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1.1 root 1: /*
2:
1.1.1.3 root 3: Copyright 1990,1991,1992 Eric R. Smith.
4:
1.1.1.5 ! root 5: Copyright 1992,1993,1994 Atari Corp.
1.1.1.3 root 6:
7: All rights reserved.
1.1 root 8:
9: */
10:
11:
12:
13: /*
14:
15: * various file system interface things
16:
17: */
18:
19:
20:
21: #include "mint.h"
22:
23:
24:
1.1.1.3 root 25: #define PATH2COOKIE_DB(x) TRACE(x)
26:
27:
28:
1.1 root 29: FILESYS *active_fs;
30:
31: FILESYS *drives[NUM_DRIVES];
32:
1.1.1.3 root 33: extern FILESYS tos_filesys; /* declaration needed for debugging only */
34:
1.1 root 35:
36:
1.1.1.2 root 37: /* "aliased" drives are different names
38:
39: * for real drives/directories
40:
41: * if drive d is an alias for c:\usr,
42:
43: * then alias_drv[3] == 2 (the real
44:
45: * drive) and aliases has bit (1L << 3)
46:
47: * set.
48:
49: * NOTE: if aliasdrv[d] is 0, then d is not an aliased drive,
50:
51: * otherwise d is aliased to drive aliasdrv[d]-1
52:
53: * (e.g. if drive A: is aliased to B:\FOO, then
54:
55: * aliasdrv[0] == 'B'-'A'+1 == 2). Always remember to
56:
57: * compensate for the extra 1 when dereferencing aliasdrv!
58:
59: */
60:
61: int aliasdrv[NUM_DRIVES];
62:
63:
64:
1.1 root 65: FILEPTR *flist; /* a list of free file pointers */
66:
67:
68:
69: char follow_links[1]; /* dummy "name" used as a parameter to path2cookie */
70:
71:
72:
73: /* vector of valid drives, according to GEMDOS */
74:
75: /* note that this isn't necessarily the same as what the BIOS thinks of
76:
77: * as valid
78:
79: */
80:
81: long dosdrvs;
82:
83:
84:
85: /*
86:
87: * Initialize a specific drive. This is called whenever a new drive
88:
89: * is accessed, or when media change occurs on an old drive.
90:
91: * Assumption: at this point, active_fs is a valid pointer
92:
93: * to a list of file systems.
94:
95: */
96:
97:
98:
99: /* table of processes holding locks on drives */
100:
101: extern PROC *dlockproc[]; /* in dosdir.c */
102:
103:
104:
105: void
106:
107: init_drive(i)
108:
109: int i;
110:
111: {
112:
113: long r;
114:
115: FILESYS *fs;
116:
117: fcookie root_dir;
118:
119:
120:
1.1.1.2 root 121: TRACE(("init_drive(%c)", i+'A'));
1.1 root 122:
123:
124:
125: drives[i] = 0; /* no file system */
126:
127: if (i >= 0 && i < NUM_DRIVES) {
128:
129: if (dlockproc[i]) return;
130:
131: }
132:
133:
134:
135: for (fs = active_fs; fs; fs = fs->next) {
136:
137: r = (*fs->root)(i, &root_dir);
138:
139: if (r == 0) {
140:
141: drives[i] = root_dir.fs;
142:
1.1.1.3 root 143: release_cookie(&root_dir);
144:
1.1 root 145: break;
146:
147: }
148:
149: }
150:
151: }
152:
153:
154:
155: /*
156:
157: * initialize the file system
158:
159: */
160:
161:
162:
163: #define NUMFPS 40 /* initial number of file pointers */
164:
165:
166:
167: void
168:
169: init_filesys()
170:
171: {
172:
173: static FILEPTR initial[NUMFPS+1];
174:
175: int i;
176:
177: extern FILESYS tos_filesys, bios_filesys, pipe_filesys,
178:
179: proc_filesys, uni_filesys;
180:
181:
182:
183: /* get the vector of connected GEMDOS drives */
184:
185: dosdrvs = Dsetdrv(Dgetdrv()) | drvmap();
186:
187:
188:
189: /* set up some initial file pointers */
190:
191: for (i = 0; i < NUMFPS; i++) {
192:
193: initial[i].devinfo = (ulong) (&initial[i+1]);
194:
195: }
196:
197: initial[NUMFPS].devinfo = 0;
198:
199: flist = initial;
200:
201:
202:
203: /* set up the file systems */
204:
205: tos_filesys.next = 0;
206:
207: bios_filesys.next = &tos_filesys;
208:
209: pipe_filesys.next = &bios_filesys;
210:
211: proc_filesys.next = &pipe_filesys;
212:
213: uni_filesys.next = &proc_filesys;
214:
215:
216:
217: active_fs = &uni_filesys;
218:
219:
220:
221: /* initialize the BIOS file system */
222:
223: biosfs_init();
224:
225:
226:
227: /* initialize the unified file system */
228:
229: unifs_init();
230:
231: }
232:
233:
234:
235: /*
236:
237: * load file systems from disk
238:
239: * this routine is called after process 0 is set up, but before any user
240:
241: * processes are run
242:
243: *
244:
245: * NOTE that a number of directory changes take place here: we look first
246:
1.1.1.4 root 247: * in the current directory, then in the directory \mint.
1.1 root 248:
249: */
250:
251:
252:
1.1.1.2 root 253: typedef FILESYS * ARGS_ON_STACK (*FSFUNC) P_((struct kerinfo *));
1.1 root 254:
255:
256:
1.1.1.4 root 257: /* uk: made this lie outside of functions, as load_filesys() and
258:
259: * load_devdriver() need access to it.
260:
261: */
262:
263: #define NPATHS 3
264:
265: static const char *ext_paths[NPATHS] = {"", "\\MINT", "\\MULTITOS"};
266:
267:
268:
269:
270:
1.1 root 271: void
272:
273: load_filesys()
274:
275: {
276:
277: long r;
278:
279: BASEPAGE *b;
280:
281: FILESYS *fs;
282:
283: FSFUNC initf;
284:
285: static DTABUF dta;
286:
287: int i;
288:
289: extern struct kerinfo kernelinfo; /* in main.c */
290:
1.1.1.2 root 291: char curpath[PATH_MAX];
292:
1.1.1.3 root 293: MEMREGION *xfsreg;
294:
1.1 root 295:
296:
297: curproc->dta = &dta;
298:
1.1.1.2 root 299: d_getpath(curpath,0);
300:
1.1 root 301:
302:
303: for (i = 0; i < NPATHS; i++) {
304:
1.1.1.4 root 305: if (*ext_paths[i]) {
1.1.1.2 root 306:
307: /* don't bother checking the current directory twice! */
308:
1.1.1.4 root 309: if (!stricmp(ext_paths[i],curpath))
1.1.1.2 root 310:
311: r = -1;
312:
313: else
314:
1.1.1.4 root 315: r = d_setpath(ext_paths[i]);
1.1.1.2 root 316:
317: }
318:
319: else
320:
321: r = 0;
322:
323:
324:
325: if (r == 0)
326:
327: r = f_sfirst("*.xfs", 0);
1.1 root 328:
329:
330:
331: while (r == 0) {
332:
333: b = (BASEPAGE *)p_exec(3, dta.dta_name, (char *)"", (char *)0);
334:
335: if ( ((long)b) < 0 ) {
336:
1.1.1.2 root 337: DEBUG(("Error loading file system %s", dta.dta_name));
338:
339: r = f_snext();
1.1 root 340:
341: continue;
342:
343: }
344:
345: /* we leave a little bit of slop at the end of the loaded stuff */
346:
347: m_shrink(0, (virtaddr)b, 512 + b->p_tlen + b->p_dlen + b->p_blen);
348:
349: initf = (FSFUNC)b->p_tbase;
350:
1.1.1.2 root 351: TRACE(("initializing %s", dta.dta_name));
1.1 root 352:
1.1.1.2 root 353: fs = (*initf)(&kernelinfo);
1.1 root 354:
355:
356:
357: if (fs) {
358:
1.1.1.2 root 359: TRACE(("%s loaded OK", dta.dta_name));
1.1 root 360:
1.1.1.3 root 361: /* put the loaded XFS into super accesible memory */
362:
363: xfsreg = addr2region( (long) b );
364:
365: mark_region(xfsreg, PROT_S);
366:
1.1.1.4 root 367:
368:
1.1.1.3 root 369: /* link it into the list of drivers */
370:
1.1.1.4 root 371: /* uk: but only if it has not installed itself via Dcntl()
372:
373: * after checking if file system is already installed,
374:
375: * so we know for sure that each file system in at most
376:
377: * once in the chain (important for removal!)
378:
379: * also note: this doesn't preclude loading two different
380:
381: * instances of the same file system driver, e.g. it's perfectly
382:
383: * OK to have a "cdromy1.xfs" and "cdromz2.xfs"; the check below
384:
385: * just makes sure that a given instance of a file system is
386:
387: * installed at most once. I.e., it prevents cdromy1.xfs from being
388:
389: * installed twice.
390:
391: */
1.1 root 392:
1.1.1.4 root 393: if ((FILESYS*)1L != fs) {
394:
395: FILESYS *f = active_fs;
396:
397: for (; f; f = f->next)
398:
399: if (f == fs)
400:
401: break;
402:
403: if (!f) { /* we ran completly through the list */
404:
405: fs->next = active_fs;
406:
407: active_fs = fs;
408:
409: }
410:
411: }
1.1 root 412:
413: } else {
414:
1.1.1.2 root 415: DEBUG(("%s returned null", dta.dta_name));
1.1 root 416:
1.1.1.3 root 417: m_free((virtaddr)b);
418:
1.1 root 419: }
420:
421: r = f_snext();
422:
423: }
424:
425: }
426:
427:
428:
1.1.1.4 root 429: #if 0
430:
1.1 root 431: /* here, we invalidate all old drives EXCEPT for ones we're already using (at
432:
433: * this point, only the bios devices should be open)
434:
435: * this gives newly loaded file systems a chance to replace the
436:
437: * default tosfs.c
438:
439: */
440:
441: for (i = 0; i < NUM_DRIVES; i++) {
442:
443: if (d_lock(1, i) == 0) /* lock if possible */
444:
445: d_lock(0, i); /* and then unlock */
446:
447: }
448:
1.1.1.4 root 449: #endif
450:
1.1 root 451: }
452:
453:
454:
1.1.1.4 root 455:
456:
457: /*
458:
459: * uk: load device driver in files called *.xdd (external device driver)
460:
461: * from disk
462:
463: * maybe this should go into biosfs.c ??
464:
465: *
466:
467: * this routine is called after process 0 is set up, but before any user
468:
469: * processes are run, but before the loadable file systems come in,
470:
471: * so they can make use of external device drivers
472:
473: *
474:
475: * NOTE that a number of directory changes take place here: we look first
476:
477: * in the current directory, then in the directory \mint, and finally
478:
479: * the d_lock() calls force us into the root directory.
480:
481: * ??? what d_lock() calls ???
482:
483: */
484:
485:
486:
487: typedef DEVDRV * ARGS_ON_STACK (*DEVFUNC) P_((struct kerinfo *));
488:
489:
490:
491: #define DEV_SELFINST ((DEVDRV*)1L) /* dev driver did dcntl() already */
492:
493:
494:
495: void
496:
497: load_devdriver()
498:
499: {
500:
501: long r;
502:
503: BASEPAGE *b;
504:
505: DEVDRV *dev;
506:
507: DEVFUNC initf;
508:
509: struct dev_descr the_dev;
510:
511: static DTABUF dta;
512:
513: int i;
514:
515: extern struct kerinfo kernelinfo; /* in main.c */
516:
517: char curpath[PATH_MAX];
518:
519: char dev_name[PATH_MAX]; /* a bit long, but one never knows... */
520:
521: char ch, *p;
522:
523: MEMREGION *xddreg;
524:
525:
526:
527:
528:
529: curproc->dta = &dta;
530:
531: d_getpath(curpath,0);
532:
533:
534:
535: for (i = 0; i < NPATHS; i++) {
536:
537: if (*ext_paths[i]) {
538:
539: /* don't bother checking the current directory twice! */
540:
541: if (!stricmp(ext_paths[i],curpath))
542:
543: r = -1;
544:
545: else
546:
547: r = d_setpath(ext_paths[i]);
548:
549: }
550:
551: else
552:
553: r = 0;
554:
555:
556:
557: if (r == 0)
558:
559: r = f_sfirst("*.xdd", 0);
560:
561:
562:
563: while (r == 0) {
564:
565: b = (BASEPAGE *)p_exec(3, dta.dta_name, (char *)"", (char *)0);
566:
567: if ( ((long)b) < 0 ) {
568:
569: DEBUG(("Error loading device driver %s", dta.dta_name));
570:
571: r = f_snext();
572:
573: continue;
574:
575: }
576:
577: /* we leave a little bit of slop at the end of the loaded stuff */
578:
579: m_shrink(0, (virtaddr)b, 512 + b->p_tlen + b->p_dlen + b->p_blen);
580:
581: initf = (DEVFUNC)b->p_tbase;
582:
583: TRACE(("initializing %s", dta.dta_name));
584:
585: dev = (*initf)(&kernelinfo);
586:
587:
588:
589: if (dev) {
590:
591: if (DEV_SELFINST != dev) {
592:
593: /* we need to install the device driver ourselves */
594:
595: the_dev.driver = dev;
596:
597: the_dev.dinfo = 0;
598:
599: the_dev.flags = 0;
600:
601: the_dev.tty = (struct tty*)0L;
602:
603: the_dev.reserved[0] = the_dev.reserved[1] = 0;
604:
605: the_dev.reserved[2] = the_dev.reserved[3] = 0;
606:
607: p = dta.dta_name;
608:
1.1.1.5 ! root 609: /* copy the dev. driver name, converting to lower case */
! 610:
! 611: while (*p && *p != '.') {
! 612:
! 613: *p = tolower(*p);
! 614:
! 615: p++;
! 616:
! 617: }
1.1.1.4 root 618:
619: ch = *p;
620:
621: *p = '\0'; /* we dont want the extension */
622:
623: strcpy(dev_name, "u:\\dev\\");
624:
625: strcat(dev_name, dta.dta_name);
626:
627: *p = ch;
628:
629: r = d_cntl(DEV_INSTALL, dev_name, (long)&the_dev);
630:
631: if (r <= 0) {
632:
633: DEBUG(("Error installing device driver %s", dta.dta_name));
634:
635: r = f_snext();
636:
637: continue;
638:
639: }
640:
641: }
642:
643: TRACE(("%s loaded OK", dta.dta_name));
644:
645: /* put the loaded XDD into super accesible memory */
646:
647: xddreg = addr2region( (long) b );
648:
649: mark_region(xddreg, PROT_S);
650:
651: } else {
652:
653: DEBUG(("%s returned null", dta.dta_name));
654:
655: m_free((virtaddr)b);
656:
657: }
658:
659: r = f_snext();
660:
661: }
662:
663: }
664:
665: }
666:
667:
668:
669:
670:
1.1 root 671: void
672:
673: close_filesys()
674:
675: {
676:
677: PROC *p;
678:
679: FILEPTR *f;
680:
681: int i;
682:
683:
684:
1.1.1.2 root 685: TRACE(("close_filesys"));
1.1 root 686:
687: /* close every open file */
688:
689: for (p = proclist; p; p = p->gl_next) {
690:
691: for (i = MIN_HANDLE; i < MAX_OPEN; i++) {
692:
693: if ( (f = p->handle[i]) != 0) {
694:
695: if (p->wait_q == TSR_Q || p->wait_q == ZOMBIE_Q)
696:
697: ALERT("Open file for dead process?");
698:
699: do_pclose(p, f);
700:
701: }
702:
703: }
704:
705: }
706:
707: }
708:
709:
710:
711: /*
712:
713: * "media change" routine: called when a media change is detected on device
714:
715: * d, which may or may not be a BIOS device. All handles associated with
716:
717: * the device are closed, and all directories invalidated. This routine
718:
719: * does all the dirty work, and is called automatically when
720:
721: * disk_changed detects a media change.
722:
723: */
724:
725:
726:
1.1.1.2 root 727: void ARGS_ON_STACK
1.1 root 728:
729: changedrv(d)
730:
731: unsigned d;
732:
733: {
734:
735: PROC *p;
736:
737: int i;
738:
739: FILEPTR *f;
740:
741: FILESYS *fs;
742:
1.1.1.3 root 743: SHTEXT *stext;
744:
745: extern SHTEXT *text_reg; /* in mem.c */
746:
1.1 root 747: DIR *dirh;
748:
749: fcookie dir;
750:
1.1.1.5 ! root 751: int warned = (d & 0xf000) == PROC_RDEV_BASE;
1.1 root 752:
1.1.1.2 root 753: long r;
754:
755:
756:
757: /* if an aliased drive, change the *real* device */
758:
759: if (d < NUM_DRIVES && aliasdrv[d]) {
760:
761: d = aliasdrv[d] - 1; /* see NOTE above */
762:
763: }
1.1 root 764:
765:
766:
767: /* re-initialize the device, if it was a BIOS device */
768:
769: if (d < NUM_DRIVES) {
770:
771: fs = drives[d];
772:
773: if (fs) {
774:
775: (void)(*fs->dskchng)(d);
776:
777: }
778:
779: init_drive(d);
780:
781: }
782:
783:
784:
785: for (p = proclist; p; p = p->gl_next) {
786:
787: /* invalidate all open files on this device */
788:
789: for (i = MIN_HANDLE; i < MAX_OPEN; i++) {
790:
791: if (((f = p->handle[i]) != 0) && (f->fc.dev == d)) {
792:
793: if (!warned) {
794:
795: ALERT(
796:
797: "Files were open on a changed drive (0x%x)!", d);
798:
799: warned++;
800:
801: }
802:
803:
804:
805: /* we set f->dev to NULL to indicate to do_pclose that this is an
806:
807: * emergency close, and that it shouldn't try to make any
808:
809: * calls to the device driver since the file has gone away
810:
811: */
812:
813: f->dev = NULL;
814:
815: (void)do_pclose(p, f);
816:
1.1.1.2 root 817: /* we could just zero the handle, but this could lead to confusion if
818:
819: * a process doesn't realize that there's been a media change, Fopens
820:
821: * a new file, and gets the same handle back. So, we force the
822:
823: * handle to point to /dev/null.
824:
825: */
826:
827: p->handle[i] =
828:
829: do_open("U:\\DEV\\NULL", O_RDWR, 0, (XATTR *)0);
1.1 root 830:
831: }
832:
833: }
834:
835:
836:
837: /* terminate any active directory searches on the drive */
838:
839: for (i = 0; i < NUM_SEARCH; i++) {
840:
1.1.1.2 root 841: dirh = &p->srchdir[i];
1.1 root 842:
1.1.1.4 root 843: if (p->srchdta[i] && dirh->fc.fs && dirh->fc.dev == d) {
1.1 root 844:
1.1.1.2 root 845: TRACE(("closing search for process %d", p->pid));
846:
1.1.1.3 root 847: release_cookie(&dirh->fc);
848:
1.1 root 849: dirh->fc.fs = 0;
850:
1.1.1.2 root 851: p->srchdta[i] = 0;
1.1 root 852:
853: }
854:
855: }
856:
857:
858:
1.1.1.4 root 859: for (dirh = p->searches; dirh; dirh = dirh->next) {
860:
861: /* If this search is on the changed drive, release
862:
863: the cookie, but do *not* free it, since the
864:
865: user could later call closedir on it. */
866:
867: if (dirh->fc.fs && dirh->fc.dev == d) {
868:
869: release_cookie (&dirh->fc);
870:
871: dirh->fc.fs = 0;
872:
873: }
874:
875: }
876:
877:
878:
1.1 root 879: if (d >= NUM_DRIVES) continue;
880:
881:
882:
883: /* change any active directories on the device to the (new) root */
884:
885: fs = drives[d];
886:
887: if (fs) {
888:
889: r = (*fs->root)(d, &dir);
890:
891: if (r != E_OK) dir.fs = 0;
892:
893: } else {
894:
895: dir.fs = 0; dir.dev = d;
896:
897: }
898:
899:
900:
901: for (i = 0; i < NUM_DRIVES; i++) {
902:
1.1.1.3 root 903: if (p->root[i].dev == d) {
904:
905: release_cookie(&p->root[i]);
1.1 root 906:
1.1.1.3 root 907: dup_cookie(&p->root[i], &dir);
908:
909: }
1.1 root 910:
1.1.1.3 root 911: if (p->curdir[i].dev == d) {
1.1 root 912:
1.1.1.3 root 913: release_cookie(&p->curdir[i]);
914:
915: dup_cookie(&p->curdir[i], &dir);
916:
917: }
918:
919: }
920:
921: release_cookie(&dir);
922:
923: }
924:
925:
926:
927: /* free any file descriptors associated with shared text regions */
928:
929: for (stext = text_reg; stext; stext = stext->next) {
930:
931: f = stext->f;
932:
933: if (f->fc.dev == d) {
934:
935: f->dev = NULL;
936:
937: do_pclose(rootproc, f);
938:
939: stext->f = 0;
1.1 root 940:
941: }
942:
943: }
944:
945: }
946:
947:
948:
949: /*
950:
951: * check for media change: if the drive has changed, call changedrv to
952:
953: * invalidate any open files and file handles associated with it, and
954:
955: * call the file system's media change routine.
956:
1.1.1.4 root 957: * returns: 0 if no change, 1 if change, negative number for error
1.1 root 958:
959: */
960:
961:
962:
963: int
964:
965: disk_changed(d)
966:
967: int d;
968:
969: {
970:
971: short r;
972:
973: FILESYS *fs;
974:
975: static char tmpbuf[8192];
976:
977:
978:
979: /* for now, only check BIOS devices */
980:
981: if (d < 0 || d >= NUM_DRIVES)
982:
983: return 0;
984:
1.1.1.2 root 985: /* watch out for aliased drives */
986:
987: if (aliasdrv[d]) {
988:
989: d = aliasdrv[d] - 1;
990:
991: if (d < 0 || d >= NUM_DRIVES)
992:
993: return 0;
994:
995: }
996:
1.1 root 997:
998:
999: /* has the drive been initialized yet? If not, then initialize it and return
1000:
1001: * "no change"
1002:
1003: */
1004:
1.1.1.2 root 1005: fs = drives[d];
1006:
1007: if (!fs) {
1.1 root 1008:
1.1.1.2 root 1009: TRACE(("drive %c not yet initialized", d+'A'));
1.1 root 1010:
1011: changedrv(d);
1012:
1013: return 0;
1014:
1015: }
1016:
1017:
1018:
1019: /* We have to do this stuff no matter what, because someone may have installed
1020:
1021: * vectors to force a media change...
1022:
1023: * PROBLEM: AHDI may get upset if the drive isn't valid.
1024:
1025: * SOLUTION: don't change the default PSEUDODRIVES setting!
1026:
1027: */
1028:
1.1.1.4 root 1029:
1030:
1031: TRACE(("calling mediach(%d)",d));
1032:
1033: r = (int)mediach(d);
1034:
1035: TRACE(("mediach(%d) == %d", d, r));
1036:
1037:
1038:
1.1.1.5 ! root 1039: if (r < 0) {
! 1040:
! 1041: /* KLUDGE: some .XFS drivers don't install BIOS vectors, and so we'll
! 1042:
! 1043: * always get EUNDEV back from them. This isn't recommended (since there
! 1044:
! 1045: * are other programs than MiNT that may ask for BIOS functions from
! 1046:
! 1047: * any installed drives). This is a temporary work-around until those
! 1048:
! 1049: * .XFSes are changed to either install BIOS vectors or to use the
! 1050:
! 1051: * new U: Dcntl() calls to install themselves.
! 1052:
! 1053: * Note that EUNDEV must be tested for drives A-C, or else booting may
! 1054:
! 1055: * not work properly.
! 1056:
! 1057: */
! 1058:
! 1059: if (d > 2 && r == EUNDEV)
! 1060:
! 1061: r = 2; /* assume there may be a change */
! 1062:
! 1063: else
! 1064:
! 1065: return r;
! 1066:
! 1067: }
1.1 root 1068:
1069: if (r == 1) { /* drive _may_ have changed */
1070:
1071: r = rwabs(0, tmpbuf, 1, 0, d, 0L); /* check the BIOS */
1072:
1073: if (r != E_CHNG) { /* nope, no change */
1074:
1.1.1.4 root 1075: TRACE(("rwabs returned %d", r));
1076:
1077: return (r < 0) ? r : 0;
1.1 root 1078:
1079: }
1080:
1081: r = 2; /* drive was definitely changed */
1082:
1083: }
1084:
1085: if (r == 2) {
1086:
1.1.1.4 root 1087: TRACE(("definite media change"));
1088:
1.1 root 1089: fs = drives[d]; /* get filesystem associated with drive */
1090:
1091: if ((*fs->dskchng)(d)) { /* does the fs agree that it changed? */
1092:
1.1.1.2 root 1093: drives[d] = 0;
1094:
1.1 root 1095: changedrv(d); /* yes -- do the change */
1096:
1097: return 1;
1098:
1099: }
1100:
1101: }
1102:
1103: return 0;
1104:
1105: }
1106:
1107:
1108:
1109: /*
1110:
1111: * routines for parsing path names
1112:
1113: */
1114:
1115:
1116:
1117: #define DIRSEP(p) ((p) == '\\')
1118:
1119:
1120:
1121: /*
1122:
1123: * relpath2cookie converts a TOS file name into a file cookie representing
1124:
1125: * the directory the file resides in, and a character string representing
1126:
1127: * the name of the file in that directory. The character string is
1128:
1129: * copied into the "lastname" array. If lastname is NULL, then the cookie
1130:
1131: * returned actually represents the file, instead of just the directory
1132:
1133: * the file is in.
1134:
1135: *
1136:
1137: * note that lastname, if non-null, should be big enough to contain all the
1138:
1139: * characters in "path", since if the file system doesn't want the kernel
1140:
1141: * to do path name parsing we may end up just copying path to lastname
1142:
1143: * and returning the current or root directory, as appropriate
1144:
1145: *
1146:
1147: * "relto" is the directory relative to which the search should start.
1148:
1149: * if you just want the current directory, use path2cookie instead.
1150:
1151: *
1152:
1153: */
1154:
1155:
1156:
1157: #define MAX_LINKS 4
1158:
1159:
1160:
1161: long
1162:
1163: relpath2cookie(relto, path, lastname, res, depth)
1164:
1165: fcookie *relto;
1166:
1167: const char *path;
1168:
1169: char *lastname;
1170:
1171: fcookie *res;
1172:
1173: int depth;
1174:
1175: {
1176:
1.1.1.3 root 1177: fcookie dir;
1.1 root 1178:
1179: int drv;
1180:
1181: int len;
1182:
1183: char c, *s;
1184:
1185: XATTR xattr;
1186:
1187: static char newpath[16] = "U:\\DEV\\";
1188:
1189: char temp2[PATH_MAX];
1190:
1191: char linkstuff[PATH_MAX];
1192:
1.1.1.3 root 1193: long r;
1.1 root 1194:
1195:
1196:
1197: /* dolast: 0 == return a cookie for the directory the file is in
1198:
1199: * 1 == return a cookie for the file itself, don't follow links
1200:
1201: * 2 == return a cookie for whatever the file points at
1202:
1203: */
1204:
1205: int dolast = 0;
1206:
1207: int i = 0;
1208:
1209:
1210:
1211: if (!lastname) {
1212:
1213: dolast = 1;
1214:
1215: lastname = temp2;
1216:
1217: } else if (lastname == follow_links) {
1218:
1219: dolast = 2;
1220:
1221: lastname = temp2;
1222:
1223: }
1224:
1225:
1226:
1227: *lastname = 0;
1228:
1229:
1230:
1.1.1.3 root 1231: PATH2COOKIE_DB(("relpath2cookie(%s, dolast=%d, depth=%d)", path, dolast, depth));
1232:
1233:
1234:
1235: if (depth > MAX_LINKS) {
1236:
1237: DEBUG(("Too many symbolic links"));
1238:
1239: return ELOOP;
1240:
1241: }
1242:
1.1 root 1243: /* special cases: CON:, AUX:, etc. should be converted to U:\DEV\CON,
1244:
1245: * U:\DEV\AUX, etc.
1246:
1247: */
1248:
1249: if (strlen(path) == 4 && path[3] == ':') {
1250:
1251: strncpy(newpath+7, path, 3);
1252:
1253: path = newpath;
1254:
1255: }
1256:
1257:
1258:
1259: /* first, check for a drive letter */
1260:
1261: /* BUG: a '\' at the start of a symbolic link is relative to the current
1262:
1263: * drive of the process, not the drive the link is located on
1264:
1265: */
1266:
1.1.1.3 root 1267: if (path[1] == ':') {
1.1 root 1268:
1269: c = path[0];
1270:
1271: if (c >= 'a' && c <= 'z')
1272:
1273: drv = c - 'a';
1274:
1275: else if (c >= 'A' && c <= 'Z')
1276:
1277: drv = c - 'A';
1278:
1279: else
1280:
1281: goto nodrive;
1282:
1283: path += 2;
1284:
1285: i = 1; /* remember that we saw a drive letter */
1286:
1287: } else {
1288:
1289: nodrive:
1290:
1291: drv = curproc->curdrv;
1292:
1293: }
1294:
1295:
1296:
1297: /* see if the path is rooted from '\\' */
1298:
1299: if (DIRSEP(*path)) {
1300:
1301: while(DIRSEP(*path))path++;
1302:
1.1.1.3 root 1303: dup_cookie(&dir, &curproc->root[drv]);
1.1 root 1304:
1305: } else {
1306:
1307: if (i) { /* an explicit drive letter was given */
1308:
1.1.1.3 root 1309: dup_cookie(&dir, &curproc->curdir[drv]);
1.1 root 1310:
1311: }
1312:
1313: else
1314:
1.1.1.3 root 1315: dup_cookie(&dir, relto);
1.1 root 1316:
1317: }
1318:
1319:
1320:
1321: if (!dir.fs) {
1322:
1323: changedrv(dir.dev);
1324:
1.1.1.3 root 1325: dup_cookie(&dir, &curproc->root[drv]);
1.1 root 1326:
1327: }
1328:
1329:
1330:
1331: if (!dir.fs) {
1332:
1.1.1.3 root 1333: DEBUG(("path2cookie: no file system: returning EDRIVE"));
1.1 root 1334:
1335: return EDRIVE;
1336:
1337: }
1338:
1339:
1340:
1.1.1.3 root 1341: /* here's where we come when we've gone across a mount point */
1.1 root 1342:
1.1.1.3 root 1343:
1.1 root 1344:
1.1.1.3 root 1345: restart_mount:
1.1 root 1346:
1347:
1348:
1.1.1.3 root 1349: if (!*path) { /* nothing more to do */
1.1 root 1350:
1.1.1.3 root 1351: PATH2COOKIE_DB(("relpath2cookie: no more path, returning 0"));
1.1 root 1352:
1.1.1.3 root 1353: *res = dir;
1.1 root 1354:
1.1.1.3 root 1355: return 0;
1356:
1357: }
1.1 root 1358:
1359:
1360:
1361: /* see if there has been a disk change; if so, return E_CHNG.
1362:
1363: * path2cookie will restart the search automatically; other functions
1364:
1365: * that call relpath2cookie directly will have to fail gracefully
1366:
1367: */
1368:
1.1.1.4 root 1369: if ((r = disk_changed(dir.dev)) != 0) {
1.1 root 1370:
1.1.1.3 root 1371: release_cookie(&dir);
1372:
1.1.1.4 root 1373: if (r > 0) r = E_CHNG;
1374:
1375: PATH2COOKIE_DB(("relpath2cookie: returning %d", r));
1.1.1.3 root 1376:
1.1.1.4 root 1377: return r;
1.1 root 1378:
1379: }
1380:
1381:
1382:
1.1.1.3 root 1383:
1384:
1.1 root 1385: if (dir.fs->fsflags & FS_KNOPARSE) {
1386:
1387: if (!dolast) {
1388:
1.1.1.3 root 1389: PATH2COOKIE_DB(("fs is a KNOPARSE, nothing to do"));
1390:
1.1 root 1391: strncpy(lastname, path, PATH_MAX-1);
1392:
1393: lastname[PATH_MAX - 1] = 0;
1394:
1395: r = 0;
1396:
1.1.1.3 root 1397: *res = dir;
1398:
1.1 root 1399: } else {
1400:
1.1.1.3 root 1401: PATH2COOKIE_DB(("fs is a KNOPARSE, calling lookup"));
1402:
1.1 root 1403: r = (*dir.fs->lookup)(&dir, path, res);
1404:
1.1.1.3 root 1405: if (r == EMOUNT) { /* hmmm... a ".." at a mount point, maybe */
1.1 root 1406:
1.1.1.3 root 1407: fcookie mounteddir;
1.1 root 1408:
1.1.1.3 root 1409: r = (*dir.fs->root)(dir.dev, &mounteddir);
1.1 root 1410:
1.1.1.3 root 1411: if (r == 0 && drv == UNIDRV) {
1.1 root 1412:
1.1.1.3 root 1413: if (dir.fs == mounteddir.fs &&
1.1 root 1414:
1.1.1.3 root 1415: dir.index == mounteddir.index &&
1.1 root 1416:
1.1.1.3 root 1417: dir.dev == mounteddir.dev) {
1.1 root 1418:
1.1.1.3 root 1419: release_cookie(&dir);
1.1 root 1420:
1.1.1.3 root 1421: release_cookie(&mounteddir);
1.1 root 1422:
1.1.1.3 root 1423: dup_cookie(&dir, &curproc->root[UNIDRV]);
1.1 root 1424:
1.1.1.3 root 1425: TRACE(("path2cookie: restarting from mount point"));
1.1 root 1426:
1.1.1.3 root 1427: goto restart_mount;
1.1 root 1428:
1.1.1.3 root 1429: }
1.1 root 1430:
1.1.1.3 root 1431: } else {
1.1 root 1432:
1.1.1.3 root 1433: if (r == 0)
1.1 root 1434:
1.1.1.3 root 1435: release_cookie(&mounteddir);
1.1 root 1436:
1.1.1.3 root 1437: r = 0;
1.1 root 1438:
1.1.1.3 root 1439: }
1.1 root 1440:
1.1.1.3 root 1441: }
1.1 root 1442:
1.1.1.3 root 1443: release_cookie(&dir);
1.1 root 1444:
1.1.1.3 root 1445: }
1.1 root 1446:
1.1.1.3 root 1447: PATH2COOKIE_DB(("relpath2cookie: returning %ld", r));
1.1 root 1448:
1.1.1.3 root 1449: return r;
1.1 root 1450:
1.1.1.3 root 1451: }
1.1 root 1452:
1453:
1454:
1455:
1456:
1.1.1.3 root 1457: /* parse all but (possibly) the last component of the path name */
1.1 root 1458:
1.1.1.3 root 1459: /* rules here: at the top of the loop, &dir is the cookie of
1.1 root 1460:
1.1.1.3 root 1461: * the directory we're in now, xattr is its attributes, and res is unset
1.1 root 1462:
1.1.1.3 root 1463: * at the end of the loop, &dir is unset, and either r is nonzero
1.1 root 1464:
1.1.1.3 root 1465: * (to indicate an error) or res is set to the final result
1.1 root 1466:
1.1.1.3 root 1467: */
1.1 root 1468:
1.1.1.3 root 1469: r = (dir.fs->getxattr)(&dir, &xattr);
1.1 root 1470:
1.1.1.3 root 1471: if (r) {
1.1 root 1472:
1.1.1.3 root 1473: DEBUG(("couldn't get directory attributes"));
1.1 root 1474:
1.1.1.3 root 1475: release_cookie(&dir);
1.1 root 1476:
1.1.1.3 root 1477: return EINTRN;
1.1 root 1478:
1.1.1.3 root 1479: }
1.1 root 1480:
1481:
1482:
1.1.1.3 root 1483: while (*path) {
1.1 root 1484:
1485:
1486:
1.1.1.3 root 1487: /* now we must have a directory, since there are more things in the path */
1.1 root 1488:
1.1.1.3 root 1489: if ((xattr.mode & S_IFMT) != S_IFDIR) {
1.1 root 1490:
1.1.1.3 root 1491: PATH2COOKIE_DB(("relpath2cookie: not a directory, returning EPTHNF"));
1.1 root 1492:
1.1.1.3 root 1493: release_cookie(&dir);
1494:
1495: r = EPTHNF;
1.1 root 1496:
1497: break;
1498:
1499: }
1500:
1.1.1.3 root 1501: /* we must also have search permission for the directory */
1.1 root 1502:
1.1.1.3 root 1503: if (denyaccess(&xattr, S_IXOTH)) {
1.1 root 1504:
1.1.1.3 root 1505: DEBUG(("search permission in directory denied"));
1.1 root 1506:
1.1.1.3 root 1507: release_cookie(&dir);
1.1 root 1508:
1.1.1.3 root 1509: r = EPTHNF;
1.1 root 1510:
1.1.1.3 root 1511: break;
1.1 root 1512:
1.1.1.3 root 1513: }
1.1 root 1514:
1515:
1516:
1.1.1.3 root 1517: /* if there's nothing left in the path, we can break here */
1.1 root 1518:
1.1.1.3 root 1519: if (!*path) {
1.1 root 1520:
1.1.1.3 root 1521: PATH2COOKIE_DB(("relpath2cookie: no more path, breaking (1)"));
1.1 root 1522:
1.1.1.3 root 1523: *res = dir;
1.1 root 1524:
1.1.1.3 root 1525: break;
1.1 root 1526:
1.1.1.3 root 1527: }
1.1 root 1528:
1529: /* next, peel off the next name in the path */
1530:
1531: len = 0;
1532:
1533: s = lastname;
1534:
1535: c = *path;
1536:
1537: while (c && !DIRSEP(c)) {
1538:
1539: if (len++ < PATH_MAX)
1540:
1541: *s++ = c;
1542:
1543: c = *++path;
1544:
1545: }
1546:
1547: *s = 0;
1548:
1549:
1550:
1.1.1.3 root 1551: /* if there are no more names in the path, and we don't want
1552:
1553: * to actually look up the last name, then we're done
1554:
1555: */
1556:
1557: if (dolast == 0 && !*path) {
1.1 root 1558:
1.1.1.3 root 1559: *res = dir;
1.1 root 1560:
1.1.1.3 root 1561: PATH2COOKIE_DB(("relpath2cookie: no more path, breaking (2)"));
1.1 root 1562:
1563: break;
1564:
1.1.1.3 root 1565: }
1566:
1567:
1568:
1569:
1570:
1571: /*
1572:
1573: * skip trailing slashes
1574:
1575: */
1576:
1577: while (DIRSEP(*path)) path++;
1578:
1579:
1580:
1581: PATH2COOKIE_DB(("relpath2cookie: looking up [%s]", lastname));
1582:
1.1 root 1583:
1584:
1585: r = (*dir.fs->lookup)(&dir, lastname, res);
1586:
1.1.1.3 root 1587: if (r == EMOUNT) {
1.1 root 1588:
1.1.1.3 root 1589: fcookie mounteddir;
1.1 root 1590:
1.1.1.3 root 1591: r = (*dir.fs->root)(dir.dev, &mounteddir);
1592:
1593: if (r == 0 && drv == UNIDRV) {
1594:
1595: if (samefile(&dir, &mounteddir)) {
1596:
1597: release_cookie(&dir);
1598:
1599: release_cookie(&mounteddir);
1600:
1601: dup_cookie(&dir, &curproc->root[UNIDRV]);
1602:
1603: TRACE(("path2cookie: restarting from mount point"));
1604:
1605: goto restart_mount;
1606:
1607: } else if (r == 0) {
1608:
1609: r = EINTRN;
1610:
1611: release_cookie(&mounteddir);
1612:
1613: release_cookie(&dir);
1614:
1615: break;
1616:
1617: }
1618:
1619: } else if (r == 0) {
1620:
1621: release_cookie(&mounteddir);
1622:
1623: } else {
1624:
1625: release_cookie(&dir);
1626:
1627: break;
1628:
1629: }
1630:
1631: } else if (r) {
1632:
1.1.1.5 ! root 1633: if (r == EFILNF && *path) {
! 1634:
! 1635: /* the "file" we didn't find was treated as a directory */
! 1636:
! 1637: r = EPTHNF;
! 1638:
! 1639: }
! 1640:
1.1.1.3 root 1641: release_cookie(&dir);
1.1 root 1642:
1643: break;
1644:
1645: }
1646:
1647:
1648:
1.1.1.3 root 1649: /* check for a symbolic link */
1650:
1651: r = (res->fs->getxattr)(res, &xattr);
1652:
1653: if (r != 0) {
1654:
1655: DEBUG(("path2cookie: couldn't get file attributes"));
1656:
1657: release_cookie(&dir);
1658:
1659: release_cookie(res);
1660:
1661: break;
1662:
1663: }
1664:
1.1 root 1665:
1666:
1.1.1.3 root 1667: /* if the file is a link, and we're following links, follow it */
1.1 root 1668:
1.1.1.3 root 1669: if ( (xattr.mode & S_IFMT) == S_IFLNK && (*path || dolast > 1)) {
1.1 root 1670:
1.1.1.3 root 1671: r = (res->fs->readlink)(res, linkstuff, PATH_MAX);
1.1 root 1672:
1.1.1.3 root 1673: release_cookie(res);
1.1 root 1674:
1.1.1.3 root 1675: if (r) {
1.1 root 1676:
1.1.1.3 root 1677: DEBUG(("error reading symbolic link"));
1.1 root 1678:
1.1.1.3 root 1679: release_cookie(&dir);
1.1 root 1680:
1.1.1.3 root 1681: break;
1.1 root 1682:
1.1.1.3 root 1683: }
1.1 root 1684:
1.1.1.3 root 1685: r = relpath2cookie(&dir, linkstuff, follow_links, res,
1.1 root 1686:
1.1.1.3 root 1687: depth+1);
1.1 root 1688:
1.1.1.3 root 1689: release_cookie(&dir);
1690:
1691: if (r) {
1692:
1693: DEBUG(("error following symbolic link"));
1694:
1695: break;
1.1 root 1696:
1697: }
1698:
1.1.1.3 root 1699: dir = *res;
1.1 root 1700:
1.1.1.3 root 1701: (void)(res->fs->getxattr)(res, &xattr);
1702:
1703: } else {
1704:
1705: release_cookie(&dir);
1706:
1707: dir = *res;
1708:
1709: }
1.1 root 1710:
1711: }
1712:
1713:
1714:
1.1.1.3 root 1715: PATH2COOKIE_DB(("relpath2cookie: returning %ld", r));
1716:
1.1 root 1717: return r;
1718:
1719: }
1720:
1721:
1722:
1723: #define MAX_TRYS 8
1724:
1725:
1726:
1727: long
1728:
1729: path2cookie(path, lastname, res)
1730:
1731: const char *path;
1732:
1733: char *lastname;
1734:
1735: fcookie *res;
1736:
1737: {
1738:
1739: fcookie *dir;
1740:
1741: long r;
1742:
1743: /* AHDI sometimes will keep insisting that a media change occured;
1744:
1.1.1.3 root 1745: * we limit the number of retrys to avoid hanging the system
1.1 root 1746:
1747: */
1748:
1749: int trycnt = 0;
1750:
1751:
1752:
1753: dir = &curproc->curdir[curproc->curdrv];
1754:
1755:
1756:
1757: do {
1758:
1.1.1.3 root 1759: r = relpath2cookie(dir, path, lastname, res, 0);
1.1 root 1760:
1761: if (r == E_CHNG)
1762:
1.1.1.2 root 1763: DEBUG(("path2cookie: restarting due to media change"));
1.1 root 1764:
1765: } while (r == E_CHNG && trycnt++ < MAX_TRYS);
1766:
1767:
1768:
1769: return r;
1770:
1771: }
1772:
1773:
1774:
1775: /*
1776:
1.1.1.3 root 1777: * release_cookie: tell the file system owner that a cookie is no
1778:
1779: * longer in use by the kernel
1780:
1781: */
1782:
1783: void
1784:
1785: release_cookie(fc)
1786:
1787: fcookie *fc;
1788:
1789: {
1790:
1791: FILESYS *fs;
1792:
1793:
1794:
1795: if (fc) {
1796:
1797: fs = fc->fs;
1798:
1799: if (fs && fs->release) {
1800:
1801: (void)(*fs->release)(fc);
1802:
1803: }
1804:
1805: }
1806:
1807: }
1808:
1809:
1810:
1811: /*
1812:
1813: * Make a new cookie (newc) which is a duplicate of the old cookie
1814:
1815: * (oldc). This may be something the file system is interested in,
1816:
1817: * so we give it a chance to do the duplication; if it doesn't
1818:
1819: * want to, we just copy.
1820:
1821: */
1822:
1823:
1824:
1825: void
1826:
1827: dup_cookie(newc, oldc)
1828:
1829: fcookie *newc, *oldc;
1830:
1831: {
1832:
1833: FILESYS *fs = oldc->fs;
1834:
1835:
1836:
1837: if (fs && fs->release && fs->dupcookie) {
1838:
1839: (void)(*fs->dupcookie)(newc, oldc);
1840:
1841: } else {
1842:
1843: *newc = *oldc;
1844:
1845: }
1846:
1847: }
1848:
1849:
1850:
1851: /*
1852:
1.1 root 1853: * new_fileptr, dispose_fileptr: allocate (deallocate) a file pointer
1854:
1855: */
1856:
1857:
1858:
1859: FILEPTR *
1860:
1861: new_fileptr()
1862:
1863: {
1864:
1865: FILEPTR *f;
1866:
1867:
1868:
1.1.1.2 root 1869: if ((f = flist) != 0) {
1.1 root 1870:
1871: flist = f->next;
1872:
1873: f->next = 0;
1874:
1875: return f;
1876:
1877: }
1878:
1879: f = kmalloc(SIZEOF(FILEPTR));
1880:
1881: if (!f) {
1882:
1883: FATAL("new_fileptr: out of memory");
1884:
1885: }
1886:
1887: else {
1888:
1889: f->next = 0;
1890:
1891: }
1892:
1893: return f;
1894:
1895: }
1896:
1897:
1898:
1899: void
1900:
1901: dispose_fileptr(f)
1902:
1903: FILEPTR *f;
1904:
1905: {
1906:
1907: if (f->links != 0) {
1908:
1909: FATAL("dispose_fileptr: f->links == %d", f->links);
1910:
1911: }
1912:
1913: f->next = flist;
1914:
1915: flist = f;
1916:
1917: }
1918:
1919:
1920:
1921: /*
1922:
1923: * denyshare(list, f): "list" points at the first FILEPTR in a
1924:
1925: * chained list of open FILEPTRS referring to the same file;
1926:
1927: * f is a newly opened FILEPTR. Every FILEPTR in the given list is
1928:
1929: * checked to see if its "open" mode (in list->flags) is compatible with
1930:
1931: * the open mode in f->flags. If not (for example, if f was opened with
1932:
1933: * a "read" mode and some other file has the O_DENYREAD share mode),
1934:
1935: * then 1 is returned. If all the open FILEPTRs in the list are
1936:
1937: * compatible with f, then 0 is returned.
1938:
1939: * This is not as complicated as it sounds. In practice, just keep a
1940:
1941: * list of open FILEPTRs attached to each file, and put something like
1942:
1943: * if (denyshare(thisfile->openfileptrlist, newfileptr))
1944:
1945: * return EACCDN;
1946:
1947: * in the device open routine.
1948:
1949: */
1950:
1951:
1952:
1.1.1.2 root 1953: int ARGS_ON_STACK
1.1 root 1954:
1955: denyshare(list, f)
1956:
1957: FILEPTR *list, *f;
1958:
1959: {
1960:
1.1.1.3 root 1961: int newrm, newsm; /* new read and sharing mode */
1.1 root 1962:
1.1.1.3 root 1963: int oldrm, oldsm; /* read and sharing mode of already opened file */
1.1 root 1964:
1965: int i;
1966:
1967:
1968:
1969: newrm = f->flags & O_RWMODE;
1970:
1971: newsm = f->flags & O_SHMODE;
1972:
1973:
1974:
1.1.1.3 root 1975: /*
1976:
1977: * O_EXEC gets treated the same as O_RDONLY for our purposes
1978:
1979: */
1980:
1981: if (newrm == O_EXEC) newrm = O_RDONLY;
1982:
1983:
1984:
1985: /* New meaning for O_COMPAT: deny write access to all _other_
1986:
1987: * processes.
1988:
1989: */
1990:
1991:
1992:
1.1 root 1993: for ( ; list; list = list->next) {
1994:
1995: oldrm = list->flags & O_RWMODE;
1996:
1.1.1.3 root 1997: if (oldrm == O_EXEC) oldrm = O_RDONLY;
1998:
1.1 root 1999: oldsm = list->flags & O_SHMODE;
2000:
2001: if (oldsm == O_DENYW || oldsm == O_DENYRW) {
2002:
1.1.1.3 root 2003: if (newrm != O_RDONLY) {
1.1 root 2004:
1.1.1.2 root 2005: DEBUG(("write access denied"));
1.1 root 2006:
2007: return 1;
2008:
2009: }
2010:
2011: }
2012:
2013: if (oldsm == O_DENYR || oldsm == O_DENYRW) {
2014:
2015: if (newrm != O_WRONLY) {
2016:
1.1.1.2 root 2017: DEBUG(("read access denied"));
1.1 root 2018:
2019: return 1;
2020:
2021: }
2022:
2023: }
2024:
2025: if (newsm == O_DENYW || newsm == O_DENYRW) {
2026:
1.1.1.3 root 2027: if (oldrm != O_RDONLY) {
1.1 root 2028:
1.1.1.2 root 2029: DEBUG(("couldn't deny writes"));
1.1 root 2030:
2031: return 1;
2032:
2033: }
2034:
2035: }
2036:
2037: if (newsm == O_DENYR || newsm == O_DENYRW) {
2038:
2039: if (oldrm != O_WRONLY) {
2040:
1.1.1.2 root 2041: DEBUG(("couldn't deny reads"));
1.1 root 2042:
2043: return 1;
2044:
2045: }
2046:
2047: }
2048:
2049: /* If either sm == O_COMPAT, then we check to make sure
2050:
2051: that the file pointers are owned by the same process (O_COMPAT means
2052:
1.1.1.3 root 2053: "deny writes to any other processes"). This isn't quite the same
1.1 root 2054:
1.1.1.3 root 2055: as the Atari spec, which says O_COMPAT means "deny access to other
1.1 root 2056:
1.1.1.3 root 2057: processes." We should fix the spec.
1.1 root 2058:
1.1.1.3 root 2059: */
1.1 root 2060:
1.1.1.3 root 2061: if ((newsm == O_COMPAT && newrm != O_RDONLY && oldrm != O_RDONLY) ||
1.1 root 2062:
1.1.1.3 root 2063: (oldsm == O_COMPAT && newrm != O_RDONLY)) {
1.1 root 2064:
2065: for (i = MIN_HANDLE; i < MAX_OPEN; i++) {
2066:
2067: if (curproc->handle[i] == list)
2068:
2069: goto found;
2070:
2071: }
2072:
2073: /* old file pointer is not open by this process */
2074:
1.1.1.3 root 2075: DEBUG(("O_COMPAT file was opened for writing by another process"));
1.1 root 2076:
2077: return 1;
2078:
2079: found:
2080:
2081: ; /* everything is OK */
2082:
2083: }
2084:
2085: }
2086:
2087: return 0;
2088:
2089: }
2090:
2091:
2092:
2093: /*
2094:
2095: * denyaccess(XATTR *xattr, unsigned perm): checks to see if the access
2096:
2097: * specified by perm (which must be some combination of S_IROTH, S_IWOTH,
2098:
2099: * and S_IXOTH) should be granted to the current process
2100:
2101: * on a file with the given extended attributes. Returns 0 if access
2102:
2103: * by the current process is OK, 1 if not.
2104:
2105: */
2106:
2107:
2108:
2109: int
2110:
2111: denyaccess(xattr, perm)
2112:
2113: XATTR *xattr;
2114:
2115: unsigned perm;
2116:
2117: {
2118:
2119: unsigned mode;
2120:
2121:
2122:
2123: /* the super-user can do anything! */
2124:
2125: if (curproc->euid == 0)
2126:
2127: return 0;
2128:
2129:
2130:
2131: mode = xattr->mode;
2132:
2133: if (curproc->euid == xattr->uid)
2134:
2135: perm = perm << 6;
2136:
2137: else if (curproc->egid == xattr->gid)
2138:
2139: perm = perm << 3;
2140:
2141: if ((mode & perm) != perm) return 1; /* access denied */
2142:
2143: return 0;
2144:
2145: }
2146:
2147:
2148:
2149: /*
2150:
2151: * Checks a lock against a list of locks to see if there is a conflict.
2152:
2153: * This is a utility to be used by file systems, somewhat like denyshare
2154:
2155: * above. Returns 0 if there is no conflict, or a pointer to the
2156:
2157: * conflicting LOCK structure if there is.
2158:
2159: *
2160:
2161: * Conflicts occur for overlapping locks if the process id's are
2162:
2163: * different and if at least one of the locks is a write lock.
2164:
2165: *
2166:
2167: * NOTE: we assume before being called that the locks have been converted
2168:
2169: * so that l_start is absolute. not relative to the current position or
2170:
2171: * end of file.
2172:
2173: */
2174:
2175:
2176:
1.1.1.2 root 2177: LOCK * ARGS_ON_STACK
1.1 root 2178:
2179: denylock(list, lck)
2180:
2181: LOCK *list, *lck;
2182:
2183: {
2184:
2185: LOCK *t;
2186:
2187: unsigned long tstart, tend;
2188:
2189: unsigned long lstart, lend;
2190:
2191: int pid = curproc->pid;
2192:
2193: int ltype;
2194:
2195:
2196:
2197: ltype = lck->l.l_type;
2198:
2199: lstart = lck->l.l_start;
2200:
2201:
2202:
2203: if (lck->l.l_len == 0)
2204:
1.1.1.2 root 2205: lend = 0xffffffffL;
1.1 root 2206:
2207: else
2208:
1.1.1.3 root 2209: lend = lstart + lck->l.l_len - 1;
1.1 root 2210:
2211:
2212:
2213: for (t = list; t; t = t->next) {
2214:
2215: tstart = t->l.l_start;
2216:
2217: if (t->l.l_len == 0)
2218:
1.1.1.2 root 2219: tend = 0xffffffffL;
1.1 root 2220:
2221: else
2222:
1.1.1.3 root 2223: tend = tstart + t->l.l_len - 1;
1.1 root 2224:
2225:
2226:
2227: /* look for overlapping locks */
2228:
2229: if (tstart <= lstart && tend >= lstart && t->l.l_pid != pid &&
2230:
2231: (ltype == F_WRLCK || t->l.l_type == F_WRLCK))
2232:
2233: break;
2234:
2235: if (lstart <= tstart && lend >= tstart && t->l.l_pid != pid &&
2236:
2237: (ltype == F_WRLCK || t->l.l_type == F_WRLCK))
2238:
2239: break;
2240:
2241: }
2242:
2243: return t;
2244:
2245: }
2246:
2247:
2248:
2249: /*
2250:
2251: * check to see that a file is a directory, and that write permission
2252:
2253: * is granted; return an error code, or 0 if everything is ok.
2254:
2255: */
2256:
2257: long
2258:
2259: dir_access(dir, perm)
2260:
2261: fcookie *dir;
2262:
2263: unsigned perm;
2264:
2265: {
2266:
2267: XATTR xattr;
2268:
2269: long r;
2270:
2271:
2272:
2273: r = (*dir->fs->getxattr)(dir, &xattr);
2274:
1.1.1.3 root 2275: if (r) {
2276:
2277: DEBUG(("dir_access: file system returned %ld", r));
2278:
2279: return r;
2280:
2281: }
1.1 root 2282:
2283: if ( (xattr.mode & S_IFMT) != S_IFDIR ) {
2284:
1.1.1.2 root 2285: DEBUG(("file is not a directory"));
1.1 root 2286:
2287: return EPTHNF;
2288:
2289: }
2290:
2291: if (denyaccess(&xattr, perm)) {
2292:
1.1.1.2 root 2293: DEBUG(("no permission for directory"));
1.1 root 2294:
2295: return EACCDN;
2296:
2297: }
2298:
2299: return 0;
2300:
2301: }
2302:
2303:
2304:
2305: /*
2306:
2307: * returns 1 if the given name contains a wildcard character
2308:
2309: */
2310:
2311:
2312:
2313: int
2314:
2315: has_wild(name)
2316:
2317: const char *name;
2318:
2319: {
2320:
2321: char c;
2322:
2323:
2324:
1.1.1.2 root 2325: while ((c = *name++) != 0) {
1.1 root 2326:
2327: if (c == '*' || c == '?') return 1;
2328:
2329: }
2330:
2331: return 0;
2332:
2333: }
2334:
2335:
2336:
2337: /*
2338:
2339: * void copy8_3(dest, src): convert a file name (src) into DOS 8.3 format
2340:
2341: * (in dest). Note the following things:
2342:
2343: * if a field has less than the required number of characters, it is
2344:
2345: * padded with blanks
2346:
2347: * a '*' means to pad the rest of the field with '?' characters
2348:
2349: * special things to watch for:
2350:
2351: * "." and ".." are more or less left alone
2352:
2353: * "*.*" is recognized as a special pattern, for which dest is set
2354:
2355: * to just "*"
2356:
2357: * Long names are truncated. Any extensions after the first one are
2358:
2359: * ignored, i.e. foo.bar.c -> foo.bar, foo.c.bar->foo.c.
2360:
2361: */
2362:
2363:
2364:
2365: void
2366:
2367: copy8_3(dest, src)
2368:
2369: char *dest;
2370:
2371: const char *src;
2372:
2373: {
2374:
2375: char fill = ' ', c;
2376:
2377: int i;
2378:
2379:
2380:
2381: if (src[0] == '.') {
2382:
2383: if (src[1] == 0) {
2384:
2385: strcpy(dest, ". . ");
2386:
2387: return;
2388:
2389: }
2390:
2391: if (src[1] == '.' && src[2] == 0) {
2392:
2393: strcpy(dest, ".. . ");
2394:
2395: return;
2396:
2397: }
2398:
2399: }
2400:
2401: if (src[0] == '*' && src[1] == '.' && src[2] == '*' && src[3] == 0) {
2402:
2403: dest[0] = '*';
2404:
2405: dest[1] = 0;
2406:
2407: return;
2408:
2409: }
2410:
2411:
2412:
2413: for (i = 0; i < 8; i++) {
2414:
2415: c = *src++;
2416:
2417: if (!c || c == '.') break;
2418:
2419: if (c == '*') {
2420:
2421: fill = c = '?';
2422:
2423: }
2424:
2425: *dest++ = toupper(c);
2426:
2427: }
2428:
2429: while (i++ < 8) {
2430:
2431: *dest++ = fill;
2432:
2433: }
2434:
2435: *dest++ = '.';
2436:
2437: i = 0;
2438:
2439: fill = ' ';
2440:
2441: while (c && c != '.')
2442:
2443: c = *src++;
2444:
2445:
2446:
2447: if (c) {
2448:
2449: for( ;i < 3; i++) {
2450:
2451: c = *src++;
2452:
2453: if (!c || c == '.') break;
2454:
2455: if (c == '*')
2456:
2457: c = fill = '?';
2458:
2459: *dest++ = toupper(c);
2460:
2461: }
2462:
2463: }
2464:
2465: while (i++ < 3)
2466:
2467: *dest++ = fill;
2468:
1.1.1.2 root 2469: *dest = 0;
1.1 root 2470:
2471: }
2472:
2473:
2474:
2475: /*
2476:
2477: * int pat_match(name, patrn): returns 1 if "name" matches the template in
2478:
2479: * "patrn", 0 if not. "patrn" is assumed to have been expanded in 8.3
2480:
2481: * format by copy8_3; "name" need not be. Any '?' characters in patrn
2482:
2483: * will match any character in name. Note that if "patrn" has a '*' as
2484:
2485: * the first character, it will always match; this will happen only if
2486:
2487: * the original pattern (before copy8_3 was applied) was "*.*".
2488:
2489: *
2490:
2491: * BUGS: acts a lot like the silly TOS pattern matcher.
2492:
2493: */
2494:
2495:
2496:
2497: int
2498:
2499: pat_match(name, template)
2500:
2501: const char *name, *template;
2502:
2503: {
2504:
2505: register char *s, c;
2506:
2507: char expname[TOS_NAMELEN+1];
2508:
2509:
2510:
2511: if (*template == '*') return 1;
2512:
2513: copy8_3(expname, name);
2514:
2515:
2516:
2517: s = expname;
2518:
1.1.1.2 root 2519: while ((c = *template++) != 0) {
1.1 root 2520:
2521: if (c != *s && c != '?')
2522:
2523: return 0;
2524:
2525: s++;
2526:
2527: }
2528:
2529: return 1;
2530:
2531: }
2532:
2533:
2534:
2535: /*
2536:
2537: * int samefile(fcookie *a, fcookie *b): returns 1 if the two cookies
2538:
2539: * refer to the same file or directory, 0 otherwise
2540:
2541: */
2542:
2543:
2544:
2545: int
2546:
2547: samefile(a, b)
2548:
2549: fcookie *a, *b;
2550:
2551: {
2552:
2553: if (a->fs == b->fs && a->dev == b->dev && a->index == b->index)
2554:
2555: return 1;
2556:
2557: return 0;
2558:
2559: }
2560:
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