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0e8cc8bd WJ |
1 | /* |
2 | * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. | |
3 | * | |
4 | * Copyright (C) 2002-2007 Aleph One Ltd. | |
5 | * for Toby Churchill Ltd and Brightstar Engineering | |
6 | * | |
7 | * Created by Charles Manning <charles@aleph1.co.uk> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
90ef117b WJ |
14 | /* XXX U-BOOT XXX */ |
15 | #include <common.h> | |
16 | #include <malloc.h> | |
17 | ||
0e8cc8bd WJ |
18 | #include "yaffsfs.h" |
19 | #include "yaffs_guts.h" | |
20 | #include "yaffscfg.h" | |
0e8cc8bd WJ |
21 | #include "yportenv.h" |
22 | ||
90ef117b WJ |
23 | /* XXX U-BOOT XXX */ |
24 | #if 0 | |
25 | #include <string.h> // for memset | |
26 | #endif | |
27 | ||
0e8cc8bd WJ |
28 | #define YAFFSFS_MAX_SYMLINK_DEREFERENCES 5 |
29 | ||
30 | #ifndef NULL | |
31 | #define NULL ((void *)0) | |
32 | #endif | |
33 | ||
34 | ||
35 | const char *yaffsfs_c_version="$Id: yaffsfs.c,v 1.18 2007/07/18 19:40:38 charles Exp $"; | |
36 | ||
37 | // configurationList is the list of devices that are supported | |
38 | static yaffsfs_DeviceConfiguration *yaffsfs_configurationList; | |
39 | ||
40 | ||
41 | /* Some forward references */ | |
42 | static yaffs_Object *yaffsfs_FindObject(yaffs_Object *relativeDirectory, const char *path, int symDepth); | |
43 | static void yaffsfs_RemoveObjectCallback(yaffs_Object *obj); | |
44 | ||
45 | ||
46 | // Handle management. | |
47 | // | |
48 | ||
49 | ||
50 | unsigned int yaffs_wr_attempts; | |
51 | ||
52 | typedef struct | |
53 | { | |
54 | __u8 inUse:1; // this handle is in use | |
55 | __u8 readOnly:1; // this handle is read only | |
56 | __u8 append:1; // append only | |
57 | __u8 exclusive:1; // exclusive | |
58 | __u32 position; // current position in file | |
59 | yaffs_Object *obj; // the object | |
60 | }yaffsfs_Handle; | |
61 | ||
62 | ||
63 | static yaffsfs_Handle yaffsfs_handle[YAFFSFS_N_HANDLES]; | |
64 | ||
65 | // yaffsfs_InitHandle | |
66 | /// Inilitalise handles on start-up. | |
67 | // | |
68 | static int yaffsfs_InitHandles(void) | |
69 | { | |
70 | int i; | |
71 | for(i = 0; i < YAFFSFS_N_HANDLES; i++) | |
72 | { | |
73 | yaffsfs_handle[i].inUse = 0; | |
74 | yaffsfs_handle[i].obj = NULL; | |
75 | } | |
76 | return 0; | |
77 | } | |
78 | ||
79 | yaffsfs_Handle *yaffsfs_GetHandlePointer(int h) | |
80 | { | |
81 | if(h < 0 || h >= YAFFSFS_N_HANDLES) | |
82 | { | |
83 | return NULL; | |
84 | } | |
85 | ||
86 | return &yaffsfs_handle[h]; | |
87 | } | |
88 | ||
89 | yaffs_Object *yaffsfs_GetHandleObject(int handle) | |
90 | { | |
91 | yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle); | |
92 | ||
93 | if(h && h->inUse) | |
94 | { | |
95 | return h->obj; | |
96 | } | |
97 | ||
98 | return NULL; | |
99 | } | |
100 | ||
101 | ||
102 | //yaffsfs_GetHandle | |
103 | // Grab a handle (when opening a file) | |
104 | // | |
105 | ||
106 | static int yaffsfs_GetHandle(void) | |
107 | { | |
108 | int i; | |
109 | yaffsfs_Handle *h; | |
110 | ||
111 | for(i = 0; i < YAFFSFS_N_HANDLES; i++) | |
112 | { | |
113 | h = yaffsfs_GetHandlePointer(i); | |
114 | if(!h) | |
115 | { | |
116 | // todo bug: should never happen | |
117 | } | |
118 | if(!h->inUse) | |
119 | { | |
120 | memset(h,0,sizeof(yaffsfs_Handle)); | |
121 | h->inUse=1; | |
122 | return i; | |
123 | } | |
124 | } | |
125 | return -1; | |
126 | } | |
127 | ||
128 | // yaffs_PutHandle | |
129 | // Let go of a handle (when closing a file) | |
130 | // | |
131 | static int yaffsfs_PutHandle(int handle) | |
132 | { | |
133 | yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle); | |
134 | ||
135 | if(h) | |
136 | { | |
137 | h->inUse = 0; | |
138 | h->obj = NULL; | |
139 | } | |
140 | return 0; | |
141 | } | |
142 | ||
143 | ||
144 | ||
145 | // Stuff to search for a directory from a path | |
146 | ||
147 | ||
148 | int yaffsfs_Match(char a, char b) | |
149 | { | |
150 | // case sensitive | |
151 | return (a == b); | |
152 | } | |
153 | ||
154 | // yaffsfs_FindDevice | |
155 | // yaffsfs_FindRoot | |
156 | // Scan the configuration list to find the root. | |
157 | // Curveballs: Should match paths that end in '/' too | |
158 | // Curveball2 Might have "/x/ and "/x/y". Need to return the longest match | |
159 | static yaffs_Device *yaffsfs_FindDevice(const char *path, char **restOfPath) | |
160 | { | |
161 | yaffsfs_DeviceConfiguration *cfg = yaffsfs_configurationList; | |
162 | const char *leftOver; | |
163 | const char *p; | |
164 | yaffs_Device *retval = NULL; | |
165 | int thisMatchLength; | |
166 | int longestMatch = -1; | |
167 | ||
168 | // Check all configs, choose the one that: | |
169 | // 1) Actually matches a prefix (ie /a amd /abc will not match | |
170 | // 2) Matches the longest. | |
171 | while(cfg && cfg->prefix && cfg->dev) | |
172 | { | |
173 | leftOver = path; | |
174 | p = cfg->prefix; | |
175 | thisMatchLength = 0; | |
176 | ||
177 | while(*p && //unmatched part of prefix | |
178 | strcmp(p,"/") && // the rest of the prefix is not / (to catch / at end) | |
179 | *leftOver && | |
180 | yaffsfs_Match(*p,*leftOver)) | |
181 | { | |
182 | p++; | |
183 | leftOver++; | |
184 | thisMatchLength++; | |
185 | } | |
186 | if((!*p || strcmp(p,"/") == 0) && // end of prefix | |
187 | (!*leftOver || *leftOver == '/') && // no more in this path name part | |
188 | (thisMatchLength > longestMatch)) | |
189 | { | |
190 | // Matched prefix | |
191 | *restOfPath = (char *)leftOver; | |
192 | retval = cfg->dev; | |
193 | longestMatch = thisMatchLength; | |
194 | } | |
195 | cfg++; | |
196 | } | |
197 | return retval; | |
198 | } | |
199 | ||
200 | static yaffs_Object *yaffsfs_FindRoot(const char *path, char **restOfPath) | |
201 | { | |
202 | ||
203 | yaffs_Device *dev; | |
204 | ||
205 | dev= yaffsfs_FindDevice(path,restOfPath); | |
206 | if(dev && dev->isMounted) | |
207 | { | |
208 | return dev->rootDir; | |
209 | } | |
210 | return NULL; | |
211 | } | |
212 | ||
213 | static yaffs_Object *yaffsfs_FollowLink(yaffs_Object *obj,int symDepth) | |
214 | { | |
215 | ||
216 | while(obj && obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) | |
217 | { | |
218 | char *alias = obj->variant.symLinkVariant.alias; | |
219 | ||
220 | if(*alias == '/') | |
221 | { | |
222 | // Starts with a /, need to scan from root up | |
223 | obj = yaffsfs_FindObject(NULL,alias,symDepth++); | |
224 | } | |
225 | else | |
226 | { | |
227 | // Relative to here, so use the parent of the symlink as a start | |
228 | obj = yaffsfs_FindObject(obj->parent,alias,symDepth++); | |
229 | } | |
230 | } | |
231 | return obj; | |
232 | } | |
233 | ||
234 | ||
235 | // yaffsfs_FindDirectory | |
236 | // Parse a path to determine the directory and the name within the directory. | |
237 | // | |
238 | // eg. "/data/xx/ff" --> puts name="ff" and returns the directory "/data/xx" | |
239 | static yaffs_Object *yaffsfs_DoFindDirectory(yaffs_Object *startDir,const char *path,char **name,int symDepth) | |
240 | { | |
241 | yaffs_Object *dir; | |
242 | char *restOfPath; | |
243 | char str[YAFFS_MAX_NAME_LENGTH+1]; | |
244 | int i; | |
245 | ||
246 | if(symDepth > YAFFSFS_MAX_SYMLINK_DEREFERENCES) | |
247 | { | |
248 | return NULL; | |
249 | } | |
250 | ||
251 | if(startDir) | |
252 | { | |
253 | dir = startDir; | |
254 | restOfPath = (char *)path; | |
255 | } | |
256 | else | |
257 | { | |
258 | dir = yaffsfs_FindRoot(path,&restOfPath); | |
259 | } | |
260 | ||
261 | while(dir) | |
262 | { | |
263 | // parse off /. | |
264 | // curve ball: also throw away surplus '/' | |
265 | // eg. "/ram/x////ff" gets treated the same as "/ram/x/ff" | |
266 | while(*restOfPath == '/') | |
267 | { | |
268 | restOfPath++; // get rid of '/' | |
269 | } | |
270 | ||
271 | *name = restOfPath; | |
272 | i = 0; | |
273 | ||
274 | while(*restOfPath && *restOfPath != '/') | |
275 | { | |
276 | if (i < YAFFS_MAX_NAME_LENGTH) | |
277 | { | |
278 | str[i] = *restOfPath; | |
279 | str[i+1] = '\0'; | |
280 | i++; | |
281 | } | |
282 | restOfPath++; | |
283 | } | |
284 | ||
285 | if(!*restOfPath) | |
286 | { | |
287 | // got to the end of the string | |
288 | return dir; | |
289 | } | |
290 | else | |
291 | { | |
292 | if(strcmp(str,".") == 0) | |
293 | { | |
294 | // Do nothing | |
295 | } | |
296 | else if(strcmp(str,"..") == 0) | |
297 | { | |
298 | dir = dir->parent; | |
299 | } | |
300 | else | |
301 | { | |
302 | dir = yaffs_FindObjectByName(dir,str); | |
303 | ||
304 | while(dir && dir->variantType == YAFFS_OBJECT_TYPE_SYMLINK) | |
305 | { | |
306 | ||
307 | dir = yaffsfs_FollowLink(dir,symDepth); | |
308 | ||
309 | } | |
310 | ||
311 | if(dir && dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) | |
312 | { | |
313 | dir = NULL; | |
314 | } | |
315 | } | |
316 | } | |
317 | } | |
318 | // directory did not exist. | |
319 | return NULL; | |
320 | } | |
321 | ||
322 | static yaffs_Object *yaffsfs_FindDirectory(yaffs_Object *relativeDirectory,const char *path,char **name,int symDepth) | |
323 | { | |
324 | return yaffsfs_DoFindDirectory(relativeDirectory,path,name,symDepth); | |
325 | } | |
326 | ||
327 | // yaffsfs_FindObject turns a path for an existing object into the object | |
328 | // | |
329 | static yaffs_Object *yaffsfs_FindObject(yaffs_Object *relativeDirectory, const char *path,int symDepth) | |
330 | { | |
331 | yaffs_Object *dir; | |
332 | char *name; | |
333 | ||
334 | dir = yaffsfs_FindDirectory(relativeDirectory,path,&name,symDepth); | |
335 | ||
336 | if(dir && *name) | |
337 | { | |
338 | return yaffs_FindObjectByName(dir,name); | |
339 | } | |
340 | ||
341 | return dir; | |
342 | } | |
343 | ||
344 | ||
345 | ||
346 | int yaffs_open(const char *path, int oflag, int mode) | |
347 | { | |
348 | yaffs_Object *obj = NULL; | |
349 | yaffs_Object *dir = NULL; | |
350 | char *name; | |
351 | int handle = -1; | |
352 | yaffsfs_Handle *h = NULL; | |
353 | int alreadyOpen = 0; | |
354 | int alreadyExclusive = 0; | |
355 | int openDenied = 0; | |
356 | int symDepth = 0; | |
357 | int errorReported = 0; | |
358 | ||
359 | int i; | |
360 | ||
361 | ||
362 | // todo sanity check oflag (eg. can't have O_TRUNC without WRONLY or RDWR | |
363 | ||
364 | ||
365 | yaffsfs_Lock(); | |
366 | ||
367 | handle = yaffsfs_GetHandle(); | |
368 | ||
369 | if(handle >= 0) | |
370 | { | |
371 | ||
372 | h = yaffsfs_GetHandlePointer(handle); | |
373 | ||
374 | ||
375 | // try to find the exisiting object | |
376 | obj = yaffsfs_FindObject(NULL,path,0); | |
377 | ||
378 | if(obj && obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) | |
379 | { | |
380 | ||
381 | obj = yaffsfs_FollowLink(obj,symDepth++); | |
382 | } | |
383 | ||
384 | if(obj) | |
385 | { | |
386 | // Check if the object is already in use | |
387 | alreadyOpen = alreadyExclusive = 0; | |
388 | ||
389 | for(i = 0; i <= YAFFSFS_N_HANDLES; i++) | |
390 | { | |
391 | ||
392 | if(i != handle && | |
393 | yaffsfs_handle[i].inUse && | |
394 | obj == yaffsfs_handle[i].obj) | |
395 | { | |
396 | alreadyOpen = 1; | |
397 | if(yaffsfs_handle[i].exclusive) | |
398 | { | |
399 | alreadyExclusive = 1; | |
400 | } | |
401 | } | |
402 | } | |
403 | ||
404 | if(((oflag & O_EXCL) && alreadyOpen) || alreadyExclusive) | |
405 | { | |
406 | openDenied = 1; | |
407 | } | |
408 | ||
409 | // Open should fail if O_CREAT and O_EXCL are specified | |
410 | if((oflag & O_EXCL) && (oflag & O_CREAT)) | |
411 | { | |
412 | openDenied = 1; | |
413 | yaffsfs_SetError(-EEXIST); | |
414 | errorReported = 1; | |
415 | } | |
416 | ||
417 | // Check file permissions | |
418 | if( (oflag & (O_RDWR | O_WRONLY)) == 0 && // ie O_RDONLY | |
419 | !(obj->yst_mode & S_IREAD)) | |
420 | { | |
421 | openDenied = 1; | |
422 | } | |
423 | ||
424 | if( (oflag & O_RDWR) && | |
425 | !(obj->yst_mode & S_IREAD)) | |
426 | { | |
427 | openDenied = 1; | |
428 | } | |
429 | ||
430 | if( (oflag & (O_RDWR | O_WRONLY)) && | |
431 | !(obj->yst_mode & S_IWRITE)) | |
432 | { | |
433 | openDenied = 1; | |
434 | } | |
435 | ||
436 | } | |
437 | ||
438 | else if((oflag & O_CREAT)) | |
439 | { | |
440 | // Let's see if we can create this file | |
441 | dir = yaffsfs_FindDirectory(NULL,path,&name,0); | |
442 | if(dir) | |
443 | { | |
444 | obj = yaffs_MknodFile(dir,name,mode,0,0); | |
445 | } | |
446 | else | |
447 | { | |
448 | yaffsfs_SetError(-ENOTDIR); | |
449 | } | |
450 | } | |
451 | ||
452 | if(obj && !openDenied) | |
453 | { | |
454 | h->obj = obj; | |
455 | h->inUse = 1; | |
456 | h->readOnly = (oflag & (O_WRONLY | O_RDWR)) ? 0 : 1; | |
457 | h->append = (oflag & O_APPEND) ? 1 : 0; | |
458 | h->exclusive = (oflag & O_EXCL) ? 1 : 0; | |
459 | h->position = 0; | |
460 | ||
461 | obj->inUse++; | |
462 | if((oflag & O_TRUNC) && !h->readOnly) | |
463 | { | |
464 | //todo truncate | |
465 | yaffs_ResizeFile(obj,0); | |
466 | } | |
467 | ||
468 | } | |
469 | else | |
470 | { | |
471 | yaffsfs_PutHandle(handle); | |
472 | if(!errorReported) | |
473 | { | |
474 | yaffsfs_SetError(-EACCESS); | |
475 | errorReported = 1; | |
476 | } | |
477 | handle = -1; | |
478 | } | |
479 | ||
480 | } | |
481 | ||
482 | yaffsfs_Unlock(); | |
483 | ||
484 | return handle; | |
485 | } | |
486 | ||
487 | int yaffs_close(int fd) | |
488 | { | |
489 | yaffsfs_Handle *h = NULL; | |
490 | int retVal = 0; | |
491 | ||
492 | yaffsfs_Lock(); | |
493 | ||
494 | h = yaffsfs_GetHandlePointer(fd); | |
495 | ||
496 | if(h && h->inUse) | |
497 | { | |
498 | // clean up | |
499 | yaffs_FlushFile(h->obj,1); | |
500 | h->obj->inUse--; | |
501 | if(h->obj->inUse <= 0 && h->obj->unlinked) | |
502 | { | |
503 | yaffs_DeleteFile(h->obj); | |
504 | } | |
505 | yaffsfs_PutHandle(fd); | |
506 | retVal = 0; | |
507 | } | |
508 | else | |
509 | { | |
510 | // bad handle | |
511 | yaffsfs_SetError(-EBADF); | |
512 | retVal = -1; | |
513 | } | |
514 | ||
515 | yaffsfs_Unlock(); | |
516 | ||
517 | return retVal; | |
518 | } | |
519 | ||
520 | int yaffs_read(int fd, void *buf, unsigned int nbyte) | |
521 | { | |
522 | yaffsfs_Handle *h = NULL; | |
523 | yaffs_Object *obj = NULL; | |
524 | int pos = 0; | |
525 | int nRead = -1; | |
526 | int maxRead; | |
527 | ||
528 | yaffsfs_Lock(); | |
529 | h = yaffsfs_GetHandlePointer(fd); | |
530 | obj = yaffsfs_GetHandleObject(fd); | |
531 | ||
532 | if(!h || !obj) | |
533 | { | |
534 | // bad handle | |
535 | yaffsfs_SetError(-EBADF); | |
536 | } | |
537 | else if( h && obj) | |
538 | { | |
539 | pos= h->position; | |
540 | if(yaffs_GetObjectFileLength(obj) > pos) | |
541 | { | |
542 | maxRead = yaffs_GetObjectFileLength(obj) - pos; | |
543 | } | |
544 | else | |
545 | { | |
546 | maxRead = 0; | |
547 | } | |
548 | ||
549 | if(nbyte > maxRead) | |
550 | { | |
551 | nbyte = maxRead; | |
552 | } | |
553 | ||
554 | ||
555 | if(nbyte > 0) | |
556 | { | |
557 | nRead = yaffs_ReadDataFromFile(obj,buf,pos,nbyte); | |
558 | if(nRead >= 0) | |
559 | { | |
560 | h->position = pos + nRead; | |
561 | } | |
562 | else | |
563 | { | |
564 | //todo error | |
565 | } | |
566 | } | |
567 | else | |
568 | { | |
569 | nRead = 0; | |
570 | } | |
571 | ||
572 | } | |
573 | ||
574 | yaffsfs_Unlock(); | |
575 | ||
576 | ||
577 | return (nRead >= 0) ? nRead : -1; | |
578 | ||
579 | } | |
580 | ||
581 | int yaffs_write(int fd, const void *buf, unsigned int nbyte) | |
582 | { | |
583 | yaffsfs_Handle *h = NULL; | |
584 | yaffs_Object *obj = NULL; | |
585 | int pos = 0; | |
586 | int nWritten = -1; | |
587 | int writeThrough = 0; | |
588 | ||
589 | yaffsfs_Lock(); | |
590 | h = yaffsfs_GetHandlePointer(fd); | |
591 | obj = yaffsfs_GetHandleObject(fd); | |
592 | ||
593 | if(!h || !obj) | |
594 | { | |
595 | // bad handle | |
596 | yaffsfs_SetError(-EBADF); | |
597 | } | |
598 | else if( h && obj && h->readOnly) | |
599 | { | |
600 | // todo error | |
601 | } | |
602 | else if( h && obj) | |
603 | { | |
604 | if(h->append) | |
605 | { | |
606 | pos = yaffs_GetObjectFileLength(obj); | |
607 | } | |
608 | else | |
609 | { | |
610 | pos = h->position; | |
611 | } | |
612 | ||
613 | nWritten = yaffs_WriteDataToFile(obj,buf,pos,nbyte,writeThrough); | |
614 | ||
615 | if(nWritten >= 0) | |
616 | { | |
617 | h->position = pos + nWritten; | |
618 | } | |
619 | else | |
620 | { | |
621 | //todo error | |
622 | } | |
623 | ||
624 | } | |
625 | ||
626 | yaffsfs_Unlock(); | |
627 | ||
628 | ||
629 | return (nWritten >= 0) ? nWritten : -1; | |
630 | ||
631 | } | |
632 | ||
633 | int yaffs_truncate(int fd, off_t newSize) | |
634 | { | |
635 | yaffsfs_Handle *h = NULL; | |
636 | yaffs_Object *obj = NULL; | |
637 | int result = 0; | |
638 | ||
639 | yaffsfs_Lock(); | |
640 | h = yaffsfs_GetHandlePointer(fd); | |
641 | obj = yaffsfs_GetHandleObject(fd); | |
642 | ||
643 | if(!h || !obj) | |
644 | { | |
645 | // bad handle | |
646 | yaffsfs_SetError(-EBADF); | |
647 | } | |
648 | else | |
649 | { | |
650 | // resize the file | |
651 | result = yaffs_ResizeFile(obj,newSize); | |
652 | } | |
653 | yaffsfs_Unlock(); | |
654 | ||
655 | ||
656 | return (result) ? 0 : -1; | |
657 | ||
658 | } | |
659 | ||
660 | off_t yaffs_lseek(int fd, off_t offset, int whence) | |
661 | { | |
662 | yaffsfs_Handle *h = NULL; | |
663 | yaffs_Object *obj = NULL; | |
664 | int pos = -1; | |
665 | int fSize = -1; | |
666 | ||
667 | yaffsfs_Lock(); | |
668 | h = yaffsfs_GetHandlePointer(fd); | |
669 | obj = yaffsfs_GetHandleObject(fd); | |
670 | ||
671 | if(!h || !obj) | |
672 | { | |
673 | // bad handle | |
674 | yaffsfs_SetError(-EBADF); | |
675 | } | |
676 | else if(whence == SEEK_SET) | |
677 | { | |
678 | if(offset >= 0) | |
679 | { | |
680 | pos = offset; | |
681 | } | |
682 | } | |
683 | else if(whence == SEEK_CUR) | |
684 | { | |
685 | if( (h->position + offset) >= 0) | |
686 | { | |
687 | pos = (h->position + offset); | |
688 | } | |
689 | } | |
690 | else if(whence == SEEK_END) | |
691 | { | |
692 | fSize = yaffs_GetObjectFileLength(obj); | |
693 | if(fSize >= 0 && (fSize + offset) >= 0) | |
694 | { | |
695 | pos = fSize + offset; | |
696 | } | |
697 | } | |
698 | ||
699 | if(pos >= 0) | |
700 | { | |
701 | h->position = pos; | |
702 | } | |
703 | else | |
704 | { | |
705 | // todo error | |
706 | } | |
707 | ||
708 | ||
709 | yaffsfs_Unlock(); | |
710 | ||
711 | return pos; | |
712 | } | |
713 | ||
714 | ||
715 | int yaffsfs_DoUnlink(const char *path,int isDirectory) | |
716 | { | |
717 | yaffs_Object *dir = NULL; | |
718 | yaffs_Object *obj = NULL; | |
719 | char *name; | |
720 | int result = YAFFS_FAIL; | |
721 | ||
722 | yaffsfs_Lock(); | |
723 | ||
724 | obj = yaffsfs_FindObject(NULL,path,0); | |
725 | dir = yaffsfs_FindDirectory(NULL,path,&name,0); | |
726 | if(!dir) | |
727 | { | |
728 | yaffsfs_SetError(-ENOTDIR); | |
729 | } | |
730 | else if(!obj) | |
731 | { | |
732 | yaffsfs_SetError(-ENOENT); | |
733 | } | |
734 | else if(!isDirectory && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) | |
735 | { | |
736 | yaffsfs_SetError(-EISDIR); | |
737 | } | |
738 | else if(isDirectory && obj->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) | |
739 | { | |
740 | yaffsfs_SetError(-ENOTDIR); | |
741 | } | |
742 | else | |
743 | { | |
744 | result = yaffs_Unlink(dir,name); | |
745 | ||
746 | if(result == YAFFS_FAIL && isDirectory) | |
747 | { | |
748 | yaffsfs_SetError(-ENOTEMPTY); | |
749 | } | |
750 | } | |
751 | ||
752 | yaffsfs_Unlock(); | |
753 | ||
754 | // todo error | |
755 | ||
756 | return (result == YAFFS_FAIL) ? -1 : 0; | |
757 | } | |
758 | int yaffs_rmdir(const char *path) | |
759 | { | |
760 | return yaffsfs_DoUnlink(path,1); | |
761 | } | |
762 | ||
763 | int yaffs_unlink(const char *path) | |
764 | { | |
765 | return yaffsfs_DoUnlink(path,0); | |
766 | } | |
767 | ||
768 | int yaffs_rename(const char *oldPath, const char *newPath) | |
769 | { | |
770 | yaffs_Object *olddir = NULL; | |
771 | yaffs_Object *newdir = NULL; | |
772 | yaffs_Object *obj = NULL; | |
773 | char *oldname; | |
774 | char *newname; | |
775 | int result= YAFFS_FAIL; | |
776 | int renameAllowed = 1; | |
777 | ||
778 | yaffsfs_Lock(); | |
779 | ||
780 | olddir = yaffsfs_FindDirectory(NULL,oldPath,&oldname,0); | |
781 | newdir = yaffsfs_FindDirectory(NULL,newPath,&newname,0); | |
782 | obj = yaffsfs_FindObject(NULL,oldPath,0); | |
783 | ||
784 | if(!olddir || !newdir || !obj) | |
785 | { | |
786 | // bad file | |
787 | yaffsfs_SetError(-EBADF); | |
788 | renameAllowed = 0; | |
789 | } | |
790 | else if(olddir->myDev != newdir->myDev) | |
791 | { | |
792 | // oops must be on same device | |
793 | // todo error | |
794 | yaffsfs_SetError(-EXDEV); | |
795 | renameAllowed = 0; | |
796 | } | |
797 | else if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) | |
798 | { | |
799 | // It is a directory, check that it is not being renamed to | |
800 | // being its own decendent. | |
801 | // Do this by tracing from the new directory back to the root, checking for obj | |
802 | ||
803 | yaffs_Object *xx = newdir; | |
804 | ||
805 | while( renameAllowed && xx) | |
806 | { | |
807 | if(xx == obj) | |
808 | { | |
809 | renameAllowed = 0; | |
810 | } | |
811 | xx = xx->parent; | |
812 | } | |
813 | if(!renameAllowed) yaffsfs_SetError(-EACCESS); | |
814 | } | |
815 | ||
816 | if(renameAllowed) | |
817 | { | |
818 | result = yaffs_RenameObject(olddir,oldname,newdir,newname); | |
819 | } | |
820 | ||
821 | yaffsfs_Unlock(); | |
822 | ||
823 | return (result == YAFFS_FAIL) ? -1 : 0; | |
824 | } | |
825 | ||
826 | ||
827 | static int yaffsfs_DoStat(yaffs_Object *obj,struct yaffs_stat *buf) | |
828 | { | |
829 | int retVal = -1; | |
830 | ||
831 | if(obj) | |
832 | { | |
833 | obj = yaffs_GetEquivalentObject(obj); | |
834 | } | |
835 | ||
836 | if(obj && buf) | |
837 | { | |
838 | buf->st_dev = (int)obj->myDev->genericDevice; | |
839 | buf->st_ino = obj->objectId; | |
840 | buf->st_mode = obj->yst_mode & ~S_IFMT; // clear out file type bits | |
841 | ||
842 | if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) | |
843 | { | |
844 | buf->st_mode |= S_IFDIR; | |
845 | } | |
846 | else if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) | |
847 | { | |
848 | buf->st_mode |= S_IFLNK; | |
849 | } | |
850 | else if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) | |
851 | { | |
852 | buf->st_mode |= S_IFREG; | |
853 | } | |
854 | ||
855 | buf->st_nlink = yaffs_GetObjectLinkCount(obj); | |
856 | buf->st_uid = 0; | |
857 | buf->st_gid = 0;; | |
858 | buf->st_rdev = obj->yst_rdev; | |
859 | buf->st_size = yaffs_GetObjectFileLength(obj); | |
860 | buf->st_blksize = obj->myDev->nDataBytesPerChunk; | |
861 | buf->st_blocks = (buf->st_size + buf->st_blksize -1)/buf->st_blksize; | |
862 | buf->yst_atime = obj->yst_atime; | |
863 | buf->yst_ctime = obj->yst_ctime; | |
864 | buf->yst_mtime = obj->yst_mtime; | |
865 | retVal = 0; | |
866 | } | |
867 | return retVal; | |
868 | } | |
869 | ||
870 | static int yaffsfs_DoStatOrLStat(const char *path, struct yaffs_stat *buf,int doLStat) | |
871 | { | |
872 | yaffs_Object *obj; | |
873 | ||
874 | int retVal = -1; | |
875 | ||
876 | yaffsfs_Lock(); | |
877 | obj = yaffsfs_FindObject(NULL,path,0); | |
878 | ||
879 | if(!doLStat && obj) | |
880 | { | |
881 | obj = yaffsfs_FollowLink(obj,0); | |
882 | } | |
883 | ||
884 | if(obj) | |
885 | { | |
886 | retVal = yaffsfs_DoStat(obj,buf); | |
887 | } | |
888 | else | |
889 | { | |
890 | // todo error not found | |
891 | yaffsfs_SetError(-ENOENT); | |
892 | } | |
893 | ||
894 | yaffsfs_Unlock(); | |
895 | ||
896 | return retVal; | |
897 | ||
898 | } | |
899 | ||
900 | int yaffs_stat(const char *path, struct yaffs_stat *buf) | |
901 | { | |
902 | return yaffsfs_DoStatOrLStat(path,buf,0); | |
903 | } | |
904 | ||
905 | int yaffs_lstat(const char *path, struct yaffs_stat *buf) | |
906 | { | |
907 | return yaffsfs_DoStatOrLStat(path,buf,1); | |
908 | } | |
909 | ||
910 | int yaffs_fstat(int fd, struct yaffs_stat *buf) | |
911 | { | |
912 | yaffs_Object *obj; | |
913 | ||
914 | int retVal = -1; | |
915 | ||
916 | yaffsfs_Lock(); | |
917 | obj = yaffsfs_GetHandleObject(fd); | |
918 | ||
919 | if(obj) | |
920 | { | |
921 | retVal = yaffsfs_DoStat(obj,buf); | |
922 | } | |
923 | else | |
924 | { | |
925 | // bad handle | |
926 | yaffsfs_SetError(-EBADF); | |
927 | } | |
928 | ||
929 | yaffsfs_Unlock(); | |
930 | ||
931 | return retVal; | |
932 | } | |
933 | ||
934 | static int yaffsfs_DoChMod(yaffs_Object *obj,mode_t mode) | |
935 | { | |
90ef117b | 936 | int result = YAFFS_FAIL; |
0e8cc8bd WJ |
937 | |
938 | if(obj) | |
939 | { | |
940 | obj = yaffs_GetEquivalentObject(obj); | |
941 | } | |
942 | ||
943 | if(obj) | |
944 | { | |
945 | obj->yst_mode = mode; | |
946 | obj->dirty = 1; | |
947 | result = yaffs_FlushFile(obj,0); | |
948 | } | |
949 | ||
950 | return result == YAFFS_OK ? 0 : -1; | |
951 | } | |
952 | ||
953 | ||
954 | int yaffs_chmod(const char *path, mode_t mode) | |
955 | { | |
956 | yaffs_Object *obj; | |
957 | ||
958 | int retVal = -1; | |
959 | ||
960 | yaffsfs_Lock(); | |
961 | obj = yaffsfs_FindObject(NULL,path,0); | |
962 | ||
963 | if(obj) | |
964 | { | |
965 | retVal = yaffsfs_DoChMod(obj,mode); | |
966 | } | |
967 | else | |
968 | { | |
969 | // todo error not found | |
970 | yaffsfs_SetError(-ENOENT); | |
971 | } | |
972 | ||
973 | yaffsfs_Unlock(); | |
974 | ||
975 | return retVal; | |
976 | ||
977 | } | |
978 | ||
979 | ||
980 | int yaffs_fchmod(int fd, mode_t mode) | |
981 | { | |
982 | yaffs_Object *obj; | |
983 | ||
984 | int retVal = -1; | |
985 | ||
986 | yaffsfs_Lock(); | |
987 | obj = yaffsfs_GetHandleObject(fd); | |
988 | ||
989 | if(obj) | |
990 | { | |
991 | retVal = yaffsfs_DoChMod(obj,mode); | |
992 | } | |
993 | else | |
994 | { | |
995 | // bad handle | |
996 | yaffsfs_SetError(-EBADF); | |
997 | } | |
998 | ||
999 | yaffsfs_Unlock(); | |
1000 | ||
1001 | return retVal; | |
1002 | } | |
1003 | ||
1004 | ||
1005 | int yaffs_mkdir(const char *path, mode_t mode) | |
1006 | { | |
1007 | yaffs_Object *parent = NULL; | |
1008 | yaffs_Object *dir = NULL; | |
1009 | char *name; | |
1010 | int retVal= -1; | |
1011 | ||
1012 | yaffsfs_Lock(); | |
1013 | parent = yaffsfs_FindDirectory(NULL,path,&name,0); | |
1014 | if(parent) | |
1015 | dir = yaffs_MknodDirectory(parent,name,mode,0,0); | |
1016 | if(dir) | |
1017 | { | |
1018 | retVal = 0; | |
1019 | } | |
1020 | else | |
1021 | { | |
1022 | yaffsfs_SetError(-ENOSPC); // just assume no space for now | |
1023 | retVal = -1; | |
1024 | } | |
1025 | ||
1026 | yaffsfs_Unlock(); | |
1027 | ||
1028 | return retVal; | |
1029 | } | |
1030 | ||
1031 | int yaffs_mount(const char *path) | |
1032 | { | |
1033 | int retVal=-1; | |
1034 | int result=YAFFS_FAIL; | |
1035 | yaffs_Device *dev=NULL; | |
1036 | char *dummy; | |
1037 | ||
1038 | T(YAFFS_TRACE_ALWAYS,("yaffs: Mounting %s\n",path)); | |
1039 | ||
1040 | yaffsfs_Lock(); | |
1041 | dev = yaffsfs_FindDevice(path,&dummy); | |
1042 | if(dev) | |
1043 | { | |
1044 | if(!dev->isMounted) | |
1045 | { | |
1046 | result = yaffs_GutsInitialise(dev); | |
1047 | if(result == YAFFS_FAIL) | |
1048 | { | |
1049 | // todo error - mount failed | |
1050 | yaffsfs_SetError(-ENOMEM); | |
1051 | } | |
1052 | retVal = result ? 0 : -1; | |
1053 | ||
1054 | } | |
1055 | else | |
1056 | { | |
1057 | //todo error - already mounted. | |
1058 | yaffsfs_SetError(-EBUSY); | |
1059 | } | |
1060 | } | |
1061 | else | |
1062 | { | |
1063 | // todo error - no device | |
1064 | yaffsfs_SetError(-ENODEV); | |
1065 | } | |
1066 | yaffsfs_Unlock(); | |
1067 | return retVal; | |
1068 | ||
1069 | } | |
1070 | ||
1071 | int yaffs_unmount(const char *path) | |
1072 | { | |
1073 | int retVal=-1; | |
1074 | yaffs_Device *dev=NULL; | |
1075 | char *dummy; | |
1076 | ||
1077 | yaffsfs_Lock(); | |
1078 | dev = yaffsfs_FindDevice(path,&dummy); | |
1079 | if(dev) | |
1080 | { | |
1081 | if(dev->isMounted) | |
1082 | { | |
1083 | int i; | |
1084 | int inUse; | |
1085 | ||
1086 | yaffs_FlushEntireDeviceCache(dev); | |
1087 | yaffs_CheckpointSave(dev); | |
1088 | ||
1089 | for(i = inUse = 0; i < YAFFSFS_N_HANDLES && !inUse; i++) | |
1090 | { | |
1091 | if(yaffsfs_handle[i].inUse && yaffsfs_handle[i].obj->myDev == dev) | |
1092 | { | |
1093 | inUse = 1; // the device is in use, can't unmount | |
1094 | } | |
1095 | } | |
1096 | ||
1097 | if(!inUse) | |
1098 | { | |
1099 | yaffs_Deinitialise(dev); | |
1100 | ||
1101 | retVal = 0; | |
1102 | } | |
1103 | else | |
1104 | { | |
1105 | // todo error can't unmount as files are open | |
1106 | yaffsfs_SetError(-EBUSY); | |
1107 | } | |
1108 | ||
1109 | } | |
1110 | else | |
1111 | { | |
1112 | //todo error - not mounted. | |
1113 | yaffsfs_SetError(-EINVAL); | |
1114 | ||
1115 | } | |
1116 | } | |
1117 | else | |
1118 | { | |
1119 | // todo error - no device | |
1120 | yaffsfs_SetError(-ENODEV); | |
1121 | } | |
1122 | yaffsfs_Unlock(); | |
1123 | return retVal; | |
1124 | ||
1125 | } | |
1126 | ||
1127 | loff_t yaffs_freespace(const char *path) | |
1128 | { | |
1129 | loff_t retVal=-1; | |
1130 | yaffs_Device *dev=NULL; | |
1131 | char *dummy; | |
1132 | ||
1133 | yaffsfs_Lock(); | |
1134 | dev = yaffsfs_FindDevice(path,&dummy); | |
1135 | if(dev && dev->isMounted) | |
1136 | { | |
1137 | retVal = yaffs_GetNumberOfFreeChunks(dev); | |
1138 | retVal *= dev->nDataBytesPerChunk; | |
1139 | ||
1140 | } | |
1141 | else | |
1142 | { | |
1143 | yaffsfs_SetError(-EINVAL); | |
1144 | } | |
1145 | ||
1146 | yaffsfs_Unlock(); | |
1147 | return retVal; | |
1148 | } | |
1149 | ||
1150 | ||
1151 | ||
1152 | void yaffs_initialise(yaffsfs_DeviceConfiguration *cfgList) | |
1153 | { | |
1154 | ||
1155 | yaffsfs_DeviceConfiguration *cfg; | |
1156 | ||
1157 | yaffsfs_configurationList = cfgList; | |
1158 | ||
1159 | yaffsfs_InitHandles(); | |
1160 | ||
1161 | cfg = yaffsfs_configurationList; | |
1162 | ||
1163 | while(cfg && cfg->prefix && cfg->dev) | |
1164 | { | |
1165 | cfg->dev->isMounted = 0; | |
1166 | cfg->dev->removeObjectCallback = yaffsfs_RemoveObjectCallback; | |
1167 | cfg++; | |
1168 | } | |
0e8cc8bd WJ |
1169 | } |
1170 | ||
1171 | ||
1172 | // | |
1173 | // Directory search stuff. | |
1174 | ||
1175 | // | |
1176 | // Directory search context | |
1177 | // | |
1178 | // NB this is an opaque structure. | |
1179 | ||
1180 | ||
1181 | typedef struct | |
1182 | { | |
1183 | __u32 magic; | |
1184 | yaffs_dirent de; /* directory entry being used by this dsc */ | |
1185 | char name[NAME_MAX+1]; /* name of directory being searched */ | |
1186 | yaffs_Object *dirObj; /* ptr to directory being searched */ | |
1187 | yaffs_Object *nextReturn; /* obj to be returned by next readddir */ | |
1188 | int offset; | |
1189 | struct list_head others; | |
1190 | } yaffsfs_DirectorySearchContext; | |
1191 | ||
1192 | ||
1193 | ||
1194 | static struct list_head search_contexts; | |
1195 | ||
1196 | ||
1197 | static void yaffsfs_SetDirRewound(yaffsfs_DirectorySearchContext *dsc) | |
1198 | { | |
1199 | if(dsc && | |
1200 | dsc->dirObj && | |
1201 | dsc->dirObj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY){ | |
1202 | ||
1203 | dsc->offset = 0; | |
1204 | ||
1205 | if( list_empty(&dsc->dirObj->variant.directoryVariant.children)){ | |
1206 | dsc->nextReturn = NULL; | |
1207 | } else { | |
1208 | dsc->nextReturn = list_entry(dsc->dirObj->variant.directoryVariant.children.next, | |
1209 | yaffs_Object,siblings); | |
1210 | } | |
1211 | } else { | |
1212 | /* Hey someone isn't playing nice! */ | |
1213 | } | |
1214 | } | |
1215 | ||
1216 | static void yaffsfs_DirAdvance(yaffsfs_DirectorySearchContext *dsc) | |
1217 | { | |
1218 | if(dsc && | |
1219 | dsc->dirObj && | |
1220 | dsc->dirObj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY){ | |
1221 | ||
1222 | if( dsc->nextReturn == NULL || | |
1223 | list_empty(&dsc->dirObj->variant.directoryVariant.children)){ | |
1224 | dsc->nextReturn = NULL; | |
1225 | } else { | |
1226 | struct list_head *next = dsc->nextReturn->siblings.next; | |
1227 | ||
1228 | if( next == &dsc->dirObj->variant.directoryVariant.children) | |
1229 | dsc->nextReturn = NULL; /* end of list */ | |
1230 | else | |
1231 | dsc->nextReturn = list_entry(next,yaffs_Object,siblings); | |
1232 | } | |
1233 | } else { | |
1234 | /* Hey someone isn't playing nice! */ | |
1235 | } | |
1236 | } | |
1237 | ||
1238 | static void yaffsfs_RemoveObjectCallback(yaffs_Object *obj) | |
1239 | { | |
1240 | ||
1241 | struct list_head *i; | |
1242 | yaffsfs_DirectorySearchContext *dsc; | |
1243 | ||
1244 | /* if search contexts not initilised then skip */ | |
1245 | if(!search_contexts.next) | |
1246 | return; | |
1247 | ||
1248 | /* Iteratethrough the directory search contexts. | |
1249 | * If any are the one being removed, then advance the dsc to | |
1250 | * the next one to prevent a hanging ptr. | |
1251 | */ | |
1252 | list_for_each(i, &search_contexts) { | |
1253 | if (i) { | |
1254 | dsc = list_entry(i, yaffsfs_DirectorySearchContext,others); | |
1255 | if(dsc->nextReturn == obj) | |
1256 | yaffsfs_DirAdvance(dsc); | |
1257 | } | |
1258 | } | |
1259 | ||
1260 | } | |
1261 | ||
1262 | yaffs_DIR *yaffs_opendir(const char *dirname) | |
1263 | { | |
1264 | yaffs_DIR *dir = NULL; | |
1265 | yaffs_Object *obj = NULL; | |
1266 | yaffsfs_DirectorySearchContext *dsc = NULL; | |
1267 | ||
1268 | yaffsfs_Lock(); | |
1269 | ||
1270 | obj = yaffsfs_FindObject(NULL,dirname,0); | |
1271 | ||
1272 | if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) | |
1273 | { | |
1274 | ||
1275 | dsc = YMALLOC(sizeof(yaffsfs_DirectorySearchContext)); | |
1276 | dir = (yaffs_DIR *)dsc; | |
1277 | if(dsc) | |
1278 | { | |
1279 | memset(dsc,0,sizeof(yaffsfs_DirectorySearchContext)); | |
1280 | dsc->magic = YAFFS_MAGIC; | |
1281 | dsc->dirObj = obj; | |
1282 | strncpy(dsc->name,dirname,NAME_MAX); | |
1283 | INIT_LIST_HEAD(&dsc->others); | |
1284 | ||
1285 | if(!search_contexts.next) | |
1286 | INIT_LIST_HEAD(&search_contexts); | |
1287 | ||
1288 | list_add(&dsc->others,&search_contexts); | |
1289 | yaffsfs_SetDirRewound(dsc); } | |
1290 | ||
1291 | } | |
1292 | ||
1293 | yaffsfs_Unlock(); | |
1294 | ||
1295 | return dir; | |
1296 | } | |
1297 | ||
1298 | struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp) | |
1299 | { | |
1300 | yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp; | |
1301 | struct yaffs_dirent *retVal = NULL; | |
1302 | ||
1303 | yaffsfs_Lock(); | |
1304 | ||
1305 | if(dsc && dsc->magic == YAFFS_MAGIC){ | |
1306 | yaffsfs_SetError(0); | |
1307 | if(dsc->nextReturn){ | |
1308 | dsc->de.d_ino = yaffs_GetEquivalentObject(dsc->nextReturn)->objectId; | |
1309 | dsc->de.d_dont_use = (unsigned)dsc->nextReturn; | |
1310 | dsc->de.d_off = dsc->offset++; | |
1311 | yaffs_GetObjectName(dsc->nextReturn,dsc->de.d_name,NAME_MAX); | |
1312 | if(strlen(dsc->de.d_name) == 0) | |
1313 | { | |
1314 | // this should not happen! | |
1315 | strcpy(dsc->de.d_name,"zz"); | |
1316 | } | |
1317 | dsc->de.d_reclen = sizeof(struct yaffs_dirent); | |
1318 | retVal = &dsc->de; | |
1319 | yaffsfs_DirAdvance(dsc); | |
1320 | } else | |
1321 | retVal = NULL; | |
1322 | } | |
1323 | else | |
1324 | { | |
1325 | yaffsfs_SetError(-EBADF); | |
1326 | } | |
1327 | ||
1328 | yaffsfs_Unlock(); | |
1329 | ||
1330 | return retVal; | |
1331 | ||
1332 | } | |
1333 | ||
1334 | ||
1335 | void yaffs_rewinddir(yaffs_DIR *dirp) | |
1336 | { | |
1337 | yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp; | |
1338 | ||
1339 | yaffsfs_Lock(); | |
1340 | ||
1341 | yaffsfs_SetDirRewound(dsc); | |
1342 | ||
1343 | yaffsfs_Unlock(); | |
1344 | } | |
1345 | ||
1346 | ||
1347 | int yaffs_closedir(yaffs_DIR *dirp) | |
1348 | { | |
1349 | yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp; | |
1350 | ||
1351 | yaffsfs_Lock(); | |
1352 | dsc->magic = 0; | |
1353 | list_del(&dsc->others); /* unhook from list */ | |
1354 | YFREE(dsc); | |
1355 | yaffsfs_Unlock(); | |
1356 | return 0; | |
1357 | } | |
1358 | ||
1359 | // end of directory stuff | |
1360 | ||
1361 | ||
1362 | int yaffs_symlink(const char *oldpath, const char *newpath) | |
1363 | { | |
1364 | yaffs_Object *parent = NULL; | |
1365 | yaffs_Object *obj; | |
1366 | char *name; | |
1367 | int retVal= -1; | |
1368 | int mode = 0; // ignore for now | |
1369 | ||
1370 | yaffsfs_Lock(); | |
1371 | parent = yaffsfs_FindDirectory(NULL,newpath,&name,0); | |
1372 | obj = yaffs_MknodSymLink(parent,name,mode,0,0,oldpath); | |
1373 | if(obj) | |
1374 | { | |
1375 | retVal = 0; | |
1376 | } | |
1377 | else | |
1378 | { | |
1379 | yaffsfs_SetError(-ENOSPC); // just assume no space for now | |
1380 | retVal = -1; | |
1381 | } | |
1382 | ||
1383 | yaffsfs_Unlock(); | |
1384 | ||
1385 | return retVal; | |
1386 | ||
1387 | } | |
1388 | ||
1389 | int yaffs_readlink(const char *path, char *buf, int bufsiz) | |
1390 | { | |
1391 | yaffs_Object *obj = NULL; | |
1392 | int retVal; | |
1393 | ||
1394 | ||
1395 | yaffsfs_Lock(); | |
1396 | ||
1397 | obj = yaffsfs_FindObject(NULL,path,0); | |
1398 | ||
1399 | if(!obj) | |
1400 | { | |
1401 | yaffsfs_SetError(-ENOENT); | |
1402 | retVal = -1; | |
1403 | } | |
1404 | else if(obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK) | |
1405 | { | |
1406 | yaffsfs_SetError(-EINVAL); | |
1407 | retVal = -1; | |
1408 | } | |
1409 | else | |
1410 | { | |
1411 | char *alias = obj->variant.symLinkVariant.alias; | |
1412 | memset(buf,0,bufsiz); | |
1413 | strncpy(buf,alias,bufsiz - 1); | |
1414 | retVal = 0; | |
1415 | } | |
1416 | yaffsfs_Unlock(); | |
1417 | return retVal; | |
1418 | } | |
1419 | ||
1420 | int yaffs_link(const char *oldpath, const char *newpath) | |
1421 | { | |
1422 | // Creates a link called newpath to existing oldpath | |
1423 | yaffs_Object *obj = NULL; | |
1424 | yaffs_Object *target = NULL; | |
1425 | int retVal = 0; | |
1426 | ||
1427 | ||
1428 | yaffsfs_Lock(); | |
1429 | ||
1430 | obj = yaffsfs_FindObject(NULL,oldpath,0); | |
1431 | target = yaffsfs_FindObject(NULL,newpath,0); | |
1432 | ||
1433 | if(!obj) | |
1434 | { | |
1435 | yaffsfs_SetError(-ENOENT); | |
1436 | retVal = -1; | |
1437 | } | |
1438 | else if(target) | |
1439 | { | |
1440 | yaffsfs_SetError(-EEXIST); | |
1441 | retVal = -1; | |
1442 | } | |
1443 | else | |
1444 | { | |
1445 | yaffs_Object *newdir = NULL; | |
1446 | yaffs_Object *link = NULL; | |
1447 | ||
1448 | char *newname; | |
1449 | ||
1450 | newdir = yaffsfs_FindDirectory(NULL,newpath,&newname,0); | |
1451 | ||
1452 | if(!newdir) | |
1453 | { | |
1454 | yaffsfs_SetError(-ENOTDIR); | |
1455 | retVal = -1; | |
1456 | } | |
1457 | else if(newdir->myDev != obj->myDev) | |
1458 | { | |
1459 | yaffsfs_SetError(-EXDEV); | |
1460 | retVal = -1; | |
1461 | } | |
1462 | if(newdir && strlen(newname) > 0) | |
1463 | { | |
1464 | link = yaffs_Link(newdir,newname,obj); | |
1465 | if(link) | |
1466 | retVal = 0; | |
1467 | else | |
1468 | { | |
1469 | yaffsfs_SetError(-ENOSPC); | |
1470 | retVal = -1; | |
1471 | } | |
1472 | ||
1473 | } | |
1474 | } | |
1475 | yaffsfs_Unlock(); | |
1476 | ||
1477 | return retVal; | |
1478 | } | |
1479 | ||
1480 | int yaffs_mknod(const char *pathname, mode_t mode, dev_t dev); | |
1481 | ||
1482 | int yaffs_DumpDevStruct(const char *path) | |
1483 | { | |
1484 | char *rest; | |
1485 | ||
1486 | yaffs_Object *obj = yaffsfs_FindRoot(path,&rest); | |
1487 | ||
1488 | if(obj) | |
1489 | { | |
1490 | yaffs_Device *dev = obj->myDev; | |
1491 | ||
1492 | printf("\n" | |
1493 | "nPageWrites.......... %d\n" | |
1494 | "nPageReads........... %d\n" | |
1495 | "nBlockErasures....... %d\n" | |
1496 | "nGCCopies............ %d\n" | |
1497 | "garbageCollections... %d\n" | |
1498 | "passiveGarbageColl'ns %d\n" | |
1499 | "\n", | |
1500 | dev->nPageWrites, | |
1501 | dev->nPageReads, | |
1502 | dev->nBlockErasures, | |
1503 | dev->nGCCopies, | |
1504 | dev->garbageCollections, | |
1505 | dev->passiveGarbageCollections | |
1506 | ); | |
1507 | ||
1508 | } | |
1509 | return 0; | |
1510 | } |