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11#include <linux/errno.h>
12#include <linux/fs.h>
13#include <linux/slab.h>
14#include <linux/random.h>
15#include <linux/nls.h>
16
17#include "hfsplus_fs.h"
18#include "hfsplus_raw.h"
19#include "xattr.h"
20#include "acl.h"
21
22static 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
30static 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;
51again:
52 err = hfs_brec_read(&fd, &entry, sizeof(entry));
53 if (err) {
54 if (err == -ENOENT) {
55 hfs_find_exit(&fd);
56
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 (entry.file.create_date ==
81 HFSPLUS_I(HFSPLUS_SB(sb)->hidden_dir)->
82 create_date ||
83 entry.file.create_date ==
84 HFSPLUS_I(d_inode(sb->s_root))->
85 create_date) &&
86 HFSPLUS_SB(sb)->hidden_dir) {
87 struct qstr str;
88 char name[32];
89
90 if (dentry->d_fsdata) {
91
92
93
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;
123out:
124 d_add(dentry, inode);
125 return NULL;
126fail:
127 hfs_find_exit(&fd);
128 return ERR_PTR(err);
129}
130
131static int hfsplus_readdir(struct file *file, struct dir_context *ctx)
132{
133 struct inode *inode = file_inode(file);
134 struct super_block *sb = inode->i_sb;
135 int len, err;
136 char *strbuf;
137 hfsplus_cat_entry entry;
138 struct hfs_find_data fd;
139 struct hfsplus_readdir_data *rd;
140 u16 type;
141
142 if (file->f_pos >= inode->i_size)
143 return 0;
144
145 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
146 if (err)
147 return err;
148 strbuf = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN + 1, GFP_KERNEL);
149 if (!strbuf) {
150 err = -ENOMEM;
151 goto out;
152 }
153 hfsplus_cat_build_key_with_cnid(sb, fd.search_key, inode->i_ino);
154 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
155 if (err)
156 goto out;
157
158 if (ctx->pos == 0) {
159
160 if (!dir_emit_dot(file, ctx))
161 goto out;
162 ctx->pos = 1;
163 }
164 if (ctx->pos == 1) {
165 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
166 err = -EIO;
167 goto out;
168 }
169
170 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
171 fd.entrylength);
172 if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
173 pr_err("bad catalog folder thread\n");
174 err = -EIO;
175 goto out;
176 }
177 if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) {
178 pr_err("truncated catalog thread\n");
179 err = -EIO;
180 goto out;
181 }
182 if (!dir_emit(ctx, "..", 2,
183 be32_to_cpu(entry.thread.parentID), DT_DIR))
184 goto out;
185 ctx->pos = 2;
186 }
187 if (ctx->pos >= inode->i_size)
188 goto out;
189 err = hfs_brec_goto(&fd, ctx->pos - 1);
190 if (err)
191 goto out;
192 for (;;) {
193 if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) {
194 pr_err("walked past end of dir\n");
195 err = -EIO;
196 goto out;
197 }
198
199 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
200 err = -EIO;
201 goto out;
202 }
203
204 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
205 fd.entrylength);
206 type = be16_to_cpu(entry.type);
207 len = NLS_MAX_CHARSET_SIZE * HFSPLUS_MAX_STRLEN;
208 err = hfsplus_uni2asc(sb, &fd.key->cat.name, strbuf, &len);
209 if (err)
210 goto out;
211 if (type == HFSPLUS_FOLDER) {
212 if (fd.entrylength <
213 sizeof(struct hfsplus_cat_folder)) {
214 pr_err("small dir entry\n");
215 err = -EIO;
216 goto out;
217 }
218 if (HFSPLUS_SB(sb)->hidden_dir &&
219 HFSPLUS_SB(sb)->hidden_dir->i_ino ==
220 be32_to_cpu(entry.folder.id))
221 goto next;
222 if (!dir_emit(ctx, strbuf, len,
223 be32_to_cpu(entry.folder.id), DT_DIR))
224 break;
225 } else if (type == HFSPLUS_FILE) {
226 u16 mode;
227 unsigned type = DT_UNKNOWN;
228
229 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
230 pr_err("small file entry\n");
231 err = -EIO;
232 goto out;
233 }
234
235 mode = be16_to_cpu(entry.file.permissions.mode);
236 if (S_ISREG(mode))
237 type = DT_REG;
238 else if (S_ISLNK(mode))
239 type = DT_LNK;
240 else if (S_ISFIFO(mode))
241 type = DT_FIFO;
242 else if (S_ISCHR(mode))
243 type = DT_CHR;
244 else if (S_ISBLK(mode))
245 type = DT_BLK;
246 else if (S_ISSOCK(mode))
247 type = DT_SOCK;
248
249 if (!dir_emit(ctx, strbuf, len,
250 be32_to_cpu(entry.file.id), type))
251 break;
252 } else {
253 pr_err("bad catalog entry type\n");
254 err = -EIO;
255 goto out;
256 }
257next:
258 ctx->pos++;
259 if (ctx->pos >= inode->i_size)
260 goto out;
261 err = hfs_brec_goto(&fd, 1);
262 if (err)
263 goto out;
264 }
265 rd = file->private_data;
266 if (!rd) {
267 rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL);
268 if (!rd) {
269 err = -ENOMEM;
270 goto out;
271 }
272 file->private_data = rd;
273 rd->file = file;
274 spin_lock(&HFSPLUS_I(inode)->open_dir_lock);
275 list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list);
276 spin_unlock(&HFSPLUS_I(inode)->open_dir_lock);
277 }
278
279
280
281
282 memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key));
283out:
284 kfree(strbuf);
285 hfs_find_exit(&fd);
286 return err;
287}
288
289static int hfsplus_dir_release(struct inode *inode, struct file *file)
290{
291 struct hfsplus_readdir_data *rd = file->private_data;
292 if (rd) {
293 spin_lock(&HFSPLUS_I(inode)->open_dir_lock);
294 list_del(&rd->list);
295 spin_unlock(&HFSPLUS_I(inode)->open_dir_lock);
296 kfree(rd);
297 }
298 return 0;
299}
300
301static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir,
302 struct dentry *dst_dentry)
303{
304 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb);
305 struct inode *inode = d_inode(src_dentry);
306 struct inode *src_dir = d_inode(src_dentry->d_parent);
307 struct qstr str;
308 char name[32];
309 u32 cnid, id;
310 int res;
311
312 if (HFSPLUS_IS_RSRC(inode))
313 return -EPERM;
314 if (!S_ISREG(inode->i_mode))
315 return -EPERM;
316
317 mutex_lock(&sbi->vh_mutex);
318 if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) {
319 for (;;) {
320 get_random_bytes(&id, sizeof(cnid));
321 id &= 0x3fffffff;
322 str.name = name;
323 str.len = sprintf(name, "iNode%d", id);
324 res = hfsplus_rename_cat(inode->i_ino,
325 src_dir, &src_dentry->d_name,
326 sbi->hidden_dir, &str);
327 if (!res)
328 break;
329 if (res != -EEXIST)
330 goto out;
331 }
332 HFSPLUS_I(inode)->linkid = id;
333 cnid = sbi->next_cnid++;
334 src_dentry->d_fsdata = (void *)(unsigned long)cnid;
335 res = hfsplus_create_cat(cnid, src_dir,
336 &src_dentry->d_name, inode);
337 if (res)
338
339 goto out;
340 sbi->file_count++;
341 }
342 cnid = sbi->next_cnid++;
343 res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode);
344 if (res)
345 goto out;
346
347 inc_nlink(inode);
348 hfsplus_instantiate(dst_dentry, inode, cnid);
349 ihold(inode);
350 inode->i_ctime = current_time(inode);
351 mark_inode_dirty(inode);
352 sbi->file_count++;
353 hfsplus_mark_mdb_dirty(dst_dir->i_sb);
354out:
355 mutex_unlock(&sbi->vh_mutex);
356 return res;
357}
358
359static int hfsplus_unlink(struct inode *dir, struct dentry *dentry)
360{
361 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
362 struct inode *inode = d_inode(dentry);
363 struct qstr str;
364 char name[32];
365 u32 cnid;
366 int res;
367
368 if (HFSPLUS_IS_RSRC(inode))
369 return -EPERM;
370
371 mutex_lock(&sbi->vh_mutex);
372 cnid = (u32)(unsigned long)dentry->d_fsdata;
373 if (inode->i_ino == cnid &&
374 atomic_read(&HFSPLUS_I(inode)->opencnt)) {
375 str.name = name;
376 str.len = sprintf(name, "temp%lu", inode->i_ino);
377 res = hfsplus_rename_cat(inode->i_ino,
378 dir, &dentry->d_name,
379 sbi->hidden_dir, &str);
380 if (!res) {
381 inode->i_flags |= S_DEAD;
382 drop_nlink(inode);
383 }
384 goto out;
385 }
386 res = hfsplus_delete_cat(cnid, dir, &dentry->d_name);
387 if (res)
388 goto out;
389
390 if (inode->i_nlink > 0)
391 drop_nlink(inode);
392 if (inode->i_ino == cnid)
393 clear_nlink(inode);
394 if (!inode->i_nlink) {
395 if (inode->i_ino != cnid) {
396 sbi->file_count--;
397 if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) {
398 res = hfsplus_delete_cat(inode->i_ino,
399 sbi->hidden_dir,
400 NULL);
401 if (!res)
402 hfsplus_delete_inode(inode);
403 } else
404 inode->i_flags |= S_DEAD;
405 } else
406 hfsplus_delete_inode(inode);
407 } else
408 sbi->file_count--;
409 inode->i_ctime = current_time(inode);
410 mark_inode_dirty(inode);
411out:
412 mutex_unlock(&sbi->vh_mutex);
413 return res;
414}
415
416static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry)
417{
418 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
419 struct inode *inode = d_inode(dentry);
420 int res;
421
422 if (inode->i_size != 2)
423 return -ENOTEMPTY;
424
425 mutex_lock(&sbi->vh_mutex);
426 res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
427 if (res)
428 goto out;
429 clear_nlink(inode);
430 inode->i_ctime = current_time(inode);
431 hfsplus_delete_inode(inode);
432 mark_inode_dirty(inode);
433out:
434 mutex_unlock(&sbi->vh_mutex);
435 return res;
436}
437
438static int hfsplus_symlink(struct inode *dir, struct dentry *dentry,
439 const char *symname)
440{
441 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
442 struct inode *inode;
443 int res = -ENOMEM;
444
445 mutex_lock(&sbi->vh_mutex);
446 inode = hfsplus_new_inode(dir->i_sb, S_IFLNK | S_IRWXUGO);
447 if (!inode)
448 goto out;
449
450 res = page_symlink(inode, symname, strlen(symname) + 1);
451 if (res)
452 goto out_err;
453
454 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
455 if (res)
456 goto out_err;
457
458 res = hfsplus_init_inode_security(inode, dir, &dentry->d_name);
459 if (res == -EOPNOTSUPP)
460 res = 0;
461 else if (res) {
462
463 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
464 goto out_err;
465 }
466
467 hfsplus_instantiate(dentry, inode, inode->i_ino);
468 mark_inode_dirty(inode);
469 goto out;
470
471out_err:
472 clear_nlink(inode);
473 hfsplus_delete_inode(inode);
474 iput(inode);
475out:
476 mutex_unlock(&sbi->vh_mutex);
477 return res;
478}
479
480static int hfsplus_mknod(struct inode *dir, struct dentry *dentry,
481 umode_t mode, dev_t rdev)
482{
483 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
484 struct inode *inode;
485 int res = -ENOMEM;
486
487 mutex_lock(&sbi->vh_mutex);
488 inode = hfsplus_new_inode(dir->i_sb, mode);
489 if (!inode)
490 goto out;
491
492 if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode))
493 init_special_inode(inode, mode, rdev);
494
495 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
496 if (res)
497 goto failed_mknod;
498
499 res = hfsplus_init_inode_security(inode, dir, &dentry->d_name);
500 if (res == -EOPNOTSUPP)
501 res = 0;
502 else if (res) {
503
504 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
505 goto failed_mknod;
506 }
507
508 hfsplus_instantiate(dentry, inode, inode->i_ino);
509 mark_inode_dirty(inode);
510 goto out;
511
512failed_mknod:
513 clear_nlink(inode);
514 hfsplus_delete_inode(inode);
515 iput(inode);
516out:
517 mutex_unlock(&sbi->vh_mutex);
518 return res;
519}
520
521static int hfsplus_create(struct inode *dir, struct dentry *dentry, umode_t mode,
522 bool excl)
523{
524 return hfsplus_mknod(dir, dentry, mode, 0);
525}
526
527static int hfsplus_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
528{
529 return hfsplus_mknod(dir, dentry, mode | S_IFDIR, 0);
530}
531
532static int hfsplus_rename(struct inode *old_dir, struct dentry *old_dentry,
533 struct inode *new_dir, struct dentry *new_dentry,
534 unsigned int flags)
535{
536 int res;
537
538 if (flags & ~RENAME_NOREPLACE)
539 return -EINVAL;
540
541
542 if (d_really_is_positive(new_dentry)) {
543 if (d_is_dir(new_dentry))
544 res = hfsplus_rmdir(new_dir, new_dentry);
545 else
546 res = hfsplus_unlink(new_dir, new_dentry);
547 if (res)
548 return res;
549 }
550
551 res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata,
552 old_dir, &old_dentry->d_name,
553 new_dir, &new_dentry->d_name);
554 if (!res)
555 new_dentry->d_fsdata = old_dentry->d_fsdata;
556 return res;
557}
558
559const struct inode_operations hfsplus_dir_inode_operations = {
560 .lookup = hfsplus_lookup,
561 .create = hfsplus_create,
562 .link = hfsplus_link,
563 .unlink = hfsplus_unlink,
564 .mkdir = hfsplus_mkdir,
565 .rmdir = hfsplus_rmdir,
566 .symlink = hfsplus_symlink,
567 .mknod = hfsplus_mknod,
568 .rename = hfsplus_rename,
569 .listxattr = hfsplus_listxattr,
570#ifdef CONFIG_HFSPLUS_FS_POSIX_ACL
571 .get_acl = hfsplus_get_posix_acl,
572 .set_acl = hfsplus_set_posix_acl,
573#endif
574};
575
576const struct file_operations hfsplus_dir_operations = {
577 .fsync = hfsplus_file_fsync,
578 .read = generic_read_dir,
579 .iterate_shared = hfsplus_readdir,
580 .unlocked_ioctl = hfsplus_ioctl,
581 .llseek = generic_file_llseek,
582 .release = hfsplus_dir_release,
583};
584
