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Merge git://git.denx.de/u-boot-spi
[people/ms/u-boot.git] / fs / yaffs2 / yaffsfs.c
1 /*
2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
3 *
4 * Copyright (C) 2002-2011 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
14 #include <div64.h>
15 #include "yaffsfs.h"
16 #include "yaffs_guts.h"
17 #include "yaffscfg.h"
18 #include "yportenv.h"
19 #include "yaffs_trace.h"
20
21 #define YAFFSFS_MAX_SYMLINK_DEREFERENCES 5
22
23 #ifndef NULL
24 #define NULL ((void *)0)
25 #endif
26
27 /* YAFFSFS_RW_SIZE must be a power of 2 */
28 #define YAFFSFS_RW_SHIFT (13)
29 #define YAFFSFS_RW_SIZE (1<<YAFFSFS_RW_SHIFT)
30
31 /* Some forward references */
32 static struct yaffs_obj *yaffsfs_FindObject(struct yaffs_obj *relativeDirectory,
33 const YCHAR *path,
34 int symDepth, int getEquiv,
35 struct yaffs_obj **dirOut,
36 int *notDir, int *loop);
37
38 static void yaffsfs_RemoveObjectCallback(struct yaffs_obj *obj);
39
40 unsigned int yaffs_wr_attempts;
41
42 /*
43 * Handle management.
44 * There are open inodes in struct yaffsfs_Inode.
45 * There are open file descriptors in yaffsfs_FileDes.
46 * There are open handles in yaffsfs_FileDes.
47 *
48 * Things are structured this way to be like the Linux VFS model
49 * so that interactions with the yaffs guts calls are similar.
50 * That means more common code paths and less special code.
51 * That means better testing etc.
52 *
53 * We have 3 layers because:
54 * A handle is different than an fd because you can use dup()
55 * to create a new handle that accesses the *same* fd. The two
56 * handles will use the same offset (part of the fd). We only close
57 * down the fd when there are no more handles accessing it.
58 *
59 * More than one fd can currently access one file, but each fd
60 * has its own permsiions and offset.
61 */
62
63 struct yaffsfs_Inode {
64 int count; /* Number of handles accessing this inode */
65 struct yaffs_obj *iObj;
66 };
67
68 struct yaffsfs_FileDes {
69 u8 reading:1;
70 u8 writing:1;
71 u8 append:1;
72 u8 shareRead:1;
73 u8 shareWrite:1;
74 int inodeId:12; /* Index to corresponding yaffsfs_Inode */
75 int handleCount:10; /* Number of handles for this fd */
76 loff_t position; /* current position in file */
77 };
78
79 struct yaffsfs_Handle {
80 short int fdId;
81 short int useCount;
82 };
83
84
85 struct yaffsfs_DirSearchContxt {
86 struct yaffs_dirent de; /* directory entry */
87 YCHAR name[NAME_MAX + 1]; /* name of directory being searched */
88 struct yaffs_obj *dirObj; /* ptr to directory being searched */
89 struct yaffs_obj *nextReturn; /* obj returned by next readddir */
90 struct list_head others;
91 int offset:20;
92 unsigned inUse:1;
93 };
94
95 static struct yaffsfs_DirSearchContxt yaffsfs_dsc[YAFFSFS_N_DSC];
96 static struct yaffsfs_Inode yaffsfs_inode[YAFFSFS_N_HANDLES];
97 static struct yaffsfs_FileDes yaffsfs_fd[YAFFSFS_N_HANDLES];
98 static struct yaffsfs_Handle yaffsfs_handle[YAFFSFS_N_HANDLES];
99
100 static int yaffsfs_handlesInitialised;
101
102 unsigned yaffs_set_trace(unsigned tm)
103 {
104 yaffs_trace_mask = tm;
105 return yaffs_trace_mask;
106 }
107
108 unsigned yaffs_get_trace(void)
109 {
110 return yaffs_trace_mask;
111 }
112
113 /*
114 * yaffsfs_InitHandle
115 * Inilitalise handle management on start-up.
116 */
117
118 static void yaffsfs_InitHandles(void)
119 {
120 int i;
121 if (yaffsfs_handlesInitialised)
122 return;
123
124 memset(yaffsfs_inode, 0, sizeof(yaffsfs_inode));
125 memset(yaffsfs_fd, 0, sizeof(yaffsfs_fd));
126 memset(yaffsfs_handle, 0, sizeof(yaffsfs_handle));
127 memset(yaffsfs_dsc, 0, sizeof(yaffsfs_dsc));
128
129 for (i = 0; i < YAFFSFS_N_HANDLES; i++)
130 yaffsfs_fd[i].inodeId = -1;
131 for (i = 0; i < YAFFSFS_N_HANDLES; i++)
132 yaffsfs_handle[i].fdId = -1;
133 }
134
135 static struct yaffsfs_Handle *yaffsfs_HandleToPointer(int h)
136 {
137 if (h >= 0 && h < YAFFSFS_N_HANDLES)
138 return &yaffsfs_handle[h];
139 return NULL;
140 }
141
142 static struct yaffsfs_FileDes *yaffsfs_HandleToFileDes(int handle)
143 {
144 struct yaffsfs_Handle *h = yaffsfs_HandleToPointer(handle);
145
146 if (h && h->useCount > 0 && h->fdId >= 0 && h->fdId < YAFFSFS_N_HANDLES)
147 return &yaffsfs_fd[h->fdId];
148
149 return NULL;
150 }
151
152 static struct yaffsfs_Inode *yaffsfs_HandleToInode(int handle)
153 {
154 struct yaffsfs_FileDes *fd = yaffsfs_HandleToFileDes(handle);
155
156 if (fd && fd->handleCount > 0 &&
157 fd->inodeId >= 0 && fd->inodeId < YAFFSFS_N_HANDLES)
158 return &yaffsfs_inode[fd->inodeId];
159
160 return NULL;
161 }
162
163 static struct yaffs_obj *yaffsfs_HandleToObject(int handle)
164 {
165 struct yaffsfs_Inode *in = yaffsfs_HandleToInode(handle);
166
167 if (in)
168 return in->iObj;
169
170 return NULL;
171 }
172
173 /*
174 * yaffsfs_FindInodeIdForObject
175 * Find the inode entry for an object, if it exists.
176 */
177
178 static int yaffsfs_FindInodeIdForObject(struct yaffs_obj *obj)
179 {
180 int i;
181 int ret = -1;
182
183 if (obj)
184 obj = yaffs_get_equivalent_obj(obj);
185
186 /* Look for it in open inode table */
187 for (i = 0; i < YAFFSFS_N_HANDLES && ret < 0; i++) {
188 if (yaffsfs_inode[i].iObj == obj)
189 ret = i;
190 }
191 return ret;
192 }
193
194 /*
195 * yaffsfs_GetInodeIdForObject
196 * Grab an inode entry when opening a new inode.
197 */
198 static int yaffsfs_GetInodeIdForObject(struct yaffs_obj *obj)
199 {
200 int i;
201 int ret;
202 struct yaffsfs_Inode *in = NULL;
203
204 if (obj)
205 obj = yaffs_get_equivalent_obj(obj);
206
207 ret = yaffsfs_FindInodeIdForObject(obj);
208
209 for (i = 0; i < YAFFSFS_N_HANDLES && ret < 0; i++) {
210 if (!yaffsfs_inode[i].iObj)
211 ret = i;
212 }
213
214 if (ret >= 0) {
215 in = &yaffsfs_inode[ret];
216 if (!in->iObj)
217 in->count = 0;
218 in->iObj = obj;
219 in->count++;
220 }
221
222 return ret;
223 }
224
225 static int yaffsfs_CountHandles(struct yaffs_obj *obj)
226 {
227 int i = yaffsfs_FindInodeIdForObject(obj);
228
229 if (i >= 0)
230 return yaffsfs_inode[i].count;
231 else
232 return 0;
233 }
234
235 static void yaffsfs_ReleaseInode(struct yaffsfs_Inode *in)
236 {
237 struct yaffs_obj *obj;
238
239 obj = in->iObj;
240
241 if (obj->unlinked)
242 yaffs_del_obj(obj);
243
244 obj->my_inode = NULL;
245 in->iObj = NULL;
246
247 }
248
249 static void yaffsfs_PutInode(int inodeId)
250 {
251 if (inodeId >= 0 && inodeId < YAFFSFS_N_HANDLES) {
252 struct yaffsfs_Inode *in = &yaffsfs_inode[inodeId];
253 in->count--;
254 if (in->count <= 0) {
255 yaffsfs_ReleaseInode(in);
256 in->count = 0;
257 }
258 }
259 }
260
261 static int yaffsfs_NewHandle(struct yaffsfs_Handle **hptr)
262 {
263 int i;
264 struct yaffsfs_Handle *h;
265
266 for (i = 0; i < YAFFSFS_N_HANDLES; i++) {
267 h = &yaffsfs_handle[i];
268 if (h->useCount < 1) {
269 memset(h, 0, sizeof(struct yaffsfs_Handle));
270 h->fdId = -1;
271 h->useCount = 1;
272 if (hptr)
273 *hptr = h;
274 return i;
275 }
276 }
277 return -1;
278 }
279
280 static int yaffsfs_NewHandleAndFileDes(void)
281 {
282 int i;
283 struct yaffsfs_FileDes *fd;
284 struct yaffsfs_Handle *h = NULL;
285 int handle = yaffsfs_NewHandle(&h);
286
287 if (handle < 0)
288 return -1;
289
290 for (i = 0; i < YAFFSFS_N_HANDLES; i++) {
291 fd = &yaffsfs_fd[i];
292 if (fd->handleCount < 1) {
293 memset(fd, 0, sizeof(struct yaffsfs_FileDes));
294 fd->inodeId = -1;
295 fd->handleCount = 1;
296 h->fdId = i;
297 return handle;
298 }
299 }
300
301 /* Dump the handle because we could not get a fd */
302 h->useCount = 0;
303 return -1;
304 }
305
306 /*
307 * yaffs_get_handle
308 * Increase use of handle when reading/writing a file
309 * Also gets the file descriptor.
310 */
311
312 static int yaffsfs_GetHandle(int handle)
313 {
314 struct yaffsfs_Handle *h = yaffsfs_HandleToPointer(handle);
315
316 if (h && h->useCount > 0) {
317 h->useCount++;
318 return 0;
319 }
320 return -1;
321 }
322
323 /*
324 * yaffs_put_handle
325 * Let go of a handle when closing a file or aborting an open or
326 * ending a read or write.
327 */
328
329 static int yaffsfs_PutFileDes(int fdId)
330 {
331 struct yaffsfs_FileDes *fd;
332
333 if (fdId >= 0 && fdId < YAFFSFS_N_HANDLES) {
334 fd = &yaffsfs_fd[fdId];
335 fd->handleCount--;
336 if (fd->handleCount < 1) {
337 if (fd->inodeId >= 0) {
338 yaffsfs_PutInode(fd->inodeId);
339 fd->inodeId = -1;
340 }
341 }
342 }
343 return 0;
344 }
345
346 static int yaffsfs_PutHandle(int handle)
347 {
348 struct yaffsfs_Handle *h = yaffsfs_HandleToPointer(handle);
349
350 if (h && h->useCount > 0) {
351 h->useCount--;
352 if (h->useCount < 1) {
353 yaffsfs_PutFileDes(h->fdId);
354 h->fdId = -1;
355 }
356 }
357
358 return 0;
359 }
360
361 static void yaffsfs_BreakDeviceHandles(struct yaffs_dev *dev)
362 {
363 struct yaffsfs_FileDes *fd;
364 struct yaffsfs_Handle *h;
365 struct yaffs_obj *obj;
366 int i;
367 for (i = 0; i < YAFFSFS_N_HANDLES; i++) {
368 h = yaffsfs_HandleToPointer(i);
369 fd = yaffsfs_HandleToFileDes(i);
370 obj = yaffsfs_HandleToObject(i);
371 if (h && h->useCount > 0) {
372 h->useCount = 0;
373 h->fdId = 0;
374 }
375 if (fd && fd->handleCount > 0 && obj && obj->my_dev == dev) {
376 fd->handleCount = 0;
377 yaffsfs_PutInode(fd->inodeId);
378 fd->inodeId = -1;
379 }
380 }
381 }
382
383 /*
384 * Stuff to handle names.
385 */
386 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
387
388 static int yaffs_toupper(YCHAR a)
389 {
390 if (a >= 'a' && a <= 'z')
391 return (a - 'a') + 'A';
392 else
393 return a;
394 }
395
396 int yaffsfs_Match(YCHAR a, YCHAR b)
397 {
398 return (yaffs_toupper(a) == yaffs_toupper(b));
399 }
400 #else
401 int yaffsfs_Match(YCHAR a, YCHAR b)
402 {
403 /* case sensitive */
404 return (a == b);
405 }
406 #endif
407
408 int yaffsfs_IsPathDivider(YCHAR ch)
409 {
410 const YCHAR *str = YAFFS_PATH_DIVIDERS;
411
412 while (*str) {
413 if (*str == ch)
414 return 1;
415 str++;
416 }
417
418 return 0;
419 }
420
421 int yaffsfs_CheckNameLength(const char *name)
422 {
423 int retVal = 0;
424
425 int nameLength = yaffs_strnlen(name, YAFFS_MAX_NAME_LENGTH + 1);
426
427 if (nameLength == 0) {
428 yaffsfs_SetError(-ENOENT);
429 retVal = -1;
430 } else if (nameLength > YAFFS_MAX_NAME_LENGTH) {
431 yaffsfs_SetError(-ENAMETOOLONG);
432 retVal = -1;
433 }
434
435 return retVal;
436 }
437
438 static int yaffsfs_alt_dir_path(const YCHAR *path, YCHAR **ret_path)
439 {
440 YCHAR *alt_path = NULL;
441 int path_length;
442 int i;
443
444 /*
445 * We don't have a definition for max path length.
446 * We will use 3 * max name length instead.
447 */
448 *ret_path = NULL;
449 path_length = yaffs_strnlen(path, (YAFFS_MAX_NAME_LENGTH + 1) * 3 + 1);
450
451 /* If the last character is a path divider, then we need to
452 * trim it back so that the name look-up works properly.
453 * eg. /foo/new_dir/ -> /foo/newdir
454 * Curveball: Need to handle multiple path dividers:
455 * eg. /foof/sdfse///// -> /foo/sdfse
456 */
457 if (path_length > 0 && yaffsfs_IsPathDivider(path[path_length - 1])) {
458 alt_path = kmalloc(path_length + 1, 0);
459 if (!alt_path)
460 return -1;
461 yaffs_strcpy(alt_path, path);
462 for (i = path_length - 1;
463 i >= 0 && yaffsfs_IsPathDivider(alt_path[i]); i--)
464 alt_path[i] = (YCHAR) 0;
465 }
466 *ret_path = alt_path;
467 return 0;
468 }
469
470 LIST_HEAD(yaffsfs_deviceList);
471
472 /*
473 * yaffsfs_FindDevice
474 * yaffsfs_FindRoot
475 * Scan the configuration list to find the device
476 * Curveballs: Should match paths that end in '/' too
477 * Curveball2 Might have "/x/ and "/x/y". Need to return the longest match
478 */
479 static struct yaffs_dev *yaffsfs_FindDevice(const YCHAR *path,
480 YCHAR **restOfPath)
481 {
482 struct list_head *cfg;
483 const YCHAR *leftOver;
484 const YCHAR *p;
485 struct yaffs_dev *retval = NULL;
486 struct yaffs_dev *dev = NULL;
487 int thisMatchLength;
488 int longestMatch = -1;
489 int matching;
490
491 /*
492 * Check all configs, choose the one that:
493 * 1) Actually matches a prefix (ie /a amd /abc will not match
494 * 2) Matches the longest.
495 */
496 list_for_each(cfg, &yaffsfs_deviceList) {
497 dev = list_entry(cfg, struct yaffs_dev, dev_list);
498 leftOver = path;
499 p = dev->param.name;
500 thisMatchLength = 0;
501 matching = 1;
502
503 while (matching && *p && *leftOver) {
504 /* Skip over any /s */
505 while (yaffsfs_IsPathDivider(*p))
506 p++;
507
508 /* Skip over any /s */
509 while (yaffsfs_IsPathDivider(*leftOver))
510 leftOver++;
511
512 /* Now match the text part */
513 while (matching &&
514 *p && !yaffsfs_IsPathDivider(*p) &&
515 *leftOver && !yaffsfs_IsPathDivider(*leftOver)) {
516 if (yaffsfs_Match(*p, *leftOver)) {
517 p++;
518 leftOver++;
519 thisMatchLength++;
520 } else {
521 matching = 0;
522 }
523 }
524 }
525
526 /* Skip over any /s in leftOver */
527 while (yaffsfs_IsPathDivider(*leftOver))
528 leftOver++;
529
530 /*Skip over any /s in p */
531 while (yaffsfs_IsPathDivider(*p))
532 p++;
533
534 /* p should now be at the end of the string if fully matched */
535 if (*p)
536 matching = 0;
537
538 if (matching && (thisMatchLength > longestMatch)) {
539 /* Matched prefix */
540 *restOfPath = (YCHAR *) leftOver;
541 retval = dev;
542 longestMatch = thisMatchLength;
543 }
544
545 }
546 return retval;
547 }
548
549 static int yaffsfs_CheckPath(const YCHAR *path)
550 {
551 int n = 0;
552 int divs = 0;
553
554 while (*path && n < YAFFS_MAX_NAME_LENGTH && divs < 100) {
555 if (yaffsfs_IsPathDivider(*path)) {
556 n = 0;
557 divs++;
558 } else
559 n++;
560 path++;
561 }
562
563 return (*path) ? -1 : 0;
564 }
565
566 /* FindMountPoint only returns a dev entry if the path is a mount point */
567 static struct yaffs_dev *yaffsfs_FindMountPoint(const YCHAR *path)
568 {
569 struct yaffs_dev *dev;
570 YCHAR *restOfPath = NULL;
571
572 dev = yaffsfs_FindDevice(path, &restOfPath);
573 if (dev && restOfPath && *restOfPath)
574 dev = NULL;
575 return dev;
576 }
577
578 static struct yaffs_obj *yaffsfs_FindRoot(const YCHAR *path,
579 YCHAR **restOfPath)
580 {
581 struct yaffs_dev *dev;
582
583 dev = yaffsfs_FindDevice(path, restOfPath);
584 if (dev && dev->is_mounted)
585 return dev->root_dir;
586
587 return NULL;
588 }
589
590 static struct yaffs_obj *yaffsfs_FollowLink(struct yaffs_obj *obj,
591 int symDepth, int *loop)
592 {
593
594 if (obj)
595 obj = yaffs_get_equivalent_obj(obj);
596
597 while (obj && obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
598 YCHAR *alias = obj->variant.symlink_variant.alias;
599
600 if (yaffsfs_IsPathDivider(*alias))
601 /* Starts with a /, need to scan from root up */
602 obj = yaffsfs_FindObject(NULL, alias, symDepth++,
603 1, NULL, NULL, loop);
604 else
605 /*
606 * Relative to here so use the parent of the
607 * symlink as a start
608 */
609 obj = yaffsfs_FindObject(obj->parent, alias, symDepth++,
610 1, NULL, NULL, loop);
611 }
612 return obj;
613 }
614
615 /*
616 * yaffsfs_FindDirectory
617 * Parse a path to determine the directory and the name within the directory.
618 *
619 * eg. "/data/xx/ff" --> puts name="ff" and returns the directory "/data/xx"
620 */
621 static struct yaffs_obj *yaffsfs_DoFindDirectory(struct yaffs_obj *startDir,
622 const YCHAR *path,
623 YCHAR **name, int symDepth,
624 int *notDir, int *loop)
625 {
626 struct yaffs_obj *dir;
627 YCHAR *restOfPath;
628 YCHAR str[YAFFS_MAX_NAME_LENGTH + 1];
629 int i;
630
631 if (symDepth > YAFFSFS_MAX_SYMLINK_DEREFERENCES) {
632 if (loop)
633 *loop = 1;
634 return NULL;
635 }
636
637 if (startDir) {
638 dir = startDir;
639 restOfPath = (YCHAR *) path;
640 } else
641 dir = yaffsfs_FindRoot(path, &restOfPath);
642
643 while (dir) {
644 /*
645 * parse off /.
646 * curve ball: also throw away surplus '/'
647 * eg. "/ram/x////ff" gets treated the same as "/ram/x/ff"
648 */
649 while (yaffsfs_IsPathDivider(*restOfPath))
650 restOfPath++; /* get rid of '/' */
651
652 *name = restOfPath;
653 i = 0;
654
655 while (*restOfPath && !yaffsfs_IsPathDivider(*restOfPath)) {
656 if (i < YAFFS_MAX_NAME_LENGTH) {
657 str[i] = *restOfPath;
658 str[i + 1] = '\0';
659 i++;
660 }
661 restOfPath++;
662 }
663
664 if (!*restOfPath)
665 /* got to the end of the string */
666 return dir;
667 else {
668 if (yaffs_strcmp(str, _Y(".")) == 0) {
669 /* Do nothing */
670 } else if (yaffs_strcmp(str, _Y("..")) == 0) {
671 dir = dir->parent;
672 } else {
673 dir = yaffs_find_by_name(dir, str);
674
675 dir = yaffsfs_FollowLink(dir, symDepth, loop);
676
677 if (dir && dir->variant_type !=
678 YAFFS_OBJECT_TYPE_DIRECTORY) {
679 if (notDir)
680 *notDir = 1;
681 dir = NULL;
682 }
683
684 }
685 }
686 }
687 /* directory did not exist. */
688 return NULL;
689 }
690
691 static struct yaffs_obj *yaffsfs_FindDirectory(struct yaffs_obj *relDir,
692 const YCHAR *path,
693 YCHAR **name,
694 int symDepth,
695 int *notDir, int *loop)
696 {
697 return yaffsfs_DoFindDirectory(relDir, path, name, symDepth, notDir,
698 loop);
699 }
700
701 /*
702 * yaffsfs_FindObject turns a path for an existing object into the object
703 */
704 static struct yaffs_obj *yaffsfs_FindObject(struct yaffs_obj *relDir,
705 const YCHAR *path, int symDepth,
706 int getEquiv,
707 struct yaffs_obj **dirOut,
708 int *notDir, int *loop)
709 {
710 struct yaffs_obj *dir;
711 struct yaffs_obj *obj;
712 YCHAR *name;
713
714 dir =
715 yaffsfs_FindDirectory(relDir, path, &name, symDepth, notDir, loop);
716
717 if (dirOut)
718 *dirOut = dir;
719
720 if (dir && *name)
721 obj = yaffs_find_by_name(dir, name);
722 else
723 obj = dir;
724
725 if (getEquiv)
726 obj = yaffs_get_equivalent_obj(obj);
727
728 return obj;
729 }
730
731 /*************************************************************************
732 * Start of yaffsfs visible functions.
733 *************************************************************************/
734
735 int yaffs_dup(int handle)
736 {
737 int newHandleNumber = -1;
738 struct yaffsfs_FileDes *existingFD = NULL;
739 struct yaffsfs_Handle *existingHandle = NULL;
740 struct yaffsfs_Handle *newHandle = NULL;
741
742 yaffsfs_Lock();
743 existingHandle = yaffsfs_HandleToPointer(handle);
744 existingFD = yaffsfs_HandleToFileDes(handle);
745 if (existingFD)
746 newHandleNumber = yaffsfs_NewHandle(&newHandle);
747 if (newHandle) {
748 newHandle->fdId = existingHandle->fdId;
749 existingFD->handleCount++;
750 }
751
752 yaffsfs_Unlock();
753
754 if (!existingFD)
755 yaffsfs_SetError(-EBADF);
756 else if (!newHandle)
757 yaffsfs_SetError(-ENOMEM);
758
759 return newHandleNumber;
760
761 }
762
763 static int yaffsfs_TooManyObjects(struct yaffs_dev *dev)
764 {
765 int current_objects = dev->n_obj - dev->n_deleted_files;
766
767 if (dev->param.max_objects && current_objects > dev->param.max_objects)
768 return 1;
769 else
770 return 0;
771 }
772
773 int yaffs_open_sharing(const YCHAR *path, int oflag, int mode, int sharing)
774 {
775 struct yaffs_obj *obj = NULL;
776 struct yaffs_obj *dir = NULL;
777 YCHAR *name;
778 int handle = -1;
779 struct yaffsfs_FileDes *fd = NULL;
780 int openDenied = 0;
781 int symDepth = 0;
782 int errorReported = 0;
783 int rwflags = oflag & (O_RDWR | O_RDONLY | O_WRONLY);
784 u8 shareRead = (sharing & YAFFS_SHARE_READ) ? 1 : 0;
785 u8 shareWrite = (sharing & YAFFS_SHARE_WRITE) ? 1 : 0;
786 u8 sharedReadAllowed;
787 u8 sharedWriteAllowed;
788 u8 alreadyReading;
789 u8 alreadyWriting;
790 u8 readRequested;
791 u8 writeRequested;
792 int notDir = 0;
793 int loop = 0;
794
795 if (!path) {
796 yaffsfs_SetError(-EFAULT);
797 return -1;
798 }
799
800 if (yaffsfs_CheckPath(path) < 0) {
801 yaffsfs_SetError(-ENAMETOOLONG);
802 return -1;
803 }
804
805 /* O_EXCL only has meaning if O_CREAT is specified */
806 if (!(oflag & O_CREAT))
807 oflag &= ~(O_EXCL);
808
809 /* O_TRUNC has no meaning if (O_CREAT | O_EXCL) is specified */
810 if ((oflag & O_CREAT) & (oflag & O_EXCL))
811 oflag &= ~(O_TRUNC);
812
813 /* Todo: Are there any more flag combos to sanitise ? */
814
815 /* Figure out if reading or writing is requested */
816
817 readRequested = (rwflags == O_RDWR || rwflags == O_RDONLY) ? 1 : 0;
818 writeRequested = (rwflags == O_RDWR || rwflags == O_WRONLY) ? 1 : 0;
819
820 yaffsfs_Lock();
821
822 handle = yaffsfs_NewHandleAndFileDes();
823
824 if (handle < 0) {
825 yaffsfs_SetError(-ENFILE);
826 errorReported = 1;
827 } else {
828
829 fd = yaffsfs_HandleToFileDes(handle);
830
831 /* try to find the exisiting object */
832 obj = yaffsfs_FindObject(NULL, path, 0, 1, NULL, NULL, NULL);
833
834 obj = yaffsfs_FollowLink(obj, symDepth++, &loop);
835
836 if (obj &&
837 obj->variant_type != YAFFS_OBJECT_TYPE_FILE &&
838 obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
839 obj = NULL;
840
841 if (obj) {
842
843 /* The file already exists or it might be a directory */
844
845 /* A directory can't be opened as a file */
846 if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
847 openDenied = 1;
848 yaffsfs_SetError(-EISDIR);
849 errorReported = 1;
850 }
851
852 /* Open should fail if O_CREAT and O_EXCL are specified
853 * for a file that exists.
854 */
855 if (!errorReported &&
856 (oflag & O_EXCL) && (oflag & O_CREAT)) {
857 openDenied = 1;
858 yaffsfs_SetError(-EEXIST);
859 errorReported = 1;
860 }
861
862 /* Check file permissions */
863 if (readRequested && !(obj->yst_mode & S_IREAD))
864 openDenied = 1;
865
866 if (writeRequested && !(obj->yst_mode & S_IWRITE))
867 openDenied = 1;
868
869 if (!errorReported && writeRequested &&
870 obj->my_dev->read_only) {
871 openDenied = 1;
872 yaffsfs_SetError(-EROFS);
873 errorReported = 1;
874 }
875
876 if (openDenied && !errorReported) {
877 yaffsfs_SetError(-EACCES);
878 errorReported = 1;
879 }
880
881 /* Check sharing of an existing object. */
882 if (!openDenied) {
883 struct yaffsfs_FileDes *fdx;
884 int i;
885
886 sharedReadAllowed = 1;
887 sharedWriteAllowed = 1;
888 alreadyReading = 0;
889 alreadyWriting = 0;
890 for (i = 0; i < YAFFSFS_N_HANDLES; i++) {
891 fdx = &yaffsfs_fd[i];
892 if (fdx->handleCount > 0 &&
893 fdx->inodeId >= 0 &&
894 yaffsfs_inode[fdx->inodeId].iObj
895 == obj) {
896 if (!fdx->shareRead)
897 sharedReadAllowed = 0;
898 if (!fdx->shareWrite)
899 sharedWriteAllowed = 0;
900 if (fdx->reading)
901 alreadyReading = 1;
902 if (fdx->writing)
903 alreadyWriting = 1;
904 }
905 }
906
907 if ((!sharedReadAllowed && readRequested) ||
908 (!shareRead && alreadyReading) ||
909 (!sharedWriteAllowed && writeRequested) ||
910 (!shareWrite && alreadyWriting)) {
911 openDenied = 1;
912 yaffsfs_SetError(-EBUSY);
913 errorReported = 1;
914 }
915 }
916
917 }
918
919 /* If we could not open an existing object, then let's see if
920 * the directory exists. If not, error.
921 */
922 if (!obj && !errorReported) {
923 dir = yaffsfs_FindDirectory(NULL, path, &name, 0,
924 &notDir, &loop);
925 if (!dir && notDir) {
926 yaffsfs_SetError(-ENOTDIR);
927 errorReported = 1;
928 } else if (loop) {
929 yaffsfs_SetError(-ELOOP);
930 errorReported = 1;
931 } else if (!dir) {
932 yaffsfs_SetError(-ENOENT);
933 errorReported = 1;
934 }
935 }
936
937 if (!obj && dir && !errorReported && (oflag & O_CREAT)) {
938 /* Let's see if we can create this file */
939 if (dir->my_dev->read_only) {
940 yaffsfs_SetError(-EROFS);
941 errorReported = 1;
942 } else if (yaffsfs_TooManyObjects(dir->my_dev)) {
943 yaffsfs_SetError(-ENFILE);
944 errorReported = 1;
945 } else
946 obj = yaffs_create_file(dir, name, mode, 0, 0);
947
948 if (!obj && !errorReported) {
949 yaffsfs_SetError(-ENOSPC);
950 errorReported = 1;
951 }
952 }
953
954 if (!obj && dir && !errorReported && !(oflag & O_CREAT)) {
955 yaffsfs_SetError(-ENOENT);
956 errorReported = 1;
957 }
958
959 if (obj && !openDenied) {
960 int inodeId = yaffsfs_GetInodeIdForObject(obj);
961
962 if (inodeId < 0) {
963 /*
964 * Todo: Fix any problem if inodes run out,
965 * That can't happen if the number of inode
966 * items >= number of handles.
967 */
968 }
969
970 fd->inodeId = inodeId;
971 fd->reading = readRequested;
972 fd->writing = writeRequested;
973 fd->append = (oflag & O_APPEND) ? 1 : 0;
974 fd->position = 0;
975 fd->shareRead = shareRead;
976 fd->shareWrite = shareWrite;
977
978 /* Hook inode to object */
979 obj->my_inode = (void *)&yaffsfs_inode[inodeId];
980
981 if ((oflag & O_TRUNC) && fd->writing)
982 yaffs_resize_file(obj, 0);
983 } else {
984 yaffsfs_PutHandle(handle);
985 if (!errorReported)
986 yaffsfs_SetError(0); /* Problem */
987 handle = -1;
988 }
989 }
990
991 yaffsfs_Unlock();
992
993 return handle;
994 }
995
996 int yaffs_open(const YCHAR *path, int oflag, int mode)
997 {
998 return yaffs_open_sharing(path, oflag, mode,
999 YAFFS_SHARE_READ | YAFFS_SHARE_WRITE);
1000 }
1001
1002 int yaffs_Dofsync(int handle, int datasync)
1003 {
1004 int retVal = -1;
1005 struct yaffs_obj *obj;
1006
1007 yaffsfs_Lock();
1008
1009 obj = yaffsfs_HandleToObject(handle);
1010
1011 if (!obj)
1012 yaffsfs_SetError(-EBADF);
1013 else if (obj->my_dev->read_only)
1014 yaffsfs_SetError(-EROFS);
1015 else {
1016 yaffs_flush_file(obj, 1, datasync);
1017 retVal = 0;
1018 }
1019
1020 yaffsfs_Unlock();
1021
1022 return retVal;
1023 }
1024
1025 int yaffs_fsync(int handle)
1026 {
1027 return yaffs_Dofsync(handle, 0);
1028 }
1029
1030 int yaffs_flush(int handle)
1031 {
1032 return yaffs_fsync(handle);
1033 }
1034
1035 int yaffs_fdatasync(int handle)
1036 {
1037 return yaffs_Dofsync(handle, 1);
1038 }
1039
1040 int yaffs_close(int handle)
1041 {
1042 struct yaffsfs_Handle *h = NULL;
1043 struct yaffs_obj *obj = NULL;
1044 int retVal = -1;
1045
1046 yaffsfs_Lock();
1047
1048 h = yaffsfs_HandleToPointer(handle);
1049 obj = yaffsfs_HandleToObject(handle);
1050
1051 if (!h || !obj)
1052 yaffsfs_SetError(-EBADF);
1053 else {
1054 /* clean up */
1055 yaffs_flush_file(obj, 1, 0);
1056 yaffsfs_PutHandle(handle);
1057 retVal = 0;
1058 }
1059
1060 yaffsfs_Unlock();
1061
1062 return retVal;
1063 }
1064
1065 int yaffsfs_do_read(int handle, void *vbuf, unsigned int nbyte,
1066 int isPread, loff_t offset)
1067 {
1068 struct yaffsfs_FileDes *fd = NULL;
1069 struct yaffs_obj *obj = NULL;
1070 loff_t pos = 0;
1071 loff_t startPos = 0;
1072 loff_t endPos = 0;
1073 int nRead = 0;
1074 int nToRead = 0;
1075 int totalRead = 0;
1076 loff_t maxRead;
1077 u8 *buf = (u8 *) vbuf;
1078
1079 if (!vbuf) {
1080 yaffsfs_SetError(-EFAULT);
1081 return -1;
1082 }
1083
1084 yaffsfs_Lock();
1085 fd = yaffsfs_HandleToFileDes(handle);
1086 obj = yaffsfs_HandleToObject(handle);
1087
1088 if (!fd || !obj) {
1089 /* bad handle */
1090 yaffsfs_SetError(-EBADF);
1091 totalRead = -1;
1092 } else if (!fd->reading) {
1093 /* Not a reading handle */
1094 yaffsfs_SetError(-EINVAL);
1095 totalRead = -1;
1096 } else if (nbyte > YAFFS_MAX_FILE_SIZE) {
1097 yaffsfs_SetError(-EINVAL);
1098 totalRead = -1;
1099 } else {
1100 if (isPread)
1101 startPos = offset;
1102 else
1103 startPos = fd->position;
1104
1105 pos = startPos;
1106
1107 if (yaffs_get_obj_length(obj) > pos)
1108 maxRead = yaffs_get_obj_length(obj) - pos;
1109 else
1110 maxRead = 0;
1111
1112 if (nbyte > maxRead)
1113 nbyte = maxRead;
1114
1115 yaffsfs_GetHandle(handle);
1116
1117 endPos = pos + nbyte;
1118
1119 if (pos < 0 || pos > YAFFS_MAX_FILE_SIZE ||
1120 nbyte > YAFFS_MAX_FILE_SIZE ||
1121 endPos < 0 || endPos > YAFFS_MAX_FILE_SIZE) {
1122 totalRead = -1;
1123 nbyte = 0;
1124 }
1125
1126 while (nbyte > 0) {
1127 nToRead = YAFFSFS_RW_SIZE -
1128 (pos & (YAFFSFS_RW_SIZE - 1));
1129 if (nToRead > nbyte)
1130 nToRead = nbyte;
1131
1132 /* Tricky bit...
1133 * Need to reverify object in case the device was
1134 * unmounted in another thread.
1135 */
1136 obj = yaffsfs_HandleToObject(handle);
1137 if (!obj)
1138 nRead = 0;
1139 else
1140 nRead = yaffs_file_rd(obj, buf, pos, nToRead);
1141
1142 if (nRead > 0) {
1143 totalRead += nRead;
1144 pos += nRead;
1145 buf += nRead;
1146 }
1147
1148 if (nRead == nToRead)
1149 nbyte -= nRead;
1150 else
1151 nbyte = 0; /* no more to read */
1152
1153 if (nbyte > 0) {
1154 yaffsfs_Unlock();
1155 yaffsfs_Lock();
1156 }
1157
1158 }
1159
1160 yaffsfs_PutHandle(handle);
1161
1162 if (!isPread) {
1163 if (totalRead >= 0)
1164 fd->position = startPos + totalRead;
1165 else
1166 yaffsfs_SetError(-EINVAL);
1167 }
1168
1169 }
1170
1171 yaffsfs_Unlock();
1172
1173 return (totalRead >= 0) ? totalRead : -1;
1174
1175 }
1176
1177 int yaffs_read(int handle, void *buf, unsigned int nbyte)
1178 {
1179 return yaffsfs_do_read(handle, buf, nbyte, 0, 0);
1180 }
1181
1182 int yaffs_pread(int handle, void *buf, unsigned int nbyte, loff_t offset)
1183 {
1184 return yaffsfs_do_read(handle, buf, nbyte, 1, offset);
1185 }
1186
1187 int yaffsfs_do_write(int handle, const void *vbuf, unsigned int nbyte,
1188 int isPwrite, loff_t offset)
1189 {
1190 struct yaffsfs_FileDes *fd = NULL;
1191 struct yaffs_obj *obj = NULL;
1192 loff_t pos = 0;
1193 loff_t startPos = 0;
1194 loff_t endPos;
1195 int nWritten = 0;
1196 int totalWritten = 0;
1197 int write_trhrough = 0;
1198 int nToWrite = 0;
1199 const u8 *buf = (const u8 *)vbuf;
1200
1201 if (!vbuf) {
1202 yaffsfs_SetError(-EFAULT);
1203 return -1;
1204 }
1205
1206 yaffsfs_Lock();
1207 fd = yaffsfs_HandleToFileDes(handle);
1208 obj = yaffsfs_HandleToObject(handle);
1209
1210 if (!fd || !obj) {
1211 /* bad handle */
1212 yaffsfs_SetError(-EBADF);
1213 totalWritten = -1;
1214 } else if (!fd->writing) {
1215 yaffsfs_SetError(-EINVAL);
1216 totalWritten = -1;
1217 } else if (obj->my_dev->read_only) {
1218 yaffsfs_SetError(-EROFS);
1219 totalWritten = -1;
1220 } else {
1221 if (fd->append)
1222 startPos = yaffs_get_obj_length(obj);
1223 else if (isPwrite)
1224 startPos = offset;
1225 else
1226 startPos = fd->position;
1227
1228 yaffsfs_GetHandle(handle);
1229 pos = startPos;
1230 endPos = pos + nbyte;
1231
1232 if (pos < 0 || pos > YAFFS_MAX_FILE_SIZE ||
1233 nbyte > YAFFS_MAX_FILE_SIZE ||
1234 endPos < 0 || endPos > YAFFS_MAX_FILE_SIZE) {
1235 totalWritten = -1;
1236 nbyte = 0;
1237 }
1238
1239 while (nbyte > 0) {
1240
1241 nToWrite = YAFFSFS_RW_SIZE -
1242 (pos & (YAFFSFS_RW_SIZE - 1));
1243 if (nToWrite > nbyte)
1244 nToWrite = nbyte;
1245
1246 /* Tricky bit...
1247 * Need to reverify object in case the device was
1248 * remounted or unmounted in another thread.
1249 */
1250 obj = yaffsfs_HandleToObject(handle);
1251 if (!obj || obj->my_dev->read_only)
1252 nWritten = 0;
1253 else
1254 nWritten =
1255 yaffs_wr_file(obj, buf, pos, nToWrite,
1256 write_trhrough);
1257 if (nWritten > 0) {
1258 totalWritten += nWritten;
1259 pos += nWritten;
1260 buf += nWritten;
1261 }
1262
1263 if (nWritten == nToWrite)
1264 nbyte -= nToWrite;
1265 else
1266 nbyte = 0;
1267
1268 if (nWritten < 1 && totalWritten < 1) {
1269 yaffsfs_SetError(-ENOSPC);
1270 totalWritten = -1;
1271 }
1272
1273 if (nbyte > 0) {
1274 yaffsfs_Unlock();
1275 yaffsfs_Lock();
1276 }
1277 }
1278
1279 yaffsfs_PutHandle(handle);
1280
1281 if (!isPwrite) {
1282 if (totalWritten > 0)
1283 fd->position = startPos + totalWritten;
1284 else
1285 yaffsfs_SetError(-EINVAL);
1286 }
1287 }
1288
1289 yaffsfs_Unlock();
1290
1291 return (totalWritten >= 0) ? totalWritten : -1;
1292 }
1293
1294 int yaffs_write(int fd, const void *buf, unsigned int nbyte)
1295 {
1296 return yaffsfs_do_write(fd, buf, nbyte, 0, 0);
1297 }
1298
1299 int yaffs_pwrite(int fd, const void *buf, unsigned int nbyte, loff_t offset)
1300 {
1301 return yaffsfs_do_write(fd, buf, nbyte, 1, offset);
1302 }
1303
1304 int yaffs_truncate(const YCHAR *path, loff_t new_size)
1305 {
1306 struct yaffs_obj *obj = NULL;
1307 struct yaffs_obj *dir = NULL;
1308 int result = YAFFS_FAIL;
1309 int notDir = 0;
1310 int loop = 0;
1311
1312 if (!path) {
1313 yaffsfs_SetError(-EFAULT);
1314 return -1;
1315 }
1316
1317 if (yaffsfs_CheckPath(path) < 0) {
1318 yaffsfs_SetError(-ENAMETOOLONG);
1319 return -1;
1320 }
1321
1322 yaffsfs_Lock();
1323
1324 obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
1325 obj = yaffsfs_FollowLink(obj, 0, &loop);
1326
1327 if (!dir && notDir)
1328 yaffsfs_SetError(-ENOTDIR);
1329 else if (loop)
1330 yaffsfs_SetError(-ELOOP);
1331 else if (!dir || !obj)
1332 yaffsfs_SetError(-ENOENT);
1333 else if (obj->my_dev->read_only)
1334 yaffsfs_SetError(-EROFS);
1335 else if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
1336 yaffsfs_SetError(-EISDIR);
1337 else if (obj->my_dev->read_only)
1338 yaffsfs_SetError(-EROFS);
1339 else if (new_size < 0 || new_size > YAFFS_MAX_FILE_SIZE)
1340 yaffsfs_SetError(-EINVAL);
1341 else
1342 result = yaffs_resize_file(obj, new_size);
1343
1344 yaffsfs_Unlock();
1345
1346 return (result) ? 0 : -1;
1347 }
1348
1349 int yaffs_ftruncate(int handle, loff_t new_size)
1350 {
1351 struct yaffsfs_FileDes *fd = NULL;
1352 struct yaffs_obj *obj = NULL;
1353 int result = 0;
1354
1355 yaffsfs_Lock();
1356 fd = yaffsfs_HandleToFileDes(handle);
1357 obj = yaffsfs_HandleToObject(handle);
1358
1359 if (!fd || !obj)
1360 /* bad handle */
1361 yaffsfs_SetError(-EBADF);
1362 else if (!fd->writing)
1363 yaffsfs_SetError(-EINVAL);
1364 else if (obj->my_dev->read_only)
1365 yaffsfs_SetError(-EROFS);
1366 else if (new_size < 0 || new_size > YAFFS_MAX_FILE_SIZE)
1367 yaffsfs_SetError(-EINVAL);
1368 else
1369 /* resize the file */
1370 result = yaffs_resize_file(obj, new_size);
1371 yaffsfs_Unlock();
1372
1373 return (result) ? 0 : -1;
1374
1375 }
1376
1377 loff_t yaffs_lseek(int handle, loff_t offset, int whence)
1378 {
1379 struct yaffsfs_FileDes *fd = NULL;
1380 struct yaffs_obj *obj = NULL;
1381 loff_t pos = -1;
1382 loff_t fSize = -1;
1383
1384 yaffsfs_Lock();
1385 fd = yaffsfs_HandleToFileDes(handle);
1386 obj = yaffsfs_HandleToObject(handle);
1387
1388 if (!fd || !obj)
1389 yaffsfs_SetError(-EBADF);
1390 else if (offset > YAFFS_MAX_FILE_SIZE)
1391 yaffsfs_SetError(-EINVAL);
1392 else {
1393 if (whence == SEEK_SET) {
1394 if (offset >= 0)
1395 pos = offset;
1396 } else if (whence == SEEK_CUR) {
1397 if ((fd->position + offset) >= 0)
1398 pos = (fd->position + offset);
1399 } else if (whence == SEEK_END) {
1400 fSize = yaffs_get_obj_length(obj);
1401 if (fSize >= 0 && (fSize + offset) >= 0)
1402 pos = fSize + offset;
1403 }
1404
1405 if (pos >= 0 && pos <= YAFFS_MAX_FILE_SIZE)
1406 fd->position = pos;
1407 else {
1408 yaffsfs_SetError(-EINVAL);
1409 pos = -1;
1410 }
1411 }
1412
1413 yaffsfs_Unlock();
1414
1415 return pos;
1416 }
1417
1418 int yaffsfs_DoUnlink(const YCHAR *path, int isDirectory)
1419 {
1420 struct yaffs_obj *dir = NULL;
1421 struct yaffs_obj *obj = NULL;
1422 YCHAR *name;
1423 int result = YAFFS_FAIL;
1424 int notDir = 0;
1425 int loop = 0;
1426
1427 if (!path) {
1428 yaffsfs_SetError(-EFAULT);
1429 return -1;
1430 }
1431
1432 if (yaffsfs_CheckPath(path) < 0) {
1433 yaffsfs_SetError(-ENAMETOOLONG);
1434 return -1;
1435 }
1436
1437 yaffsfs_Lock();
1438
1439 obj = yaffsfs_FindObject(NULL, path, 0, 0, NULL, NULL, NULL);
1440 dir = yaffsfs_FindDirectory(NULL, path, &name, 0, &notDir, &loop);
1441
1442 if (!dir && notDir)
1443 yaffsfs_SetError(-ENOTDIR);
1444 else if (loop)
1445 yaffsfs_SetError(-ELOOP);
1446 else if (!dir)
1447 yaffsfs_SetError(-ENOENT);
1448 else if (yaffs_strncmp(name, _Y("."), 2) == 0)
1449 yaffsfs_SetError(-EINVAL);
1450 else if (!obj)
1451 yaffsfs_SetError(-ENOENT);
1452 else if (obj->my_dev->read_only)
1453 yaffsfs_SetError(-EROFS);
1454 else if (!isDirectory &&
1455 obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
1456 yaffsfs_SetError(-EISDIR);
1457 else if (isDirectory &&
1458 obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
1459 yaffsfs_SetError(-ENOTDIR);
1460 else if (isDirectory && obj == obj->my_dev->root_dir)
1461 yaffsfs_SetError(-EBUSY); /* Can't rmdir a root */
1462 else {
1463 result = yaffs_unlinker(dir, name);
1464
1465 if (result == YAFFS_FAIL && isDirectory)
1466 yaffsfs_SetError(-ENOTEMPTY);
1467 }
1468
1469 yaffsfs_Unlock();
1470
1471 return (result == YAFFS_FAIL) ? -1 : 0;
1472 }
1473
1474 int yaffs_unlink(const YCHAR *path)
1475 {
1476 return yaffsfs_DoUnlink(path, 0);
1477 }
1478
1479 int yaffs_rename(const YCHAR *oldPath, const YCHAR *newPath)
1480 {
1481 struct yaffs_obj *olddir = NULL;
1482 struct yaffs_obj *newdir = NULL;
1483 struct yaffs_obj *obj = NULL;
1484 struct yaffs_obj *newobj = NULL;
1485 YCHAR *oldname;
1486 YCHAR *newname;
1487 int result = YAFFS_FAIL;
1488 int rename_allowed = 1;
1489 int notOldDir = 0;
1490 int notNewDir = 0;
1491 int oldLoop = 0;
1492 int newLoop = 0;
1493
1494 YCHAR *alt_newpath = NULL;
1495
1496 if (!oldPath || !newPath) {
1497 yaffsfs_SetError(-EFAULT);
1498 return -1;
1499 }
1500
1501 if (yaffsfs_CheckPath(oldPath) < 0 || yaffsfs_CheckPath(newPath) < 0) {
1502 yaffsfs_SetError(-ENAMETOOLONG);
1503 return -1;
1504 }
1505
1506 if (yaffsfs_alt_dir_path(newPath, &alt_newpath) < 0) {
1507 yaffsfs_SetError(-ENOMEM);
1508 return -1;
1509 }
1510 if (alt_newpath)
1511 newPath = alt_newpath;
1512
1513 yaffsfs_Lock();
1514
1515 olddir = yaffsfs_FindDirectory(NULL, oldPath, &oldname, 0,
1516 &notOldDir, &oldLoop);
1517 newdir = yaffsfs_FindDirectory(NULL, newPath, &newname, 0,
1518 &notNewDir, &newLoop);
1519 obj = yaffsfs_FindObject(NULL, oldPath, 0, 0, NULL, NULL, NULL);
1520 newobj = yaffsfs_FindObject(NULL, newPath, 0, 0, NULL, NULL, NULL);
1521
1522 /* If the object being renamed is a directory and the
1523 * path ended with a "/" then the olddir == obj.
1524 * We pass through NULL for the old name to tell the lower layers
1525 * to use olddir as the object.
1526 */
1527
1528 if (olddir == obj)
1529 oldname = NULL;
1530
1531 if ((!olddir && notOldDir) || (!newdir && notNewDir)) {
1532 yaffsfs_SetError(-ENOTDIR);
1533 rename_allowed = 0;
1534 } else if (oldLoop || newLoop) {
1535 yaffsfs_SetError(-ELOOP);
1536 rename_allowed = 0;
1537 } else if (olddir && oldname &&
1538 yaffs_strncmp(oldname, _Y("."), 2) == 0) {
1539 yaffsfs_SetError(-EINVAL);
1540 rename_allowed = 0;
1541 } else if (!olddir || !newdir || !obj) {
1542 yaffsfs_SetError(-ENOENT);
1543 rename_allowed = 0;
1544 } else if (obj->my_dev->read_only) {
1545 yaffsfs_SetError(-EROFS);
1546 rename_allowed = 0;
1547 } else if (yaffs_is_non_empty_dir(newobj)) {
1548 yaffsfs_SetError(-ENOTEMPTY);
1549 rename_allowed = 0;
1550 } else if (olddir->my_dev != newdir->my_dev) {
1551 /* Rename must be on same device */
1552 yaffsfs_SetError(-EXDEV);
1553 rename_allowed = 0;
1554 } else if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
1555 /*
1556 * It is a directory, check that it is not being renamed to
1557 * being its own decendent.
1558 * Do this by tracing from the new directory back to the root,
1559 * checking for obj
1560 */
1561
1562 struct yaffs_obj *xx = newdir;
1563
1564 while (rename_allowed && xx) {
1565 if (xx == obj)
1566 rename_allowed = 0;
1567 xx = xx->parent;
1568 }
1569 if (!rename_allowed)
1570 yaffsfs_SetError(-EINVAL);
1571 }
1572
1573 if (rename_allowed)
1574 result = yaffs_rename_obj(olddir, oldname, newdir, newname);
1575
1576 yaffsfs_Unlock();
1577
1578 kfree(alt_newpath);
1579
1580 return (result == YAFFS_FAIL) ? -1 : 0;
1581 }
1582
1583 static int yaffsfs_DoStat(struct yaffs_obj *obj, struct yaffs_stat *buf)
1584 {
1585 int retVal = -1;
1586
1587 obj = yaffs_get_equivalent_obj(obj);
1588
1589 if (obj && buf) {
1590 buf->st_dev = (int)obj->my_dev->os_context;
1591 buf->st_ino = obj->obj_id;
1592 buf->st_mode = obj->yst_mode & ~S_IFMT;
1593
1594 if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
1595 buf->st_mode |= S_IFDIR;
1596 else if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
1597 buf->st_mode |= S_IFLNK;
1598 else if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
1599 buf->st_mode |= S_IFREG;
1600
1601 buf->st_nlink = yaffs_get_obj_link_count(obj);
1602 buf->st_uid = 0;
1603 buf->st_gid = 0;
1604 buf->st_rdev = obj->yst_rdev;
1605 buf->st_size = yaffs_get_obj_length(obj);
1606 buf->st_blksize = obj->my_dev->data_bytes_per_chunk;
1607 buf->st_blocks = lldiv(buf->st_size + buf->st_blksize - 1,
1608 buf->st_blksize);
1609 #if CONFIG_YAFFS_WINCE
1610 buf->yst_wince_atime[0] = obj->win_atime[0];
1611 buf->yst_wince_atime[1] = obj->win_atime[1];
1612 buf->yst_wince_ctime[0] = obj->win_ctime[0];
1613 buf->yst_wince_ctime[1] = obj->win_ctime[1];
1614 buf->yst_wince_mtime[0] = obj->win_mtime[0];
1615 buf->yst_wince_mtime[1] = obj->win_mtime[1];
1616 #else
1617 buf->yst_atime = obj->yst_atime;
1618 buf->yst_ctime = obj->yst_ctime;
1619 buf->yst_mtime = obj->yst_mtime;
1620 #endif
1621 retVal = 0;
1622 }
1623 return retVal;
1624 }
1625
1626 static int yaffsfs_DoStatOrLStat(const YCHAR *path,
1627 struct yaffs_stat *buf, int doLStat)
1628 {
1629 struct yaffs_obj *obj = NULL;
1630 struct yaffs_obj *dir = NULL;
1631 int retVal = -1;
1632 int notDir = 0;
1633 int loop = 0;
1634
1635 if (!path || !buf) {
1636 yaffsfs_SetError(-EFAULT);
1637 return -1;
1638 }
1639
1640 if (yaffsfs_CheckPath(path) < 0) {
1641 yaffsfs_SetError(-ENAMETOOLONG);
1642 return -1;
1643 }
1644
1645 yaffsfs_Lock();
1646
1647 obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
1648
1649 if (!doLStat && obj)
1650 obj = yaffsfs_FollowLink(obj, 0, &loop);
1651
1652 if (!dir && notDir)
1653 yaffsfs_SetError(-ENOTDIR);
1654 else if (loop)
1655 yaffsfs_SetError(-ELOOP);
1656 else if (!dir || !obj)
1657 yaffsfs_SetError(-ENOENT);
1658 else
1659 retVal = yaffsfs_DoStat(obj, buf);
1660
1661 yaffsfs_Unlock();
1662
1663 return retVal;
1664
1665 }
1666
1667 int yaffs_stat(const YCHAR *path, struct yaffs_stat *buf)
1668 {
1669 return yaffsfs_DoStatOrLStat(path, buf, 0);
1670 }
1671
1672 int yaffs_lstat(const YCHAR *path, struct yaffs_stat *buf)
1673 {
1674 return yaffsfs_DoStatOrLStat(path, buf, 1);
1675 }
1676
1677 int yaffs_fstat(int fd, struct yaffs_stat *buf)
1678 {
1679 struct yaffs_obj *obj;
1680
1681 int retVal = -1;
1682
1683 if (!buf) {
1684 yaffsfs_SetError(-EFAULT);
1685 return -1;
1686 }
1687
1688 yaffsfs_Lock();
1689 obj = yaffsfs_HandleToObject(fd);
1690
1691 if (obj)
1692 retVal = yaffsfs_DoStat(obj, buf);
1693 else
1694 /* bad handle */
1695 yaffsfs_SetError(-EBADF);
1696
1697 yaffsfs_Unlock();
1698
1699 return retVal;
1700 }
1701
1702 static int yaffsfs_DoUtime(struct yaffs_obj *obj,
1703 const struct yaffs_utimbuf *buf)
1704 {
1705 int retVal = -1;
1706 int result;
1707
1708 struct yaffs_utimbuf local;
1709
1710 obj = yaffs_get_equivalent_obj(obj);
1711
1712 if (obj && obj->my_dev->read_only) {
1713 yaffsfs_SetError(-EROFS);
1714 return -1;
1715 }
1716
1717 if (!buf) {
1718 local.actime = Y_CURRENT_TIME;
1719 local.modtime = local.actime;
1720 buf = &local;
1721 }
1722
1723 if (obj) {
1724 obj->yst_atime = buf->actime;
1725 obj->yst_mtime = buf->modtime;
1726 obj->dirty = 1;
1727 result = yaffs_flush_file(obj, 0, 0);
1728 retVal = result == YAFFS_OK ? 0 : -1;
1729 }
1730
1731 return retVal;
1732 }
1733
1734 int yaffs_utime(const YCHAR *path, const struct yaffs_utimbuf *buf)
1735 {
1736 struct yaffs_obj *obj = NULL;
1737 struct yaffs_obj *dir = NULL;
1738 int retVal = -1;
1739 int notDir = 0;
1740 int loop = 0;
1741
1742 if (!path) {
1743 yaffsfs_SetError(-EFAULT);
1744 return -1;
1745 }
1746
1747 if (yaffsfs_CheckPath(path) < 0) {
1748 yaffsfs_SetError(-ENAMETOOLONG);
1749 return -1;
1750 }
1751
1752 yaffsfs_Lock();
1753
1754 obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
1755
1756 if (!dir && notDir)
1757 yaffsfs_SetError(-ENOTDIR);
1758 else if (loop)
1759 yaffsfs_SetError(-ELOOP);
1760 else if (!dir || !obj)
1761 yaffsfs_SetError(-ENOENT);
1762 else
1763 retVal = yaffsfs_DoUtime(obj, buf);
1764
1765 yaffsfs_Unlock();
1766
1767 return retVal;
1768
1769 }
1770
1771 int yaffs_futime(int fd, const struct yaffs_utimbuf *buf)
1772 {
1773 struct yaffs_obj *obj;
1774
1775 int retVal = -1;
1776
1777 yaffsfs_Lock();
1778 obj = yaffsfs_HandleToObject(fd);
1779
1780 if (obj)
1781 retVal = yaffsfs_DoUtime(obj, buf);
1782 else
1783 /* bad handle */
1784 yaffsfs_SetError(-EBADF);
1785
1786 yaffsfs_Unlock();
1787
1788 return retVal;
1789 }
1790
1791 #ifndef CONFIG_YAFFS_WINCE
1792 /* xattrib functions */
1793
1794 static int yaffs_do_setxattr(const YCHAR *path, const char *name,
1795 const void *data, int size, int flags, int follow)
1796 {
1797 struct yaffs_obj *obj;
1798 struct yaffs_obj *dir;
1799 int notDir = 0;
1800 int loop = 0;
1801
1802 int retVal = -1;
1803
1804 if (!path || !name || !data) {
1805 yaffsfs_SetError(-EFAULT);
1806 return -1;
1807 }
1808
1809 if (yaffsfs_CheckPath(path) < 0) {
1810 yaffsfs_SetError(-ENAMETOOLONG);
1811 return -1;
1812 }
1813
1814 yaffsfs_Lock();
1815
1816 obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
1817
1818 if (follow)
1819 obj = yaffsfs_FollowLink(obj, 0, &loop);
1820
1821 if (!dir && notDir)
1822 yaffsfs_SetError(-ENOTDIR);
1823 else if (loop)
1824 yaffsfs_SetError(-ELOOP);
1825 else if (!dir || !obj)
1826 yaffsfs_SetError(-ENOENT);
1827 else {
1828 retVal = yaffs_set_xattrib(obj, name, data, size, flags);
1829 if (retVal < 0) {
1830 yaffsfs_SetError(retVal);
1831 retVal = -1;
1832 }
1833 }
1834
1835 yaffsfs_Unlock();
1836
1837 return retVal;
1838
1839 }
1840
1841 int yaffs_setxattr(const YCHAR *path, const char *name,
1842 const void *data, int size, int flags)
1843 {
1844 return yaffs_do_setxattr(path, name, data, size, flags, 1);
1845 }
1846
1847 int yaffs_lsetxattr(const YCHAR *path, const char *name,
1848 const void *data, int size, int flags)
1849 {
1850 return yaffs_do_setxattr(path, name, data, size, flags, 0);
1851 }
1852
1853 int yaffs_fsetxattr(int fd, const char *name,
1854 const void *data, int size, int flags)
1855 {
1856 struct yaffs_obj *obj;
1857
1858 int retVal = -1;
1859
1860 if (!name || !data) {
1861 yaffsfs_SetError(-EFAULT);
1862 return -1;
1863 }
1864
1865 yaffsfs_Lock();
1866 obj = yaffsfs_HandleToObject(fd);
1867
1868 if (!obj)
1869 yaffsfs_SetError(-EBADF);
1870 else {
1871 retVal = yaffs_set_xattrib(obj, name, data, size, flags);
1872 if (retVal < 0) {
1873 yaffsfs_SetError(retVal);
1874 retVal = -1;
1875 }
1876 }
1877
1878 yaffsfs_Unlock();
1879
1880 return retVal;
1881 }
1882
1883 static int yaffs_do_getxattr(const YCHAR *path, const char *name,
1884 void *data, int size, int follow)
1885 {
1886 struct yaffs_obj *obj;
1887 struct yaffs_obj *dir;
1888 int retVal = -1;
1889 int notDir = 0;
1890 int loop = 0;
1891
1892 if (!path || !name || !data) {
1893 yaffsfs_SetError(-EFAULT);
1894 return -1;
1895 }
1896
1897 if (yaffsfs_CheckPath(path) < 0) {
1898 yaffsfs_SetError(-ENAMETOOLONG);
1899 return -1;
1900 }
1901
1902 yaffsfs_Lock();
1903
1904 obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
1905
1906 if (follow)
1907 obj = yaffsfs_FollowLink(obj, 0, &loop);
1908
1909 if (!dir && notDir)
1910 yaffsfs_SetError(-ENOTDIR);
1911 else if (loop)
1912 yaffsfs_SetError(-ELOOP);
1913 else if (!dir || !obj)
1914 yaffsfs_SetError(-ENOENT);
1915 else {
1916 retVal = yaffs_get_xattrib(obj, name, data, size);
1917 if (retVal < 0) {
1918 yaffsfs_SetError(retVal);
1919 retVal = -1;
1920 }
1921 }
1922 yaffsfs_Unlock();
1923
1924 return retVal;
1925
1926 }
1927
1928 int yaffs_getxattr(const YCHAR *path, const char *name, void *data, int size)
1929 {
1930 return yaffs_do_getxattr(path, name, data, size, 1);
1931 }
1932
1933 int yaffs_lgetxattr(const YCHAR *path, const char *name, void *data, int size)
1934 {
1935 return yaffs_do_getxattr(path, name, data, size, 0);
1936 }
1937
1938 int yaffs_fgetxattr(int fd, const char *name, void *data, int size)
1939 {
1940 struct yaffs_obj *obj;
1941
1942 int retVal = -1;
1943
1944 if (!name || !data) {
1945 yaffsfs_SetError(-EFAULT);
1946 return -1;
1947 }
1948
1949 yaffsfs_Lock();
1950 obj = yaffsfs_HandleToObject(fd);
1951
1952 if (obj) {
1953 retVal = yaffs_get_xattrib(obj, name, data, size);
1954 if (retVal < 0) {
1955 yaffsfs_SetError(retVal);
1956 retVal = -1;
1957 }
1958 } else
1959 /* bad handle */
1960 yaffsfs_SetError(-EBADF);
1961
1962 yaffsfs_Unlock();
1963
1964 return retVal;
1965 }
1966
1967 static int yaffs_do_listxattr(const YCHAR *path, char *data,
1968 int size, int follow)
1969 {
1970 struct yaffs_obj *obj = NULL;
1971 struct yaffs_obj *dir = NULL;
1972 int retVal = -1;
1973 int notDir = 0;
1974 int loop = 0;
1975
1976 if (!path || !data) {
1977 yaffsfs_SetError(-EFAULT);
1978 return -1;
1979 }
1980
1981 if (yaffsfs_CheckPath(path) < 0) {
1982 yaffsfs_SetError(-ENAMETOOLONG);
1983 return -1;
1984 }
1985
1986 yaffsfs_Lock();
1987
1988 obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
1989
1990 if (follow)
1991 obj = yaffsfs_FollowLink(obj, 0, &loop);
1992
1993 if (!dir && notDir)
1994 yaffsfs_SetError(-ENOTDIR);
1995 else if (loop)
1996 yaffsfs_SetError(-ELOOP);
1997 else if (!dir || !obj)
1998 yaffsfs_SetError(-ENOENT);
1999 else {
2000 retVal = yaffs_list_xattrib(obj, data, size);
2001 if (retVal < 0) {
2002 yaffsfs_SetError(retVal);
2003 retVal = -1;
2004 }
2005 }
2006
2007 yaffsfs_Unlock();
2008
2009 return retVal;
2010
2011 }
2012
2013 int yaffs_listxattr(const YCHAR *path, char *data, int size)
2014 {
2015 return yaffs_do_listxattr(path, data, size, 1);
2016 }
2017
2018 int yaffs_llistxattr(const YCHAR *path, char *data, int size)
2019 {
2020 return yaffs_do_listxattr(path, data, size, 0);
2021 }
2022
2023 int yaffs_flistxattr(int fd, char *data, int size)
2024 {
2025 struct yaffs_obj *obj;
2026
2027 int retVal = -1;
2028
2029 if (!data) {
2030 yaffsfs_SetError(-EFAULT);
2031 return -1;
2032 }
2033
2034 yaffsfs_Lock();
2035 obj = yaffsfs_HandleToObject(fd);
2036
2037 if (obj) {
2038 retVal = yaffs_list_xattrib(obj, data, size);
2039 if (retVal < 0) {
2040 yaffsfs_SetError(retVal);
2041 retVal = -1;
2042 }
2043 } else
2044 /* bad handle */
2045 yaffsfs_SetError(-EBADF);
2046
2047 yaffsfs_Unlock();
2048
2049 return retVal;
2050 }
2051
2052 static int yaffs_do_removexattr(const YCHAR *path, const char *name,
2053 int follow)
2054 {
2055 struct yaffs_obj *obj = NULL;
2056 struct yaffs_obj *dir = NULL;
2057 int notDir = 0;
2058 int loop = 0;
2059 int retVal = -1;
2060
2061 if (!path || !name) {
2062 yaffsfs_SetError(-EFAULT);
2063 return -1;
2064 }
2065
2066 if (yaffsfs_CheckPath(path) < 0) {
2067 yaffsfs_SetError(-ENAMETOOLONG);
2068 return -1;
2069 }
2070
2071 yaffsfs_Lock();
2072
2073 obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
2074
2075 if (follow)
2076 obj = yaffsfs_FollowLink(obj, 0, &loop);
2077
2078 if (!dir && notDir)
2079 yaffsfs_SetError(-ENOTDIR);
2080 else if (loop)
2081 yaffsfs_SetError(-ELOOP);
2082 else if (!dir || !obj)
2083 yaffsfs_SetError(-ENOENT);
2084 else {
2085 retVal = yaffs_remove_xattrib(obj, name);
2086 if (retVal < 0) {
2087 yaffsfs_SetError(retVal);
2088 retVal = -1;
2089 }
2090 }
2091
2092 yaffsfs_Unlock();
2093
2094 return retVal;
2095
2096 }
2097
2098 int yaffs_removexattr(const YCHAR *path, const char *name)
2099 {
2100 return yaffs_do_removexattr(path, name, 1);
2101 }
2102
2103 int yaffs_lremovexattr(const YCHAR *path, const char *name)
2104 {
2105 return yaffs_do_removexattr(path, name, 0);
2106 }
2107
2108 int yaffs_fremovexattr(int fd, const char *name)
2109 {
2110 struct yaffs_obj *obj;
2111
2112 int retVal = -1;
2113
2114 if (!name) {
2115 yaffsfs_SetError(-EFAULT);
2116 return -1;
2117 }
2118
2119 yaffsfs_Lock();
2120 obj = yaffsfs_HandleToObject(fd);
2121
2122 if (obj) {
2123 retVal = yaffs_remove_xattrib(obj, name);
2124 if (retVal < 0) {
2125 yaffsfs_SetError(retVal);
2126 retVal = -1;
2127 }
2128 } else
2129 /* bad handle */
2130 yaffsfs_SetError(-EBADF);
2131
2132 yaffsfs_Unlock();
2133
2134 return retVal;
2135 }
2136 #endif
2137
2138 #ifdef CONFIG_YAFFS_WINCE
2139 int yaffs_get_wince_times(int fd, unsigned *wctime,
2140 unsigned *watime, unsigned *wmtime)
2141 {
2142 struct yaffs_obj *obj;
2143
2144 int retVal = -1;
2145
2146 yaffsfs_Lock();
2147 obj = yaffsfs_HandleToObject(fd);
2148
2149 if (obj) {
2150
2151 if (wctime) {
2152 wctime[0] = obj->win_ctime[0];
2153 wctime[1] = obj->win_ctime[1];
2154 }
2155 if (watime) {
2156 watime[0] = obj->win_atime[0];
2157 watime[1] = obj->win_atime[1];
2158 }
2159 if (wmtime) {
2160 wmtime[0] = obj->win_mtime[0];
2161 wmtime[1] = obj->win_mtime[1];
2162 }
2163
2164 retVal = 0;
2165 } else
2166 /* bad handle */
2167 yaffsfs_SetError(-EBADF);
2168
2169 yaffsfs_Unlock();
2170
2171 return retVal;
2172 }
2173
2174 int yaffs_set_wince_times(int fd,
2175 const unsigned *wctime,
2176 const unsigned *watime, const unsigned *wmtime)
2177 {
2178 struct yaffs_obj *obj;
2179 int result;
2180 int retVal = -1;
2181
2182 yaffsfs_Lock();
2183 obj = yaffsfs_HandleToObject(fd);
2184
2185 if (obj) {
2186
2187 if (wctime) {
2188 obj->win_ctime[0] = wctime[0];
2189 obj->win_ctime[1] = wctime[1];
2190 }
2191 if (watime) {
2192 obj->win_atime[0] = watime[0];
2193 obj->win_atime[1] = watime[1];
2194 }
2195 if (wmtime) {
2196 obj->win_mtime[0] = wmtime[0];
2197 obj->win_mtime[1] = wmtime[1];
2198 }
2199
2200 obj->dirty = 1;
2201 result = yaffs_flush_file(obj, 0, 0);
2202 retVal = 0;
2203 } else
2204 /* bad handle */
2205 yaffsfs_SetError(-EBADF);
2206
2207 yaffsfs_Unlock();
2208
2209 return retVal;
2210 }
2211
2212 #endif
2213
2214 static int yaffsfs_DoChMod(struct yaffs_obj *obj, mode_t mode)
2215 {
2216 int result = -1;
2217
2218 if (obj)
2219 obj = yaffs_get_equivalent_obj(obj);
2220
2221 if (obj) {
2222 obj->yst_mode = mode;
2223 obj->dirty = 1;
2224 result = yaffs_flush_file(obj, 0, 0);
2225 }
2226
2227 return result == YAFFS_OK ? 0 : -1;
2228 }
2229
2230 int yaffs_access(const YCHAR *path, int amode)
2231 {
2232 struct yaffs_obj *obj = NULL;
2233 struct yaffs_obj *dir = NULL;
2234 int notDir = 0;
2235 int loop = 0;
2236 int retval = -1;
2237
2238 if (!path) {
2239 yaffsfs_SetError(-EFAULT);
2240 return -1;
2241 }
2242
2243 if (yaffsfs_CheckPath(path) < 0) {
2244 yaffsfs_SetError(-ENAMETOOLONG);
2245 return -1;
2246 }
2247
2248 if (amode & ~(R_OK | W_OK | X_OK)) {
2249 yaffsfs_SetError(-EINVAL);
2250 return -1;
2251 }
2252
2253 yaffsfs_Lock();
2254
2255 obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
2256 obj = yaffsfs_FollowLink(obj, 0, &loop);
2257
2258 if (!dir && notDir)
2259 yaffsfs_SetError(-ENOTDIR);
2260 else if (loop)
2261 yaffsfs_SetError(-ELOOP);
2262 else if (!dir || !obj)
2263 yaffsfs_SetError(-ENOENT);
2264 else if ((amode & W_OK) && obj->my_dev->read_only)
2265 yaffsfs_SetError(-EROFS);
2266 else {
2267 int access_ok = 1;
2268
2269 if ((amode & R_OK) && !(obj->yst_mode & S_IREAD))
2270 access_ok = 0;
2271 if ((amode & W_OK) && !(obj->yst_mode & S_IWRITE))
2272 access_ok = 0;
2273 if ((amode & X_OK) && !(obj->yst_mode & S_IEXEC))
2274 access_ok = 0;
2275
2276 if (!access_ok)
2277 yaffsfs_SetError(-EACCES);
2278 else
2279 retval = 0;
2280 }
2281
2282 yaffsfs_Unlock();
2283
2284 return retval;
2285
2286 }
2287
2288 int yaffs_chmod(const YCHAR *path, mode_t mode)
2289 {
2290 struct yaffs_obj *obj = NULL;
2291 struct yaffs_obj *dir = NULL;
2292 int retVal = -1;
2293 int notDir = 0;
2294 int loop = 0;
2295
2296 if (!path) {
2297 yaffsfs_SetError(-EFAULT);
2298 return -1;
2299 }
2300
2301 if (yaffsfs_CheckPath(path) < 0) {
2302 yaffsfs_SetError(-ENAMETOOLONG);
2303 return -1;
2304 }
2305
2306 if (mode & ~(0777)) {
2307 yaffsfs_SetError(-EINVAL);
2308 return -1;
2309 }
2310
2311 yaffsfs_Lock();
2312
2313 obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
2314 obj = yaffsfs_FollowLink(obj, 0, &loop);
2315
2316 if (!dir && notDir)
2317 yaffsfs_SetError(-ENOTDIR);
2318 else if (loop)
2319 yaffsfs_SetError(-ELOOP);
2320 else if (!dir || !obj)
2321 yaffsfs_SetError(-ENOENT);
2322 else if (obj->my_dev->read_only)
2323 yaffsfs_SetError(-EROFS);
2324 else
2325 retVal = yaffsfs_DoChMod(obj, mode);
2326
2327 yaffsfs_Unlock();
2328
2329 return retVal;
2330
2331 }
2332
2333 int yaffs_fchmod(int fd, mode_t mode)
2334 {
2335 struct yaffs_obj *obj;
2336 int retVal = -1;
2337
2338 if (mode & ~(0777)) {
2339 yaffsfs_SetError(-EINVAL);
2340 return -1;
2341 }
2342
2343 yaffsfs_Lock();
2344 obj = yaffsfs_HandleToObject(fd);
2345
2346 if (!obj)
2347 yaffsfs_SetError(-EBADF);
2348 else if (obj->my_dev->read_only)
2349 yaffsfs_SetError(-EROFS);
2350 else
2351 retVal = yaffsfs_DoChMod(obj, mode);
2352
2353 yaffsfs_Unlock();
2354
2355 return retVal;
2356 }
2357
2358 int yaffs_mkdir(const YCHAR *path, mode_t mode)
2359 {
2360 struct yaffs_obj *parent = NULL;
2361 struct yaffs_obj *dir = NULL;
2362 YCHAR *name;
2363 YCHAR *alt_path = NULL;
2364 int retVal = -1;
2365 int notDir = 0;
2366 int loop = 0;
2367
2368 if (!path) {
2369 yaffsfs_SetError(-EFAULT);
2370 return -1;
2371 }
2372
2373 if (yaffsfs_CheckPath(path) < 0) {
2374 yaffsfs_SetError(-ENAMETOOLONG);
2375 return -1;
2376 }
2377
2378 if (yaffsfs_alt_dir_path(path, &alt_path) < 0) {
2379 yaffsfs_SetError(-ENOMEM);
2380 return -1;
2381 }
2382 if (alt_path)
2383 path = alt_path;
2384
2385 yaffsfs_Lock();
2386 parent = yaffsfs_FindDirectory(NULL, path, &name, 0, &notDir, &loop);
2387 if (!parent && notDir)
2388 yaffsfs_SetError(-ENOTDIR);
2389 else if (loop)
2390 yaffsfs_SetError(-ELOOP);
2391 else if (!parent)
2392 yaffsfs_SetError(-ENOENT);
2393 else if (yaffsfs_TooManyObjects(parent->my_dev))
2394 yaffsfs_SetError(-ENFILE);
2395 else if (yaffs_strnlen(name, 5) == 0) {
2396 /* Trying to make the root itself */
2397 yaffsfs_SetError(-EEXIST);
2398 } else if (parent->my_dev->read_only)
2399 yaffsfs_SetError(-EROFS);
2400 else {
2401 dir = yaffs_create_dir(parent, name, mode, 0, 0);
2402 if (dir)
2403 retVal = 0;
2404 else if (yaffs_find_by_name(parent, name))
2405 yaffsfs_SetError(-EEXIST); /* name exists */
2406 else
2407 yaffsfs_SetError(-ENOSPC); /* assume no space */
2408 }
2409
2410 yaffsfs_Unlock();
2411
2412 kfree(alt_path);
2413
2414 return retVal;
2415 }
2416
2417 int yaffs_rmdir(const YCHAR *path)
2418 {
2419 int result;
2420 YCHAR *alt_path;
2421
2422 if (!path) {
2423 yaffsfs_SetError(-EFAULT);
2424 return -1;
2425 }
2426
2427 if (yaffsfs_CheckPath(path) < 0) {
2428 yaffsfs_SetError(-ENAMETOOLONG);
2429 return -1;
2430 }
2431
2432 if (yaffsfs_alt_dir_path(path, &alt_path) < 0) {
2433 yaffsfs_SetError(-ENOMEM);
2434 return -1;
2435 }
2436 if (alt_path)
2437 path = alt_path;
2438 result = yaffsfs_DoUnlink(path, 1);
2439
2440 kfree(alt_path);
2441
2442 return result;
2443 }
2444
2445 void *yaffs_getdev(const YCHAR *path)
2446 {
2447 struct yaffs_dev *dev = NULL;
2448 YCHAR *dummy;
2449 dev = yaffsfs_FindDevice(path, &dummy);
2450 return (void *)dev;
2451 }
2452
2453 int yaffs_mount_common(const YCHAR *path, int read_only, int skip_checkpt)
2454 {
2455 int retVal = -1;
2456 int result = YAFFS_FAIL;
2457 struct yaffs_dev *dev = NULL;
2458
2459 if (!path) {
2460 yaffsfs_SetError(-EFAULT);
2461 return -1;
2462 }
2463
2464 yaffs_trace(YAFFS_TRACE_MOUNT, "yaffs: Mounting %s", path);
2465
2466 if (yaffsfs_CheckPath(path) < 0) {
2467 yaffsfs_SetError(-ENAMETOOLONG);
2468 return -1;
2469 }
2470
2471 yaffsfs_Lock();
2472
2473 yaffsfs_InitHandles();
2474
2475 dev = yaffsfs_FindMountPoint(path);
2476 if (dev) {
2477 if (!dev->is_mounted) {
2478 dev->read_only = read_only ? 1 : 0;
2479 if (skip_checkpt) {
2480 u8 skip = dev->param.skip_checkpt_rd;
2481 dev->param.skip_checkpt_rd = 1;
2482 result = yaffs_guts_initialise(dev);
2483 dev->param.skip_checkpt_rd = skip;
2484 } else {
2485 result = yaffs_guts_initialise(dev);
2486 }
2487
2488 if (result == YAFFS_FAIL)
2489 yaffsfs_SetError(-ENOMEM);
2490 retVal = result ? 0 : -1;
2491
2492 } else
2493 yaffsfs_SetError(-EBUSY);
2494 } else
2495 yaffsfs_SetError(-ENODEV);
2496
2497 yaffsfs_Unlock();
2498 return retVal;
2499
2500 }
2501
2502 int yaffs_mount2(const YCHAR *path, int readonly)
2503 {
2504 return yaffs_mount_common(path, readonly, 0);
2505 }
2506
2507 int yaffs_mount(const YCHAR *path)
2508 {
2509 return yaffs_mount_common(path, 0, 0);
2510 }
2511
2512 int yaffs_sync(const YCHAR *path)
2513 {
2514 int retVal = -1;
2515 struct yaffs_dev *dev = NULL;
2516 YCHAR *dummy;
2517
2518 if (!path) {
2519 yaffsfs_SetError(-EFAULT);
2520 return -1;
2521 }
2522
2523 if (yaffsfs_CheckPath(path) < 0) {
2524 yaffsfs_SetError(-ENAMETOOLONG);
2525 return -1;
2526 }
2527
2528 yaffsfs_Lock();
2529 dev = yaffsfs_FindDevice(path, &dummy);
2530 if (dev) {
2531 if (!dev->is_mounted)
2532 yaffsfs_SetError(-EINVAL);
2533 else if (dev->read_only)
2534 yaffsfs_SetError(-EROFS);
2535 else {
2536
2537 yaffs_flush_whole_cache(dev);
2538 yaffs_checkpoint_save(dev);
2539 retVal = 0;
2540
2541 }
2542 } else
2543 yaffsfs_SetError(-ENODEV);
2544
2545 yaffsfs_Unlock();
2546 return retVal;
2547 }
2548
2549 static int yaffsfs_IsDevBusy(struct yaffs_dev *dev)
2550 {
2551 int i;
2552 struct yaffs_obj *obj;
2553
2554 for (i = 0; i < YAFFSFS_N_HANDLES; i++) {
2555 obj = yaffsfs_HandleToObject(i);
2556 if (obj && obj->my_dev == dev)
2557 return 1;
2558 }
2559 return 0;
2560 }
2561
2562 int yaffs_remount(const YCHAR *path, int force, int read_only)
2563 {
2564 int retVal = -1;
2565 struct yaffs_dev *dev = NULL;
2566
2567 if (!path) {
2568 yaffsfs_SetError(-EFAULT);
2569 return -1;
2570 }
2571
2572 if (yaffsfs_CheckPath(path) < 0) {
2573 yaffsfs_SetError(-ENAMETOOLONG);
2574 return -1;
2575 }
2576
2577 yaffsfs_Lock();
2578 dev = yaffsfs_FindMountPoint(path);
2579 if (dev) {
2580 if (dev->is_mounted) {
2581 yaffs_flush_whole_cache(dev);
2582
2583 if (force || !yaffsfs_IsDevBusy(dev)) {
2584 if (read_only)
2585 yaffs_checkpoint_save(dev);
2586 dev->read_only = read_only ? 1 : 0;
2587 retVal = 0;
2588 } else
2589 yaffsfs_SetError(-EBUSY);
2590
2591 } else
2592 yaffsfs_SetError(-EINVAL);
2593
2594 } else
2595 yaffsfs_SetError(-ENODEV);
2596
2597 yaffsfs_Unlock();
2598 return retVal;
2599
2600 }
2601
2602 int yaffs_unmount2(const YCHAR *path, int force)
2603 {
2604 int retVal = -1;
2605 struct yaffs_dev *dev = NULL;
2606
2607 if (!path) {
2608 yaffsfs_SetError(-EFAULT);
2609 return -1;
2610 }
2611
2612 if (yaffsfs_CheckPath(path) < 0) {
2613 yaffsfs_SetError(-ENAMETOOLONG);
2614 return -1;
2615 }
2616
2617 yaffsfs_Lock();
2618 dev = yaffsfs_FindMountPoint(path);
2619 if (dev) {
2620 if (dev->is_mounted) {
2621 int inUse;
2622 yaffs_flush_whole_cache(dev);
2623 yaffs_checkpoint_save(dev);
2624 inUse = yaffsfs_IsDevBusy(dev);
2625 if (!inUse || force) {
2626 if (inUse)
2627 yaffsfs_BreakDeviceHandles(dev);
2628 yaffs_deinitialise(dev);
2629
2630 retVal = 0;
2631 } else
2632 yaffsfs_SetError(-EBUSY);
2633
2634 } else
2635 yaffsfs_SetError(-EINVAL);
2636
2637 } else
2638 yaffsfs_SetError(-ENODEV);
2639
2640 yaffsfs_Unlock();
2641 return retVal;
2642
2643 }
2644
2645 int yaffs_unmount(const YCHAR *path)
2646 {
2647 return yaffs_unmount2(path, 0);
2648 }
2649
2650 loff_t yaffs_freespace(const YCHAR *path)
2651 {
2652 loff_t retVal = -1;
2653 struct yaffs_dev *dev = NULL;
2654 YCHAR *dummy;
2655
2656 if (!path) {
2657 yaffsfs_SetError(-EFAULT);
2658 return -1;
2659 }
2660
2661 if (yaffsfs_CheckPath(path) < 0) {
2662 yaffsfs_SetError(-ENAMETOOLONG);
2663 return -1;
2664 }
2665
2666 yaffsfs_Lock();
2667 dev = yaffsfs_FindDevice(path, &dummy);
2668 if (dev && dev->is_mounted) {
2669 retVal = yaffs_get_n_free_chunks(dev);
2670 retVal *= dev->data_bytes_per_chunk;
2671
2672 } else
2673 yaffsfs_SetError(-EINVAL);
2674
2675 yaffsfs_Unlock();
2676 return retVal;
2677 }
2678
2679 loff_t yaffs_totalspace(const YCHAR *path)
2680 {
2681 loff_t retVal = -1;
2682 struct yaffs_dev *dev = NULL;
2683 YCHAR *dummy;
2684
2685 if (!path) {
2686 yaffsfs_SetError(-EFAULT);
2687 return -1;
2688 }
2689
2690 if (yaffsfs_CheckPath(path) < 0) {
2691 yaffsfs_SetError(-ENAMETOOLONG);
2692 return -1;
2693 }
2694
2695 yaffsfs_Lock();
2696 dev = yaffsfs_FindDevice(path, &dummy);
2697 if (dev && dev->is_mounted) {
2698 retVal = (dev->param.end_block - dev->param.start_block + 1) -
2699 dev->param.n_reserved_blocks;
2700 retVal *= dev->param.chunks_per_block;
2701 retVal *= dev->data_bytes_per_chunk;
2702
2703 } else
2704 yaffsfs_SetError(-EINVAL);
2705
2706 yaffsfs_Unlock();
2707 return retVal;
2708 }
2709
2710 int yaffs_inodecount(const YCHAR *path)
2711 {
2712 loff_t retVal = -1;
2713 struct yaffs_dev *dev = NULL;
2714 YCHAR *dummy;
2715
2716 if (!path) {
2717 yaffsfs_SetError(-EFAULT);
2718 return -1;
2719 }
2720
2721 if (yaffsfs_CheckPath(path) < 0) {
2722 yaffsfs_SetError(-ENAMETOOLONG);
2723 return -1;
2724 }
2725
2726 yaffsfs_Lock();
2727 dev = yaffsfs_FindDevice(path, &dummy);
2728 if (dev && dev->is_mounted) {
2729 int n_obj = dev->n_obj;
2730 if (n_obj > dev->n_hardlinks)
2731 retVal = n_obj - dev->n_hardlinks;
2732 }
2733
2734 if (retVal < 0)
2735 yaffsfs_SetError(-EINVAL);
2736
2737 yaffsfs_Unlock();
2738 return retVal;
2739 }
2740
2741 void yaffs_add_device(struct yaffs_dev *dev)
2742 {
2743 struct list_head *cfg;
2744 /* First check that the device is not in the list. */
2745
2746 list_for_each(cfg, &yaffsfs_deviceList) {
2747 if (dev == list_entry(cfg, struct yaffs_dev, dev_list))
2748 return;
2749 }
2750
2751 dev->is_mounted = 0;
2752 dev->param.remove_obj_fn = yaffsfs_RemoveObjectCallback;
2753
2754 if (!dev->dev_list.next)
2755 INIT_LIST_HEAD(&dev->dev_list);
2756
2757 list_add(&dev->dev_list, &yaffsfs_deviceList);
2758 }
2759
2760 void yaffs_remove_device(struct yaffs_dev *dev)
2761 {
2762 list_del_init(&dev->dev_list);
2763 }
2764
2765 /* Functions to iterate through devices. NB Use with extreme care! */
2766
2767 static struct list_head *dev_iterator;
2768 void yaffs_dev_rewind(void)
2769 {
2770 dev_iterator = yaffsfs_deviceList.next;
2771 }
2772
2773 struct yaffs_dev *yaffs_next_dev(void)
2774 {
2775 struct yaffs_dev *retval;
2776
2777 if (!dev_iterator)
2778 return NULL;
2779 if (dev_iterator == &yaffsfs_deviceList)
2780 return NULL;
2781
2782 retval = list_entry(dev_iterator, struct yaffs_dev, dev_list);
2783 dev_iterator = dev_iterator->next;
2784 return retval;
2785 }
2786
2787 /* Directory search stuff. */
2788
2789 static struct list_head search_contexts;
2790
2791 static void yaffsfs_SetDirRewound(struct yaffsfs_DirSearchContxt *dsc)
2792 {
2793 if (dsc &&
2794 dsc->dirObj &&
2795 dsc->dirObj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
2796
2797 dsc->offset = 0;
2798
2799 if (list_empty(&dsc->dirObj->variant.dir_variant.children))
2800 dsc->nextReturn = NULL;
2801 else
2802 dsc->nextReturn =
2803 list_entry(dsc->dirObj->variant.dir_variant.
2804 children.next, struct yaffs_obj,
2805 siblings);
2806 } else {
2807 /* Hey someone isn't playing nice! */
2808 }
2809 }
2810
2811 static void yaffsfs_DirAdvance(struct yaffsfs_DirSearchContxt *dsc)
2812 {
2813 if (dsc &&
2814 dsc->dirObj &&
2815 dsc->dirObj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) {
2816
2817 if (dsc->nextReturn == NULL ||
2818 list_empty(&dsc->dirObj->variant.dir_variant.children))
2819 dsc->nextReturn = NULL;
2820 else {
2821 struct list_head *next = dsc->nextReturn->siblings.next;
2822
2823 if (next == &dsc->dirObj->variant.dir_variant.children)
2824 dsc->nextReturn = NULL; /* end of list */
2825 else
2826 dsc->nextReturn = list_entry(next,
2827 struct yaffs_obj,
2828 siblings);
2829 }
2830 } else {
2831 /* Hey someone isn't playing nice! */
2832 }
2833 }
2834
2835 static void yaffsfs_RemoveObjectCallback(struct yaffs_obj *obj)
2836 {
2837
2838 struct list_head *i;
2839 struct yaffsfs_DirSearchContxt *dsc;
2840
2841 /* if search contexts not initilised then skip */
2842 if (!search_contexts.next)
2843 return;
2844
2845 /* Iterate through the directory search contexts.
2846 * If any are the one being removed, then advance the dsc to
2847 * the next one to prevent a hanging ptr.
2848 */
2849 list_for_each(i, &search_contexts) {
2850 if (i) {
2851 dsc = list_entry(i, struct yaffsfs_DirSearchContxt,
2852 others);
2853 if (dsc->nextReturn == obj)
2854 yaffsfs_DirAdvance(dsc);
2855 }
2856 }
2857
2858 }
2859
2860 yaffs_DIR *yaffs_opendir(const YCHAR *dirname)
2861 {
2862 yaffs_DIR *dir = NULL;
2863 struct yaffs_obj *obj = NULL;
2864 struct yaffsfs_DirSearchContxt *dsc = NULL;
2865 int notDir = 0;
2866 int loop = 0;
2867
2868 if (!dirname) {
2869 yaffsfs_SetError(-EFAULT);
2870 return NULL;
2871 }
2872
2873 if (yaffsfs_CheckPath(dirname) < 0) {
2874 yaffsfs_SetError(-ENAMETOOLONG);
2875 return NULL;
2876 }
2877
2878 yaffsfs_Lock();
2879
2880 obj = yaffsfs_FindObject(NULL, dirname, 0, 1, NULL, &notDir, &loop);
2881
2882 if (!obj && notDir)
2883 yaffsfs_SetError(-ENOTDIR);
2884 else if (loop)
2885 yaffsfs_SetError(-ELOOP);
2886 else if (!obj)
2887 yaffsfs_SetError(-ENOENT);
2888 else if (obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
2889 yaffsfs_SetError(-ENOTDIR);
2890 else {
2891 int i;
2892
2893 for (i = 0, dsc = NULL; i < YAFFSFS_N_DSC && !dsc; i++) {
2894 if (!yaffsfs_dsc[i].inUse)
2895 dsc = &yaffsfs_dsc[i];
2896 }
2897
2898 dir = (yaffs_DIR *) dsc;
2899
2900 if (dsc) {
2901 memset(dsc, 0, sizeof(struct yaffsfs_DirSearchContxt));
2902 dsc->inUse = 1;
2903 dsc->dirObj = obj;
2904 yaffs_strncpy(dsc->name, dirname, NAME_MAX);
2905 INIT_LIST_HEAD(&dsc->others);
2906
2907 if (!search_contexts.next)
2908 INIT_LIST_HEAD(&search_contexts);
2909
2910 list_add(&dsc->others, &search_contexts);
2911 yaffsfs_SetDirRewound(dsc);
2912 }
2913
2914 }
2915
2916 yaffsfs_Unlock();
2917
2918 return dir;
2919 }
2920
2921 struct yaffs_dirent *yaffs_readdir(yaffs_DIR * dirp)
2922 {
2923 struct yaffsfs_DirSearchContxt *dsc;
2924 struct yaffs_dirent *retVal = NULL;
2925
2926 dsc = (struct yaffsfs_DirSearchContxt *) dirp;
2927 yaffsfs_Lock();
2928
2929 if (dsc && dsc->inUse) {
2930 yaffsfs_SetError(0);
2931 if (dsc->nextReturn) {
2932 dsc->de.d_ino =
2933 yaffs_get_equivalent_obj(dsc->nextReturn)->obj_id;
2934 dsc->de.d_dont_use = (unsigned)dsc->nextReturn;
2935 dsc->de.d_off = dsc->offset++;
2936 yaffs_get_obj_name(dsc->nextReturn,
2937 dsc->de.d_name, NAME_MAX);
2938 if (yaffs_strnlen(dsc->de.d_name, NAME_MAX + 1) == 0) {
2939 /* this should not happen! */
2940 yaffs_strcpy(dsc->de.d_name, _Y("zz"));
2941 }
2942 dsc->de.d_reclen = sizeof(struct yaffs_dirent);
2943 retVal = &dsc->de;
2944 yaffsfs_DirAdvance(dsc);
2945 } else
2946 retVal = NULL;
2947 } else
2948 yaffsfs_SetError(-EBADF);
2949
2950 yaffsfs_Unlock();
2951
2952 return retVal;
2953
2954 }
2955
2956 void yaffs_rewinddir(yaffs_DIR *dirp)
2957 {
2958 struct yaffsfs_DirSearchContxt *dsc;
2959
2960 dsc = (struct yaffsfs_DirSearchContxt *) dirp;
2961
2962 yaffsfs_Lock();
2963
2964 yaffsfs_SetDirRewound(dsc);
2965
2966 yaffsfs_Unlock();
2967 }
2968
2969 int yaffs_closedir(yaffs_DIR *dirp)
2970 {
2971 struct yaffsfs_DirSearchContxt *dsc;
2972
2973 dsc = (struct yaffsfs_DirSearchContxt *) dirp;
2974
2975 if (!dsc) {
2976 yaffsfs_SetError(-EFAULT);
2977 return -1;
2978 }
2979
2980 yaffsfs_Lock();
2981 dsc->inUse = 0;
2982 list_del(&dsc->others); /* unhook from list */
2983 yaffsfs_Unlock();
2984 return 0;
2985 }
2986
2987 /* End of directory stuff */
2988
2989 int yaffs_symlink(const YCHAR *oldpath, const YCHAR *newpath)
2990 {
2991 struct yaffs_obj *parent = NULL;
2992 struct yaffs_obj *obj;
2993 YCHAR *name;
2994 int retVal = -1;
2995 int mode = 0; /* ignore for now */
2996 int notDir = 0;
2997 int loop = 0;
2998
2999 if (!oldpath || !newpath) {
3000 yaffsfs_SetError(-EFAULT);
3001 return -1;
3002 }
3003
3004 if (yaffsfs_CheckPath(newpath) < 0 || yaffsfs_CheckPath(oldpath) < 0) {
3005 yaffsfs_SetError(-ENAMETOOLONG);
3006 return -1;
3007 }
3008
3009 yaffsfs_Lock();
3010 parent = yaffsfs_FindDirectory(NULL, newpath, &name, 0, &notDir, &loop);
3011 if (!parent && notDir)
3012 yaffsfs_SetError(-ENOTDIR);
3013 else if (loop)
3014 yaffsfs_SetError(-ELOOP);
3015 else if (!parent || yaffs_strnlen(name, 5) < 1)
3016 yaffsfs_SetError(-ENOENT);
3017 else if (yaffsfs_TooManyObjects(parent->my_dev))
3018 yaffsfs_SetError(-ENFILE);
3019 else if (parent->my_dev->read_only)
3020 yaffsfs_SetError(-EROFS);
3021 else {
3022 obj = yaffs_create_symlink(parent, name, mode, 0, 0, oldpath);
3023 if (obj)
3024 retVal = 0;
3025 else if (yaffsfs_FindObject
3026 (NULL, newpath, 0, 0, NULL, NULL, NULL))
3027 yaffsfs_SetError(-EEXIST);
3028 else
3029 yaffsfs_SetError(-ENOSPC);
3030 }
3031
3032 yaffsfs_Unlock();
3033
3034 return retVal;
3035
3036 }
3037
3038 int yaffs_readlink(const YCHAR *path, YCHAR *buf, int bufsiz)
3039 {
3040 struct yaffs_obj *obj = NULL;
3041 struct yaffs_obj *dir = NULL;
3042 int retVal = -1;
3043 int notDir = 0;
3044 int loop = 0;
3045
3046 if (!path || !buf) {
3047 yaffsfs_SetError(-EFAULT);
3048 return -1;
3049 }
3050
3051 yaffsfs_Lock();
3052
3053 obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, &notDir, &loop);
3054
3055 if (!dir && notDir)
3056 yaffsfs_SetError(-ENOTDIR);
3057 else if (loop)
3058 yaffsfs_SetError(-ELOOP);
3059 else if (!dir || !obj)
3060 yaffsfs_SetError(-ENOENT);
3061 else if (obj->variant_type != YAFFS_OBJECT_TYPE_SYMLINK)
3062 yaffsfs_SetError(-EINVAL);
3063 else {
3064 YCHAR *alias = obj->variant.symlink_variant.alias;
3065 memset(buf, 0, bufsiz);
3066 yaffs_strncpy(buf, alias, bufsiz - 1);
3067 retVal = 0;
3068 }
3069 yaffsfs_Unlock();
3070 return retVal;
3071 }
3072
3073 int yaffs_link(const YCHAR *oldpath, const YCHAR *linkpath)
3074 {
3075 /* Creates a link called newpath to existing oldpath */
3076 struct yaffs_obj *obj = NULL;
3077 struct yaffs_obj *lnk = NULL;
3078 struct yaffs_obj *obj_dir = NULL;
3079 struct yaffs_obj *lnk_dir = NULL;
3080 int retVal = -1;
3081 int notDirObj = 0;
3082 int notDirLnk = 0;
3083 int objLoop = 0;
3084 int lnkLoop = 0;
3085 YCHAR *newname;
3086
3087 if (!oldpath || !linkpath) {
3088 yaffsfs_SetError(-EFAULT);
3089 return -1;
3090 }
3091
3092 if (yaffsfs_CheckPath(linkpath) < 0 || yaffsfs_CheckPath(oldpath) < 0) {
3093 yaffsfs_SetError(-ENAMETOOLONG);
3094 return -1;
3095 }
3096
3097 yaffsfs_Lock();
3098
3099 obj = yaffsfs_FindObject(NULL, oldpath, 0, 1,
3100 &obj_dir, &notDirObj, &objLoop);
3101 lnk = yaffsfs_FindObject(NULL, linkpath, 0, 0, NULL, NULL, NULL);
3102 lnk_dir = yaffsfs_FindDirectory(NULL, linkpath, &newname,
3103 0, &notDirLnk, &lnkLoop);
3104
3105 if ((!obj_dir && notDirObj) || (!lnk_dir && notDirLnk))
3106 yaffsfs_SetError(-ENOTDIR);
3107 else if (objLoop || lnkLoop)
3108 yaffsfs_SetError(-ELOOP);
3109 else if (!obj_dir || !lnk_dir || !obj)
3110 yaffsfs_SetError(-ENOENT);
3111 else if (obj->my_dev->read_only)
3112 yaffsfs_SetError(-EROFS);
3113 else if (yaffsfs_TooManyObjects(obj->my_dev))
3114 yaffsfs_SetError(-ENFILE);
3115 else if (lnk)
3116 yaffsfs_SetError(-EEXIST);
3117 else if (lnk_dir->my_dev != obj->my_dev)
3118 yaffsfs_SetError(-EXDEV);
3119 else {
3120 retVal = yaffsfs_CheckNameLength(newname);
3121
3122 if (retVal == 0) {
3123 lnk = yaffs_link_obj(lnk_dir, newname, obj);
3124 if (lnk)
3125 retVal = 0;
3126 else {
3127 yaffsfs_SetError(-ENOSPC);
3128 retVal = -1;
3129 }
3130 }
3131 }
3132 yaffsfs_Unlock();
3133
3134 return retVal;
3135 }
3136
3137 int yaffs_mknod(const YCHAR *pathname, mode_t mode, dev_t dev)
3138 {
3139 yaffsfs_SetError(-EINVAL);
3140 return -1;
3141 }
3142
3143 /*
3144 * D E B U G F U N C T I O N S
3145 */
3146
3147 /*
3148 * yaffs_n_handles()
3149 * Returns number of handles attached to the object
3150 */
3151 int yaffs_n_handles(const YCHAR *path)
3152 {
3153 struct yaffs_obj *obj;
3154
3155 if (!path) {
3156 yaffsfs_SetError(-EFAULT);
3157 return -1;
3158 }
3159
3160 if (yaffsfs_CheckPath(path) < 0) {
3161 yaffsfs_SetError(-ENAMETOOLONG);
3162 return -1;
3163 }
3164
3165 obj = yaffsfs_FindObject(NULL, path, 0, 1, NULL, NULL, NULL);
3166
3167 if (obj)
3168 return yaffsfs_CountHandles(obj);
3169 else
3170 return -1;
3171 }
3172
3173 int yaffs_get_error(void)
3174 {
3175 return yaffsfs_GetLastError();
3176 }
3177
3178 int yaffs_set_error(int error)
3179 {
3180 yaffsfs_SetError(error);
3181 return 0;
3182 }
3183
3184 int yaffs_dump_dev(const YCHAR *path)
3185 {
3186 #if 0
3187 YCHAR *rest;
3188
3189 struct yaffs_obj *obj = yaffsfs_FindRoot(path, &rest);
3190
3191 if (obj) {
3192 struct yaffs_dev *dev = obj->my_dev;
3193
3194 printf("\n"
3195 "n_page_writes.......... %d\n"
3196 "n_page_reads........... %d\n"
3197 "n_erasures....... %d\n"
3198 "n_gc_copies............ %d\n"
3199 "garbageCollections... %d\n"
3200 "passiveGarbageColl'ns %d\n"
3201 "\n",
3202 dev->n_page_writes,
3203 dev->n_page_reads,
3204 dev->n_erasures,
3205 dev->n_gc_copies,
3206 dev->garbageCollections, dev->passiveGarbageCollections);
3207
3208 }
3209 #endif
3210 return 0;
3211 }
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