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