLY;
    if (args->flags & LINUX_O_WRONLY) 
	bsd_open_args.flags |= O_WRONLY;
    if (args->flags & LINUX_O_RDWR)
	bsd_open_args.flags |= O_RDWR;
    if (args->flags & LINUX_O_NDELAY)
	bsd_open_args.flags |= O_NONBLOCK;
    if (args->flags & LINUX_O_APPEND)
	bsd_open_args.flags |= O_APPEND;
    if (args->flags & LINUX_O_SYNC)
	bsd_open_args.flags |= O_FSYNC;
    if (args->flags & LINUX_O_NONBLOCK)
	bsd_open_args.flags |= O_NONBLOCK;
    if (args->flags & LINUX_FASYNC)
	bsd_open_args.flags |= O_ASYNC;
    if (args->flags & LINUX_O_CREAT)
	bsd_open_args.flags |= O_CREAT;
    if (args->flags & LINUX_O_TRUNC)
	bsd_open_args.flags |= O_TRUNC;
    if (args->flags & LINUX_O_EXCL)
	bsd_open_args.flags |= O_EXCL;
    if (args->flags & LINUX_O_NOCTTY)
	bsd_open_args.flags |= O_NOCTTY;
    bsd_open_args.path = args->path;
    bsd_open_args.mode = args->mode;

    error = open(p, &bsd_open_args);
    PROC_LOCK(p);
    if (!error && !(bsd_open_args.flags & O_NOCTTY) && 
	SESS_LEADER(p) && !(p->p_flag & P_CONTROLT)) {
	struct filedesc *fdp = p->p_fd;
	struct file *fp = fdp->fd_ofiles[p->p_retval[0]];

	PROC_UNLOCK(p);
	if (fp->f_type == DTYPE_VNODE)
	    fo_ioctl(fp, TIOCSCTTY, (caddr_t) 0, p);
    } else
	PROC_UNLOCK(p);
#ifdef DEBUG
	if (ldebug(open))
		printf(LMSG("open returns error %d"), error);
#endif
    return error;
}

int
linux_lseek(struct proc *p, struct linux_lseek_args *args)
{

    struct lseek_args /* {
	int fd;
	int pad;
	off_t offset;
	int whence;
    } */ tmp_args;
    int error;

#ifdef DEBUG
	if (ldebug(lseek))
		printf(ARGS(lseek, "%d, %ld, %d"),
		    args->fdes, (long)args->off, args->whence);
#endif
    tmp_args.fd = args->fdes;
    tmp_args.offset = (off_t)args->off;
    tmp_args.whence = args->whence;
    error = lseek(p, &tmp_args);
    return error;
}

#ifndef __alpha__
int
linux_llseek(struct proc *p, struct linux_llseek_args *args)
{
	struct lseek_args bsd_args;
	int error;
	off_t off;

#ifdef DEBUG
	if (ldebug(llseek))
		printf(ARGS(llseek, "%d, %d:%d, %d"),
		    args->fd, args->ohigh, args->olow, args->whence);
#endif
	off = (args->olow) | (((off_t) args->ohigh) << 32);

	bsd_args.fd = args->fd;
	bsd_args.offset = off;
	bsd_args.whence = args->whence;

	if ((error = lseek(p, &bsd_args)))
		return error;

	if ((error = copyout(p->p_retval, (caddr_t)args->res, sizeof (off_t))))
		return error;

	p->p_retval[0] = 0;
	return 0;
}
#endif /*!__alpha__*/

#ifndef __alpha__
int
linux_readdir(struct proc *p, struct linux_readdir_args *args)
{
	struct linux_getdents_args lda;

	lda.fd = args->fd;
	lda.dent = args->dent;
	lda.count = 1;
	return linux_getdents(p, &lda);
}
#endif /*!__alpha__*/

/*
 * Note that linux_getdents(2) and linux_getdents64(2) have the same
 * arguments. They only differ in the definition of struct dirent they
 * operate on. We use this to common the code, with the exception of
 * accessing struct dirent. Note that linux_readdir(2) is implemented
 * by means of linux_getdents(2). In this case we never operate on
 * struct dirent64 and thus don't need to handle it...
 */

struct l_dirent {
	l_long		d_ino;
	l_off_t		d_off;
	l_ushort	d_reclen;
	char		d_name[LINUX_NAME_MAX + 1];
};

struct l_dirent64 {
	uint64_t	d_ino;
	int64_t		d_off;
	l_ushort	d_reclen;
	u_char		d_type;
	char		d_name[LINUX_NAME_MAX + 1];
};

#define LINUX_RECLEN(de,namlen) \
    ALIGN((((char *)&(de)->d_name - (char *)de) + (namlen) + 1))

#define	LINUX_DIRBLKSIZ		512

static int
getdents_common(struct proc *p, struct linux_getdents64_args *args,
    int is64bit)
{
	register struct dirent *bdp;
	struct vnode *vp;
	caddr_t inp, buf;		/* BSD-format */
	int len, reclen;		/* BSD-format */
	caddr_t outp;			/* Linux-format */
	int resid, linuxreclen=0;	/* Linux-format */
	struct file *fp;
	struct uio auio;
	struct iovec aiov;
	struct vattr va;
	off_t off;
	struct l_dirent linux_dirent;
	struct l_dirent64 linux_dirent64;
	int buflen, error, eofflag, nbytes, justone;
	u_long *cookies = NULL, *cookiep;
	int ncookies;

	if ((error = getvnode(p->p_fd, args->fd, &fp)) != 0)
		return (error);

	if ((fp->f_flag & FREAD) == 0)
		return (EBADF);

	vp = (struct vnode *) fp->f_data;
	if (vp->v_type != VDIR)
		return (EINVAL);

	if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)))
		return (error);

	nbytes = args->count;
	if (nbytes == 1) {
		/* readdir(2) case. Always struct dirent. */
		if (is64bit)
			return (EINVAL);
		nbytes = sizeof(linux_dirent);
		justone = 1;
	} else
		justone = 0;

	off = fp->f_offset;

	buflen = max(LINUX_DIRBLKSIZ, nbytes);
	buflen = min(buflen, MAXBSIZE);
	buf = malloc(buflen, M_TEMP, M_WAITOK);
	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);

again:
	aiov.iov_base = buf;
	aiov.iov_len = buflen;
	auio.uio_iov = &aiov;
	auio.uio_iovcnt = 1;
	auio.uio_rw = UIO_READ;
	auio.uio_segflg = UIO_SYSSPACE;
	auio.uio_procp = p;
	auio.uio_resid = buflen;
	auio.uio_offset = off;

	if (cookies) {
		free(cookies, M_TEMP);
		cookies = NULL;
	}

	if ((error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &ncookies,
		 &cookies)))
		goto out;

	inp = buf;
	outp = (caddr_t)args->dirent;
	resid = nbytes;
	if ((len = buflen - auio.uio_resid) <= 0)
		goto eof;

	cookiep = cookies;

	if (cookies) {
		/*
		 * When using cookies, the vfs has the option of reading from
		 * a different offset than that supplied (UFS truncates the
		 * offset to a block boundary to make sure that it never reads
		 * partway through a directory entry, even if the directory
		 * has been compacted).
		 */
		while (len > 0 && ncookies > 0 && *cookiep <= off) {
			bdp = (struct dirent *) inp;
			len -= bdp->d_reclen;
			inp += bdp->d_reclen;
			cookiep++;
			ncookies--;
		}
	}

	while (len > 0) {
		if (cookiep && ncookies == 0)
			break;
		bdp = (struct dirent *) inp;
		reclen = bdp->d_reclen;
		if (reclen & 3) {
			error = EFAULT;
			goto out;
		}

		if (bdp->d_fileno == 0) {
			inp += reclen;
			if (cookiep) {
				off = *cookiep++;
				ncookies--;
			} else
				off += reclen;

			len -= reclen;
			continue;
		}

		linuxreclen = (is64bit)
		    ? LINUX_RECLEN(&linux_dirent64, bdp->d_namlen)
		    : LINUX_RECLEN(&linux_dirent, bdp->d_namlen);

		if (reclen > len || resid < linuxreclen) {
			outp++;
			break;
		}

		if (justone) {
			/* readdir(2) case. */
			linux_dirent.d_ino = (l_long)bdp->d_fileno;
			linux_dirent.d_off = (l_off_t)linuxreclen;
			linux_dirent.d_reclen = (l_ushort)bdp->d_namlen;
			strcpy(linux_dirent.d_name, bdp->d_name);
			error = copyout(&linux_dirent, outp, linuxreclen);
		} else {
			if (is64bit) {
				linux_dirent64.d_ino = bdp->d_fileno;
				linux_dirent64.d_off = (cookiep)
				    ? (l_off_t)*cookiep
				    : (l_off_t)(off + reclen);
				linux_dirent64.d_reclen =
				    (l_ushort)linuxreclen;
				linux_dirent64.d_type = bdp->d_type;
				strcpy(linux_dirent64.d_name, bdp->d_name);
				error = copyout(&linux_dirent64, outp,
				    linuxreclen);
			} else {
				linux_dirent.d_ino = bdp->d_fileno;
				linux_dirent.d_off = (cookiep)
				    ? (l_off_t)*cookiep
				    : (l_off_t)(off + reclen);
				linux_dirent.d_reclen = (l_ushort)linuxreclen;
				strcpy(linux_dirent.d_name, bdp->d_name);
				error = copyout(&linux_dirent, outp,
				    linuxreclen);
			}
		}
		if (error)
			goto out;

		inp += reclen;
		if (cookiep) {
			off = *cookiep++;
			ncookies--;
		} else
			off += reclen;

		outp += linuxreclen;
		resid -= linuxreclen;
		len -= reclen;
		if (justone)
			break;
	}

	if (outp == (caddr_t)args->dirent)
		goto again;

	fp->f_offset = off;
	if (justone)
		nbytes = resid + linuxreclen;

eof:
	p->p_retval[0] = nbytes - resid;

out:
	if (cookies)
		free(cookies, M_TEMP);

	VOP_UNLOCK(vp, 0, p);
	free(buf, M_TEMP);
	return (error);
}

int
linux_getdents(struct proc *p, struct linux_getdents_args *args)
{

#ifdef DEBUG
	if (ldebug(getdents))
		printf(ARGS(getdents, "%d, *, %d"), args->fd, args->count);
#endif

	return (getdents_common(p, (struct linux_getdents64_args*)args, 0));
}

int
linux_getdents64(struct proc *p, struct linux_getdents64_args *args)
{

#ifdef DEBUG
	if (ldebug(getdents64))
		printf(ARGS(getdents64, "%d, *, %d"), args->fd, args->count);
#endif

	return (getdents_common(p, args, 1));
}

/*
 * These exist mainly for hooks for doing /compat/linux translation.
 */

int
linux_access(struct proc *p, struct linux_access_args *args)
{
	struct access_args bsd;
	caddr_t sg;

	sg = stackgap_init();
	CHECKALTEXIST(p, &sg, args->path);

#ifdef DEBUG
	if (ldebug(access))
		printf(ARGS(access, "%s, %d"), args->path, args->flags);
#endif
	bsd.path = args->path;
	bsd.flags = args->flags;

	return access(p, &bsd);
}

int
linux_unlink(struct proc *p, struct linux_unlink_args *args)
{
	struct unlink_args bsd;
	caddr_t sg;

	sg = stackgap_init();
	CHECKALTEXIST(p, &sg, args->path);

#ifdef DEBUG
	if (ldebug(unlink))
		printf(ARGS(unlink, "%s"), args->path);
#endif
	bsd.path = args->path;

	return unlink(p, &bsd);
}

int
linux_chdir(struct proc *p, struct linux_chdir_args *args)
{
	struct chdir_args bsd;
	caddr_t sg;

	sg = stackgap_init();
	CHECKALTEXIST(p, &sg, args->path);

#ifdef DEBUG
	if (ldebug(chdir))
		printf(ARGS(chdir, "%s"), args->path);
#endif
	bsd.path = args->path;

	return chdir(p, &bsd);
}

int
linux_chmod(struct proc *p, struct linux_chmod_args *args)
{
	struct chmod_args bsd;
	caddr_t sg;

	sg = stackgap_init();
	CHECKALTEXIST(p, &sg, args->path);

#ifdef DEBUG
	if (ldebug(chmod))
		printf(ARGS(chmod, "%s, %d"), args->path, args->mode);
#endif
	bsd.path = args->path;
	bsd.mode = args->mode;

	return chmod(p, &bsd);
}

int
linux_mkdir(struct proc *p, struct linux_mkdir_args *args)
{
	struct mkdir_args bsd;
	caddr_t sg;

	sg = stackgap_init();
	CHECKALTCREAT(p, &sg, args->path);

#ifdef DEBUG
	if (ldebug(mkdir))
		printf(ARGS(mkdir, "%s, %d"), args->path, args->mode);
#endif
	bsd.path = args->path;
	bsd.mode = args->mode;

	return mkdir(p, &bsd);
}

int
linux_rmdir(struct proc *p, struct linux_rmdir_args *args)
{
	struct rmdir_args bsd;
	caddr_t sg;

	sg = stackgap_init();
	CHECKALTEXIST(p, &sg, args->path);

#ifdef DEBUG
	if (ldebug(rmdir))
		printf(ARGS(rmdir, "%s"), args->path);
#endif
	bsd.path = args->path;

	return rmdir(p, &bsd);
}

int
linux_rename(struct proc *p, struct linux_rename_args *args)
{
	struct rename_args bsd;
	caddr_t sg;

	sg = stackgap_init();
	CHECKALTEXIST(p, &sg, args->from);
	CHECKALTCREAT(p, &sg, args->to);

#ifdef DEBUG
	if (ldebug(rename))
		printf(ARGS(rename, "%s, %s"), args->from, args->to);
#endif
	bsd.from = args->from;
	bsd.to = args->to;

	return rename(p, &bsd);
}

int
linux_symlink(struct proc *p, struct linux_symlink_args *args)
{
	struct symlink_args bsd;
	caddr_t sg;

	sg = stackgap_init();
	CHECKALTEXIST(p, &sg, args->path);
	CHECKALTCREAT(p, &sg, args->to);

#ifdef DEBUG
	if (ldebug(symlink))
		printf(ARGS(symlink, "%s, %s"), args->path, args->to);
#endif
	bsd.path = args->path;
	bsd.link = args->to;

	return symlink(p, &bsd);
}

int
linux_readlink(struct proc *p, struct linux_readlink_args *args)
{
	struct readlink_args bsd;
	caddr_t sg;

	sg = stackgap_init();
	CHECKALTEXIST(p, &sg, args->name);

#ifdef DEBUG
	if (ldebug(readlink))
		printf(ARGS(readlink, "%s, %p, %d"),
		    args->name, (void *)args->buf, args->count);
#endif
	bsd.path = args->name;
	bsd.buf = args->buf;
	bsd.count = args->count;

	return readlink(p, &bsd);
}

int
linux_truncate(struct proc *p, struct linux_truncate_args *args)
{
	struct truncate_args bsd;
	caddr_t sg;

	sg = stackgap_init();
	CHECKALTEXIST(p, &sg, args->path);

#ifdef DEBUG
	if (ldebug(truncate))
		printf(ARGS(truncate, "%s, %ld"), args->path,
		    (long)args->length);
#endif
	bsd.path = args->path;
	bsd.length = args->length;

	return truncate(p, &bsd);
}

int
linux_link(struct proc *p, struct linux_link_args *args)
{
    struct link_args bsd;
    caddr_t sg;

    sg = stackgap_init();
    CHECKALTEXIST(p, &sg, args->path);
    CHECKALTCREAT(p, &sg, args->to);

#ifdef DEBUG
	if (ldebug(link))
		printf(ARGS(link, "%s, %s"), args->path, args->to);
#endif

    bsd.path = args->path;
    bsd.link = args->to;

    return link(p, &bsd);
}

#ifndef __alpha__
int
linux_fdatasync(p, uap)
	struct proc *p;
	struct linux_fdatasync_args *uap;
{
	struct fsync_args bsd;

	bsd.fd = uap->fd;
	return fsync(p, &bsd);
}
#endif /*!__alpha__*/

int
linux_pread(p, uap)
	struct proc *p;
	struct linux_pread_args *uap;
{
	struct pread_args bsd;

	bsd.fd = uap->fd;
	bsd.buf = uap->buf;
	bsd.nbyte = uap->nbyte;
	bsd.offset = uap->offset;
	return pread(p, &bsd);
}

int
linux_pwrite(p, uap)
	struct proc *p;
	struct linux_pwrite_args *uap;
{
	struct pwrite_args bsd;

	bsd.fd = uap->fd;
	bsd.buf = uap->buf;
	bsd.nbyte = uap->nbyte;
	bsd.offset = uap->offset;
	return pwrite(p, &bsd);
}

int
linux_mount(struct proc *p, struct linux_mount_args *args)
{
	struct ufs_args ufs;
        char fstypename[MFSNAMELEN];
        char mntonname[MNAMELEN], mntfromname[MNAMELEN];
	int error;
	int fsflags;
	const char *fstype;
	void *fsdata;

        error = copyinstr(args->filesystemtype, fstypename, MFSNAMELEN - 1,
	    NULL);
	if (error)
                return (error);
        error = copyinstr(args->specialfile, mntfromname, MFSNAMELEN - 1, NULL);
	if (error)
                return (error);
        error = copyinstr(args->dir, mntonname, MFSNAMELEN - 1, NULL);
	if (error)
                return (error);

#ifdef DEBUG
	if (ldebug(mount))
		printf(ARGS(mount, "%s, %s, %s"),
		    fstypename, mntfromname, mntonname);
#endif

	if (strcmp(fstypename, "ext2") == 0) {
		fstype = "ext2fs";
		fsdata = &ufs;
		ufs.fspec = mntfromname;
#define DEFAULT_ROOTID		-2
		ufs.export.ex_root = DEFAULT_ROOTID;
		ufs.export.ex_flags =
		    args->rwflag & LINUX_MS_RDONLY ? MNT_EXRDONLY : 0;
	} else if (strcmp(fstypename, "proc") == 0) {
		fstype = "linprocfs";
		fsdata = NULL;
	} else {
		return (ENODEV);
	}

	fsflags = 0;

	if ((args->rwflag & 0xffff0000) == 0xc0ed0000) {
		/*
		 * Linux SYNC flag is not included; the closest equivalent
		 * FreeBSD has is !ASYNC, which is our default.
		 */
		if (args->rwflag & LINUX_MS_RDONLY)
			fsflags |= MNT_RDONLY; 
		if (args->rwflag & LINUX_MS_NOSUID)
			fsflags |= MNT_NOSUID; 
		if (args->rwflag & LINUX_MS_NODEV)
			fsflags |= MNT_NODEV; 
		if (args->rwflag & LINUX_MS_NOEXEC)
			fsflags |= MNT_NOEXEC; 
		if (args->rwflag & LINUX_MS_REMOUNT)
			fsflags |= MNT_UPDATE; 
	}

	return (vfs_mount(p, fstype, mntonname, fsflags, fsdata));
}

int
linux_oldumount(struct proc *p, struct linux_oldumount_args *args)
{
	struct linux_umount_args args2;

	args2.path = args->path;
	args2.flags = 0;
	return (linux_umount(p, &args2));
}

int
linux_umount(struct proc *p, struct linux_umount_args *args)
{
	struct unmount_args bsd;

	bsd.path = args->path;
	bsd.flags = args->flags;	/* XXX correct? */
	return (unmount(p, &bsd));
}

/*
 * fcntl family of syscalls
 */

struct l_flock {
	l_short		l_type;
	l_short		l_whence;
	l_off_t		l_start;
	l_off_t		l_len;
	l_pid_t		l_pid;
};

static void
linux_to_bsd_flock(struct l_flock *linux_flock, struct flock *bsd_flock)
{
	switch (linux_flock->l_type) {
	case LINUX_F_RDLCK:
		bsd_flock->l_type = F_RDLCK;
		break;
	case LINUX_F_WRLCK:
		bsd_flock->l_type = F_WRLCK;
		break;
	case LINUX_F_UNLCK:
		bsd_flock->l_type = F_UNLCK;
		break;
	default:
		bsd_flock->l_type = -1;
		break;
	}
	bsd_flock->l_whence = linux_flock->l_whence;
	bsd_flock->l_start = (off_t)linux_flock->l_start;
	bsd_flock->l_len = (off_t)linux_flock->l_len;
	bsd_flock->l_pid = (pid_t)linux_flock->l_pid;
}

static void
bsd_to_linux_flock(struct flock *bsd_flock, struct l_flock *linux_flock)
{
	switch (bsd_flock->l_type) {
	case F_RDLCK:
		linux_flock->l_type = LINUX_F_RDLCK;
		break;
	case F_WRLCK:
		linux_flock->l_type = LINUX_F_WRLCK;
		break;
	case F_UNLCK:
		linux_flock->l_type = LINUX_F_UNLCK;
		break;
	}
	linux_flock->l_whence = bsd_flock->l_whence;
	linux_flock->l_start = (l_off_t)bsd_flock->l_start;
	linux_flock->l_len = (l_off_t)bsd_flock->l_len;
	linux_flock->l_pid = (l_pid_t)bsd_flock->l_pid;
}

#if defined(__i386__)
struct l_flock64 {
	l_short		l_type;
	l_short		l_whence;
	l_loff_t	l_start;
	l_loff_t	l_len;
	l_pid_t		l_pid;
};

static void
linux_to_bsd_flock64(struct l_flock64 *linux_flock, struct flock *bsd_flock)
{
	switch (linux_flock->l_type) {
	case LINUX_F_RDLCK:
		bsd_flock->l_type = F_RDLCK;
		break;
	case LINUX_F_WRLCK:
		bsd_flock->l_type = F_WRLCK;
		break;
	case LINUX_F_UNLCK:
		bsd_flock->l_type = F_UNLCK;
		break;
	default:
		bsd_flock->l_type = -1;
		break;
	}
	bsd_flock->l_whence = linux_flock->l_whence;
	bsd_flock->l_start = (off_t)linux_flock->l_start;
	bsd_flock->l_len = (off_t)linux_flock->l_len;
	bsd_flock->l_pid = (pid_t)linux_flock->l_pid;
}

static void
bsd_to_linux_flock64(struct flock *bsd_flock, struct l_flock64 *linux_flock)
{
	switch (bsd_flock->l_type) {
	case F_RDLCK:
		linux_flock->l_type = LINUX_F_RDLCK;
		break;
	case F_WRLCK:
		linux_flock->l_type = LINUX_F_WRLCK;
		break;
	case F_UNLCK:
		linux_flock->l_type = LINUX_F_UNLCK;
		break;
	}
	linux_flock->l_whence = bsd_flock->l_whence;
	linux_flock->l_start = (l_loff_t)bsd_flock->l_start;
	linux_flock->l_len = (l_loff_t)bsd_flock->l_len;
	linux_flock->l_pid = (l_pid_t)bsd_flock->l_pid;
}
#endif /* __i386__ */

#if defined(__alpha__)
#define	linux_fcntl64_args	linux_fcntl_args
#endif

static int
fcntl_common(struct proc *p, struct linux_fcntl64_args *args)
{
	struct fcntl_args fcntl_args;
	struct filedesc *fdp;
	struct file *fp;
	int error, result;

	fcntl_args.fd = args->fd;

	switch (args->cmd) {
	case LINUX_F_DUPFD:
		fcntl_args.cmd = F_DUPFD;
		fcntl_args.arg = args->arg;
		return (fcntl(p, &fcntl_args));

	case LINUX_F_GETFD:
		fcntl_args.cmd = F_GETFD;
		return (fcntl(p, &fcntl_args));

	case LINUX_F_SETFD:
		fcntl_args.cmd = F_SETFD;
		fcntl_args.arg = args->arg;
		return (fcntl(p, &fcntl_args));

	case LINUX_F_GETFL:
		fcntl_args.cmd = F_GETFL;
		error = fcntl(p, &fcntl_args);
		result = p->p_retval[0];
		p->p_retval[0] = 0;
		if (result & O_RDONLY)
			p->p_retval[0] |= LINUX_O_RDONLY;
		if (result & O_WRONLY)
			p->p_retval[0] |= LINUX_O_WRONLY;
		if (result & O_RDWR)
			p->p_retval[0] |= LINUX_O_RDWR;
		if (result & O_NDELAY)
			p->p_retval[0] |= LINUX_O_NONBLOCK;
		if (result & O_APPEND)
			p->p_retval[0] |= LINUX_O_APPEND;
		if (result & O_FSYNC)
			p->p_retval[0] |= LINUX_O_SYNC;
		if (result & O_ASYNC)
			p->p_retval[0] |= LINUX_FASYNC;
		return (error);

	case LINUX_F_SETFL:
		fcntl_args.arg = 0;
		if (args->arg & LINUX_O_NDELAY)
			fcntl_args.arg |= O_NONBLOCK;
		if (args->arg & LINUX_O_APPEND)
			fcntl_args.arg |= O_APPEND;
		if (args->arg & LINUX_O_SYNC)
			fcntl_args.arg |= O_FSYNC;
		if (args->arg & LINUX_FASYNC)
			fcntl_args.arg |= O_ASYNC;
		fcntl_args.cmd = F_SETFL;
		return (fcntl(p, &fcntl_args));

	case LINUX_F_GETOWN:
		fcntl_args.cmd = F_GETOWN;
		return (fcntl(p, &fcntl_args));

	case LINUX_F_SETOWN:
		/*
		 * XXX some Linux applications depend on F_SETOWN having no
		 * significant effect for pipes (SIGIO is not delivered for
		 * pipes under Linux-2.2.35 at least).
		 */
		fdp = p->p_fd;
		if ((u_int)args->fd >= fdp->fd_nfiles ||
		    (fp = fdp->fd_ofiles[args->fd]) == NULL)
			return (EBADF);
		if (fp->f_type == DTYPE_PIPE)
			return (EINVAL);

		fcntl_args.cmd = F_SETOWN;
		fcntl_args.arg = args->arg;
		return (fcntl(p, &fcntl_args));
	}

	return (EINVAL);
}

int
linux_fcntl(struct proc *p, struct linux_fcntl_args *args)
{
	struct linux_fcntl64_args args64;
	struct fcntl_args fcntl_args;
	struct l_flock linux_flock;
	struct flock *bsd_flock;
	int error;
	caddr_t sg;

	sg = stackgap_init();
	bsd_flock = (struct flock *)stackgap_alloc(&sg, sizeof(bsd_flock));

#ifdef DEBUG
	if (ldebug(fcntl))
		printf(ARGS(fcntl, "%d, %08x, *"), args->fd, args->cmd);
#endif

	switch (args->cmd) {
	case LINUX_F_GETLK:
		error = copyin((caddr_t)args->arg, &linux_flock,
		    sizeof(linux_flock));
		if (error)
			return (error);
		linux_to_bsd_flock(&linux_flock, bsd_flock);
		fcntl_args.fd = args->fd;
		fcntl_args.cmd = F_GETLK;
		fcntl_args.arg = (long)bsd_flock;
		error = fcntl(p, &fcntl_args);
		if (error)
			return (error);
		bsd_to_linux_flock(bsd_flock, &linux_flock);
		return (copyout(&linux_flock, (caddr_t)args->arg,
		    sizeof(linux_flock)));

	case LINUX_F_SETLK:
		error = copyin((caddr_t)args->arg, &linux_flock,
		    sizeof(linux_flock));
		if (error)
			return (error);
		linux_to_bsd_flock(&linux_flock, bsd_flock);
		fcntl_args.fd = args->fd;
		fcntl_args.cmd = F_SETLK;
		fcntl_args.arg = (long)bsd_flock;
		return (fcntl(p, &fcntl_args));

	case LINUX_F_SETLKW:
		error = copyin((caddr_t)args->arg, &linux_flock,
		    sizeof(linux_flock));
		if (error)
			return (error);
		linux_to_bsd_flock(&linux_flock, bsd_flock);
		fcntl_args.fd = args->fd;
		fcntl_args.cmd = F_SETLKW;
		fcntl_args.arg = (long)bsd_flock;
		return (fcntl(p, &fcntl_args));
	}

	args64.fd = args->fd;
	args64.cmd = args->cmd;
	args64.arg = args->arg;
	return (fcntl_common(p, &args64));
}

#if defined(__i386__)
int
linux_fcntl64(struct proc *p, struct linux_fcntl64_args *args)
{
	struct fcntl_args fcntl_args;
	struct l_flock64 linux_flock;
	struct flock *bsd_flock;
	int error;
	caddr_t sg;

	sg = stackgap_init();
	bsd_flock = (struct flock *)stackgap_alloc(&sg, sizeof(bsd_flock));

#ifdef DEBUG
	if (ldebug(fcntl64))
		printf(ARGS(fcntl64, "%d, %08x, *"), args->fd, args->cmd);
#endif

	switch (args->cmd) {
	case LINUX_F_GETLK:
		error = copyin((caddr_t)args->arg, &linux_flock,
		    sizeof(linux_flock));
		if (error)
			return (error);
		linux_to_bsd_flock64(&linux_flock, bsd_flock);
		fcntl_args.fd = args->fd;
		fcntl_args.cmd = F_GETLK;
		fcntl_args.arg = (long)bsd_flock;
		error = fcntl(p, &fcntl_args);
		if (error)
			return (error);
		bsd_to_linux_flock64(bsd_flock, &linux_flock);
		return (copyout(&linux_flock, (caddr_t)args->arg,
		    sizeof(linux_flock)));

	case LINUX_F_SETLK:
		error = copyin((caddr_t)args->arg, &linux_flock,
		    sizeof(linux_flock));
		if (error)
			return (error);
		linux_to_bsd_flock64(&linux_flock, bsd_flock);
		fcntl_args.fd = args->fd;
		fcntl_args.cmd = F_SETLK;
		fcntl_args.arg = (long)bsd_flock;
		return (fcntl(p, &fcntl_args));

	case LINUX_F_SETLKW:
		error = copyin((caddr_t)args->arg, &linux_flock,
		    sizeof(linux_flock));
		if (error)
			return (error);
		linux_to_bsd_flock64(&linux_flock, bsd_flock);
		fcntl_args.fd = args->fd;
		fcntl_args.cmd = F_SETLKW;
		fcntl_args.arg = (long)bsd_flock;
		return (fcntl(p, &fcntl_args));
	}

	return (fcntl_common(p, args));
}
#endif /* __i386__ */