3 exFAT file system implementation library.
5 Free exFAT implementation.
6 Copyright (C) 2010-2017 Andrew Nayenko
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 2 of the License, or
11 (at your option) any later version.
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.
18 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.
28 #define EXFAT_ENTRY_NONE (-1)
30 struct exfat_node* exfat_get_node(struct exfat_node* node)
32 /* if we switch to multi-threaded mode we will need atomic
33 increment here and atomic decrement in exfat_put_node() */
38 void exfat_put_node(struct exfat* ef, struct exfat_node* node)
40 char buffer[EXFAT_UTF8_NAME_BUFFER_MAX];
43 if (node->references < 0)
45 exfat_get_name(node, buffer);
46 exfat_bug("reference counter of '%s' is below zero", buffer);
48 else if (node->references == 0 && node != ef->root)
52 exfat_get_name(node, buffer);
53 exfat_warn("dirty node '%s' with zero references", buffer);
59 * This function must be called on rmdir and unlink (after the last
60 * exfat_put_node()) to free clusters.
62 int exfat_cleanup_node(struct exfat* ef, struct exfat_node* node)
66 if (node->references != 0)
67 exfat_bug("unable to cleanup a node with %d references",
70 if (node->is_unlinked)
72 /* free all clusters and node structure itself */
73 rc = exfat_truncate(ef, node, 0, true);
74 /* free the node even in case of error or its memory will be lost */
80 static int read_entries(struct exfat* ef, struct exfat_node* dir,
81 struct exfat_entry* entries, int n, off_t offset)
85 if (!(dir->attrib & EXFAT_ATTRIB_DIR))
86 exfat_bug("attempted to read entries from a file");
88 size = exfat_generic_pread(ef, dir, entries,
89 sizeof(struct exfat_entry[n]), offset);
90 if (size == sizeof(struct exfat_entry[n]))
91 return 0; /* success */
96 exfat_error("read %zd bytes instead of %zu bytes", size,
97 sizeof(struct exfat_entry[n]));
101 static int write_entries(struct exfat* ef, struct exfat_node* dir,
102 const struct exfat_entry* entries, int n, off_t offset)
106 if (!(dir->attrib & EXFAT_ATTRIB_DIR))
107 exfat_bug("attempted to write entries into a file");
109 size = exfat_generic_pwrite(ef, dir, entries,
110 sizeof(struct exfat_entry[n]), offset);
111 if (size == sizeof(struct exfat_entry[n]))
112 return 0; /* success */
115 exfat_error("wrote %zd bytes instead of %zu bytes", size,
116 sizeof(struct exfat_entry[n]));
120 static struct exfat_node* allocate_node(void)
122 struct exfat_node* node = malloc(sizeof(struct exfat_node));
125 exfat_error("failed to allocate node");
128 memset(node, 0, sizeof(struct exfat_node));
132 static void init_node_meta1(struct exfat_node* node,
133 const struct exfat_entry_meta1* meta1)
135 node->attrib = le16_to_cpu(meta1->attrib);
136 node->continuations = meta1->continuations;
137 node->mtime = exfat_exfat2unix(meta1->mdate, meta1->mtime,
139 /* there is no centiseconds field for atime */
140 node->atime = exfat_exfat2unix(meta1->adate, meta1->atime, 0);
143 static void init_node_meta2(struct exfat_node* node,
144 const struct exfat_entry_meta2* meta2)
146 node->size = le64_to_cpu(meta2->size);
147 node->start_cluster = le32_to_cpu(meta2->start_cluster);
148 node->fptr_cluster = node->start_cluster;
149 node->is_contiguous = ((meta2->flags & EXFAT_FLAG_CONTIGUOUS) != 0);
152 static void init_node_name(struct exfat_node* node,
153 const struct exfat_entry* entries, int n)
157 for (i = 0; i < n; i++)
158 memcpy(node->name + i * EXFAT_ENAME_MAX,
159 ((const struct exfat_entry_name*) &entries[i])->name,
160 EXFAT_ENAME_MAX * sizeof(le16_t));
163 static bool check_entries(const struct exfat_entry* entry, int n)
165 int previous = EXFAT_ENTRY_NONE;
169 /* check transitions between entries types */
170 for (i = 0; i < n + 1; previous = current, i++)
174 current = (i < n) ? entry[i].type : EXFAT_ENTRY_NONE;
177 case EXFAT_ENTRY_NONE:
178 valid = (current == EXFAT_ENTRY_FILE);
180 case EXFAT_ENTRY_FILE:
181 valid = (current == EXFAT_ENTRY_FILE_INFO);
183 case EXFAT_ENTRY_FILE_INFO:
184 valid = (current == EXFAT_ENTRY_FILE_NAME);
186 case EXFAT_ENTRY_FILE_NAME:
187 valid = (current == EXFAT_ENTRY_FILE_NAME ||
188 current == EXFAT_ENTRY_NONE ||
189 current >= EXFAT_ENTRY_FILE_TAIL);
191 case EXFAT_ENTRY_FILE_TAIL ... 0xff:
192 valid = (current >= EXFAT_ENTRY_FILE_TAIL ||
193 current == EXFAT_ENTRY_NONE);
199 exfat_error("unexpected entry type %#x after %#x at %d/%d",
200 current, previous, i, n);
207 static bool check_node(const struct exfat* ef, struct exfat_node* node,
208 le16_t actual_checksum, const struct exfat_entry_meta1* meta1,
209 const struct exfat_entry_meta2* meta2)
211 int cluster_size = CLUSTER_SIZE(*ef->sb);
212 uint64_t clusters_heap_size =
213 (uint64_t) le32_to_cpu(ef->sb->cluster_count) * cluster_size;
214 char buffer[EXFAT_UTF8_NAME_BUFFER_MAX];
218 Validate checksum first. If it's invalid all other fields probably
219 contain just garbage.
221 if (le16_to_cpu(actual_checksum) != le16_to_cpu(meta1->checksum))
223 exfat_get_name(node, buffer);
224 exfat_error("'%s' has invalid checksum (%#hx != %#hx)", buffer,
225 le16_to_cpu(actual_checksum), le16_to_cpu(meta1->checksum));
230 exFAT does not support sparse files but allows files with uninitialized
231 clusters. For such files valid_size means initialized data size and
232 cannot be greater than file size. See SetFileValidData() function
235 if (le64_to_cpu(meta2->valid_size) > node->size)
237 exfat_get_name(node, buffer);
238 exfat_error("'%s' has valid size (%"PRIu64") greater than size "
239 "(%"PRIu64")", buffer, le64_to_cpu(meta2->valid_size),
245 Empty file must have zero start cluster. Non-empty file must start
246 with a valid cluster. Directories cannot be empty (i.e. must always
247 have a valid start cluster), but we will check this later while
248 reading that directory to give user a chance to read this directory.
250 if (node->size == 0 && node->start_cluster != EXFAT_CLUSTER_FREE)
252 exfat_get_name(node, buffer);
253 exfat_error("'%s' is empty but start cluster is %#x", buffer,
254 node->start_cluster);
257 if (node->size > 0 && CLUSTER_INVALID(*ef->sb, node->start_cluster))
259 exfat_get_name(node, buffer);
260 exfat_error("'%s' points to invalid cluster %#x", buffer,
261 node->start_cluster);
265 /* File or directory cannot be larger than clusters heap. */
266 if (node->size > clusters_heap_size)
268 exfat_get_name(node, buffer);
269 exfat_error("'%s' is larger than clusters heap: %"PRIu64" > %"PRIu64,
270 buffer, node->size, clusters_heap_size);
274 /* Empty file or directory must be marked as non-contiguous. */
275 if (node->size == 0 && node->is_contiguous)
277 exfat_get_name(node, buffer);
278 exfat_error("'%s' is empty but marked as contiguous (%#hx)", buffer,
283 /* Directory size must be aligned on at cluster boundary. */
284 if ((node->attrib & EXFAT_ATTRIB_DIR) && node->size % cluster_size != 0)
286 exfat_get_name(node, buffer);
287 exfat_error("'%s' directory size %"PRIu64" is not divisible by %d", buffer,
288 node->size, cluster_size);
295 static int parse_file_entries(struct exfat* ef, struct exfat_node* node,
296 const struct exfat_entry* entries, int n)
298 const struct exfat_entry_meta1* meta1;
299 const struct exfat_entry_meta2* meta2;
300 int mandatory_entries;
302 if (!check_entries(entries, n))
305 meta1 = (const struct exfat_entry_meta1*) &entries[0];
306 if (meta1->continuations < 2)
308 exfat_error("too few continuations (%hhu)", meta1->continuations);
311 meta2 = (const struct exfat_entry_meta2*) &entries[1];
312 if (meta2->flags & ~(EXFAT_FLAG_ALWAYS1 | EXFAT_FLAG_CONTIGUOUS))
314 exfat_error("unknown flags in meta2 (%#hhx)", meta2->flags);
317 mandatory_entries = 2 + DIV_ROUND_UP(meta2->name_length, EXFAT_ENAME_MAX);
318 if (meta1->continuations < mandatory_entries - 1)
320 exfat_error("too few continuations (%hhu < %d)",
321 meta1->continuations, mandatory_entries - 1);
325 init_node_meta1(node, meta1);
326 init_node_meta2(node, meta2);
327 init_node_name(node, entries + 2, mandatory_entries - 2);
329 if (!check_node(ef, node, exfat_calc_checksum(entries, n), meta1, meta2))
335 static int parse_file_entry(struct exfat* ef, struct exfat_node* parent,
336 struct exfat_node** node, off_t* offset, int n)
338 struct exfat_entry entries[n];
341 rc = read_entries(ef, parent, entries, n, *offset);
345 /* a new node has zero references */
346 *node = allocate_node();
349 (*node)->entry_offset = *offset;
351 rc = parse_file_entries(ef, *node, entries, n);
358 *offset += sizeof(struct exfat_entry[n]);
362 static void decompress_upcase(uint16_t* output, const le16_t* source,
368 for (oi = 0; oi < EXFAT_UPCASE_CHARS; oi++)
371 for (si = 0, oi = 0; si < size && oi < EXFAT_UPCASE_CHARS; si++)
373 uint16_t ch = le16_to_cpu(source[si]);
375 if (ch == 0xffff && si + 1 < size) /* indicates a run */
376 oi += le16_to_cpu(source[++si]);
383 * Read one entry in a directory at offset position and build a new node
386 static int readdir(struct exfat* ef, struct exfat_node* parent,
387 struct exfat_node** node, off_t* offset)
390 struct exfat_entry entry;
391 const struct exfat_entry_meta1* meta1;
392 const struct exfat_entry_upcase* upcase;
393 const struct exfat_entry_bitmap* bitmap;
394 const struct exfat_entry_label* label;
395 uint64_t upcase_size = 0;
396 le16_t* upcase_comp = NULL;
400 rc = read_entries(ef, parent, &entry, 1, *offset);
406 case EXFAT_ENTRY_FILE:
407 meta1 = (const struct exfat_entry_meta1*) &entry;
408 return parse_file_entry(ef, parent, node, offset,
409 1 + meta1->continuations);
411 case EXFAT_ENTRY_UPCASE:
412 if (ef->upcase != NULL)
414 upcase = (const struct exfat_entry_upcase*) &entry;
415 if (CLUSTER_INVALID(*ef->sb, le32_to_cpu(upcase->start_cluster)))
417 exfat_error("invalid cluster 0x%x in upcase table",
418 le32_to_cpu(upcase->start_cluster));
421 upcase_size = le64_to_cpu(upcase->size);
422 if (upcase_size == 0 ||
423 upcase_size > EXFAT_UPCASE_CHARS * sizeof(uint16_t) ||
424 upcase_size % sizeof(uint16_t) != 0)
426 exfat_error("bad upcase table size (%"PRIu64" bytes)",
430 upcase_comp = malloc(upcase_size);
431 if (upcase_comp == NULL)
433 exfat_error("failed to allocate upcase table (%"PRIu64" bytes)",
438 /* read compressed upcase table */
439 if (exfat_pread(ef->dev, upcase_comp, upcase_size,
440 exfat_c2o(ef, le32_to_cpu(upcase->start_cluster))) < 0)
443 exfat_error("failed to read upper case table "
444 "(%"PRIu64" bytes starting at cluster %#x)",
446 le32_to_cpu(upcase->start_cluster));
450 /* decompress upcase table */
451 ef->upcase = calloc(EXFAT_UPCASE_CHARS, sizeof(uint16_t));
452 if (ef->upcase == NULL)
455 exfat_error("failed to allocate decompressed upcase table");
458 decompress_upcase(ef->upcase, upcase_comp,
459 upcase_size / sizeof(uint16_t));
463 case EXFAT_ENTRY_BITMAP:
464 bitmap = (const struct exfat_entry_bitmap*) &entry;
465 ef->cmap.start_cluster = le32_to_cpu(bitmap->start_cluster);
466 if (CLUSTER_INVALID(*ef->sb, ef->cmap.start_cluster))
468 exfat_error("invalid cluster 0x%x in clusters bitmap",
469 ef->cmap.start_cluster);
472 ef->cmap.size = le32_to_cpu(ef->sb->cluster_count);
473 if (le64_to_cpu(bitmap->size) < DIV_ROUND_UP(ef->cmap.size, 8))
475 exfat_error("invalid clusters bitmap size: %"PRIu64
476 " (expected at least %u)",
477 le64_to_cpu(bitmap->size),
478 DIV_ROUND_UP(ef->cmap.size, 8));
481 /* FIXME bitmap can be rather big, up to 512 MB */
482 ef->cmap.chunk_size = ef->cmap.size;
483 ef->cmap.chunk = malloc(BMAP_SIZE(ef->cmap.chunk_size));
484 if (ef->cmap.chunk == NULL)
486 exfat_error("failed to allocate clusters bitmap chunk "
487 "(%"PRIu64" bytes)", le64_to_cpu(bitmap->size));
491 if (exfat_pread(ef->dev, ef->cmap.chunk,
492 BMAP_SIZE(ef->cmap.chunk_size),
493 exfat_c2o(ef, ef->cmap.start_cluster)) < 0)
495 exfat_error("failed to read clusters bitmap "
496 "(%"PRIu64" bytes starting at cluster %#x)",
497 le64_to_cpu(bitmap->size), ef->cmap.start_cluster);
502 case EXFAT_ENTRY_LABEL:
503 label = (const struct exfat_entry_label*) &entry;
504 if (label->length > EXFAT_ENAME_MAX)
506 exfat_error("too long label (%hhu chars)", label->length);
509 if (utf16_to_utf8(ef->label, label->name,
510 sizeof(ef->label), EXFAT_ENAME_MAX) != 0)
515 if (!(entry.type & EXFAT_ENTRY_VALID))
516 break; /* deleted entry, ignore it */
518 exfat_error("unknown entry type %#hhx", entry.type);
521 *offset += sizeof(entry);
523 /* we never reach here */
526 int exfat_cache_directory(struct exfat* ef, struct exfat_node* dir)
530 struct exfat_node* node;
531 struct exfat_node* current = NULL;
534 return 0; /* already cached */
536 while ((rc = readdir(ef, dir, &node, &offset)) == 0)
541 current->next = node;
542 node->prev = current;
553 for (current = dir->child; current; current = node)
555 node = current->next;
562 dir->is_cached = true;
566 static void tree_attach(struct exfat_node* dir, struct exfat_node* node)
571 dir->child->prev = node;
572 node->next = dir->child;
577 static void tree_detach(struct exfat_node* node)
580 node->prev->next = node->next;
581 else /* this is the first node in the list */
582 node->parent->child = node->next;
584 node->next->prev = node->prev;
590 static void reset_cache(struct exfat* ef, struct exfat_node* node)
592 char buffer[EXFAT_UTF8_NAME_BUFFER_MAX];
596 struct exfat_node* p = node->child;
601 node->is_cached = false;
602 if (node->references != 0)
604 exfat_get_name(node, buffer);
605 exfat_warn("non-zero reference counter (%d) for '%s'",
606 node->references, buffer);
608 if (node != ef->root && node->is_dirty)
610 exfat_get_name(node, buffer);
611 exfat_bug("node '%s' is dirty", buffer);
613 while (node->references)
614 exfat_put_node(ef, node);
617 void exfat_reset_cache(struct exfat* ef)
619 reset_cache(ef, ef->root);
622 int exfat_flush_node(struct exfat* ef, struct exfat_node* node)
624 struct exfat_entry entries[1 + node->continuations];
625 struct exfat_entry_meta1* meta1 = (struct exfat_entry_meta1*) &entries[0];
626 struct exfat_entry_meta2* meta2 = (struct exfat_entry_meta2*) &entries[1];
630 return 0; /* no need to flush */
633 exfat_bug("unable to flush node to read-only FS");
635 if (node->parent == NULL)
636 return 0; /* do not flush unlinked node */
638 rc = read_entries(ef, node->parent, entries, 1 + node->continuations,
642 if (!check_entries(entries, 1 + node->continuations))
645 meta1->attrib = cpu_to_le16(node->attrib);
646 exfat_unix2exfat(node->mtime, &meta1->mdate, &meta1->mtime,
648 exfat_unix2exfat(node->atime, &meta1->adate, &meta1->atime, NULL);
649 meta2->size = meta2->valid_size = cpu_to_le64(node->size);
650 meta2->start_cluster = cpu_to_le32(node->start_cluster);
651 meta2->flags = EXFAT_FLAG_ALWAYS1;
652 /* empty files must not be marked as contiguous */
653 if (node->size != 0 && node->is_contiguous)
654 meta2->flags |= EXFAT_FLAG_CONTIGUOUS;
655 /* name hash remains unchanged, no need to recalculate it */
657 meta1->checksum = exfat_calc_checksum(entries, 1 + node->continuations);
658 rc = write_entries(ef, node->parent, entries, 1 + node->continuations,
663 node->is_dirty = false;
664 return exfat_flush(ef);
667 static int erase_entries(struct exfat* ef, struct exfat_node* dir, int n,
670 struct exfat_entry entries[n];
674 rc = read_entries(ef, dir, entries, n, offset);
677 for (i = 0; i < n; i++)
678 entries[i].type &= ~EXFAT_ENTRY_VALID;
679 return write_entries(ef, dir, entries, n, offset);
682 static int erase_node(struct exfat* ef, struct exfat_node* node)
686 exfat_get_node(node->parent);
687 rc = erase_entries(ef, node->parent, 1 + node->continuations,
691 exfat_put_node(ef, node->parent);
694 rc = exfat_flush_node(ef, node->parent);
695 exfat_put_node(ef, node->parent);
699 static int shrink_directory(struct exfat* ef, struct exfat_node* dir,
700 off_t deleted_offset)
702 const struct exfat_node* node;
703 const struct exfat_node* last_node;
704 uint64_t entries = 0;
707 if (!(dir->attrib & EXFAT_ATTRIB_DIR))
708 exfat_bug("attempted to shrink a file");
710 exfat_bug("attempted to shrink uncached directory");
712 for (last_node = node = dir->child; node; node = node->next)
714 if (deleted_offset < node->entry_offset)
716 /* there are other entries after the removed one, no way to shrink
720 if (last_node->entry_offset < node->entry_offset)
726 /* offset of the last entry */
727 entries += last_node->entry_offset / sizeof(struct exfat_entry);
728 /* two subentries with meta info */
730 /* subentries with file name */
731 entries += DIV_ROUND_UP(utf16_length(last_node->name),
735 new_size = DIV_ROUND_UP(entries * sizeof(struct exfat_entry),
736 CLUSTER_SIZE(*ef->sb)) * CLUSTER_SIZE(*ef->sb);
737 if (new_size == 0) /* directory always has at least 1 cluster */
738 new_size = CLUSTER_SIZE(*ef->sb);
739 if (new_size == dir->size)
741 return exfat_truncate(ef, dir, new_size, true);
744 static int delete(struct exfat* ef, struct exfat_node* node)
746 struct exfat_node* parent = node->parent;
747 off_t deleted_offset = node->entry_offset;
750 exfat_get_node(parent);
751 rc = erase_node(ef, node);
754 exfat_put_node(ef, parent);
758 rc = shrink_directory(ef, parent, deleted_offset);
759 node->is_unlinked = true;
762 exfat_flush_node(ef, parent);
763 exfat_put_node(ef, parent);
766 exfat_update_mtime(parent);
767 rc = exfat_flush_node(ef, parent);
768 exfat_put_node(ef, parent);
772 int exfat_unlink(struct exfat* ef, struct exfat_node* node)
774 if (node->attrib & EXFAT_ATTRIB_DIR)
776 return delete(ef, node);
779 int exfat_rmdir(struct exfat* ef, struct exfat_node* node)
783 if (!(node->attrib & EXFAT_ATTRIB_DIR))
785 /* check that directory is empty */
786 rc = exfat_cache_directory(ef, node);
791 return delete(ef, node);
794 static int check_slot(struct exfat* ef, struct exfat_node* dir, off_t offset,
797 struct exfat_entry entries[n];
801 /* Root directory contains entries, that don't have any nodes associated
802 with them (clusters bitmap, upper case table, label). We need to be
803 careful not to overwrite them. */
807 rc = read_entries(ef, dir, entries, n, offset);
810 for (i = 0; i < n; i++)
811 if (entries[i].type & EXFAT_ENTRY_VALID)
816 static int find_slot(struct exfat* ef, struct exfat_node* dir,
817 off_t* offset, int n)
820 struct exfat_node* p;
825 exfat_bug("directory is not cached");
827 /* build a bitmap of valid entries in the directory */
828 dmap = calloc(BMAP_SIZE(dir->size / sizeof(struct exfat_entry)),
832 exfat_error("failed to allocate directory bitmap (%"PRIu64")",
833 dir->size / sizeof(struct exfat_entry));
836 for (p = dir->child; p != NULL; p = p->next)
837 for (i = 0; i < 1 + p->continuations; i++)
838 BMAP_SET(dmap, p->entry_offset / sizeof(struct exfat_entry) + i);
840 /* find a slot in the directory entries bitmap */
841 for (i = 0; i < dir->size / sizeof(struct exfat_entry); i++)
843 if (BMAP_GET(dmap, i) == 0)
845 if (contiguous++ == 0)
846 *offset = (off_t) i * sizeof(struct exfat_entry);
848 /* suitable slot is found, check that it's not occupied */
849 switch (check_slot(ef, dir, *offset, n))
858 /* slot is occupied, continue searching */
868 /* no suitable slots found, extend the directory */
871 return exfat_truncate(ef, dir,
872 ROUND_UP(dir->size + sizeof(struct exfat_entry[n - contiguous]),
873 CLUSTER_SIZE(*ef->sb)),
877 static int commit_entry(struct exfat* ef, struct exfat_node* dir,
878 const le16_t* name, off_t offset, uint16_t attrib)
880 struct exfat_node* node;
881 const size_t name_length = utf16_length(name);
882 const int name_entries = DIV_ROUND_UP(name_length, EXFAT_ENAME_MAX);
883 struct exfat_entry entries[2 + name_entries];
884 struct exfat_entry_meta1* meta1 = (struct exfat_entry_meta1*) &entries[0];
885 struct exfat_entry_meta2* meta2 = (struct exfat_entry_meta2*) &entries[1];
889 memset(entries, 0, sizeof(struct exfat_entry[2]));
891 meta1->type = EXFAT_ENTRY_FILE;
892 meta1->continuations = 1 + name_entries;
893 meta1->attrib = cpu_to_le16(attrib);
894 exfat_unix2exfat(time(NULL), &meta1->crdate, &meta1->crtime,
896 meta1->adate = meta1->mdate = meta1->crdate;
897 meta1->atime = meta1->mtime = meta1->crtime;
898 meta1->mtime_cs = meta1->crtime_cs; /* there is no atime_cs */
900 meta2->type = EXFAT_ENTRY_FILE_INFO;
901 meta2->flags = EXFAT_FLAG_ALWAYS1;
902 meta2->name_length = name_length;
903 meta2->name_hash = exfat_calc_name_hash(ef, name, name_length);
904 meta2->start_cluster = cpu_to_le32(EXFAT_CLUSTER_FREE);
906 for (i = 0; i < name_entries; i++)
908 struct exfat_entry_name* name_entry;
910 name_entry = (struct exfat_entry_name*) &entries[2 + i];
911 name_entry->type = EXFAT_ENTRY_FILE_NAME;
912 name_entry->__unknown = 0;
913 memcpy(name_entry->name, name + i * EXFAT_ENAME_MAX,
914 EXFAT_ENAME_MAX * sizeof(le16_t));
917 meta1->checksum = exfat_calc_checksum(entries, 2 + name_entries);
918 rc = write_entries(ef, dir, entries, 2 + name_entries, offset);
922 node = allocate_node();
925 node->entry_offset = offset;
926 memcpy(node->name, name, name_length * sizeof(le16_t));
927 init_node_meta1(node, meta1);
928 init_node_meta2(node, meta2);
930 tree_attach(dir, node);
934 static int create(struct exfat* ef, const char* path, uint16_t attrib)
936 struct exfat_node* dir;
937 struct exfat_node* existing;
939 le16_t name[EXFAT_NAME_MAX + 1];
942 rc = exfat_split(ef, &dir, &existing, name, path);
945 if (existing != NULL)
947 exfat_put_node(ef, existing);
948 exfat_put_node(ef, dir);
952 rc = find_slot(ef, dir, &offset,
953 2 + DIV_ROUND_UP(utf16_length(name), EXFAT_ENAME_MAX));
956 exfat_put_node(ef, dir);
959 rc = commit_entry(ef, dir, name, offset, attrib);
962 exfat_put_node(ef, dir);
965 exfat_update_mtime(dir);
966 rc = exfat_flush_node(ef, dir);
967 exfat_put_node(ef, dir);
971 int exfat_mknod(struct exfat* ef, const char* path)
973 return create(ef, path, EXFAT_ATTRIB_ARCH);
976 int exfat_mkdir(struct exfat* ef, const char* path)
979 struct exfat_node* node;
981 rc = create(ef, path, EXFAT_ATTRIB_DIR);
984 rc = exfat_lookup(ef, &node, path);
987 /* directories always have at least one cluster */
988 rc = exfat_truncate(ef, node, CLUSTER_SIZE(*ef->sb), true);
992 exfat_put_node(ef, node);
995 rc = exfat_flush_node(ef, node);
999 exfat_put_node(ef, node);
1002 exfat_put_node(ef, node);
1006 static int rename_entry(struct exfat* ef, struct exfat_node* dir,
1007 struct exfat_node* node, const le16_t* name, off_t new_offset)
1009 const size_t name_length = utf16_length(name);
1010 const int name_entries = DIV_ROUND_UP(name_length, EXFAT_ENAME_MAX);
1011 struct exfat_entry entries[2 + name_entries];
1012 struct exfat_entry_meta1* meta1 = (struct exfat_entry_meta1*) &entries[0];
1013 struct exfat_entry_meta2* meta2 = (struct exfat_entry_meta2*) &entries[1];
1017 rc = read_entries(ef, node->parent, entries, 2, node->entry_offset);
1021 meta1->continuations = 1 + name_entries;
1022 meta2->name_length = name_length;
1023 meta2->name_hash = exfat_calc_name_hash(ef, name, name_length);
1025 rc = erase_node(ef, node);
1029 node->entry_offset = new_offset;
1030 node->continuations = 1 + name_entries;
1032 for (i = 0; i < name_entries; i++)
1034 struct exfat_entry_name* name_entry;
1036 name_entry = (struct exfat_entry_name*) &entries[2 + i];
1037 name_entry->type = EXFAT_ENTRY_FILE_NAME;
1038 name_entry->__unknown = 0;
1039 memcpy(name_entry->name, name + i * EXFAT_ENAME_MAX,
1040 EXFAT_ENAME_MAX * sizeof(le16_t));
1043 meta1->checksum = exfat_calc_checksum(entries, 2 + name_entries);
1044 rc = write_entries(ef, dir, entries, 2 + name_entries, new_offset);
1048 memcpy(node->name, name, (EXFAT_NAME_MAX + 1) * sizeof(le16_t));
1050 tree_attach(dir, node);
1054 int exfat_rename(struct exfat* ef, const char* old_path, const char* new_path)
1056 struct exfat_node* node;
1057 struct exfat_node* existing;
1058 struct exfat_node* dir;
1060 le16_t name[EXFAT_NAME_MAX + 1];
1063 rc = exfat_lookup(ef, &node, old_path);
1067 rc = exfat_split(ef, &dir, &existing, name, new_path);
1070 exfat_put_node(ef, node);
1074 /* check that target is not a subdirectory of the source */
1075 if (node->attrib & EXFAT_ATTRIB_DIR)
1077 struct exfat_node* p;
1079 for (p = dir; p; p = p->parent)
1082 if (existing != NULL)
1083 exfat_put_node(ef, existing);
1084 exfat_put_node(ef, dir);
1085 exfat_put_node(ef, node);
1090 if (existing != NULL)
1092 /* remove target if it's not the same node as source */
1093 if (existing != node)
1095 if (existing->attrib & EXFAT_ATTRIB_DIR)
1097 if (node->attrib & EXFAT_ATTRIB_DIR)
1098 rc = exfat_rmdir(ef, existing);
1104 if (!(node->attrib & EXFAT_ATTRIB_DIR))
1105 rc = exfat_unlink(ef, existing);
1109 exfat_put_node(ef, existing);
1112 /* free clusters even if something went wrong; overwise they
1113 will be just lost */
1114 exfat_cleanup_node(ef, existing);
1115 exfat_put_node(ef, dir);
1116 exfat_put_node(ef, node);
1119 rc = exfat_cleanup_node(ef, existing);
1122 exfat_put_node(ef, dir);
1123 exfat_put_node(ef, node);
1128 exfat_put_node(ef, existing);
1131 rc = find_slot(ef, dir, &offset,
1132 2 + DIV_ROUND_UP(utf16_length(name), EXFAT_ENAME_MAX));
1135 exfat_put_node(ef, dir);
1136 exfat_put_node(ef, node);
1139 rc = rename_entry(ef, dir, node, name, offset);
1142 exfat_put_node(ef, dir);
1143 exfat_put_node(ef, node);
1146 rc = exfat_flush_node(ef, dir);
1147 exfat_put_node(ef, dir);
1148 exfat_put_node(ef, node);
1149 /* node itself is not marked as dirty, no need to flush it */
1153 void exfat_utimes(struct exfat_node* node, const struct timespec tv[2])
1155 node->atime = tv[0].tv_sec;
1156 node->mtime = tv[1].tv_sec;
1157 node->is_dirty = true;
1160 void exfat_update_atime(struct exfat_node* node)
1162 node->atime = time(NULL);
1163 node->is_dirty = true;
1166 void exfat_update_mtime(struct exfat_node* node)
1168 node->mtime = time(NULL);
1169 node->is_dirty = true;
1172 const char* exfat_get_label(struct exfat* ef)
1177 static int find_label(struct exfat* ef, off_t* offset)
1179 struct exfat_entry entry;
1182 for (*offset = 0; ; *offset += sizeof(entry))
1184 rc = read_entries(ef, ef->root, &entry, 1, *offset);
1188 if (entry.type == EXFAT_ENTRY_LABEL)
1193 int exfat_set_label(struct exfat* ef, const char* label)
1195 le16_t label_utf16[EXFAT_ENAME_MAX + 1];
1198 struct exfat_entry_label entry;
1200 memset(label_utf16, 0, sizeof(label_utf16));
1201 rc = utf8_to_utf16(label_utf16, label, EXFAT_ENAME_MAX + 1, strlen(label));
1205 rc = find_label(ef, &offset);
1207 rc = find_slot(ef, ef->root, &offset, 1);
1211 entry.type = EXFAT_ENTRY_LABEL;
1212 entry.length = utf16_length(label_utf16);
1213 memcpy(entry.name, label_utf16, sizeof(entry.name));
1214 if (entry.length == 0)
1215 entry.type ^= EXFAT_ENTRY_VALID;
1217 rc = write_entries(ef, ef->root, (struct exfat_entry*) &entry, 1, offset);
1221 strcpy(ef->label, label);