1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/hfsplus/dir.c
4 *
5 * Copyright (C) 2001
6 * Brad Boyer (flar@allandria.com)
7 * (C) 2003 Ardis Technologies <roman@ardistech.com>
8 *
9 * Handling of directories
10 */
11
12 #include <linux/errno.h>
13 #include <linux/fs.h>
14 #include <linux/slab.h>
15 #include <linux/random.h>
16 #include <linux/nls.h>
17
18 #include "hfsplus_fs.h"
19 #include "hfsplus_raw.h"
20 #include "xattr.h"
21
hfsplus_instantiate(struct dentry * dentry,struct inode * inode,u32 cnid)22 static inline void hfsplus_instantiate(struct dentry *dentry,
23 struct inode *inode, u32 cnid)
24 {
25 dentry->d_fsdata = (void *)(unsigned long)cnid;
26 d_instantiate(dentry, inode);
27 }
28
29 /* Find the entry inside dir named dentry->d_name */
hfsplus_lookup(struct inode * dir,struct dentry * dentry,unsigned int flags)30 static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry,
31 unsigned int flags)
32 {
33 struct inode *inode = NULL;
34 struct hfs_find_data fd;
35 struct super_block *sb;
36 hfsplus_cat_entry entry;
37 int err;
38 u32 cnid, linkid = 0;
39 u16 type;
40
41 sb = dir->i_sb;
42
43 dentry->d_fsdata = NULL;
44 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
45 if (err)
46 return ERR_PTR(err);
47 err = hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino,
48 &dentry->d_name);
49 if (unlikely(err < 0))
50 goto fail;
51 again:
52 err = hfsplus_brec_read_cat(&fd, &entry);
53 if (err) {
54 if (err == -ENOENT) {
55 hfs_find_exit(&fd);
56 /* No such entry */
57 inode = NULL;
58 goto out;
59 }
60 goto fail;
61 }
62 type = be16_to_cpu(entry.type);
63 if (type == HFSPLUS_FOLDER) {
64 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) {
65 err = -EIO;
66 goto fail;
67 }
68 cnid = be32_to_cpu(entry.folder.id);
69 dentry->d_fsdata = (void *)(unsigned long)cnid;
70 } else if (type == HFSPLUS_FILE) {
71 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
72 err = -EIO;
73 goto fail;
74 }
75 cnid = be32_to_cpu(entry.file.id);
76 if (entry.file.user_info.fdType ==
77 cpu_to_be32(HFSP_HARDLINK_TYPE) &&
78 entry.file.user_info.fdCreator ==
79 cpu_to_be32(HFSP_HFSPLUS_CREATOR) &&
80 HFSPLUS_SB(sb)->hidden_dir &&
81 (entry.file.create_date ==
82 HFSPLUS_I(HFSPLUS_SB(sb)->hidden_dir)->
83 create_date ||
84 entry.file.create_date ==
85 HFSPLUS_I(d_inode(sb->s_root))->
86 create_date)) {
87 struct qstr str;
88 char name[32];
89
90 if (dentry->d_fsdata) {
91 /*
92 * We found a link pointing to another link,
93 * so ignore it and treat it as regular file.
94 */
95 cnid = (unsigned long)dentry->d_fsdata;
96 linkid = 0;
97 } else {
98 dentry->d_fsdata = (void *)(unsigned long)cnid;
99 linkid =
100 be32_to_cpu(entry.file.permissions.dev);
101 str.len = sprintf(name, "iNode%d", linkid);
102 str.name = name;
103 err = hfsplus_cat_build_key(sb, fd.search_key,
104 HFSPLUS_SB(sb)->hidden_dir->i_ino,
105 &str);
106 if (unlikely(err < 0))
107 goto fail;
108 goto again;
109 }
110 } else if (!dentry->d_fsdata)
111 dentry->d_fsdata = (void *)(unsigned long)cnid;
112 } else {
113 pr_err("invalid catalog entry type in lookup\n");
114 err = -EIO;
115 goto fail;
116 }
117 hfs_find_exit(&fd);
118 inode = hfsplus_iget(dir->i_sb, cnid);
119 if (IS_ERR(inode))
120 return ERR_CAST(inode);
121 if (S_ISREG(inode->i_mode))
122 HFSPLUS_I(inode)->linkid = linkid;
123 out:
124 return d_splice_alias(inode, dentry);
125 fail:
126 hfs_find_exit(&fd);
127 return ERR_PTR(err);
128 }
129
hfsplus_readdir(struct file * file,struct dir_context * ctx)130 static int hfsplus_readdir(struct file *file, struct dir_context *ctx)
131 {
132 struct inode *inode = file_inode(file);
133 struct super_block *sb = inode->i_sb;
134 int len, err;
135 char *strbuf;
136 hfsplus_cat_entry entry;
137 struct hfs_find_data fd;
138 struct hfsplus_readdir_data *rd;
139 u16 type;
140
141 if (file->f_pos >= inode->i_size)
142 return 0;
143
144 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
145 if (err)
146 return err;
147 strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN + 1, GFP_KERNEL);
148 if (!strbuf) {
149 err = -ENOMEM;
150 goto out;
151 }
152 hfsplus_cat_build_key_with_cnid(sb, fd.search_key, inode->i_ino);
153 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
154 if (err)
155 goto out;
156
157 if (ctx->pos == 0) {
158 /* This is completely artificial... */
159 if (!dir_emit_dot(file, ctx))
160 goto out;
161 ctx->pos = 1;
162 }
163 if (ctx->pos == 1) {
164 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
165 err = -EIO;
166 goto out;
167 }
168
169 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
170 fd.entrylength);
171 if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
172 pr_err("bad catalog folder thread\n");
173 err = -EIO;
174 goto out;
175 }
176 if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) {
177 pr_err("truncated catalog thread\n");
178 err = -EIO;
179 goto out;
180 }
181 if (!dir_emit(ctx, "..", 2,
182 be32_to_cpu(entry.thread.parentID), DT_DIR))
183 goto out;
184 ctx->pos = 2;
185 }
186 if (ctx->pos >= inode->i_size)
187 goto out;
188 rd = file->private_data;
189 if (rd && rd->pos == ctx->pos) {
190 memcpy(fd.search_key, &rd->key, sizeof(struct hfsplus_cat_key));
191 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
192 if (err == -ENOENT)
193 err = hfs_brec_goto(&fd, 1);
194 } else {
195 err = hfs_brec_goto(&fd, ctx->pos - 1);
196 }
197 if (err)
198 goto out;
199 for (;;) {
200 if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) {
201 pr_err("walked past end of dir\n");
202 err = -EIO;
203 goto out;
204 }
205
206 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
207 err = -EIO;
208 goto out;
209 }
210
211 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
212 fd.entrylength);
213 type = be16_to_cpu(entry.type);
214 len = NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN;
215 err = hfsplus_uni2asc_str(sb, &fd.key->cat.name, strbuf, &len);
216 if (err)
217 goto out;
218 if (type == HFSPLUS_FOLDER) {
219 if (fd.entrylength <
220 sizeof(struct hfsplus_cat_folder)) {
221 pr_err("small dir entry\n");
222 err = -EIO;
223 goto out;
224 }
225 if (HFSPLUS_SB(sb)->hidden_dir &&
226 HFSPLUS_SB(sb)->hidden_dir->i_ino ==
227 be32_to_cpu(entry.folder.id))
228 goto next;
229 if (!dir_emit(ctx, strbuf, len,
230 be32_to_cpu(entry.folder.id), DT_DIR))
231 break;
232 } else if (type == HFSPLUS_FILE) {
233 u16 mode;
234 unsigned type = DT_UNKNOWN;
235
236 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
237 pr_err("small file entry\n");
238 err = -EIO;
239 goto out;
240 }
241
242 mode = be16_to_cpu(entry.file.permissions.mode);
243 if (S_ISREG(mode))
244 type = DT_REG;
245 else if (S_ISLNK(mode))
246 type = DT_LNK;
247 else if (S_ISFIFO(mode))
248 type = DT_FIFO;
249 else if (S_ISCHR(mode))
250 type = DT_CHR;
251 else if (S_ISBLK(mode))
252 type = DT_BLK;
253 else if (S_ISSOCK(mode))
254 type = DT_SOCK;
255
256 if (!dir_emit(ctx, strbuf, len,
257 be32_to_cpu(entry.file.id), type))
258 break;
259 } else {
260 pr_err("bad catalog entry type\n");
261 err = -EIO;
262 goto out;
263 }
264 next:
265 ctx->pos++;
266 if (ctx->pos >= inode->i_size)
267 goto out;
268 err = hfs_brec_goto(&fd, 1);
269 if (err)
270 goto out;
271 }
272 if (!rd) {
273 rd = kmalloc_obj(struct hfsplus_readdir_data);
274 if (!rd) {
275 err = -ENOMEM;
276 goto out;
277 }
278 file->private_data = rd;
279 }
280 rd->pos = ctx->pos;
281 memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key));
282 out:
283 kfree(strbuf);
284 hfs_find_exit(&fd);
285 return err;
286 }
287
hfsplus_dir_release(struct inode * inode,struct file * file)288 static int hfsplus_dir_release(struct inode *inode, struct file *file)
289 {
290 kfree(file->private_data);
291 return 0;
292 }
293
hfsplus_link(struct dentry * src_dentry,struct inode * dst_dir,struct dentry * dst_dentry)294 static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir,
295 struct dentry *dst_dentry)
296 {
297 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb);
298 struct inode *inode = d_inode(src_dentry);
299 struct inode *src_dir = d_inode(src_dentry->d_parent);
300 struct qstr str;
301 char name[32];
302 u32 cnid, id;
303 int res;
304
305 if (HFSPLUS_IS_RSRC(inode))
306 return -EPERM;
307 if (!S_ISREG(inode->i_mode))
308 return -EPERM;
309
310 hfs_dbg("src_dir->i_ino %llu, dst_dir->i_ino %llu, inode->i_ino %llu\n",
311 src_dir->i_ino, dst_dir->i_ino, inode->i_ino);
312
313 mutex_lock(&sbi->vh_mutex);
314 if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) {
315 for (;;) {
316 get_random_bytes(&id, sizeof(cnid));
317 id &= 0x3fffffff;
318 str.name = name;
319 str.len = sprintf(name, "iNode%d", id);
320 res = hfsplus_rename_cat(inode->i_ino,
321 src_dir, &src_dentry->d_name,
322 sbi->hidden_dir, &str);
323 if (!res)
324 break;
325 if (res != -EEXIST)
326 goto out;
327 }
328 HFSPLUS_I(inode)->linkid = id;
329 cnid = sbi->next_cnid++;
330 src_dentry->d_fsdata = (void *)(unsigned long)cnid;
331 res = hfsplus_create_cat(cnid, src_dir,
332 &src_dentry->d_name, inode);
333 if (res)
334 /* panic? */
335 goto out;
336 sbi->file_count++;
337 }
338 cnid = sbi->next_cnid++;
339 res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode);
340 if (res)
341 goto out;
342
343 inc_nlink(inode);
344 hfsplus_instantiate(dst_dentry, inode, cnid);
345 ihold(inode);
346 inode_set_ctime_current(inode);
347 mark_inode_dirty(inode);
348 sbi->file_count++;
349 hfsplus_mark_mdb_dirty(dst_dir->i_sb);
350
351 res = hfsplus_cat_write_inode(src_dir);
352 if (res)
353 goto out;
354
355 res = hfsplus_cat_write_inode(dst_dir);
356 if (res)
357 goto out;
358
359 res = hfsplus_cat_write_inode(sbi->hidden_dir);
360 if (res)
361 goto out;
362
363 res = hfsplus_cat_write_inode(inode);
364
365 out:
366 mutex_unlock(&sbi->vh_mutex);
367 return res;
368 }
369
hfsplus_unlink(struct inode * dir,struct dentry * dentry)370 static int hfsplus_unlink(struct inode *dir, struct dentry *dentry)
371 {
372 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
373 struct inode *inode = d_inode(dentry);
374 struct qstr str;
375 char name[32];
376 u32 cnid;
377 int res;
378
379 if (HFSPLUS_IS_RSRC(inode))
380 return -EPERM;
381
382 hfs_dbg("dir->i_ino %llu, inode->i_ino %llu\n",
383 dir->i_ino, inode->i_ino);
384
385 mutex_lock(&sbi->vh_mutex);
386 cnid = (u32)(unsigned long)dentry->d_fsdata;
387 if (inode->i_ino == cnid &&
388 atomic_read(&HFSPLUS_I(inode)->opencnt)) {
389 str.name = name;
390 str.len = sprintf(name, "temp%llu", inode->i_ino);
391 res = hfsplus_rename_cat(inode->i_ino,
392 dir, &dentry->d_name,
393 sbi->hidden_dir, &str);
394 if (!res) {
395 inode->i_flags |= S_DEAD;
396 drop_nlink(inode);
397 }
398 goto out;
399 }
400 res = hfsplus_delete_cat(cnid, dir, &dentry->d_name);
401 if (res)
402 goto out;
403
404 if (inode->i_nlink > 0)
405 drop_nlink(inode);
406 if (inode->i_ino == cnid)
407 clear_nlink(inode);
408 if (!inode->i_nlink) {
409 if (inode->i_ino != cnid) {
410 sbi->file_count--;
411 if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) {
412 res = hfsplus_delete_cat(inode->i_ino,
413 sbi->hidden_dir,
414 NULL);
415 if (!res)
416 hfsplus_delete_inode(inode);
417 } else
418 inode->i_flags |= S_DEAD;
419 } else
420 hfsplus_delete_inode(inode);
421 } else
422 sbi->file_count--;
423 inode_set_ctime_current(inode);
424 mark_inode_dirty(inode);
425 out:
426 if (!res) {
427 res = hfsplus_cat_write_inode(dir);
428 if (!res) {
429 res = hfsplus_cat_write_inode(sbi->hidden_dir);
430 if (!res)
431 res = hfsplus_cat_write_inode(inode);
432 }
433 }
434
435 mutex_unlock(&sbi->vh_mutex);
436 return res;
437 }
438
hfsplus_rmdir(struct inode * dir,struct dentry * dentry)439 static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry)
440 {
441 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
442 struct inode *inode = d_inode(dentry);
443 int res;
444
445 if (inode->i_size != 2)
446 return -ENOTEMPTY;
447
448 mutex_lock(&sbi->vh_mutex);
449 res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
450 if (res)
451 goto out;
452 clear_nlink(inode);
453 inode_set_ctime_current(inode);
454 hfsplus_delete_inode(inode);
455 mark_inode_dirty(inode);
456
457 res = hfsplus_cat_write_inode(dir);
458 out:
459 mutex_unlock(&sbi->vh_mutex);
460 return res;
461 }
462
hfsplus_symlink(const struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,const char * symname)463 static int hfsplus_symlink(const struct mnt_idmap *idmap, struct inode *dir,
464 struct dentry *dentry, const char *symname)
465 {
466 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
467 struct inode *inode;
468 int res = -ENOMEM;
469
470 mutex_lock(&sbi->vh_mutex);
471 inode = hfsplus_new_inode(dir->i_sb, dir, S_IFLNK | S_IRWXUGO);
472 if (!inode)
473 goto out;
474
475 hfs_dbg("dir->i_ino %llu, inode->i_ino %llu\n",
476 dir->i_ino, inode->i_ino);
477
478 res = page_symlink(inode, symname, strlen(symname) + 1);
479 if (res)
480 goto out_err;
481
482 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
483 if (res)
484 goto out_err;
485
486 res = hfsplus_init_security(inode, dir, &dentry->d_name);
487 if (res == -EOPNOTSUPP)
488 res = 0; /* Operation is not supported. */
489 else if (res) {
490 /* Try to delete anyway without error analysis. */
491 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
492 goto out_err;
493 }
494
495 hfsplus_instantiate(dentry, inode, inode->i_ino);
496 mark_inode_dirty(inode);
497
498 res = hfsplus_cat_write_inode(dir);
499 if (res)
500 goto out;
501
502 res = hfsplus_cat_write_inode(inode);
503 goto out;
504
505 out_err:
506 clear_nlink(inode);
507 hfsplus_delete_inode(inode);
508 iput(inode);
509 out:
510 mutex_unlock(&sbi->vh_mutex);
511 return res;
512 }
513
hfsplus_mknod(const struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t mode,dev_t rdev)514 static int hfsplus_mknod(const struct mnt_idmap *idmap, struct inode *dir,
515 struct dentry *dentry, umode_t mode, dev_t rdev)
516 {
517 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
518 struct inode *inode;
519 int res = -ENOMEM;
520
521 mutex_lock(&sbi->vh_mutex);
522 inode = hfsplus_new_inode(dir->i_sb, dir, mode);
523 if (!inode)
524 goto out;
525
526 hfs_dbg("dir->i_ino %llu, inode->i_ino %llu\n",
527 dir->i_ino, inode->i_ino);
528
529 if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode))
530 init_special_inode(inode, mode, rdev);
531
532 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
533 if (res)
534 goto failed_mknod;
535
536 res = hfsplus_init_security(inode, dir, &dentry->d_name);
537 if (res == -EOPNOTSUPP)
538 res = 0; /* Operation is not supported. */
539 else if (res) {
540 /* Try to delete anyway without error analysis. */
541 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
542 goto failed_mknod;
543 }
544
545 hfsplus_instantiate(dentry, inode, inode->i_ino);
546 mark_inode_dirty(inode);
547
548 res = hfsplus_cat_write_inode(dir);
549 if (res)
550 goto out;
551
552 res = hfsplus_cat_write_inode(inode);
553 goto out;
554
555 failed_mknod:
556 clear_nlink(inode);
557 hfsplus_delete_inode(inode);
558 iput(inode);
559 out:
560 mutex_unlock(&sbi->vh_mutex);
561 return res;
562 }
563
hfsplus_create(const struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t mode)564 static int hfsplus_create(const struct mnt_idmap *idmap, struct inode *dir,
565 struct dentry *dentry, umode_t mode)
566 {
567 return hfsplus_mknod(&nop_mnt_idmap, dir, dentry, mode, 0);
568 }
569
hfsplus_mkdir(const struct mnt_idmap * idmap,struct inode * dir,struct dentry * dentry,umode_t mode)570 static struct dentry *hfsplus_mkdir(const struct mnt_idmap *idmap, struct inode *dir,
571 struct dentry *dentry, umode_t mode)
572 {
573 return ERR_PTR(hfsplus_mknod(&nop_mnt_idmap, dir, dentry, mode, 0));
574 }
575
hfsplus_rename(const struct mnt_idmap * idmap,struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)576 static int hfsplus_rename(const struct mnt_idmap *idmap,
577 struct inode *old_dir, struct dentry *old_dentry,
578 struct inode *new_dir, struct dentry *new_dentry,
579 unsigned int flags)
580 {
581 int res;
582
583 if (flags & ~RENAME_NOREPLACE)
584 return -EINVAL;
585
586 /* Unlink destination if it already exists */
587 if (d_really_is_positive(new_dentry)) {
588 if (d_is_dir(new_dentry))
589 res = hfsplus_rmdir(new_dir, new_dentry);
590 else
591 res = hfsplus_unlink(new_dir, new_dentry);
592 if (res)
593 return res;
594 }
595
596 res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata,
597 old_dir, &old_dentry->d_name,
598 new_dir, &new_dentry->d_name);
599 if (!res) {
600 struct inode *inode = d_inode(old_dentry);
601
602 new_dentry->d_fsdata = old_dentry->d_fsdata;
603
604 inode_set_ctime_current(inode);
605 mark_inode_dirty(inode);
606
607 res = hfsplus_cat_write_inode(old_dir);
608 if (res)
609 return res;
610
611 res = hfsplus_cat_write_inode(new_dir);
612 if (res)
613 return res;
614
615 res = hfsplus_cat_write_inode(inode);
616 }
617 return res;
618 }
619
620 const struct inode_operations hfsplus_dir_inode_operations = {
621 .lookup = hfsplus_lookup,
622 .create = hfsplus_create,
623 .link = hfsplus_link,
624 .unlink = hfsplus_unlink,
625 .mkdir = hfsplus_mkdir,
626 .rmdir = hfsplus_rmdir,
627 .symlink = hfsplus_symlink,
628 .mknod = hfsplus_mknod,
629 .rename = hfsplus_rename,
630 .getattr = hfsplus_getattr,
631 .listxattr = hfsplus_listxattr,
632 .fileattr_get = hfsplus_fileattr_get,
633 .fileattr_set = hfsplus_fileattr_set,
634 };
635
636 const struct file_operations hfsplus_dir_operations = {
637 .fsync = hfsplus_file_fsync,
638 .read = generic_read_dir,
639 .iterate_shared = hfsplus_readdir,
640 .unlocked_ioctl = hfsplus_ioctl,
641 .llseek = generic_file_llseek,
642 .release = hfsplus_dir_release,
643 };
644