blob: 1d663870c9bb84301df752f9ad407bf6d4d9c821 [file] [log] [blame]
bigbiff bigbiff9c754052013-01-09 09:09:08 -05001/*
2 node.c (09.10.09)
3 exFAT file system implementation library.
4
bigbiff bigbiff61cdc022013-08-08 08:35:06 -04005 Free exFAT implementation.
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -04006 Copyright (C) 2010-2014 Andrew Nayenko
bigbiff bigbiff9c754052013-01-09 09:09:08 -05007
bigbiff bigbiff61cdc022013-08-08 08:35:06 -04008 This program is free software; you can redistribute it and/or modify
bigbiff bigbiff9c754052013-01-09 09:09:08 -05009 it under the terms of the GNU General Public License as published by
bigbiff bigbiff61cdc022013-08-08 08:35:06 -040010 the Free Software Foundation, either version 2 of the License, or
bigbiff bigbiff9c754052013-01-09 09:09:08 -050011 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
bigbiff bigbiff61cdc022013-08-08 08:35:06 -040018 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
bigbiff bigbiff9c754052013-01-09 09:09:08 -050021*/
22
23#include "exfat.h"
24#include <errno.h>
25#include <string.h>
26#include <inttypes.h>
27
28/* on-disk nodes iterator */
29struct iterator
30{
31 cluster_t cluster;
32 off64_t offset;
33 int contiguous;
34 char* chunk;
35};
36
37struct exfat_node* exfat_get_node(struct exfat_node* node)
38{
39 /* if we switch to multi-threaded mode we will need atomic
40 increment here and atomic decrement in exfat_put_node() */
41 node->references++;
42 return node;
43}
44
45void exfat_put_node(struct exfat* ef, struct exfat_node* node)
46{
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -040047 char buffer[UTF8_BYTES(EXFAT_NAME_MAX) + 1];
bigbiff bigbiff9c754052013-01-09 09:09:08 -050048
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -040049 --node->references;
50 if (node->references < 0)
bigbiff bigbiff9c754052013-01-09 09:09:08 -050051 {
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -040052 exfat_get_name(node, buffer, sizeof(buffer) - 1);
53 exfat_bug("reference counter of '%s' is below zero", buffer);
bigbiff bigbiff9c754052013-01-09 09:09:08 -050054 }
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -040055 else if (node->references == 0 && node != ef->root)
56 {
57 if (node->flags & EXFAT_ATTRIB_DIRTY)
58 {
59 exfat_get_name(node, buffer, sizeof(buffer) - 1);
60 exfat_warn("dirty node '%s' with zero references", buffer);
61 }
62 }
63}
64
65/**
66 * This function must be called on rmdir and unlink (after the last
67 * exfat_put_node()) to free clusters.
68 */
69int exfat_cleanup_node(struct exfat* ef, struct exfat_node* node)
70{
71 int rc = 0;
72
73 if (node->references != 0)
74 exfat_bug("unable to cleanup a node with %d references",
75 node->references);
76
77 if (node->flags & EXFAT_ATTRIB_UNLINKED)
78 {
79 /* free all clusters and node structure itself */
80 rc = exfat_truncate(ef, node, 0, true);
81 /* free the node even in case of error or its memory will be lost */
82 free(node);
83 }
84 return rc;
bigbiff bigbiff9c754052013-01-09 09:09:08 -050085}
86
87/**
88 * Cluster + offset from the beginning of the directory to absolute offset.
89 */
90static off64_t co2o(struct exfat* ef, cluster_t cluster, off64_t offset)
91{
92 return exfat_c2o(ef, cluster) + offset % CLUSTER_SIZE(*ef->sb);
93}
94
95static int opendir(struct exfat* ef, const struct exfat_node* dir,
96 struct iterator* it)
97{
98 if (!(dir->flags & EXFAT_ATTRIB_DIR))
99 exfat_bug("not a directory");
100 it->cluster = dir->start_cluster;
101 it->offset = 0;
102 it->contiguous = IS_CONTIGUOUS(*dir);
103 it->chunk = malloc(CLUSTER_SIZE(*ef->sb));
104 if (it->chunk == NULL)
105 {
106 exfat_error("out of memory");
107 return -ENOMEM;
108 }
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400109 if (exfat_pread(ef->dev, it->chunk, CLUSTER_SIZE(*ef->sb),
110 exfat_c2o(ef, it->cluster)) < 0)
111 {
112 exfat_error("failed to read directory cluster %#x", it->cluster);
113 return -EIO;
114 }
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500115 return 0;
116}
117
118static void closedir(struct iterator* it)
119{
120 it->cluster = 0;
121 it->offset = 0;
122 it->contiguous = 0;
123 free(it->chunk);
124 it->chunk = NULL;
125}
126
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400127static bool fetch_next_entry(struct exfat* ef, const struct exfat_node* parent,
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500128 struct iterator* it)
129{
130 /* move iterator to the next entry in the directory */
131 it->offset += sizeof(struct exfat_entry);
132 /* fetch the next cluster if needed */
133 if ((it->offset & (CLUSTER_SIZE(*ef->sb) - 1)) == 0)
134 {
135 /* reached the end of directory; the caller should check this
136 condition too */
137 if (it->offset >= parent->size)
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400138 return true;
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500139 it->cluster = exfat_next_cluster(ef, parent, it->cluster);
140 if (CLUSTER_INVALID(it->cluster))
141 {
142 exfat_error("invalid cluster 0x%x while reading directory",
143 it->cluster);
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400144 return false;
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500145 }
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400146 if (exfat_pread(ef->dev, it->chunk, CLUSTER_SIZE(*ef->sb),
147 exfat_c2o(ef, it->cluster)) < 0)
148 {
149 exfat_error("failed to read the next directory cluster %#x",
150 it->cluster);
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400151 return false;
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400152 }
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500153 }
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400154 return true;
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500155}
156
157static struct exfat_node* allocate_node(void)
158{
159 struct exfat_node* node = malloc(sizeof(struct exfat_node));
160 if (node == NULL)
161 {
162 exfat_error("failed to allocate node");
163 return NULL;
164 }
165 memset(node, 0, sizeof(struct exfat_node));
166 return node;
167}
168
169static void init_node_meta1(struct exfat_node* node,
170 const struct exfat_entry_meta1* meta1)
171{
172 node->flags = le16_to_cpu(meta1->attrib);
173 node->mtime = exfat_exfat2unix(meta1->mdate, meta1->mtime,
174 meta1->mtime_cs);
175 /* there is no centiseconds field for atime */
176 node->atime = exfat_exfat2unix(meta1->adate, meta1->atime, 0);
177}
178
179static void init_node_meta2(struct exfat_node* node,
180 const struct exfat_entry_meta2* meta2)
181{
182 node->size = le64_to_cpu(meta2->size);
183 node->start_cluster = le32_to_cpu(meta2->start_cluster);
184 node->fptr_cluster = node->start_cluster;
185 if (meta2->flags & EXFAT_FLAG_CONTIGUOUS)
186 node->flags |= EXFAT_ATTRIB_CONTIGUOUS;
187}
188
189static const struct exfat_entry* get_entry_ptr(const struct exfat* ef,
190 const struct iterator* it)
191{
192 return (const struct exfat_entry*)
193 (it->chunk + it->offset % CLUSTER_SIZE(*ef->sb));
194}
195
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400196static bool check_node(const struct exfat_node* node, uint16_t actual_checksum,
197 uint16_t reference_checksum, uint64_t valid_size)
198{
199 char buffer[UTF8_BYTES(EXFAT_NAME_MAX) + 1];
200
201 /*
202 Validate checksum first. If it's invalid all other fields probably
203 contain just garbage.
204 */
205 if (actual_checksum != reference_checksum)
206 {
207 exfat_get_name(node, buffer, sizeof(buffer) - 1);
208 exfat_error("'%s' has invalid checksum (%#hx != %#hx)", buffer,
209 actual_checksum, reference_checksum);
210 return false;
211 }
212
213 /*
214 exFAT does not support sparse files but allows files with uninitialized
215 clusters. For such files valid_size means initialized data size and
216 cannot be greater than file size. See SetFileValidData() function
217 description in MSDN.
218 */
219 if (valid_size > node->size)
220 {
221 exfat_get_name(node, buffer, sizeof(buffer) - 1);
222 exfat_error("'%s' has valid size (%"PRIu64") greater than size "
223 "(%"PRIu64")", buffer, valid_size, node->size);
224 return false;
225 }
226
227 return true;
228}
229
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500230/*
231 * Reads one entry in directory at position pointed by iterator and fills
232 * node structure.
233 */
234static int readdir(struct exfat* ef, const struct exfat_node* parent,
235 struct exfat_node** node, struct iterator* it)
236{
237 int rc = -EIO;
238 const struct exfat_entry* entry;
239 const struct exfat_entry_meta1* meta1;
240 const struct exfat_entry_meta2* meta2;
241 const struct exfat_entry_name* file_name;
242 const struct exfat_entry_upcase* upcase;
243 const struct exfat_entry_bitmap* bitmap;
244 const struct exfat_entry_label* label;
245 uint8_t continuations = 0;
246 le16_t* namep = NULL;
247 uint16_t reference_checksum = 0;
248 uint16_t actual_checksum = 0;
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400249 uint64_t valid_size = 0;
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500250
251 *node = NULL;
252
253 for (;;)
254 {
255 if (it->offset >= parent->size)
256 {
257 if (continuations != 0)
258 {
259 exfat_error("expected %hhu continuations", continuations);
260 goto error;
261 }
262 return -ENOENT; /* that's OK, means end of directory */
263 }
264
265 entry = get_entry_ptr(ef, it);
266 switch (entry->type)
267 {
268 case EXFAT_ENTRY_FILE:
269 if (continuations != 0)
270 {
271 exfat_error("expected %hhu continuations before new entry",
272 continuations);
273 goto error;
274 }
275 meta1 = (const struct exfat_entry_meta1*) entry;
276 continuations = meta1->continuations;
277 /* each file entry must have at least 2 continuations:
278 info and name */
279 if (continuations < 2)
280 {
281 exfat_error("too few continuations (%hhu)", continuations);
282 goto error;
283 }
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400284 if (continuations > 1 +
285 DIV_ROUND_UP(EXFAT_NAME_MAX, EXFAT_ENAME_MAX))
286 {
287 exfat_error("too many continuations (%hhu)", continuations);
288 goto error;
289 }
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500290 reference_checksum = le16_to_cpu(meta1->checksum);
291 actual_checksum = exfat_start_checksum(meta1);
292 *node = allocate_node();
293 if (*node == NULL)
294 {
295 rc = -ENOMEM;
296 goto error;
297 }
298 /* new node has zero reference counter */
299 (*node)->entry_cluster = it->cluster;
300 (*node)->entry_offset = it->offset;
301 init_node_meta1(*node, meta1);
302 namep = (*node)->name;
303 break;
304
305 case EXFAT_ENTRY_FILE_INFO:
306 if (continuations < 2)
307 {
308 exfat_error("unexpected continuation (%hhu)",
309 continuations);
310 goto error;
311 }
312 meta2 = (const struct exfat_entry_meta2*) entry;
313 if (meta2->flags & ~(EXFAT_FLAG_ALWAYS1 | EXFAT_FLAG_CONTIGUOUS))
314 {
315 exfat_error("unknown flags in meta2 (0x%hhx)", meta2->flags);
316 goto error;
317 }
318 init_node_meta2(*node, meta2);
319 actual_checksum = exfat_add_checksum(entry, actual_checksum);
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400320 valid_size = le64_to_cpu(meta2->valid_size);
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500321 /* empty files must be marked as non-contiguous */
322 if ((*node)->size == 0 && (meta2->flags & EXFAT_FLAG_CONTIGUOUS))
323 {
324 exfat_error("empty file marked as contiguous (0x%hhx)",
325 meta2->flags);
326 goto error;
327 }
328 /* directories must be aligned on at cluster boundary */
329 if (((*node)->flags & EXFAT_ATTRIB_DIR) &&
330 (*node)->size % CLUSTER_SIZE(*ef->sb) != 0)
331 {
332 exfat_error("directory has invalid size %"PRIu64" bytes",
333 (*node)->size);
334 goto error;
335 }
336 --continuations;
337 break;
338
339 case EXFAT_ENTRY_FILE_NAME:
340 if (continuations == 0)
341 {
342 exfat_error("unexpected continuation");
343 goto error;
344 }
345 file_name = (const struct exfat_entry_name*) entry;
346 actual_checksum = exfat_add_checksum(entry, actual_checksum);
347
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400348 memcpy(namep, file_name->name,
349 MIN(EXFAT_ENAME_MAX,
350 ((*node)->name + EXFAT_NAME_MAX - namep)) *
351 sizeof(le16_t));
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500352 namep += EXFAT_ENAME_MAX;
353 if (--continuations == 0)
354 {
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400355 if (!check_node(*node, actual_checksum, reference_checksum,
356 valid_size))
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500357 goto error;
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400358 if (!fetch_next_entry(ef, parent, it))
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500359 goto error;
360 return 0; /* entry completed */
361 }
362 break;
363
364 case EXFAT_ENTRY_UPCASE:
365 if (ef->upcase != NULL)
366 break;
367 upcase = (const struct exfat_entry_upcase*) entry;
368 if (CLUSTER_INVALID(le32_to_cpu(upcase->start_cluster)))
369 {
370 exfat_error("invalid cluster 0x%x in upcase table",
371 le32_to_cpu(upcase->start_cluster));
372 goto error;
373 }
374 if (le64_to_cpu(upcase->size) == 0 ||
375 le64_to_cpu(upcase->size) > 0xffff * sizeof(uint16_t) ||
376 le64_to_cpu(upcase->size) % sizeof(uint16_t) != 0)
377 {
378 exfat_error("bad upcase table size (%"PRIu64" bytes)",
379 le64_to_cpu(upcase->size));
380 goto error;
381 }
382 ef->upcase = malloc(le64_to_cpu(upcase->size));
383 if (ef->upcase == NULL)
384 {
385 exfat_error("failed to allocate upcase table (%"PRIu64" bytes)",
386 le64_to_cpu(upcase->size));
387 rc = -ENOMEM;
388 goto error;
389 }
390 ef->upcase_chars = le64_to_cpu(upcase->size) / sizeof(le16_t);
391
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400392 if (exfat_pread(ef->dev, ef->upcase, le64_to_cpu(upcase->size),
393 exfat_c2o(ef, le32_to_cpu(upcase->start_cluster))) < 0)
394 {
395 exfat_error("failed to read upper case table "
396 "(%"PRIu64" bytes starting at cluster %#x)",
397 le64_to_cpu(upcase->size),
398 le32_to_cpu(upcase->start_cluster));
399 goto error;
400 }
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500401 break;
402
403 case EXFAT_ENTRY_BITMAP:
404 bitmap = (const struct exfat_entry_bitmap*) entry;
405 ef->cmap.start_cluster = le32_to_cpu(bitmap->start_cluster);
406 if (CLUSTER_INVALID(ef->cmap.start_cluster))
407 {
408 exfat_error("invalid cluster 0x%x in clusters bitmap",
409 ef->cmap.start_cluster);
410 goto error;
411 }
412 ef->cmap.size = le32_to_cpu(ef->sb->cluster_count) -
413 EXFAT_FIRST_DATA_CLUSTER;
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400414 if (le64_to_cpu(bitmap->size) < DIV_ROUND_UP(ef->cmap.size, 8))
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500415 {
416 exfat_error("invalid clusters bitmap size: %"PRIu64
417 " (expected at least %u)",
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400418 le64_to_cpu(bitmap->size),
419 DIV_ROUND_UP(ef->cmap.size, 8));
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500420 goto error;
421 }
422 /* FIXME bitmap can be rather big, up to 512 MB */
423 ef->cmap.chunk_size = ef->cmap.size;
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400424 ef->cmap.chunk = malloc(BMAP_SIZE(ef->cmap.chunk_size));
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500425 if (ef->cmap.chunk == NULL)
426 {
427 exfat_error("failed to allocate clusters bitmap chunk "
428 "(%"PRIu64" bytes)", le64_to_cpu(bitmap->size));
429 rc = -ENOMEM;
430 goto error;
431 }
432
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400433 if (exfat_pread(ef->dev, ef->cmap.chunk,
434 BMAP_SIZE(ef->cmap.chunk_size),
435 exfat_c2o(ef, ef->cmap.start_cluster)) < 0)
436 {
437 exfat_error("failed to read clusters bitmap "
438 "(%"PRIu64" bytes starting at cluster %#x)",
439 le64_to_cpu(bitmap->size), ef->cmap.start_cluster);
440 goto error;
441 }
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500442 break;
443
444 case EXFAT_ENTRY_LABEL:
445 label = (const struct exfat_entry_label*) entry;
446 if (label->length > EXFAT_ENAME_MAX)
447 {
448 exfat_error("too long label (%hhu chars)", label->length);
449 goto error;
450 }
451 if (utf16_to_utf8(ef->label, label->name,
bigbiff bigbiff004e2df2013-07-03 14:52:12 -0400452 sizeof(ef->label) - 1, EXFAT_ENAME_MAX) != 0)
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500453 goto error;
454 break;
455
456 default:
457 if (entry->type & EXFAT_ENTRY_VALID)
458 {
459 exfat_error("unknown entry type 0x%hhx", entry->type);
460 goto error;
461 }
462 break;
463 }
464
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400465 if (!fetch_next_entry(ef, parent, it))
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500466 goto error;
467 }
468 /* we never reach here */
469
470error:
471 free(*node);
472 *node = NULL;
473 return rc;
474}
475
476int exfat_cache_directory(struct exfat* ef, struct exfat_node* dir)
477{
478 struct iterator it;
479 int rc;
480 struct exfat_node* node;
481 struct exfat_node* current = NULL;
482
483 if (dir->flags & EXFAT_ATTRIB_CACHED)
484 return 0; /* already cached */
485
486 rc = opendir(ef, dir, &it);
487 if (rc != 0)
488 return rc;
489 while ((rc = readdir(ef, dir, &node, &it)) == 0)
490 {
491 node->parent = dir;
492 if (current != NULL)
493 {
494 current->next = node;
495 node->prev = current;
496 }
497 else
498 dir->child = node;
499
500 current = node;
501 }
502 closedir(&it);
503
504 if (rc != -ENOENT)
505 {
506 /* rollback */
507 for (current = dir->child; current; current = node)
508 {
509 node = current->next;
510 free(current);
511 }
512 dir->child = NULL;
513 return rc;
514 }
515
516 dir->flags |= EXFAT_ATTRIB_CACHED;
517 return 0;
518}
519
bigbiff bigbiff998716f2013-03-07 09:59:37 -0500520static void tree_attach(struct exfat_node* dir, struct exfat_node* node)
521{
522 node->parent = dir;
523 if (dir->child)
524 {
525 dir->child->prev = node;
526 node->next = dir->child;
527 }
528 dir->child = node;
529}
530
531static void tree_detach(struct exfat_node* node)
532{
533 if (node->prev)
534 node->prev->next = node->next;
535 else /* this is the first node in the list */
536 node->parent->child = node->next;
537 if (node->next)
538 node->next->prev = node->prev;
539 node->parent = NULL;
540 node->prev = NULL;
541 node->next = NULL;
542}
543
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500544static void reset_cache(struct exfat* ef, struct exfat_node* node)
545{
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400546 char buffer[UTF8_BYTES(EXFAT_NAME_MAX) + 1];
547
bigbiff bigbiff998716f2013-03-07 09:59:37 -0500548 while (node->child)
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500549 {
bigbiff bigbiff998716f2013-03-07 09:59:37 -0500550 struct exfat_node* p = node->child;
551 reset_cache(ef, p);
552 tree_detach(p);
553 free(p);
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500554 }
bigbiff bigbiff998716f2013-03-07 09:59:37 -0500555 node->flags &= ~EXFAT_ATTRIB_CACHED;
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500556 if (node->references != 0)
557 {
bigbiff bigbiff004e2df2013-07-03 14:52:12 -0400558 exfat_get_name(node, buffer, sizeof(buffer) - 1);
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400559 exfat_warn("non-zero reference counter (%d) for '%s'",
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500560 node->references, buffer);
561 }
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400562 if (node != ef->root && (node->flags & EXFAT_ATTRIB_DIRTY))
563 {
564 exfat_get_name(node, buffer, sizeof(buffer) - 1);
565 exfat_bug("node '%s' is dirty", buffer);
566 }
bigbiff bigbiff998716f2013-03-07 09:59:37 -0500567 while (node->references)
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500568 exfat_put_node(ef, node);
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500569}
570
571void exfat_reset_cache(struct exfat* ef)
572{
573 reset_cache(ef, ef->root);
574}
575
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400576static bool next_entry(struct exfat* ef, const struct exfat_node* parent,
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500577 cluster_t* cluster, off64_t* offset)
578{
579 *offset += sizeof(struct exfat_entry);
580 if (*offset % CLUSTER_SIZE(*ef->sb) == 0)
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400581 {
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500582 *cluster = exfat_next_cluster(ef, parent, *cluster);
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400583 if (CLUSTER_INVALID(*cluster))
584 {
585 exfat_error("invalid cluster %#x while getting next entry",
586 *cluster);
587 return false;
588 }
589 }
590 return true;
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500591}
592
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400593int exfat_flush_node(struct exfat* ef, struct exfat_node* node)
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500594{
595 cluster_t cluster;
596 off64_t offset;
597 off64_t meta1_offset, meta2_offset;
598 struct exfat_entry_meta1 meta1;
599 struct exfat_entry_meta2 meta2;
600
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400601 if (!(node->flags & EXFAT_ATTRIB_DIRTY))
602 return 0; /* no need to flush */
603
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500604 if (ef->ro)
605 exfat_bug("unable to flush node to read-only FS");
606
607 if (node->parent == NULL)
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400608 return 0; /* do not flush unlinked node */
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500609
610 cluster = node->entry_cluster;
611 offset = node->entry_offset;
612 meta1_offset = co2o(ef, cluster, offset);
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400613 if (!next_entry(ef, node->parent, &cluster, &offset))
614 return -EIO;
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500615 meta2_offset = co2o(ef, cluster, offset);
616
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400617 if (exfat_pread(ef->dev, &meta1, sizeof(meta1), meta1_offset) < 0)
618 {
619 exfat_error("failed to read meta1 entry on flush");
620 return -EIO;
621 }
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500622 if (meta1.type != EXFAT_ENTRY_FILE)
623 exfat_bug("invalid type of meta1: 0x%hhx", meta1.type);
624 meta1.attrib = cpu_to_le16(node->flags);
625 exfat_unix2exfat(node->mtime, &meta1.mdate, &meta1.mtime, &meta1.mtime_cs);
626 exfat_unix2exfat(node->atime, &meta1.adate, &meta1.atime, NULL);
627
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400628 if (exfat_pread(ef->dev, &meta2, sizeof(meta2), meta2_offset) < 0)
629 {
630 exfat_error("failed to read meta2 entry on flush");
631 return -EIO;
632 }
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500633 if (meta2.type != EXFAT_ENTRY_FILE_INFO)
634 exfat_bug("invalid type of meta2: 0x%hhx", meta2.type);
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400635 meta2.size = meta2.valid_size = cpu_to_le64(node->size);
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500636 meta2.start_cluster = cpu_to_le32(node->start_cluster);
637 meta2.flags = EXFAT_FLAG_ALWAYS1;
638 /* empty files must not be marked as contiguous */
639 if (node->size != 0 && IS_CONTIGUOUS(*node))
640 meta2.flags |= EXFAT_FLAG_CONTIGUOUS;
641 /* name hash remains unchanged, no need to recalculate it */
642
643 meta1.checksum = exfat_calc_checksum(&meta1, &meta2, node->name);
644
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400645 if (exfat_pwrite(ef->dev, &meta1, sizeof(meta1), meta1_offset) < 0)
646 {
647 exfat_error("failed to write meta1 entry on flush");
648 return -EIO;
649 }
650 if (exfat_pwrite(ef->dev, &meta2, sizeof(meta2), meta2_offset) < 0)
651 {
652 exfat_error("failed to write meta2 entry on flush");
653 return -EIO;
654 }
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500655
656 node->flags &= ~EXFAT_ATTRIB_DIRTY;
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400657 return 0;
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500658}
659
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400660static bool erase_entry(struct exfat* ef, struct exfat_node* node)
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500661{
662 cluster_t cluster = node->entry_cluster;
663 off64_t offset = node->entry_offset;
664 int name_entries = DIV_ROUND_UP(utf16_length(node->name), EXFAT_ENAME_MAX);
665 uint8_t entry_type;
666
667 entry_type = EXFAT_ENTRY_FILE & ~EXFAT_ENTRY_VALID;
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400668 if (exfat_pwrite(ef->dev, &entry_type, 1, co2o(ef, cluster, offset)) < 0)
669 {
670 exfat_error("failed to erase meta1 entry");
671 return false;
672 }
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500673
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400674 if (!next_entry(ef, node->parent, &cluster, &offset))
675 return false;
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500676 entry_type = EXFAT_ENTRY_FILE_INFO & ~EXFAT_ENTRY_VALID;
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400677 if (exfat_pwrite(ef->dev, &entry_type, 1, co2o(ef, cluster, offset)) < 0)
678 {
679 exfat_error("failed to erase meta2 entry");
680 return false;
681 }
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500682
683 while (name_entries--)
684 {
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400685 if (!next_entry(ef, node->parent, &cluster, &offset))
686 return false;
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500687 entry_type = EXFAT_ENTRY_FILE_NAME & ~EXFAT_ENTRY_VALID;
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400688 if (exfat_pwrite(ef->dev, &entry_type, 1,
689 co2o(ef, cluster, offset)) < 0)
690 {
691 exfat_error("failed to erase name entry");
692 return false;
693 }
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500694 }
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400695 return true;
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500696}
697
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500698static int shrink_directory(struct exfat* ef, struct exfat_node* dir,
699 off64_t deleted_offset)
700{
701 const struct exfat_node* node;
702 const struct exfat_node* last_node;
703 uint64_t entries = 0;
704 uint64_t new_size;
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500705
706 if (!(dir->flags & EXFAT_ATTRIB_DIR))
707 exfat_bug("attempted to shrink a file");
708 if (!(dir->flags & EXFAT_ATTRIB_CACHED))
709 exfat_bug("attempted to shrink uncached directory");
710
711 for (last_node = node = dir->child; node; node = node->next)
712 {
713 if (deleted_offset < node->entry_offset)
714 {
715 /* there are other entries after the removed one, no way to shrink
716 this directory */
717 return 0;
718 }
719 if (last_node->entry_offset < node->entry_offset)
720 last_node = node;
721 }
722
723 if (last_node)
724 {
725 /* offset of the last entry */
726 entries += last_node->entry_offset / sizeof(struct exfat_entry);
727 /* two subentries with meta info */
728 entries += 2;
729 /* subentries with file name */
730 entries += DIV_ROUND_UP(utf16_length(last_node->name),
731 EXFAT_ENAME_MAX);
732 }
733
734 new_size = DIV_ROUND_UP(entries * sizeof(struct exfat_entry),
735 CLUSTER_SIZE(*ef->sb)) * CLUSTER_SIZE(*ef->sb);
736 if (new_size == 0) /* directory always has at least 1 cluster */
737 new_size = CLUSTER_SIZE(*ef->sb);
738 if (new_size == dir->size)
739 return 0;
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400740 return exfat_truncate(ef, dir, new_size, true);
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500741}
742
743static int delete(struct exfat* ef, struct exfat_node* node)
744{
745 struct exfat_node* parent = node->parent;
746 off64_t deleted_offset = node->entry_offset;
747 int rc;
748
749 exfat_get_node(parent);
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400750 if (!erase_entry(ef, node))
751 {
752 exfat_put_node(ef, parent);
753 return -EIO;
754 }
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500755 exfat_update_mtime(parent);
756 tree_detach(node);
757 rc = shrink_directory(ef, parent, deleted_offset);
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500758 node->flags |= EXFAT_ATTRIB_UNLINKED;
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400759 if (rc != 0)
760 {
761 exfat_flush_node(ef, parent);
762 exfat_put_node(ef, parent);
763 return rc;
764 }
765 rc = exfat_flush_node(ef, parent);
766 exfat_put_node(ef, parent);
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500767 return rc;
768}
769
770int exfat_unlink(struct exfat* ef, struct exfat_node* node)
771{
772 if (node->flags & EXFAT_ATTRIB_DIR)
773 return -EISDIR;
774 return delete(ef, node);
775}
776
777int exfat_rmdir(struct exfat* ef, struct exfat_node* node)
778{
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400779 int rc;
780
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500781 if (!(node->flags & EXFAT_ATTRIB_DIR))
782 return -ENOTDIR;
783 /* check that directory is empty */
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400784 rc = exfat_cache_directory(ef, node);
785 if (rc != 0)
786 return rc;
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500787 if (node->child)
788 return -ENOTEMPTY;
789 return delete(ef, node);
790}
791
792static int grow_directory(struct exfat* ef, struct exfat_node* dir,
793 uint64_t asize, uint32_t difference)
794{
795 return exfat_truncate(ef, dir,
796 DIV_ROUND_UP(asize + difference, CLUSTER_SIZE(*ef->sb))
bigbiff bigbiff998716f2013-03-07 09:59:37 -0500797 * CLUSTER_SIZE(*ef->sb), true);
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500798}
799
800static int find_slot(struct exfat* ef, struct exfat_node* dir,
801 cluster_t* cluster, off64_t* offset, int subentries)
802{
803 struct iterator it;
804 int rc;
805 const struct exfat_entry* entry;
806 int contiguous = 0;
807
808 rc = opendir(ef, dir, &it);
809 if (rc != 0)
810 return rc;
811 for (;;)
812 {
813 if (contiguous == 0)
814 {
815 *cluster = it.cluster;
816 *offset = it.offset;
817 }
818 entry = get_entry_ptr(ef, &it);
819 if (entry->type & EXFAT_ENTRY_VALID)
820 contiguous = 0;
821 else
822 contiguous++;
823 if (contiguous == subentries)
824 break; /* suitable slot is found */
825 if (it.offset + sizeof(struct exfat_entry) >= dir->size)
826 {
827 rc = grow_directory(ef, dir, dir->size,
828 (subentries - contiguous) * sizeof(struct exfat_entry));
829 if (rc != 0)
830 {
831 closedir(&it);
832 return rc;
833 }
834 }
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400835 if (!fetch_next_entry(ef, dir, &it))
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500836 {
837 closedir(&it);
838 return -EIO;
839 }
840 }
841 closedir(&it);
842 return 0;
843}
844
845static int write_entry(struct exfat* ef, struct exfat_node* dir,
846 const le16_t* name, cluster_t cluster, off64_t offset, uint16_t attrib)
847{
848 struct exfat_node* node;
849 struct exfat_entry_meta1 meta1;
850 struct exfat_entry_meta2 meta2;
851 const size_t name_length = utf16_length(name);
852 const int name_entries = DIV_ROUND_UP(name_length, EXFAT_ENAME_MAX);
853 int i;
854
855 node = allocate_node();
856 if (node == NULL)
857 return -ENOMEM;
858 node->entry_cluster = cluster;
859 node->entry_offset = offset;
860 memcpy(node->name, name, name_length * sizeof(le16_t));
861
862 memset(&meta1, 0, sizeof(meta1));
863 meta1.type = EXFAT_ENTRY_FILE;
864 meta1.continuations = 1 + name_entries;
865 meta1.attrib = cpu_to_le16(attrib);
866 exfat_unix2exfat(time(NULL), &meta1.crdate, &meta1.crtime,
867 &meta1.crtime_cs);
868 meta1.adate = meta1.mdate = meta1.crdate;
869 meta1.atime = meta1.mtime = meta1.crtime;
870 meta1.mtime_cs = meta1.crtime_cs; /* there is no atime_cs */
871
872 memset(&meta2, 0, sizeof(meta2));
873 meta2.type = EXFAT_ENTRY_FILE_INFO;
874 meta2.flags = EXFAT_FLAG_ALWAYS1;
875 meta2.name_length = name_length;
876 meta2.name_hash = exfat_calc_name_hash(ef, node->name);
877 meta2.start_cluster = cpu_to_le32(EXFAT_CLUSTER_FREE);
878
879 meta1.checksum = exfat_calc_checksum(&meta1, &meta2, node->name);
880
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400881 if (exfat_pwrite(ef->dev, &meta1, sizeof(meta1),
882 co2o(ef, cluster, offset)) < 0)
883 {
884 exfat_error("failed to write meta1 entry");
885 return -EIO;
886 }
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400887 if (!next_entry(ef, dir, &cluster, &offset))
888 return -EIO;
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400889 if (exfat_pwrite(ef->dev, &meta2, sizeof(meta2),
890 co2o(ef, cluster, offset)) < 0)
891 {
892 exfat_error("failed to write meta2 entry");
893 return -EIO;
894 }
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500895 for (i = 0; i < name_entries; i++)
896 {
897 struct exfat_entry_name name_entry = {EXFAT_ENTRY_FILE_NAME, 0};
898 memcpy(name_entry.name, node->name + i * EXFAT_ENAME_MAX,
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400899 MIN(EXFAT_ENAME_MAX, EXFAT_NAME_MAX - i * EXFAT_ENAME_MAX) *
900 sizeof(le16_t));
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400901 if (!next_entry(ef, dir, &cluster, &offset))
902 return -EIO;
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400903 if (exfat_pwrite(ef->dev, &name_entry, sizeof(name_entry),
904 co2o(ef, cluster, offset)) < 0)
905 {
906 exfat_error("failed to write name entry");
907 return -EIO;
908 }
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500909 }
910
911 init_node_meta1(node, &meta1);
912 init_node_meta2(node, &meta2);
913
914 tree_attach(dir, node);
915 exfat_update_mtime(dir);
916 return 0;
917}
918
919static int create(struct exfat* ef, const char* path, uint16_t attrib)
920{
921 struct exfat_node* dir;
922 struct exfat_node* existing;
923 cluster_t cluster = EXFAT_CLUSTER_BAD;
924 off64_t offset = -1;
925 le16_t name[EXFAT_NAME_MAX + 1];
926 int rc;
927
928 rc = exfat_split(ef, &dir, &existing, name, path);
929 if (rc != 0)
930 return rc;
931 if (existing != NULL)
932 {
933 exfat_put_node(ef, existing);
934 exfat_put_node(ef, dir);
935 return -EEXIST;
936 }
937
938 rc = find_slot(ef, dir, &cluster, &offset,
939 2 + DIV_ROUND_UP(utf16_length(name), EXFAT_ENAME_MAX));
940 if (rc != 0)
941 {
942 exfat_put_node(ef, dir);
943 return rc;
944 }
945 rc = write_entry(ef, dir, name, cluster, offset, attrib);
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400946 if (rc != 0)
947 {
948 exfat_put_node(ef, dir);
949 return rc;
950 }
951 rc = exfat_flush_node(ef, dir);
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500952 exfat_put_node(ef, dir);
953 return rc;
954}
955
956int exfat_mknod(struct exfat* ef, const char* path)
957{
958 return create(ef, path, EXFAT_ATTRIB_ARCH);
959}
960
961int exfat_mkdir(struct exfat* ef, const char* path)
962{
963 int rc;
964 struct exfat_node* node;
965
966 rc = create(ef, path, EXFAT_ATTRIB_ARCH | EXFAT_ATTRIB_DIR);
967 if (rc != 0)
968 return rc;
969 rc = exfat_lookup(ef, &node, path);
970 if (rc != 0)
971 return 0;
972 /* directories always have at least one cluster */
bigbiff bigbiff998716f2013-03-07 09:59:37 -0500973 rc = exfat_truncate(ef, node, CLUSTER_SIZE(*ef->sb), true);
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500974 if (rc != 0)
975 {
976 delete(ef, node);
977 exfat_put_node(ef, node);
978 return rc;
979 }
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -0400980 rc = exfat_flush_node(ef, node);
981 if (rc != 0)
982 {
983 delete(ef, node);
984 exfat_put_node(ef, node);
985 return rc;
986 }
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500987 exfat_put_node(ef, node);
988 return 0;
989}
990
bigbiff bigbiff61cdc022013-08-08 08:35:06 -0400991static int rename_entry(struct exfat* ef, struct exfat_node* dir,
bigbiff bigbiff9c754052013-01-09 09:09:08 -0500992 struct exfat_node* node, const le16_t* name, cluster_t new_cluster,
993 off64_t new_offset)
994{
995 struct exfat_entry_meta1 meta1;
996 struct exfat_entry_meta2 meta2;
997 cluster_t old_cluster = node->entry_cluster;
998 off64_t old_offset = node->entry_offset;
999 const size_t name_length = utf16_length(name);
1000 const int name_entries = DIV_ROUND_UP(name_length, EXFAT_ENAME_MAX);
1001 int i;
1002
bigbiff bigbiff61cdc022013-08-08 08:35:06 -04001003 if (exfat_pread(ef->dev, &meta1, sizeof(meta1),
1004 co2o(ef, old_cluster, old_offset)) < 0)
1005 {
1006 exfat_error("failed to read meta1 entry on rename");
1007 return -EIO;
1008 }
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -04001009 if (!next_entry(ef, node->parent, &old_cluster, &old_offset))
1010 return -EIO;
bigbiff bigbiff61cdc022013-08-08 08:35:06 -04001011 if (exfat_pread(ef->dev, &meta2, sizeof(meta2),
1012 co2o(ef, old_cluster, old_offset)) < 0)
1013 {
1014 exfat_error("failed to read meta2 entry on rename");
1015 return -EIO;
1016 }
bigbiff bigbiff9c754052013-01-09 09:09:08 -05001017 meta1.continuations = 1 + name_entries;
1018 meta2.name_hash = exfat_calc_name_hash(ef, name);
1019 meta2.name_length = name_length;
1020 meta1.checksum = exfat_calc_checksum(&meta1, &meta2, name);
1021
bigbiff bigbiff61cdc022013-08-08 08:35:06 -04001022 if (!erase_entry(ef, node))
1023 return -EIO;
bigbiff bigbiff9c754052013-01-09 09:09:08 -05001024
1025 node->entry_cluster = new_cluster;
1026 node->entry_offset = new_offset;
1027
bigbiff bigbiff61cdc022013-08-08 08:35:06 -04001028 if (exfat_pwrite(ef->dev, &meta1, sizeof(meta1),
1029 co2o(ef, new_cluster, new_offset)) < 0)
1030 {
1031 exfat_error("failed to write meta1 entry on rename");
1032 return -EIO;
1033 }
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -04001034 if (!next_entry(ef, dir, &new_cluster, &new_offset))
1035 return -EIO;
bigbiff bigbiff61cdc022013-08-08 08:35:06 -04001036 if (exfat_pwrite(ef->dev, &meta2, sizeof(meta2),
1037 co2o(ef, new_cluster, new_offset)) < 0)
1038 {
1039 exfat_error("failed to write meta2 entry on rename");
1040 return -EIO;
1041 }
bigbiff bigbiff9c754052013-01-09 09:09:08 -05001042
1043 for (i = 0; i < name_entries; i++)
1044 {
1045 struct exfat_entry_name name_entry = {EXFAT_ENTRY_FILE_NAME, 0};
1046 memcpy(name_entry.name, name + i * EXFAT_ENAME_MAX,
1047 EXFAT_ENAME_MAX * sizeof(le16_t));
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -04001048 if (!next_entry(ef, dir, &new_cluster, &new_offset))
1049 return -EIO;
bigbiff bigbiff61cdc022013-08-08 08:35:06 -04001050 if (exfat_pwrite(ef->dev, &name_entry, sizeof(name_entry),
1051 co2o(ef, new_cluster, new_offset)) < 0)
1052 {
1053 exfat_error("failed to write name entry on rename");
1054 return -EIO;
1055 }
bigbiff bigbiff9c754052013-01-09 09:09:08 -05001056 }
1057
1058 memcpy(node->name, name, (EXFAT_NAME_MAX + 1) * sizeof(le16_t));
1059 tree_detach(node);
1060 tree_attach(dir, node);
bigbiff bigbiff61cdc022013-08-08 08:35:06 -04001061 return 0;
bigbiff bigbiff9c754052013-01-09 09:09:08 -05001062}
1063
1064int exfat_rename(struct exfat* ef, const char* old_path, const char* new_path)
1065{
1066 struct exfat_node* node;
1067 struct exfat_node* existing;
1068 struct exfat_node* dir;
1069 cluster_t cluster = EXFAT_CLUSTER_BAD;
1070 off64_t offset = -1;
1071 le16_t name[EXFAT_NAME_MAX + 1];
1072 int rc;
1073
1074 rc = exfat_lookup(ef, &node, old_path);
1075 if (rc != 0)
1076 return rc;
1077
1078 rc = exfat_split(ef, &dir, &existing, name, new_path);
1079 if (rc != 0)
1080 {
1081 exfat_put_node(ef, node);
1082 return rc;
1083 }
bigbiff bigbiffca829c42013-01-28 08:14:25 -05001084
1085 /* check that target is not a subdirectory of the source */
1086 if (node->flags & EXFAT_ATTRIB_DIR)
1087 {
1088 struct exfat_node* p;
1089
1090 for (p = dir; p; p = p->parent)
1091 if (node == p)
1092 {
1093 if (existing != NULL)
1094 exfat_put_node(ef, existing);
1095 exfat_put_node(ef, dir);
1096 exfat_put_node(ef, node);
1097 return -EINVAL;
1098 }
1099 }
1100
bigbiff bigbiff9c754052013-01-09 09:09:08 -05001101 if (existing != NULL)
1102 {
1103 /* remove target if it's not the same node as source */
1104 if (existing != node)
1105 {
1106 if (existing->flags & EXFAT_ATTRIB_DIR)
1107 {
1108 if (node->flags & EXFAT_ATTRIB_DIR)
1109 rc = exfat_rmdir(ef, existing);
1110 else
1111 rc = -ENOTDIR;
1112 }
1113 else
1114 {
1115 if (!(node->flags & EXFAT_ATTRIB_DIR))
1116 rc = exfat_unlink(ef, existing);
1117 else
1118 rc = -EISDIR;
1119 }
1120 exfat_put_node(ef, existing);
1121 if (rc != 0)
1122 {
1123 exfat_put_node(ef, dir);
1124 exfat_put_node(ef, node);
1125 return rc;
1126 }
1127 }
1128 else
1129 exfat_put_node(ef, existing);
1130 }
1131
1132 rc = find_slot(ef, dir, &cluster, &offset,
1133 2 + DIV_ROUND_UP(utf16_length(name), EXFAT_ENAME_MAX));
1134 if (rc != 0)
1135 {
1136 exfat_put_node(ef, dir);
1137 exfat_put_node(ef, node);
1138 return rc;
1139 }
bigbiff bigbiff61cdc022013-08-08 08:35:06 -04001140 rc = rename_entry(ef, dir, node, name, cluster, offset);
bigbiff bigbiff9c754052013-01-09 09:09:08 -05001141 exfat_put_node(ef, dir);
1142 exfat_put_node(ef, node);
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -04001143 return rc;
bigbiff bigbiff9c754052013-01-09 09:09:08 -05001144}
1145
1146void exfat_utimes(struct exfat_node* node, const struct timespec tv[2])
1147{
1148 node->atime = tv[0].tv_sec;
1149 node->mtime = tv[1].tv_sec;
1150 node->flags |= EXFAT_ATTRIB_DIRTY;
1151}
1152
1153void exfat_update_atime(struct exfat_node* node)
1154{
1155 node->atime = time(NULL);
1156 node->flags |= EXFAT_ATTRIB_DIRTY;
1157}
1158
1159void exfat_update_mtime(struct exfat_node* node)
1160{
1161 node->mtime = time(NULL);
1162 node->flags |= EXFAT_ATTRIB_DIRTY;
1163}
1164
1165const char* exfat_get_label(struct exfat* ef)
1166{
1167 return ef->label;
1168}
1169
1170static int find_label(struct exfat* ef, cluster_t* cluster, off64_t* offset)
1171{
1172 struct iterator it;
1173 int rc;
1174
1175 rc = opendir(ef, ef->root, &it);
1176 if (rc != 0)
1177 return rc;
1178
1179 for (;;)
1180 {
1181 if (it.offset >= ef->root->size)
1182 {
1183 closedir(&it);
1184 return -ENOENT;
1185 }
1186
1187 if (get_entry_ptr(ef, &it)->type == EXFAT_ENTRY_LABEL)
1188 {
1189 *cluster = it.cluster;
1190 *offset = it.offset;
1191 closedir(&it);
1192 return 0;
1193 }
1194
bigbiff bigbiff2e33c5e2014-09-04 20:58:41 -04001195 if (!fetch_next_entry(ef, ef->root, &it))
bigbiff bigbiff9c754052013-01-09 09:09:08 -05001196 {
1197 closedir(&it);
1198 return -EIO;
1199 }
1200 }
1201}
1202
1203int exfat_set_label(struct exfat* ef, const char* label)
1204{
1205 le16_t label_utf16[EXFAT_ENAME_MAX + 1];
1206 int rc;
1207 cluster_t cluster;
1208 off64_t offset;
1209 struct exfat_entry_label entry;
1210
1211 memset(label_utf16, 0, sizeof(label_utf16));
1212 rc = utf8_to_utf16(label_utf16, label, EXFAT_ENAME_MAX, strlen(label));
1213 if (rc != 0)
1214 return rc;
1215
1216 rc = find_label(ef, &cluster, &offset);
1217 if (rc == -ENOENT)
1218 rc = find_slot(ef, ef->root, &cluster, &offset, 1);
1219 if (rc != 0)
1220 return rc;
1221
1222 entry.type = EXFAT_ENTRY_LABEL;
1223 entry.length = utf16_length(label_utf16);
1224 memcpy(entry.name, label_utf16, sizeof(entry.name));
1225 if (entry.length == 0)
1226 entry.type ^= EXFAT_ENTRY_VALID;
1227
bigbiff bigbiff61cdc022013-08-08 08:35:06 -04001228 if (exfat_pwrite(ef->dev, &entry, sizeof(struct exfat_entry_label),
1229 co2o(ef, cluster, offset)) < 0)
1230 {
1231 exfat_error("failed to write label entry");
1232 return -EIO;
1233 }
bigbiff bigbiff004e2df2013-07-03 14:52:12 -04001234 strcpy(ef->label, label);
bigbiff bigbiff9c754052013-01-09 09:09:08 -05001235 return 0;
1236}