GNU Linux-libre 4.19.211-gnu1
[releases.git] / fs / hfsplus / catalog.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  *  linux/fs/hfsplus/catalog.c
4  *
5  * Copyright (C) 2001
6  * Brad Boyer (flar@allandria.com)
7  * (C) 2003 Ardis Technologies <roman@ardistech.com>
8  *
9  * Handling of catalog records
10  */
11
12
13 #include "hfsplus_fs.h"
14 #include "hfsplus_raw.h"
15
16 int hfsplus_cat_case_cmp_key(const hfsplus_btree_key *k1,
17                              const hfsplus_btree_key *k2)
18 {
19         __be32 k1p, k2p;
20
21         k1p = k1->cat.parent;
22         k2p = k2->cat.parent;
23         if (k1p != k2p)
24                 return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
25
26         return hfsplus_strcasecmp(&k1->cat.name, &k2->cat.name);
27 }
28
29 int hfsplus_cat_bin_cmp_key(const hfsplus_btree_key *k1,
30                             const hfsplus_btree_key *k2)
31 {
32         __be32 k1p, k2p;
33
34         k1p = k1->cat.parent;
35         k2p = k2->cat.parent;
36         if (k1p != k2p)
37                 return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
38
39         return hfsplus_strcmp(&k1->cat.name, &k2->cat.name);
40 }
41
42 /* Generates key for catalog file/folders record. */
43 int hfsplus_cat_build_key(struct super_block *sb,
44                 hfsplus_btree_key *key, u32 parent, const struct qstr *str)
45 {
46         int len, err;
47
48         key->cat.parent = cpu_to_be32(parent);
49         err = hfsplus_asc2uni(sb, &key->cat.name, HFSPLUS_MAX_STRLEN,
50                         str->name, str->len);
51         if (unlikely(err < 0))
52                 return err;
53
54         len = be16_to_cpu(key->cat.name.length);
55         key->key_len = cpu_to_be16(6 + 2 * len);
56         return 0;
57 }
58
59 /* Generates key for catalog thread record. */
60 void hfsplus_cat_build_key_with_cnid(struct super_block *sb,
61                         hfsplus_btree_key *key, u32 parent)
62 {
63         key->cat.parent = cpu_to_be32(parent);
64         key->cat.name.length = 0;
65         key->key_len = cpu_to_be16(6);
66 }
67
68 static void hfsplus_cat_build_key_uni(hfsplus_btree_key *key, u32 parent,
69                                       struct hfsplus_unistr *name)
70 {
71         int ustrlen;
72
73         ustrlen = be16_to_cpu(name->length);
74         key->cat.parent = cpu_to_be32(parent);
75         key->cat.name.length = cpu_to_be16(ustrlen);
76         ustrlen *= 2;
77         memcpy(key->cat.name.unicode, name->unicode, ustrlen);
78         key->key_len = cpu_to_be16(6 + ustrlen);
79 }
80
81 void hfsplus_cat_set_perms(struct inode *inode, struct hfsplus_perm *perms)
82 {
83         if (inode->i_flags & S_IMMUTABLE)
84                 perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
85         else
86                 perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
87         if (inode->i_flags & S_APPEND)
88                 perms->rootflags |= HFSPLUS_FLG_APPEND;
89         else
90                 perms->rootflags &= ~HFSPLUS_FLG_APPEND;
91
92         perms->userflags = HFSPLUS_I(inode)->userflags;
93         perms->mode = cpu_to_be16(inode->i_mode);
94         perms->owner = cpu_to_be32(i_uid_read(inode));
95         perms->group = cpu_to_be32(i_gid_read(inode));
96
97         if (S_ISREG(inode->i_mode))
98                 perms->dev = cpu_to_be32(inode->i_nlink);
99         else if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode))
100                 perms->dev = cpu_to_be32(inode->i_rdev);
101         else
102                 perms->dev = 0;
103 }
104
105 static int hfsplus_cat_build_record(hfsplus_cat_entry *entry,
106                 u32 cnid, struct inode *inode)
107 {
108         struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
109
110         if (S_ISDIR(inode->i_mode)) {
111                 struct hfsplus_cat_folder *folder;
112
113                 folder = &entry->folder;
114                 memset(folder, 0, sizeof(*folder));
115                 folder->type = cpu_to_be16(HFSPLUS_FOLDER);
116                 if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags))
117                         folder->flags |= cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT);
118                 folder->id = cpu_to_be32(inode->i_ino);
119                 HFSPLUS_I(inode)->create_date =
120                         folder->create_date =
121                         folder->content_mod_date =
122                         folder->attribute_mod_date =
123                         folder->access_date = hfsp_now2mt();
124                 hfsplus_cat_set_perms(inode, &folder->permissions);
125                 if (inode == sbi->hidden_dir)
126                         /* invisible and namelocked */
127                         folder->user_info.frFlags = cpu_to_be16(0x5000);
128                 return sizeof(*folder);
129         } else {
130                 struct hfsplus_cat_file *file;
131
132                 file = &entry->file;
133                 memset(file, 0, sizeof(*file));
134                 file->type = cpu_to_be16(HFSPLUS_FILE);
135                 file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
136                 file->id = cpu_to_be32(cnid);
137                 HFSPLUS_I(inode)->create_date =
138                         file->create_date =
139                         file->content_mod_date =
140                         file->attribute_mod_date =
141                         file->access_date = hfsp_now2mt();
142                 if (cnid == inode->i_ino) {
143                         hfsplus_cat_set_perms(inode, &file->permissions);
144                         if (S_ISLNK(inode->i_mode)) {
145                                 file->user_info.fdType =
146                                         cpu_to_be32(HFSP_SYMLINK_TYPE);
147                                 file->user_info.fdCreator =
148                                         cpu_to_be32(HFSP_SYMLINK_CREATOR);
149                         } else {
150                                 file->user_info.fdType =
151                                         cpu_to_be32(sbi->type);
152                                 file->user_info.fdCreator =
153                                         cpu_to_be32(sbi->creator);
154                         }
155                         if (HFSPLUS_FLG_IMMUTABLE &
156                                         (file->permissions.rootflags |
157                                         file->permissions.userflags))
158                                 file->flags |=
159                                         cpu_to_be16(HFSPLUS_FILE_LOCKED);
160                 } else {
161                         file->user_info.fdType =
162                                 cpu_to_be32(HFSP_HARDLINK_TYPE);
163                         file->user_info.fdCreator =
164                                 cpu_to_be32(HFSP_HFSPLUS_CREATOR);
165                         file->user_info.fdFlags =
166                                 cpu_to_be16(0x100);
167                         file->create_date =
168                                 HFSPLUS_I(sbi->hidden_dir)->create_date;
169                         file->permissions.dev =
170                                 cpu_to_be32(HFSPLUS_I(inode)->linkid);
171                 }
172                 return sizeof(*file);
173         }
174 }
175
176 static int hfsplus_fill_cat_thread(struct super_block *sb,
177                                    hfsplus_cat_entry *entry, int type,
178                                    u32 parentid, const struct qstr *str)
179 {
180         int err;
181
182         entry->type = cpu_to_be16(type);
183         entry->thread.reserved = 0;
184         entry->thread.parentID = cpu_to_be32(parentid);
185         err = hfsplus_asc2uni(sb, &entry->thread.nodeName, HFSPLUS_MAX_STRLEN,
186                                 str->name, str->len);
187         if (unlikely(err < 0))
188                 return err;
189
190         return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
191 }
192
193 /* Try to get a catalog entry for given catalog id */
194 int hfsplus_find_cat(struct super_block *sb, u32 cnid,
195                      struct hfs_find_data *fd)
196 {
197         hfsplus_cat_entry tmp;
198         int err;
199         u16 type;
200
201         hfsplus_cat_build_key_with_cnid(sb, fd->search_key, cnid);
202         err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
203         if (err)
204                 return err;
205
206         type = be16_to_cpu(tmp.type);
207         if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
208                 pr_err("found bad thread record in catalog\n");
209                 return -EIO;
210         }
211
212         if (be16_to_cpu(tmp.thread.nodeName.length) > 255) {
213                 pr_err("catalog name length corrupted\n");
214                 return -EIO;
215         }
216
217         hfsplus_cat_build_key_uni(fd->search_key,
218                 be32_to_cpu(tmp.thread.parentID),
219                 &tmp.thread.nodeName);
220         return hfs_brec_find(fd, hfs_find_rec_by_key);
221 }
222
223 static void hfsplus_subfolders_inc(struct inode *dir)
224 {
225         struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
226
227         if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
228                 /*
229                  * Increment subfolder count. Note, the value is only meaningful
230                  * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
231                  */
232                 HFSPLUS_I(dir)->subfolders++;
233         }
234 }
235
236 static void hfsplus_subfolders_dec(struct inode *dir)
237 {
238         struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
239
240         if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
241                 /*
242                  * Decrement subfolder count. Note, the value is only meaningful
243                  * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
244                  *
245                  * Check for zero. Some subfolders may have been created
246                  * by an implementation ignorant of this counter.
247                  */
248                 if (HFSPLUS_I(dir)->subfolders)
249                         HFSPLUS_I(dir)->subfolders--;
250         }
251 }
252
253 int hfsplus_create_cat(u32 cnid, struct inode *dir,
254                 const struct qstr *str, struct inode *inode)
255 {
256         struct super_block *sb = dir->i_sb;
257         struct hfs_find_data fd;
258         hfsplus_cat_entry entry;
259         int entry_size;
260         int err;
261
262         hfs_dbg(CAT_MOD, "create_cat: %s,%u(%d)\n",
263                 str->name, cnid, inode->i_nlink);
264         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
265         if (err)
266                 return err;
267
268         /*
269          * Fail early and avoid ENOSPC during the btree operations. We may
270          * have to split the root node at most once.
271          */
272         err = hfs_bmap_reserve(fd.tree, 2 * fd.tree->depth);
273         if (err)
274                 goto err2;
275
276         hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
277         entry_size = hfsplus_fill_cat_thread(sb, &entry,
278                 S_ISDIR(inode->i_mode) ?
279                         HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
280                 dir->i_ino, str);
281         if (unlikely(entry_size < 0)) {
282                 err = entry_size;
283                 goto err2;
284         }
285
286         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
287         if (err != -ENOENT) {
288                 if (!err)
289                         err = -EEXIST;
290                 goto err2;
291         }
292         err = hfs_brec_insert(&fd, &entry, entry_size);
293         if (err)
294                 goto err2;
295
296         err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
297         if (unlikely(err))
298                 goto err1;
299
300         entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
301         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
302         if (err != -ENOENT) {
303                 /* panic? */
304                 if (!err)
305                         err = -EEXIST;
306                 goto err1;
307         }
308         err = hfs_brec_insert(&fd, &entry, entry_size);
309         if (err)
310                 goto err1;
311
312         dir->i_size++;
313         if (S_ISDIR(inode->i_mode))
314                 hfsplus_subfolders_inc(dir);
315         dir->i_mtime = dir->i_ctime = current_time(dir);
316         hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
317
318         hfs_find_exit(&fd);
319         return 0;
320
321 err1:
322         hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
323         if (!hfs_brec_find(&fd, hfs_find_rec_by_key))
324                 hfs_brec_remove(&fd);
325 err2:
326         hfs_find_exit(&fd);
327         return err;
328 }
329
330 int hfsplus_delete_cat(u32 cnid, struct inode *dir, const struct qstr *str)
331 {
332         struct super_block *sb = dir->i_sb;
333         struct hfs_find_data fd;
334         struct hfsplus_fork_raw fork;
335         struct list_head *pos;
336         int err, off;
337         u16 type;
338
339         hfs_dbg(CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
340         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
341         if (err)
342                 return err;
343
344         /*
345          * Fail early and avoid ENOSPC during the btree operations. We may
346          * have to split the root node at most once.
347          */
348         err = hfs_bmap_reserve(fd.tree, 2 * (int)fd.tree->depth - 2);
349         if (err)
350                 goto out;
351
352         if (!str) {
353                 int len;
354
355                 hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
356                 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
357                 if (err)
358                         goto out;
359
360                 off = fd.entryoffset +
361                         offsetof(struct hfsplus_cat_thread, nodeName);
362                 fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
363                 hfs_bnode_read(fd.bnode,
364                         &fd.search_key->cat.name.length, off, 2);
365                 len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
366                 hfs_bnode_read(fd.bnode,
367                         &fd.search_key->cat.name.unicode,
368                         off + 2, len);
369                 fd.search_key->key_len = cpu_to_be16(6 + len);
370         } else {
371                 err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
372                 if (unlikely(err))
373                         goto out;
374         }
375
376         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
377         if (err)
378                 goto out;
379
380         type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
381         if (type == HFSPLUS_FILE) {
382 #if 0
383                 off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
384                 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
385                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
386 #endif
387
388                 off = fd.entryoffset +
389                         offsetof(struct hfsplus_cat_file, rsrc_fork);
390                 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
391                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
392         }
393
394         /* we only need to take spinlock for exclusion with ->release() */
395         spin_lock(&HFSPLUS_I(dir)->open_dir_lock);
396         list_for_each(pos, &HFSPLUS_I(dir)->open_dir_list) {
397                 struct hfsplus_readdir_data *rd =
398                         list_entry(pos, struct hfsplus_readdir_data, list);
399                 if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
400                         rd->file->f_pos--;
401         }
402         spin_unlock(&HFSPLUS_I(dir)->open_dir_lock);
403
404         err = hfs_brec_remove(&fd);
405         if (err)
406                 goto out;
407
408         hfsplus_cat_build_key_with_cnid(sb, fd.search_key, cnid);
409         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
410         if (err)
411                 goto out;
412
413         err = hfs_brec_remove(&fd);
414         if (err)
415                 goto out;
416
417         dir->i_size--;
418         if (type == HFSPLUS_FOLDER)
419                 hfsplus_subfolders_dec(dir);
420         dir->i_mtime = dir->i_ctime = current_time(dir);
421         hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
422
423         if (type == HFSPLUS_FILE || type == HFSPLUS_FOLDER) {
424                 if (HFSPLUS_SB(sb)->attr_tree)
425                         hfsplus_delete_all_attrs(dir, cnid);
426         }
427
428 out:
429         hfs_find_exit(&fd);
430
431         return err;
432 }
433
434 int hfsplus_rename_cat(u32 cnid,
435                        struct inode *src_dir, const struct qstr *src_name,
436                        struct inode *dst_dir, const struct qstr *dst_name)
437 {
438         struct super_block *sb = src_dir->i_sb;
439         struct hfs_find_data src_fd, dst_fd;
440         hfsplus_cat_entry entry;
441         int entry_size, type;
442         int err;
443
444         hfs_dbg(CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n",
445                 cnid, src_dir->i_ino, src_name->name,
446                 dst_dir->i_ino, dst_name->name);
447         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd);
448         if (err)
449                 return err;
450         dst_fd = src_fd;
451
452         /*
453          * Fail early and avoid ENOSPC during the btree operations. We may
454          * have to split the root node at most twice.
455          */
456         err = hfs_bmap_reserve(src_fd.tree, 4 * (int)src_fd.tree->depth - 1);
457         if (err)
458                 goto out;
459
460         /* find the old dir entry and read the data */
461         err = hfsplus_cat_build_key(sb, src_fd.search_key,
462                         src_dir->i_ino, src_name);
463         if (unlikely(err))
464                 goto out;
465
466         err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
467         if (err)
468                 goto out;
469         if (src_fd.entrylength > sizeof(entry) || src_fd.entrylength < 0) {
470                 err = -EIO;
471                 goto out;
472         }
473
474         hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
475                                 src_fd.entrylength);
476         type = be16_to_cpu(entry.type);
477
478         /* create new dir entry with the data from the old entry */
479         err = hfsplus_cat_build_key(sb, dst_fd.search_key,
480                         dst_dir->i_ino, dst_name);
481         if (unlikely(err))
482                 goto out;
483
484         err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
485         if (err != -ENOENT) {
486                 if (!err)
487                         err = -EEXIST;
488                 goto out;
489         }
490
491         err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
492         if (err)
493                 goto out;
494         dst_dir->i_size++;
495         if (type == HFSPLUS_FOLDER)
496                 hfsplus_subfolders_inc(dst_dir);
497         dst_dir->i_mtime = dst_dir->i_ctime = current_time(dst_dir);
498
499         /* finally remove the old entry */
500         err = hfsplus_cat_build_key(sb, src_fd.search_key,
501                         src_dir->i_ino, src_name);
502         if (unlikely(err))
503                 goto out;
504
505         err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
506         if (err)
507                 goto out;
508         err = hfs_brec_remove(&src_fd);
509         if (err)
510                 goto out;
511         src_dir->i_size--;
512         if (type == HFSPLUS_FOLDER)
513                 hfsplus_subfolders_dec(src_dir);
514         src_dir->i_mtime = src_dir->i_ctime = current_time(src_dir);
515
516         /* remove old thread entry */
517         hfsplus_cat_build_key_with_cnid(sb, src_fd.search_key, cnid);
518         err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
519         if (err)
520                 goto out;
521         type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
522         err = hfs_brec_remove(&src_fd);
523         if (err)
524                 goto out;
525
526         /* create new thread entry */
527         hfsplus_cat_build_key_with_cnid(sb, dst_fd.search_key, cnid);
528         entry_size = hfsplus_fill_cat_thread(sb, &entry, type,
529                 dst_dir->i_ino, dst_name);
530         if (unlikely(entry_size < 0)) {
531                 err = entry_size;
532                 goto out;
533         }
534
535         err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
536         if (err != -ENOENT) {
537                 if (!err)
538                         err = -EEXIST;
539                 goto out;
540         }
541         err = hfs_brec_insert(&dst_fd, &entry, entry_size);
542
543         hfsplus_mark_inode_dirty(dst_dir, HFSPLUS_I_CAT_DIRTY);
544         hfsplus_mark_inode_dirty(src_dir, HFSPLUS_I_CAT_DIRTY);
545 out:
546         hfs_bnode_put(dst_fd.bnode);
547         hfs_find_exit(&src_fd);
548         return err;
549 }