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Commit | Line | Data |
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0e8cc8bd WJ |
1 | /* |
2 | * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. | |
3 | * | |
753ac610 | 4 | * Copyright (C) 2002-2011 Aleph One Ltd. |
0e8cc8bd WJ |
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 | */ | |
4b070809 | 13 | |
6b44adc2 | 14 | #include <div64.h> |
0e8cc8bd WJ |
15 | #include "yaffsfs.h" |
16 | #include "yaffs_guts.h" | |
17 | #include "yaffscfg.h" | |
0e8cc8bd | 18 | #include "yportenv.h" |
753ac610 | 19 | #include "yaffs_trace.h" |
0e8cc8bd WJ |
20 | |
21 | #define YAFFSFS_MAX_SYMLINK_DEREFERENCES 5 | |
22 | ||
23 | #ifndef NULL | |
24 | #define NULL ((void *)0) | |
25 | #endif | |
26 | ||
753ac610 CM |
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) | |
0e8cc8bd | 30 | |
753ac610 CM |
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); | |
0e8cc8bd | 37 | |
753ac610 | 38 | static void yaffsfs_RemoveObjectCallback(struct yaffs_obj *obj); |
0e8cc8bd | 39 | |
753ac610 | 40 | unsigned int yaffs_wr_attempts; |
0e8cc8bd | 41 | |
753ac610 CM |
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 | */ | |
0e8cc8bd | 62 | |
753ac610 CM |
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 | }; | |
0e8cc8bd | 94 | |
753ac610 CM |
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]; | |
0e8cc8bd | 99 | |
753ac610 | 100 | static int yaffsfs_handlesInitialised; |
0e8cc8bd | 101 | |
753ac610 | 102 | unsigned yaffs_set_trace(unsigned tm) |
0e8cc8bd | 103 | { |
753ac610 CM |
104 | yaffs_trace_mask = tm; |
105 | return yaffs_trace_mask; | |
106 | } | |
0e8cc8bd | 107 | |
753ac610 CM |
108 | unsigned yaffs_get_trace(void) |
109 | { | |
110 | return yaffs_trace_mask; | |
111 | } | |
0e8cc8bd | 112 | |
753ac610 CM |
113 | /* |
114 | * yaffsfs_InitHandle | |
115 | * Inilitalise handle management on start-up. | |
116 | */ | |
0e8cc8bd | 117 | |
753ac610 | 118 | static void yaffsfs_InitHandles(void) |
0e8cc8bd WJ |
119 | { |
120 | int i; | |
753ac610 CM |
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; | |
0e8cc8bd WJ |
133 | } |
134 | ||
753ac610 | 135 | static struct yaffsfs_Handle *yaffsfs_HandleToPointer(int h) |
0e8cc8bd | 136 | { |
753ac610 CM |
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]; | |
4b070809 | 148 | |
753ac610 | 149 | return NULL; |
0e8cc8bd WJ |
150 | } |
151 | ||
753ac610 | 152 | static struct yaffsfs_Inode *yaffsfs_HandleToInode(int handle) |
0e8cc8bd | 153 | { |
753ac610 | 154 | struct yaffsfs_FileDes *fd = yaffsfs_HandleToFileDes(handle); |
0e8cc8bd | 155 | |
753ac610 CM |
156 | if (fd && fd->handleCount > 0 && |
157 | fd->inodeId >= 0 && fd->inodeId < YAFFSFS_N_HANDLES) | |
158 | return &yaffsfs_inode[fd->inodeId]; | |
4b070809 | 159 | |
0e8cc8bd WJ |
160 | return NULL; |
161 | } | |
162 | ||
753ac610 CM |
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 | */ | |
0e8cc8bd | 177 | |
753ac610 CM |
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 | } | |
0e8cc8bd | 193 | |
753ac610 CM |
194 | /* |
195 | * yaffsfs_GetInodeIdForObject | |
196 | * Grab an inode entry when opening a new inode. | |
197 | */ | |
198 | static int yaffsfs_GetInodeIdForObject(struct yaffs_obj *obj) | |
0e8cc8bd WJ |
199 | { |
200 | int i; | |
753ac610 CM |
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; | |
0e8cc8bd | 257 | } |
753ac610 CM |
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; | |
0e8cc8bd WJ |
274 | return i; |
275 | } | |
276 | } | |
277 | return -1; | |
278 | } | |
279 | ||
753ac610 CM |
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) | |
0e8cc8bd | 313 | { |
753ac610 CM |
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 | */ | |
4b070809 | 328 | |
753ac610 CM |
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 | } | |
0e8cc8bd WJ |
342 | } |
343 | return 0; | |
344 | } | |
345 | ||
753ac610 CM |
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 | } | |
0e8cc8bd | 360 | |
753ac610 CM |
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 | } | |
0e8cc8bd | 382 | |
753ac610 CM |
383 | /* |
384 | * Stuff to handle names. | |
385 | */ | |
386 | #ifdef CONFIG_YAFFS_CASE_INSENSITIVE | |
0e8cc8bd | 387 | |
753ac610 CM |
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 | } | |
0e8cc8bd | 395 | |
753ac610 | 396 | int yaffsfs_Match(YCHAR a, YCHAR b) |
0e8cc8bd | 397 | { |
753ac610 CM |
398 | return (yaffs_toupper(a) == yaffs_toupper(b)); |
399 | } | |
400 | #else | |
401 | int yaffsfs_Match(YCHAR a, YCHAR b) | |
402 | { | |
403 | /* case sensitive */ | |
0e8cc8bd WJ |
404 | return (a == b); |
405 | } | |
753ac610 CM |
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 | } | |
0e8cc8bd | 469 | |
753ac610 CM |
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) | |
0e8cc8bd | 481 | { |
753ac610 CM |
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; | |
0e8cc8bd WJ |
487 | int thisMatchLength; |
488 | int longestMatch = -1; | |
753ac610 | 489 | int matching; |
4b070809 | 490 | |
753ac610 CM |
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); | |
0e8cc8bd | 498 | leftOver = path; |
753ac610 | 499 | p = dev->param.name; |
0e8cc8bd | 500 | thisMatchLength = 0; |
753ac610 CM |
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 | } | |
4b070809 | 525 | |
753ac610 CM |
526 | /* Skip over any /s in leftOver */ |
527 | while (yaffsfs_IsPathDivider(*leftOver)) | |
0e8cc8bd | 528 | leftOver++; |
753ac610 CM |
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; | |
0e8cc8bd WJ |
542 | longestMatch = thisMatchLength; |
543 | } | |
753ac610 | 544 | |
0e8cc8bd WJ |
545 | } |
546 | return retval; | |
547 | } | |
548 | ||
753ac610 | 549 | static int yaffsfs_CheckPath(const YCHAR *path) |
0e8cc8bd | 550 | { |
753ac610 CM |
551 | int n = 0; |
552 | int divs = 0; | |
0e8cc8bd | 553 | |
753ac610 CM |
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++; | |
0e8cc8bd | 561 | } |
753ac610 CM |
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 | ||
0e8cc8bd WJ |
587 | return NULL; |
588 | } | |
589 | ||
753ac610 CM |
590 | static struct yaffs_obj *yaffsfs_FollowLink(struct yaffs_obj *obj, |
591 | int symDepth, int *loop) | |
0e8cc8bd WJ |
592 | { |
593 | ||
753ac610 CM |
594 | if (obj) |
595 | obj = yaffs_get_equivalent_obj(obj); | |
4b070809 | 596 | |
753ac610 CM |
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); | |
0e8cc8bd | 604 | else |
753ac610 CM |
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); | |
0e8cc8bd WJ |
611 | } |
612 | return obj; | |
613 | } | |
614 | ||
753ac610 CM |
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) | |
0e8cc8bd | 625 | { |
753ac610 CM |
626 | struct yaffs_obj *dir; |
627 | YCHAR *restOfPath; | |
628 | YCHAR str[YAFFS_MAX_NAME_LENGTH + 1]; | |
0e8cc8bd | 629 | int i; |
4b070809 | 630 | |
753ac610 CM |
631 | if (symDepth > YAFFSFS_MAX_SYMLINK_DEREFERENCES) { |
632 | if (loop) | |
633 | *loop = 1; | |
0e8cc8bd WJ |
634 | return NULL; |
635 | } | |
4b070809 | 636 | |
753ac610 | 637 | if (startDir) { |
0e8cc8bd | 638 | dir = startDir; |
753ac610 CM |
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 '/' */ | |
4b070809 | 651 | |
0e8cc8bd WJ |
652 | *name = restOfPath; |
653 | i = 0; | |
4b070809 | 654 | |
753ac610 CM |
655 | while (*restOfPath && !yaffsfs_IsPathDivider(*restOfPath)) { |
656 | if (i < YAFFS_MAX_NAME_LENGTH) { | |
0e8cc8bd | 657 | str[i] = *restOfPath; |
753ac610 | 658 | str[i + 1] = '\0'; |
0e8cc8bd WJ |
659 | i++; |
660 | } | |
661 | restOfPath++; | |
662 | } | |
4b070809 | 663 | |
753ac610 CM |
664 | if (!*restOfPath) |
665 | /* got to the end of the string */ | |
0e8cc8bd | 666 | return dir; |
753ac610 CM |
667 | else { |
668 | if (yaffs_strcmp(str, _Y(".")) == 0) { | |
669 | /* Do nothing */ | |
670 | } else if (yaffs_strcmp(str, _Y("..")) == 0) { | |
0e8cc8bd | 671 | dir = dir->parent; |
753ac610 CM |
672 | } else { |
673 | dir = yaffs_find_by_name(dir, str); | |
4b070809 | 674 | |
753ac610 | 675 | dir = yaffsfs_FollowLink(dir, symDepth, loop); |
4b070809 | 676 | |
753ac610 CM |
677 | if (dir && dir->variant_type != |
678 | YAFFS_OBJECT_TYPE_DIRECTORY) { | |
679 | if (notDir) | |
680 | *notDir = 1; | |
0e8cc8bd WJ |
681 | dir = NULL; |
682 | } | |
753ac610 | 683 | |
0e8cc8bd WJ |
684 | } |
685 | } | |
686 | } | |
753ac610 | 687 | /* directory did not exist. */ |
0e8cc8bd WJ |
688 | return NULL; |
689 | } | |
690 | ||
753ac610 CM |
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) | |
0e8cc8bd | 696 | { |
753ac610 CM |
697 | return yaffsfs_DoFindDirectory(relDir, path, name, symDepth, notDir, |
698 | loop); | |
0e8cc8bd WJ |
699 | } |
700 | ||
753ac610 CM |
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) | |
0e8cc8bd | 709 | { |
753ac610 CM |
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 | *************************************************************************/ | |
4b070809 | 734 | |
753ac610 CM |
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; | |
4b070809 | 741 | |
753ac610 CM |
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++; | |
0e8cc8bd | 750 | } |
4b070809 | 751 | |
753ac610 CM |
752 | yaffsfs_Unlock(); |
753 | ||
754 | if (!existingFD) | |
755 | yaffsfs_SetError(-EBADF); | |
756 | else if (!newHandle) | |
757 | yaffsfs_SetError(-ENOMEM); | |
758 | ||
759 | return newHandleNumber; | |
760 | ||
0e8cc8bd WJ |
761 | } |
762 | ||
753ac610 CM |
763 | static int yaffsfs_TooManyObjects(struct yaffs_dev *dev) |
764 | { | |
765 | int current_objects = dev->n_obj - dev->n_deleted_files; | |
0e8cc8bd | 766 | |
753ac610 CM |
767 | if (dev->param.max_objects && current_objects > dev->param.max_objects) |
768 | return 1; | |
769 | else | |
770 | return 0; | |
771 | } | |
0e8cc8bd | 772 | |
753ac610 | 773 | int yaffs_open_sharing(const YCHAR *path, int oflag, int mode, int sharing) |
0e8cc8bd | 774 | { |
753ac610 CM |
775 | struct yaffs_obj *obj = NULL; |
776 | struct yaffs_obj *dir = NULL; | |
777 | YCHAR *name; | |
0e8cc8bd | 778 | int handle = -1; |
753ac610 | 779 | struct yaffsfs_FileDes *fd = NULL; |
0e8cc8bd WJ |
780 | int openDenied = 0; |
781 | int symDepth = 0; | |
782 | int errorReported = 0; | |
753ac610 CM |
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; | |
4b070809 | 794 | |
753ac610 CM |
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); | |
4b070809 | 808 | |
753ac610 CM |
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); | |
4b070809 | 812 | |
753ac610 | 813 | /* Todo: Are there any more flag combos to sanitise ? */ |
4b070809 | 814 | |
753ac610 CM |
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; | |
4b070809 | 819 | |
0e8cc8bd | 820 | yaffsfs_Lock(); |
4b070809 | 821 | |
753ac610 | 822 | handle = yaffsfs_NewHandleAndFileDes(); |
4b070809 | 823 | |
753ac610 CM |
824 | if (handle < 0) { |
825 | yaffsfs_SetError(-ENFILE); | |
826 | errorReported = 1; | |
827 | } else { | |
0e8cc8bd | 828 | |
753ac610 | 829 | fd = yaffsfs_HandleToFileDes(handle); |
4b070809 | 830 | |
753ac610 CM |
831 | /* try to find the exisiting object */ |
832 | obj = yaffsfs_FindObject(NULL, path, 0, 1, NULL, NULL, NULL); | |
4b070809 | 833 | |
753ac610 | 834 | obj = yaffsfs_FollowLink(obj, symDepth++, &loop); |
4b070809 | 835 | |
753ac610 CM |
836 | if (obj && |
837 | obj->variant_type != YAFFS_OBJECT_TYPE_FILE && | |
838 | obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) | |
839 | obj = NULL; | |
4b070809 | 840 | |
753ac610 | 841 | if (obj) { |
0e8cc8bd | 842 | |
753ac610 | 843 | /* The file already exists or it might be a directory */ |
0e8cc8bd | 844 | |
753ac610 CM |
845 | /* A directory can't be opened as a file */ |
846 | if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) { | |
0e8cc8bd | 847 | openDenied = 1; |
753ac610 CM |
848 | yaffsfs_SetError(-EISDIR); |
849 | errorReported = 1; | |
0e8cc8bd | 850 | } |
4b070809 | 851 | |
753ac610 CM |
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)) { | |
0e8cc8bd WJ |
857 | openDenied = 1; |
858 | yaffsfs_SetError(-EEXIST); | |
859 | errorReported = 1; | |
860 | } | |
4b070809 | 861 | |
753ac610 CM |
862 | /* Check file permissions */ |
863 | if (readRequested && !(obj->yst_mode & S_IREAD)) | |
0e8cc8bd | 864 | openDenied = 1; |
0e8cc8bd | 865 | |
753ac610 | 866 | if (writeRequested && !(obj->yst_mode & S_IWRITE)) |
0e8cc8bd | 867 | openDenied = 1; |
0e8cc8bd | 868 | |
753ac610 CM |
869 | if (!errorReported && writeRequested && |
870 | obj->my_dev->read_only) { | |
0e8cc8bd | 871 | openDenied = 1; |
753ac610 CM |
872 | yaffsfs_SetError(-EROFS); |
873 | errorReported = 1; | |
0e8cc8bd | 874 | } |
4b070809 | 875 | |
753ac610 CM |
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 | } | |
4b070809 | 906 | |
753ac610 CM |
907 | if ((!sharedReadAllowed && readRequested) || |
908 | (!shareRead && alreadyReading) || | |
909 | (!sharedWriteAllowed && writeRequested) || | |
910 | (!shareWrite && alreadyWriting)) { | |
911 | openDenied = 1; | |
912 | yaffsfs_SetError(-EBUSY); | |
913 | errorReported = 1; | |
914 | } | |
0e8cc8bd | 915 | } |
753ac610 CM |
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 | ¬Dir, &loop); | |
925 | if (!dir && notDir) { | |
0e8cc8bd | 926 | yaffsfs_SetError(-ENOTDIR); |
753ac610 CM |
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; | |
0e8cc8bd WJ |
934 | } |
935 | } | |
4b070809 | 936 | |
753ac610 CM |
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); | |
4b070809 | 947 | |
753ac610 CM |
948 | if (!obj && !errorReported) { |
949 | yaffsfs_SetError(-ENOSPC); | |
0e8cc8bd WJ |
950 | errorReported = 1; |
951 | } | |
0e8cc8bd | 952 | } |
4b070809 | 953 | |
753ac610 CM |
954 | if (!obj && dir && !errorReported && !(oflag & O_CREAT)) { |
955 | yaffsfs_SetError(-ENOENT); | |
956 | errorReported = 1; | |
957 | } | |
4b070809 | 958 | |
753ac610 CM |
959 | if (obj && !openDenied) { |
960 | int inodeId = yaffsfs_GetInodeIdForObject(obj); | |
4b070809 | 961 | |
753ac610 CM |
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 | } | |
0e8cc8bd | 969 | |
753ac610 CM |
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; | |
4b070809 | 1006 | |
0e8cc8bd WJ |
1007 | yaffsfs_Lock(); |
1008 | ||
753ac610 | 1009 | obj = yaffsfs_HandleToObject(handle); |
4b070809 | 1010 | |
753ac610 CM |
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); | |
0e8cc8bd WJ |
1017 | retVal = 0; |
1018 | } | |
753ac610 CM |
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) | |
4b070809 | 1052 | yaffsfs_SetError(-EBADF); |
753ac610 CM |
1053 | else { |
1054 | /* clean up */ | |
1055 | yaffs_flush_file(obj, 1, 0); | |
1056 | yaffsfs_PutHandle(handle); | |
1057 | retVal = 0; | |
0e8cc8bd | 1058 | } |
4b070809 | 1059 | |
0e8cc8bd | 1060 | yaffsfs_Unlock(); |
4b070809 | 1061 | |
0e8cc8bd WJ |
1062 | return retVal; |
1063 | } | |
1064 | ||
753ac610 CM |
1065 | int yaffsfs_do_read(int handle, void *vbuf, unsigned int nbyte, |
1066 | int isPread, loff_t offset) | |
0e8cc8bd | 1067 | { |
753ac610 CM |
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 | } | |
4b070809 | 1083 | |
0e8cc8bd | 1084 | yaffsfs_Lock(); |
753ac610 CM |
1085 | fd = yaffsfs_HandleToFileDes(handle); |
1086 | obj = yaffsfs_HandleToObject(handle); | |
4b070809 | 1087 | |
753ac610 CM |
1088 | if (!fd || !obj) { |
1089 | /* bad handle */ | |
4b070809 | 1090 | yaffsfs_SetError(-EBADF); |
753ac610 CM |
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; | |
0e8cc8bd | 1109 | else |
0e8cc8bd | 1110 | maxRead = 0; |
0e8cc8bd | 1111 | |
753ac610 | 1112 | if (nbyte > maxRead) |
0e8cc8bd | 1113 | nbyte = maxRead; |
753ac610 CM |
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; | |
0e8cc8bd WJ |
1124 | } |
1125 | ||
753ac610 CM |
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); | |
4b070809 | 1141 | |
753ac610 CM |
1142 | if (nRead > 0) { |
1143 | totalRead += nRead; | |
1144 | pos += nRead; | |
1145 | buf += nRead; | |
0e8cc8bd | 1146 | } |
753ac610 CM |
1147 | |
1148 | if (nRead == nToRead) | |
1149 | nbyte -= nRead; | |
0e8cc8bd | 1150 | else |
753ac610 CM |
1151 | nbyte = 0; /* no more to read */ |
1152 | ||
1153 | if (nbyte > 0) { | |
1154 | yaffsfs_Unlock(); | |
1155 | yaffsfs_Lock(); | |
0e8cc8bd | 1156 | } |
753ac610 | 1157 | |
0e8cc8bd | 1158 | } |
753ac610 CM |
1159 | |
1160 | yaffsfs_PutHandle(handle); | |
1161 | ||
1162 | if (!isPread) { | |
1163 | if (totalRead >= 0) | |
1164 | fd->position = startPos + totalRead; | |
1165 | else | |
1166 | yaffsfs_SetError(-EINVAL); | |
0e8cc8bd | 1167 | } |
4b070809 | 1168 | |
0e8cc8bd | 1169 | } |
4b070809 | 1170 | |
0e8cc8bd | 1171 | yaffsfs_Unlock(); |
4b070809 | 1172 | |
753ac610 | 1173 | return (totalRead >= 0) ? totalRead : -1; |
4b070809 | 1174 | |
753ac610 | 1175 | } |
4b070809 | 1176 | |
753ac610 CM |
1177 | int yaffs_read(int handle, void *buf, unsigned int nbyte) |
1178 | { | |
1179 | return yaffsfs_do_read(handle, buf, nbyte, 0, 0); | |
0e8cc8bd WJ |
1180 | } |
1181 | ||
753ac610 | 1182 | int yaffs_pread(int handle, void *buf, unsigned int nbyte, loff_t offset) |
0e8cc8bd | 1183 | { |
753ac610 CM |
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 | } | |
4b070809 | 1205 | |
0e8cc8bd | 1206 | yaffsfs_Lock(); |
753ac610 CM |
1207 | fd = yaffsfs_HandleToFileDes(handle); |
1208 | obj = yaffsfs_HandleToObject(handle); | |
4b070809 | 1209 | |
753ac610 CM |
1210 | if (!fd || !obj) { |
1211 | /* bad handle */ | |
4b070809 | 1212 | yaffsfs_SetError(-EBADF); |
753ac610 CM |
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; | |
0e8cc8bd | 1225 | else |
753ac610 | 1226 | startPos = fd->position; |
4b070809 | 1227 | |
753ac610 CM |
1228 | yaffsfs_GetHandle(handle); |
1229 | pos = startPos; | |
1230 | endPos = pos + nbyte; | |
4b070809 | 1231 | |
753ac610 CM |
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; | |
0e8cc8bd | 1237 | } |
753ac610 CM |
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 | } | |
0e8cc8bd | 1277 | } |
4b070809 | 1278 | |
753ac610 CM |
1279 | yaffsfs_PutHandle(handle); |
1280 | ||
1281 | if (!isPwrite) { | |
1282 | if (totalWritten > 0) | |
1283 | fd->position = startPos + totalWritten; | |
1284 | else | |
1285 | yaffsfs_SetError(-EINVAL); | |
1286 | } | |
0e8cc8bd | 1287 | } |
4b070809 | 1288 | |
0e8cc8bd | 1289 | yaffsfs_Unlock(); |
4b070809 | 1290 | |
753ac610 CM |
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, ¬Dir, &loop); | |
1325 | obj = yaffsfs_FollowLink(obj, 0, &loop); | |
4b070809 | 1326 | |
753ac610 CM |
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(); | |
0e8cc8bd | 1345 | |
753ac610 | 1346 | return (result) ? 0 : -1; |
0e8cc8bd WJ |
1347 | } |
1348 | ||
753ac610 | 1349 | int yaffs_ftruncate(int handle, loff_t new_size) |
0e8cc8bd | 1350 | { |
753ac610 CM |
1351 | struct yaffsfs_FileDes *fd = NULL; |
1352 | struct yaffs_obj *obj = NULL; | |
0e8cc8bd | 1353 | int result = 0; |
4b070809 | 1354 | |
0e8cc8bd | 1355 | yaffsfs_Lock(); |
753ac610 CM |
1356 | fd = yaffsfs_HandleToFileDes(handle); |
1357 | obj = yaffsfs_HandleToObject(handle); | |
4b070809 | 1358 | |
753ac610 CM |
1359 | if (!fd || !obj) |
1360 | /* bad handle */ | |
4b070809 | 1361 | yaffsfs_SetError(-EBADF); |
753ac610 CM |
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); | |
0e8cc8bd | 1368 | else |
753ac610 CM |
1369 | /* resize the file */ |
1370 | result = yaffs_resize_file(obj, new_size); | |
0e8cc8bd | 1371 | yaffsfs_Unlock(); |
4b070809 | 1372 | |
0e8cc8bd WJ |
1373 | return (result) ? 0 : -1; |
1374 | ||
1375 | } | |
1376 | ||
753ac610 | 1377 | loff_t yaffs_lseek(int handle, loff_t offset, int whence) |
0e8cc8bd | 1378 | { |
753ac610 CM |
1379 | struct yaffsfs_FileDes *fd = NULL; |
1380 | struct yaffs_obj *obj = NULL; | |
1381 | loff_t pos = -1; | |
1382 | loff_t fSize = -1; | |
4b070809 | 1383 | |
0e8cc8bd | 1384 | yaffsfs_Lock(); |
753ac610 CM |
1385 | fd = yaffsfs_HandleToFileDes(handle); |
1386 | obj = yaffsfs_HandleToObject(handle); | |
4b070809 | 1387 | |
753ac610 | 1388 | if (!fd || !obj) |
4b070809 | 1389 | yaffsfs_SetError(-EBADF); |
753ac610 CM |
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; | |
0e8cc8bd | 1403 | } |
4b070809 | 1404 | |
753ac610 CM |
1405 | if (pos >= 0 && pos <= YAFFS_MAX_FILE_SIZE) |
1406 | fd->position = pos; | |
1407 | else { | |
1408 | yaffsfs_SetError(-EINVAL); | |
1409 | pos = -1; | |
1410 | } | |
0e8cc8bd WJ |
1411 | } |
1412 | ||
0e8cc8bd | 1413 | yaffsfs_Unlock(); |
4b070809 | 1414 | |
0e8cc8bd WJ |
1415 | return pos; |
1416 | } | |
1417 | ||
753ac610 | 1418 | int yaffsfs_DoUnlink(const YCHAR *path, int isDirectory) |
0e8cc8bd | 1419 | { |
753ac610 CM |
1420 | struct yaffs_obj *dir = NULL; |
1421 | struct yaffs_obj *obj = NULL; | |
1422 | YCHAR *name; | |
0e8cc8bd | 1423 | int result = YAFFS_FAIL; |
753ac610 CM |
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 | } | |
4b070809 | 1436 | |
0e8cc8bd WJ |
1437 | yaffsfs_Lock(); |
1438 | ||
753ac610 CM |
1439 | obj = yaffsfs_FindObject(NULL, path, 0, 0, NULL, NULL, NULL); |
1440 | dir = yaffsfs_FindDirectory(NULL, path, &name, 0, ¬Dir, &loop); | |
1441 | ||
1442 | if (!dir && notDir) | |
0e8cc8bd | 1443 | yaffsfs_SetError(-ENOTDIR); |
753ac610 CM |
1444 | else if (loop) |
1445 | yaffsfs_SetError(-ELOOP); | |
1446 | else if (!dir) | |
0e8cc8bd | 1447 | yaffsfs_SetError(-ENOENT); |
753ac610 CM |
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) | |
0e8cc8bd | 1456 | yaffsfs_SetError(-EISDIR); |
753ac610 CM |
1457 | else if (isDirectory && |
1458 | obj->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) | |
0e8cc8bd | 1459 | yaffsfs_SetError(-ENOTDIR); |
753ac610 CM |
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); | |
4b070809 | 1464 | |
753ac610 | 1465 | if (result == YAFFS_FAIL && isDirectory) |
0e8cc8bd | 1466 | yaffsfs_SetError(-ENOTEMPTY); |
0e8cc8bd | 1467 | } |
4b070809 | 1468 | |
0e8cc8bd | 1469 | yaffsfs_Unlock(); |
4b070809 | 1470 | |
0e8cc8bd WJ |
1471 | return (result == YAFFS_FAIL) ? -1 : 0; |
1472 | } | |
0e8cc8bd | 1473 | |
753ac610 | 1474 | int yaffs_unlink(const YCHAR *path) |
0e8cc8bd | 1475 | { |
753ac610 | 1476 | return yaffsfs_DoUnlink(path, 0); |
0e8cc8bd WJ |
1477 | } |
1478 | ||
753ac610 | 1479 | int yaffs_rename(const YCHAR *oldPath, const YCHAR *newPath) |
0e8cc8bd | 1480 | { |
753ac610 CM |
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; | |
4b070809 | 1493 | |
753ac610 | 1494 | YCHAR *alt_newpath = NULL; |
4b070809 | 1495 | |
753ac610 CM |
1496 | if (!oldPath || !newPath) { |
1497 | yaffsfs_SetError(-EFAULT); | |
1498 | return -1; | |
1499 | } | |
4b070809 | 1500 | |
753ac610 CM |
1501 | if (yaffsfs_CheckPath(oldPath) < 0 || yaffsfs_CheckPath(newPath) < 0) { |
1502 | yaffsfs_SetError(-ENAMETOOLONG); | |
1503 | return -1; | |
0e8cc8bd | 1504 | } |
753ac610 CM |
1505 | |
1506 | if (yaffsfs_alt_dir_path(newPath, &alt_newpath) < 0) { | |
1507 | yaffsfs_SetError(-ENOMEM); | |
1508 | return -1; | |
0e8cc8bd | 1509 | } |
753ac610 CM |
1510 | if (alt_newpath) |
1511 | newPath = alt_newpath; | |
4b070809 | 1512 | |
753ac610 | 1513 | yaffsfs_Lock(); |
4b070809 | 1514 | |
753ac610 CM |
1515 | olddir = yaffsfs_FindDirectory(NULL, oldPath, &oldname, 0, |
1516 | ¬OldDir, &oldLoop); | |
1517 | newdir = yaffsfs_FindDirectory(NULL, newPath, &newname, 0, | |
1518 | ¬NewDir, &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; | |
0e8cc8bd WJ |
1567 | xx = xx->parent; |
1568 | } | |
753ac610 CM |
1569 | if (!rename_allowed) |
1570 | yaffsfs_SetError(-EINVAL); | |
0e8cc8bd | 1571 | } |
4b070809 | 1572 | |
753ac610 CM |
1573 | if (rename_allowed) |
1574 | result = yaffs_rename_obj(olddir, oldname, newdir, newname); | |
4b070809 | 1575 | |
0e8cc8bd | 1576 | yaffsfs_Unlock(); |
4b070809 | 1577 | |
753ac610 CM |
1578 | kfree(alt_newpath); |
1579 | ||
4b070809 | 1580 | return (result == YAFFS_FAIL) ? -1 : 0; |
0e8cc8bd WJ |
1581 | } |
1582 | ||
753ac610 | 1583 | static int yaffsfs_DoStat(struct yaffs_obj *obj, struct yaffs_stat *buf) |
0e8cc8bd WJ |
1584 | { |
1585 | int retVal = -1; | |
1586 | ||
753ac610 | 1587 | obj = yaffs_get_equivalent_obj(obj); |
0e8cc8bd | 1588 | |
753ac610 CM |
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; | |
4b070809 | 1593 | |
753ac610 | 1594 | if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) |
0e8cc8bd | 1595 | buf->st_mode |= S_IFDIR; |
753ac610 | 1596 | else if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) |
0e8cc8bd | 1597 | buf->st_mode |= S_IFLNK; |
753ac610 | 1598 | else if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE) |
0e8cc8bd | 1599 | buf->st_mode |= S_IFREG; |
4b070809 | 1600 | |
753ac610 CM |
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; | |
6b44adc2 TR |
1607 | buf->st_blocks = lldiv(buf->st_size + buf->st_blksize - 1, |
1608 | buf->st_blksize); | |
753ac610 CM |
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 | |
0e8cc8bd WJ |
1621 | retVal = 0; |
1622 | } | |
1623 | return retVal; | |
1624 | } | |
1625 | ||
753ac610 CM |
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, ¬Dir, &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) | |
0e8cc8bd | 1678 | { |
753ac610 | 1679 | struct yaffs_obj *obj; |
4b070809 | 1680 | |
0e8cc8bd | 1681 | int retVal = -1; |
4b070809 | 1682 | |
753ac610 CM |
1683 | if (!buf) { |
1684 | yaffsfs_SetError(-EFAULT); | |
1685 | return -1; | |
1686 | } | |
1687 | ||
0e8cc8bd | 1688 | yaffsfs_Lock(); |
753ac610 | 1689 | obj = yaffsfs_HandleToObject(fd); |
4b070809 | 1690 | |
753ac610 CM |
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; | |
0e8cc8bd | 1715 | } |
4b070809 | 1716 | |
753ac610 CM |
1717 | if (!buf) { |
1718 | local.actime = Y_CURRENT_TIME; | |
1719 | local.modtime = local.actime; | |
1720 | buf = &local; | |
0e8cc8bd | 1721 | } |
753ac610 CM |
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; | |
0e8cc8bd | 1750 | } |
4b070809 | 1751 | |
753ac610 CM |
1752 | yaffsfs_Lock(); |
1753 | ||
1754 | obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, ¬Dir, &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 | ||
0e8cc8bd | 1765 | yaffsfs_Unlock(); |
4b070809 | 1766 | |
0e8cc8bd | 1767 | return retVal; |
4b070809 | 1768 | |
753ac610 CM |
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, ¬Dir, &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, ¬Dir, &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, ¬Dir, &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, ¬Dir, &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, ¬Dir, &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, ¬Dir, &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, ¬Dir, &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(); | |
0e8cc8bd | 2411 | |
753ac610 | 2412 | kfree(alt_path); |
0e8cc8bd | 2413 | |
753ac610 | 2414 | return retVal; |
0e8cc8bd WJ |
2415 | } |
2416 | ||
753ac610 | 2417 | int yaffs_rmdir(const YCHAR *path) |
0e8cc8bd | 2418 | { |
753ac610 CM |
2419 | int result; |
2420 | YCHAR *alt_path; | |
4b070809 | 2421 | |
753ac610 CM |
2422 | if (!path) { |
2423 | yaffsfs_SetError(-EFAULT); | |
2424 | return -1; | |
2425 | } | |
4b070809 | 2426 | |
753ac610 CM |
2427 | if (yaffsfs_CheckPath(path) < 0) { |
2428 | yaffsfs_SetError(-ENAMETOOLONG); | |
2429 | return -1; | |
0e8cc8bd | 2430 | } |
753ac610 CM |
2431 | |
2432 | if (yaffsfs_alt_dir_path(path, &alt_path) < 0) { | |
2433 | yaffsfs_SetError(-ENOMEM); | |
2434 | return -1; | |
0e8cc8bd | 2435 | } |
753ac610 CM |
2436 | if (alt_path) |
2437 | path = alt_path; | |
2438 | result = yaffsfs_DoUnlink(path, 1); | |
4b070809 | 2439 | |
753ac610 | 2440 | kfree(alt_path); |
4b070809 | 2441 | |
753ac610 | 2442 | return result; |
0e8cc8bd WJ |
2443 | } |
2444 | ||
753ac610 | 2445 | void *yaffs_getdev(const YCHAR *path) |
0e8cc8bd | 2446 | { |
753ac610 CM |
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; | |
90ef117b | 2456 | int result = YAFFS_FAIL; |
753ac610 | 2457 | struct yaffs_dev *dev = NULL; |
0e8cc8bd | 2458 | |
753ac610 CM |
2459 | if (!path) { |
2460 | yaffsfs_SetError(-EFAULT); | |
2461 | return -1; | |
0e8cc8bd | 2462 | } |
4b070809 | 2463 | |
753ac610 | 2464 | yaffs_trace(YAFFS_TRACE_MOUNT, "yaffs: Mounting %s", path); |
4b070809 | 2465 | |
753ac610 CM |
2466 | if (yaffsfs_CheckPath(path) < 0) { |
2467 | yaffsfs_SetError(-ENAMETOOLONG); | |
2468 | return -1; | |
2469 | } | |
0e8cc8bd | 2470 | |
753ac610 | 2471 | yaffsfs_Lock(); |
0e8cc8bd | 2472 | |
753ac610 | 2473 | yaffsfs_InitHandles(); |
4b070809 | 2474 | |
753ac610 CM |
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 | } | |
4b070809 | 2487 | |
753ac610 CM |
2488 | if (result == YAFFS_FAIL) |
2489 | yaffsfs_SetError(-ENOMEM); | |
2490 | retVal = result ? 0 : -1; | |
4b070809 | 2491 | |
753ac610 CM |
2492 | } else |
2493 | yaffsfs_SetError(-EBUSY); | |
2494 | } else | |
2495 | yaffsfs_SetError(-ENODEV); | |
4b070809 | 2496 | |
0e8cc8bd | 2497 | yaffsfs_Unlock(); |
0e8cc8bd | 2498 | return retVal; |
4b070809 | 2499 | |
0e8cc8bd WJ |
2500 | } |
2501 | ||
753ac610 CM |
2502 | int yaffs_mount2(const YCHAR *path, int readonly) |
2503 | { | |
2504 | return yaffs_mount_common(path, readonly, 0); | |
2505 | } | |
0e8cc8bd | 2506 | |
753ac610 | 2507 | int yaffs_mount(const YCHAR *path) |
0e8cc8bd | 2508 | { |
753ac610 CM |
2509 | return yaffs_mount_common(path, 0, 0); |
2510 | } | |
4b070809 | 2511 | |
753ac610 CM |
2512 | int yaffs_sync(const YCHAR *path) |
2513 | { | |
0e8cc8bd | 2514 | int retVal = -1; |
753ac610 CM |
2515 | struct yaffs_dev *dev = NULL; |
2516 | YCHAR *dummy; | |
4b070809 | 2517 | |
753ac610 CM |
2518 | if (!path) { |
2519 | yaffsfs_SetError(-EFAULT); | |
2520 | return -1; | |
0e8cc8bd | 2521 | } |
753ac610 CM |
2522 | |
2523 | if (yaffsfs_CheckPath(path) < 0) { | |
2524 | yaffsfs_SetError(-ENAMETOOLONG); | |
2525 | return -1; | |
0e8cc8bd | 2526 | } |
4b070809 | 2527 | |
753ac610 CM |
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; | |
4b070809 | 2540 | |
753ac610 CM |
2541 | } |
2542 | } else | |
2543 | yaffsfs_SetError(-ENODEV); | |
2544 | ||
2545 | yaffsfs_Unlock(); | |
0e8cc8bd WJ |
2546 | return retVal; |
2547 | } | |
2548 | ||
753ac610 | 2549 | static int yaffsfs_IsDevBusy(struct yaffs_dev *dev) |
0e8cc8bd | 2550 | { |
753ac610 CM |
2551 | int i; |
2552 | struct yaffs_obj *obj; | |
4b070809 | 2553 | |
753ac610 CM |
2554 | for (i = 0; i < YAFFSFS_N_HANDLES; i++) { |
2555 | obj = yaffsfs_HandleToObject(i); | |
2556 | if (obj && obj->my_dev == dev) | |
2557 | return 1; | |
0e8cc8bd | 2558 | } |
753ac610 | 2559 | return 0; |
0e8cc8bd WJ |
2560 | } |
2561 | ||
753ac610 | 2562 | int yaffs_remount(const YCHAR *path, int force, int read_only) |
0e8cc8bd | 2563 | { |
753ac610 CM |
2564 | int retVal = -1; |
2565 | struct yaffs_dev *dev = NULL; | |
2566 | ||
2567 | if (!path) { | |
2568 | yaffsfs_SetError(-EFAULT); | |
2569 | return -1; | |
2570 | } | |
4b070809 | 2571 | |
753ac610 CM |
2572 | if (yaffsfs_CheckPath(path) < 0) { |
2573 | yaffsfs_SetError(-ENAMETOOLONG); | |
2574 | return -1; | |
2575 | } | |
4b070809 | 2576 | |
0e8cc8bd | 2577 | yaffsfs_Lock(); |
753ac610 CM |
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); | |
4b070809 | 2590 | |
753ac610 CM |
2591 | } else |
2592 | yaffsfs_SetError(-EINVAL); | |
2593 | ||
2594 | } else | |
0e8cc8bd | 2595 | yaffsfs_SetError(-ENODEV); |
753ac610 | 2596 | |
0e8cc8bd WJ |
2597 | yaffsfs_Unlock(); |
2598 | return retVal; | |
4b070809 | 2599 | |
0e8cc8bd WJ |
2600 | } |
2601 | ||
753ac610 | 2602 | int yaffs_unmount2(const YCHAR *path, int force) |
0e8cc8bd | 2603 | { |
753ac610 CM |
2604 | int retVal = -1; |
2605 | struct yaffs_dev *dev = NULL; | |
4b070809 | 2606 | |
753ac610 CM |
2607 | if (!path) { |
2608 | yaffsfs_SetError(-EFAULT); | |
2609 | return -1; | |
2610 | } | |
4b070809 | 2611 | |
753ac610 CM |
2612 | if (yaffsfs_CheckPath(path) < 0) { |
2613 | yaffsfs_SetError(-ENAMETOOLONG); | |
2614 | return -1; | |
2615 | } | |
4b070809 | 2616 | |
753ac610 CM |
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); | |
4b070809 | 2629 | |
0e8cc8bd | 2630 | retVal = 0; |
753ac610 | 2631 | } else |
0e8cc8bd | 2632 | yaffsfs_SetError(-EBUSY); |
4b070809 | 2633 | |
753ac610 | 2634 | } else |
0e8cc8bd | 2635 | yaffsfs_SetError(-EINVAL); |
4b070809 | 2636 | |
753ac610 | 2637 | } else |
0e8cc8bd | 2638 | yaffsfs_SetError(-ENODEV); |
753ac610 | 2639 | |
0e8cc8bd WJ |
2640 | yaffsfs_Unlock(); |
2641 | return retVal; | |
4b070809 | 2642 | |
0e8cc8bd WJ |
2643 | } |
2644 | ||
753ac610 | 2645 | int yaffs_unmount(const YCHAR *path) |
0e8cc8bd | 2646 | { |
753ac610 CM |
2647 | return yaffs_unmount2(path, 0); |
2648 | } | |
4b070809 | 2649 | |
753ac610 CM |
2650 | loff_t yaffs_freespace(const YCHAR *path) |
2651 | { | |
2652 | loff_t retVal = -1; | |
2653 | struct yaffs_dev *dev = NULL; | |
2654 | YCHAR *dummy; | |
4b070809 | 2655 | |
753ac610 CM |
2656 | if (!path) { |
2657 | yaffsfs_SetError(-EFAULT); | |
2658 | return -1; | |
0e8cc8bd | 2659 | } |
753ac610 CM |
2660 | |
2661 | if (yaffsfs_CheckPath(path) < 0) { | |
2662 | yaffsfs_SetError(-ENAMETOOLONG); | |
2663 | return -1; | |
0e8cc8bd | 2664 | } |
4b070809 | 2665 | |
753ac610 CM |
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 | ||
0e8cc8bd | 2675 | yaffsfs_Unlock(); |
4b070809 | 2676 | return retVal; |
0e8cc8bd WJ |
2677 | } |
2678 | ||
753ac610 CM |
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 | } | |
0e8cc8bd | 2689 | |
753ac610 CM |
2690 | if (yaffsfs_CheckPath(path) < 0) { |
2691 | yaffsfs_SetError(-ENAMETOOLONG); | |
2692 | return -1; | |
2693 | } | |
0e8cc8bd | 2694 | |
753ac610 CM |
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); | |
4b070809 | 2705 | |
753ac610 CM |
2706 | yaffsfs_Unlock(); |
2707 | return retVal; | |
2708 | } | |
4b070809 | 2709 | |
753ac610 CM |
2710 | int yaffs_inodecount(const YCHAR *path) |
2711 | { | |
2712 | loff_t retVal = -1; | |
2713 | struct yaffs_dev *dev = NULL; | |
2714 | YCHAR *dummy; | |
4b070809 | 2715 | |
753ac610 CM |
2716 | if (!path) { |
2717 | yaffsfs_SetError(-EFAULT); | |
2718 | return -1; | |
2719 | } | |
4b070809 | 2720 | |
753ac610 CM |
2721 | if (yaffsfs_CheckPath(path) < 0) { |
2722 | yaffsfs_SetError(-ENAMETOOLONG); | |
2723 | return -1; | |
2724 | } | |
4b070809 | 2725 | |
753ac610 CM |
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; | |
0e8cc8bd | 2732 | } |
753ac610 CM |
2733 | |
2734 | if (retVal < 0) | |
2735 | yaffsfs_SetError(-EINVAL); | |
2736 | ||
2737 | yaffsfs_Unlock(); | |
2738 | return retVal; | |
0e8cc8bd WJ |
2739 | } |
2740 | ||
753ac610 CM |
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 | } | |
0e8cc8bd | 2750 | |
753ac610 CM |
2751 | dev->is_mounted = 0; |
2752 | dev->param.remove_obj_fn = yaffsfs_RemoveObjectCallback; | |
0e8cc8bd | 2753 | |
753ac610 CM |
2754 | if (!dev->dev_list.next) |
2755 | INIT_LIST_HEAD(&dev->dev_list); | |
0e8cc8bd | 2756 | |
753ac610 CM |
2757 | list_add(&dev->dev_list, &yaffsfs_deviceList); |
2758 | } | |
0e8cc8bd | 2759 | |
753ac610 | 2760 | void yaffs_remove_device(struct yaffs_dev *dev) |
0e8cc8bd | 2761 | { |
753ac610 CM |
2762 | list_del_init(&dev->dev_list); |
2763 | } | |
0e8cc8bd | 2764 | |
753ac610 | 2765 | /* Functions to iterate through devices. NB Use with extreme care! */ |
0e8cc8bd | 2766 | |
753ac610 CM |
2767 | static struct list_head *dev_iterator; |
2768 | void yaffs_dev_rewind(void) | |
2769 | { | |
2770 | dev_iterator = yaffsfs_deviceList.next; | |
2771 | } | |
0e8cc8bd | 2772 | |
753ac610 CM |
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. */ | |
0e8cc8bd | 2788 | |
753ac610 | 2789 | static struct list_head search_contexts; |
0e8cc8bd | 2790 | |
753ac610 | 2791 | static void yaffsfs_SetDirRewound(struct yaffsfs_DirSearchContxt *dsc) |
0e8cc8bd | 2792 | { |
753ac610 CM |
2793 | if (dsc && |
2794 | dsc->dirObj && | |
2795 | dsc->dirObj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) { | |
4b070809 | 2796 | |
753ac610 | 2797 | dsc->offset = 0; |
4b070809 | 2798 | |
753ac610 CM |
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); | |
0e8cc8bd WJ |
2806 | } else { |
2807 | /* Hey someone isn't playing nice! */ | |
2808 | } | |
2809 | } | |
2810 | ||
753ac610 | 2811 | static void yaffsfs_DirAdvance(struct yaffsfs_DirSearchContxt *dsc) |
0e8cc8bd | 2812 | { |
753ac610 CM |
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 | } | |
0e8cc8bd WJ |
2830 | } else { |
2831 | /* Hey someone isn't playing nice! */ | |
2832 | } | |
2833 | } | |
2834 | ||
753ac610 | 2835 | static void yaffsfs_RemoveObjectCallback(struct yaffs_obj *obj) |
0e8cc8bd WJ |
2836 | { |
2837 | ||
2838 | struct list_head *i; | |
753ac610 | 2839 | struct yaffsfs_DirSearchContxt *dsc; |
4b070809 | 2840 | |
0e8cc8bd | 2841 | /* if search contexts not initilised then skip */ |
753ac610 | 2842 | if (!search_contexts.next) |
0e8cc8bd | 2843 | return; |
4b070809 | 2844 | |
753ac610 | 2845 | /* Iterate through the directory search contexts. |
0e8cc8bd WJ |
2846 | * If any are the one being removed, then advance the dsc to |
2847 | * the next one to prevent a hanging ptr. | |
2848 | */ | |
753ac610 | 2849 | list_for_each(i, &search_contexts) { |
0e8cc8bd | 2850 | if (i) { |
753ac610 CM |
2851 | dsc = list_entry(i, struct yaffsfs_DirSearchContxt, |
2852 | others); | |
2853 | if (dsc->nextReturn == obj) | |
0e8cc8bd WJ |
2854 | yaffsfs_DirAdvance(dsc); |
2855 | } | |
2856 | } | |
4b070809 | 2857 | |
0e8cc8bd WJ |
2858 | } |
2859 | ||
753ac610 | 2860 | yaffs_DIR *yaffs_opendir(const YCHAR *dirname) |
0e8cc8bd WJ |
2861 | { |
2862 | yaffs_DIR *dir = NULL; | |
753ac610 CM |
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 | } | |
4b070809 | 2877 | |
0e8cc8bd | 2878 | yaffsfs_Lock(); |
4b070809 | 2879 | |
753ac610 CM |
2880 | obj = yaffsfs_FindObject(NULL, dirname, 0, 1, NULL, ¬Dir, &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 | } | |
4b070809 | 2897 | |
753ac610 | 2898 | dir = (yaffs_DIR *) dsc; |
4b070809 | 2899 | |
753ac610 CM |
2900 | if (dsc) { |
2901 | memset(dsc, 0, sizeof(struct yaffsfs_DirSearchContxt)); | |
2902 | dsc->inUse = 1; | |
0e8cc8bd | 2903 | dsc->dirObj = obj; |
753ac610 | 2904 | yaffs_strncpy(dsc->name, dirname, NAME_MAX); |
0e8cc8bd | 2905 | INIT_LIST_HEAD(&dsc->others); |
4b070809 | 2906 | |
753ac610 | 2907 | if (!search_contexts.next) |
0e8cc8bd | 2908 | INIT_LIST_HEAD(&search_contexts); |
4b070809 | 2909 | |
753ac610 CM |
2910 | list_add(&dsc->others, &search_contexts); |
2911 | yaffsfs_SetDirRewound(dsc); | |
2912 | } | |
4b070809 | 2913 | |
0e8cc8bd | 2914 | } |
4b070809 | 2915 | |
0e8cc8bd | 2916 | yaffsfs_Unlock(); |
4b070809 | 2917 | |
0e8cc8bd WJ |
2918 | return dir; |
2919 | } | |
2920 | ||
753ac610 | 2921 | struct yaffs_dirent *yaffs_readdir(yaffs_DIR * dirp) |
0e8cc8bd | 2922 | { |
753ac610 | 2923 | struct yaffsfs_DirSearchContxt *dsc; |
0e8cc8bd | 2924 | struct yaffs_dirent *retVal = NULL; |
4b070809 | 2925 | |
753ac610 | 2926 | dsc = (struct yaffsfs_DirSearchContxt *) dirp; |
0e8cc8bd | 2927 | yaffsfs_Lock(); |
4b070809 | 2928 | |
753ac610 | 2929 | if (dsc && dsc->inUse) { |
0e8cc8bd | 2930 | yaffsfs_SetError(0); |
753ac610 CM |
2931 | if (dsc->nextReturn) { |
2932 | dsc->de.d_ino = | |
2933 | yaffs_get_equivalent_obj(dsc->nextReturn)->obj_id; | |
0e8cc8bd WJ |
2934 | dsc->de.d_dont_use = (unsigned)dsc->nextReturn; |
2935 | dsc->de.d_off = dsc->offset++; | |
753ac610 CM |
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")); | |
0e8cc8bd WJ |
2941 | } |
2942 | dsc->de.d_reclen = sizeof(struct yaffs_dirent); | |
2943 | retVal = &dsc->de; | |
2944 | yaffsfs_DirAdvance(dsc); | |
2945 | } else | |
2946 | retVal = NULL; | |
753ac610 | 2947 | } else |
0e8cc8bd | 2948 | yaffsfs_SetError(-EBADF); |
4b070809 | 2949 | |
0e8cc8bd | 2950 | yaffsfs_Unlock(); |
4b070809 | 2951 | |
0e8cc8bd | 2952 | return retVal; |
4b070809 | 2953 | |
0e8cc8bd WJ |
2954 | } |
2955 | ||
0e8cc8bd WJ |
2956 | void yaffs_rewinddir(yaffs_DIR *dirp) |
2957 | { | |
753ac610 CM |
2958 | struct yaffsfs_DirSearchContxt *dsc; |
2959 | ||
2960 | dsc = (struct yaffsfs_DirSearchContxt *) dirp; | |
4b070809 | 2961 | |
0e8cc8bd | 2962 | yaffsfs_Lock(); |
4b070809 | 2963 | |
0e8cc8bd WJ |
2964 | yaffsfs_SetDirRewound(dsc); |
2965 | ||
2966 | yaffsfs_Unlock(); | |
2967 | } | |
2968 | ||
0e8cc8bd WJ |
2969 | int yaffs_closedir(yaffs_DIR *dirp) |
2970 | { | |
753ac610 CM |
2971 | struct yaffsfs_DirSearchContxt *dsc; |
2972 | ||
2973 | dsc = (struct yaffsfs_DirSearchContxt *) dirp; | |
2974 | ||
2975 | if (!dsc) { | |
2976 | yaffsfs_SetError(-EFAULT); | |
2977 | return -1; | |
2978 | } | |
4b070809 | 2979 | |
0e8cc8bd | 2980 | yaffsfs_Lock(); |
753ac610 CM |
2981 | dsc->inUse = 0; |
2982 | list_del(&dsc->others); /* unhook from list */ | |
0e8cc8bd WJ |
2983 | yaffsfs_Unlock(); |
2984 | return 0; | |
2985 | } | |
2986 | ||
753ac610 | 2987 | /* End of directory stuff */ |
0e8cc8bd | 2988 | |
753ac610 | 2989 | int yaffs_symlink(const YCHAR *oldpath, const YCHAR *newpath) |
0e8cc8bd | 2990 | { |
753ac610 CM |
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; | |
4b070809 | 2998 | |
753ac610 CM |
2999 | if (!oldpath || !newpath) { |
3000 | yaffsfs_SetError(-EFAULT); | |
3001 | return -1; | |
0e8cc8bd | 3002 | } |
753ac610 CM |
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, ¬Dir, &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 if (parent) { | |
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); | |
0e8cc8bd | 3030 | } |
4b070809 | 3031 | |
0e8cc8bd | 3032 | yaffsfs_Unlock(); |
4b070809 | 3033 | |
0e8cc8bd | 3034 | return retVal; |
4b070809 | 3035 | |
0e8cc8bd WJ |
3036 | } |
3037 | ||
753ac610 | 3038 | int yaffs_readlink(const YCHAR *path, YCHAR *buf, int bufsiz) |
0e8cc8bd | 3039 | { |
753ac610 CM |
3040 | struct yaffs_obj *obj = NULL; |
3041 | struct yaffs_obj *dir = NULL; | |
3042 | int retVal = -1; | |
3043 | int notDir = 0; | |
3044 | int loop = 0; | |
0e8cc8bd | 3045 | |
753ac610 CM |
3046 | if (!path || !buf) { |
3047 | yaffsfs_SetError(-EFAULT); | |
3048 | return -1; | |
3049 | } | |
4b070809 | 3050 | |
0e8cc8bd | 3051 | yaffsfs_Lock(); |
4b070809 | 3052 | |
753ac610 | 3053 | obj = yaffsfs_FindObject(NULL, path, 0, 1, &dir, ¬Dir, &loop); |
4b070809 | 3054 | |
753ac610 CM |
3055 | if (!dir && notDir) |
3056 | yaffsfs_SetError(-ENOTDIR); | |
3057 | else if (loop) | |
3058 | yaffsfs_SetError(-ELOOP); | |
3059 | else if (!dir || !obj) | |
0e8cc8bd | 3060 | yaffsfs_SetError(-ENOENT); |
753ac610 | 3061 | else if (obj->variant_type != YAFFS_OBJECT_TYPE_SYMLINK) |
0e8cc8bd | 3062 | yaffsfs_SetError(-EINVAL); |
753ac610 CM |
3063 | else { |
3064 | YCHAR *alias = obj->variant.symlink_variant.alias; | |
3065 | memset(buf, 0, bufsiz); | |
3066 | yaffs_strncpy(buf, alias, bufsiz - 1); | |
0e8cc8bd WJ |
3067 | retVal = 0; |
3068 | } | |
3069 | yaffsfs_Unlock(); | |
3070 | return retVal; | |
3071 | } | |
3072 | ||
753ac610 | 3073 | int yaffs_link(const YCHAR *oldpath, const YCHAR *linkpath) |
0e8cc8bd | 3074 | { |
753ac610 CM |
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 | } | |
0e8cc8bd | 3091 | |
753ac610 CM |
3092 | if (yaffsfs_CheckPath(linkpath) < 0 || yaffsfs_CheckPath(oldpath) < 0) { |
3093 | yaffsfs_SetError(-ENAMETOOLONG); | |
3094 | return -1; | |
3095 | } | |
4b070809 | 3096 | |
0e8cc8bd | 3097 | yaffsfs_Lock(); |
4b070809 | 3098 | |
753ac610 CM |
3099 | obj = yaffsfs_FindObject(NULL, oldpath, 0, 1, |
3100 | &obj_dir, ¬DirObj, &objLoop); | |
3101 | lnk = yaffsfs_FindObject(NULL, linkpath, 0, 0, NULL, NULL, NULL); | |
3102 | lnk_dir = yaffsfs_FindDirectory(NULL, linkpath, &newname, | |
3103 | 0, ¬DirLnk, &lnkLoop); | |
4b070809 | 3104 | |
753ac610 CM |
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) | |
0e8cc8bd | 3110 | yaffsfs_SetError(-ENOENT); |
753ac610 CM |
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) | |
0e8cc8bd | 3116 | yaffsfs_SetError(-EEXIST); |
753ac610 CM |
3117 | else if (lnk_dir->my_dev != obj->my_dev) |
3118 | yaffsfs_SetError(-EXDEV); | |
3119 | else { | |
3120 | retVal = yaffsfs_CheckNameLength(newname); | |
4b070809 | 3121 | |
753ac610 CM |
3122 | if (retVal == 0) { |
3123 | lnk = yaffs_link_obj(lnk_dir, newname, obj); | |
3124 | if (lnk) | |
0e8cc8bd | 3125 | retVal = 0; |
753ac610 | 3126 | else { |
0e8cc8bd WJ |
3127 | yaffsfs_SetError(-ENOSPC); |
3128 | retVal = -1; | |
3129 | } | |
0e8cc8bd WJ |
3130 | } |
3131 | } | |
3132 | yaffsfs_Unlock(); | |
4b070809 | 3133 | |
0e8cc8bd WJ |
3134 | return retVal; |
3135 | } | |
3136 | ||
753ac610 CM |
3137 | int yaffs_mknod(const YCHAR *pathname, mode_t mode, dev_t dev) |
3138 | { | |
753ac610 CM |
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 | } | |
0e8cc8bd | 3183 | |
753ac610 | 3184 | int yaffs_dump_dev(const YCHAR *path) |
0e8cc8bd | 3185 | { |
e803fa2c | 3186 | #if 0 |
753ac610 | 3187 | YCHAR *rest; |
4b070809 | 3188 | |
753ac610 | 3189 | struct yaffs_obj *obj = yaffsfs_FindRoot(path, &rest); |
4b070809 | 3190 | |
753ac610 CM |
3191 | if (obj) { |
3192 | struct yaffs_dev *dev = obj->my_dev; | |
4b070809 | 3193 | |
0e8cc8bd | 3194 | printf("\n" |
753ac610 CM |
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); | |
4b070809 | 3207 | |
0e8cc8bd | 3208 | } |
753ac610 | 3209 | #endif |
0e8cc8bd WJ |
3210 | return 0; |
3211 | } |