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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
16#include "hfsplus_fs.h"
17#include "hfsplus_raw.h"
18#include "xattr.h"
19
20static inline void hfsplus_instantiate(struct dentry *dentry,
21 struct inode *inode, u32 cnid)
22{
23 dentry->d_fsdata = (void *)(unsigned long)cnid;
24 d_instantiate(dentry, inode);
25}
26
27
28static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry,
29 unsigned int flags)
30{
31 struct inode *inode = NULL;
32 struct hfs_find_data fd;
33 struct super_block *sb;
34 hfsplus_cat_entry entry;
35 int err;
36 u32 cnid, linkid = 0;
37 u16 type;
38
39 sb = dir->i_sb;
40
41 dentry->d_fsdata = NULL;
42 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
43 if (err)
44 return ERR_PTR(err);
45 hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, &dentry->d_name);
46again:
47 err = hfs_brec_read(&fd, &entry, sizeof(entry));
48 if (err) {
49 if (err == -ENOENT) {
50 hfs_find_exit(&fd);
51
52 inode = NULL;
53 goto out;
54 }
55 goto fail;
56 }
57 type = be16_to_cpu(entry.type);
58 if (type == HFSPLUS_FOLDER) {
59 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) {
60 err = -EIO;
61 goto fail;
62 }
63 cnid = be32_to_cpu(entry.folder.id);
64 dentry->d_fsdata = (void *)(unsigned long)cnid;
65 } else if (type == HFSPLUS_FILE) {
66 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
67 err = -EIO;
68 goto fail;
69 }
70 cnid = be32_to_cpu(entry.file.id);
71 if (entry.file.user_info.fdType ==
72 cpu_to_be32(HFSP_HARDLINK_TYPE) &&
73 entry.file.user_info.fdCreator ==
74 cpu_to_be32(HFSP_HFSPLUS_CREATOR) &&
75 (entry.file.create_date ==
76 HFSPLUS_I(HFSPLUS_SB(sb)->hidden_dir)->
77 create_date ||
78 entry.file.create_date ==
79 HFSPLUS_I(sb->s_root->d_inode)->
80 create_date) &&
81 HFSPLUS_SB(sb)->hidden_dir) {
82 struct qstr str;
83 char name[32];
84
85 if (dentry->d_fsdata) {
86
87
88
89
90 cnid = (unsigned long)dentry->d_fsdata;
91 linkid = 0;
92 } else {
93 dentry->d_fsdata = (void *)(unsigned long)cnid;
94 linkid =
95 be32_to_cpu(entry.file.permissions.dev);
96 str.len = sprintf(name, "iNode%d", linkid);
97 str.name = name;
98 hfsplus_cat_build_key(sb, fd.search_key,
99 HFSPLUS_SB(sb)->hidden_dir->i_ino,
100 &str);
101 goto again;
102 }
103 } else if (!dentry->d_fsdata)
104 dentry->d_fsdata = (void *)(unsigned long)cnid;
105 } else {
106 pr_err("invalid catalog entry type in lookup\n");
107 err = -EIO;
108 goto fail;
109 }
110 hfs_find_exit(&fd);
111 inode = hfsplus_iget(dir->i_sb, cnid);
112 if (IS_ERR(inode))
113 return ERR_CAST(inode);
114 if (S_ISREG(inode->i_mode))
115 HFSPLUS_I(inode)->linkid = linkid;
116out:
117 d_add(dentry, inode);
118 return NULL;
119fail:
120 hfs_find_exit(&fd);
121 return ERR_PTR(err);
122}
123
124static int hfsplus_readdir(struct file *file, struct dir_context *ctx)
125{
126 struct inode *inode = file_inode(file);
127 struct super_block *sb = inode->i_sb;
128 int len, err;
129 char strbuf[HFSPLUS_MAX_STRLEN + 1];
130 hfsplus_cat_entry entry;
131 struct hfs_find_data fd;
132 struct hfsplus_readdir_data *rd;
133 u16 type;
134
135 if (file->f_pos >= inode->i_size)
136 return 0;
137
138 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
139 if (err)
140 return err;
141 hfsplus_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
142 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
143 if (err)
144 goto out;
145
146 if (ctx->pos == 0) {
147
148 if (!dir_emit_dot(file, ctx))
149 goto out;
150 ctx->pos = 1;
151 }
152 if (ctx->pos == 1) {
153 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
154 err = -EIO;
155 goto out;
156 }
157
158 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
159 fd.entrylength);
160 if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) {
161 pr_err("bad catalog folder thread\n");
162 err = -EIO;
163 goto out;
164 }
165 if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) {
166 pr_err("truncated catalog thread\n");
167 err = -EIO;
168 goto out;
169 }
170 if (!dir_emit(ctx, "..", 2,
171 be32_to_cpu(entry.thread.parentID), DT_DIR))
172 goto out;
173 ctx->pos = 2;
174 }
175 if (ctx->pos >= inode->i_size)
176 goto out;
177 err = hfs_brec_goto(&fd, ctx->pos - 1);
178 if (err)
179 goto out;
180 for (;;) {
181 if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) {
182 pr_err("walked past end of dir\n");
183 err = -EIO;
184 goto out;
185 }
186
187 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
188 err = -EIO;
189 goto out;
190 }
191
192 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset,
193 fd.entrylength);
194 type = be16_to_cpu(entry.type);
195 len = HFSPLUS_MAX_STRLEN;
196 err = hfsplus_uni2asc(sb, &fd.key->cat.name, strbuf, &len);
197 if (err)
198 goto out;
199 if (type == HFSPLUS_FOLDER) {
200 if (fd.entrylength <
201 sizeof(struct hfsplus_cat_folder)) {
202 pr_err("small dir entry\n");
203 err = -EIO;
204 goto out;
205 }
206 if (HFSPLUS_SB(sb)->hidden_dir &&
207 HFSPLUS_SB(sb)->hidden_dir->i_ino ==
208 be32_to_cpu(entry.folder.id))
209 goto next;
210 if (!dir_emit(ctx, strbuf, len,
211 be32_to_cpu(entry.folder.id), DT_DIR))
212 break;
213 } else if (type == HFSPLUS_FILE) {
214 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) {
215 pr_err("small file entry\n");
216 err = -EIO;
217 goto out;
218 }
219 if (!dir_emit(ctx, strbuf, len,
220 be32_to_cpu(entry.file.id), DT_REG))
221 break;
222 } else {
223 pr_err("bad catalog entry type\n");
224 err = -EIO;
225 goto out;
226 }
227next:
228 ctx->pos++;
229 if (ctx->pos >= inode->i_size)
230 goto out;
231 err = hfs_brec_goto(&fd, 1);
232 if (err)
233 goto out;
234 }
235 rd = file->private_data;
236 if (!rd) {
237 rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL);
238 if (!rd) {
239 err = -ENOMEM;
240 goto out;
241 }
242 file->private_data = rd;
243 rd->file = file;
244 list_add(&rd->list, &HFSPLUS_I(inode)->open_dir_list);
245 }
246 memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key));
247out:
248 hfs_find_exit(&fd);
249 return err;
250}
251
252static int hfsplus_dir_release(struct inode *inode, struct file *file)
253{
254 struct hfsplus_readdir_data *rd = file->private_data;
255 if (rd) {
256 mutex_lock(&inode->i_mutex);
257 list_del(&rd->list);
258 mutex_unlock(&inode->i_mutex);
259 kfree(rd);
260 }
261 return 0;
262}
263
264static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir,
265 struct dentry *dst_dentry)
266{
267 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dst_dir->i_sb);
268 struct inode *inode = src_dentry->d_inode;
269 struct inode *src_dir = src_dentry->d_parent->d_inode;
270 struct qstr str;
271 char name[32];
272 u32 cnid, id;
273 int res;
274
275 if (HFSPLUS_IS_RSRC(inode))
276 return -EPERM;
277 if (!S_ISREG(inode->i_mode))
278 return -EPERM;
279
280 mutex_lock(&sbi->vh_mutex);
281 if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) {
282 for (;;) {
283 get_random_bytes(&id, sizeof(cnid));
284 id &= 0x3fffffff;
285 str.name = name;
286 str.len = sprintf(name, "iNode%d", id);
287 res = hfsplus_rename_cat(inode->i_ino,
288 src_dir, &src_dentry->d_name,
289 sbi->hidden_dir, &str);
290 if (!res)
291 break;
292 if (res != -EEXIST)
293 goto out;
294 }
295 HFSPLUS_I(inode)->linkid = id;
296 cnid = sbi->next_cnid++;
297 src_dentry->d_fsdata = (void *)(unsigned long)cnid;
298 res = hfsplus_create_cat(cnid, src_dir,
299 &src_dentry->d_name, inode);
300 if (res)
301
302 goto out;
303 sbi->file_count++;
304 }
305 cnid = sbi->next_cnid++;
306 res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode);
307 if (res)
308 goto out;
309
310 inc_nlink(inode);
311 hfsplus_instantiate(dst_dentry, inode, cnid);
312 ihold(inode);
313 inode->i_ctime = CURRENT_TIME_SEC;
314 mark_inode_dirty(inode);
315 sbi->file_count++;
316 hfsplus_mark_mdb_dirty(dst_dir->i_sb);
317out:
318 mutex_unlock(&sbi->vh_mutex);
319 return res;
320}
321
322static int hfsplus_unlink(struct inode *dir, struct dentry *dentry)
323{
324 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
325 struct inode *inode = dentry->d_inode;
326 struct qstr str;
327 char name[32];
328 u32 cnid;
329 int res;
330
331 if (HFSPLUS_IS_RSRC(inode))
332 return -EPERM;
333
334 mutex_lock(&sbi->vh_mutex);
335 cnid = (u32)(unsigned long)dentry->d_fsdata;
336 if (inode->i_ino == cnid &&
337 atomic_read(&HFSPLUS_I(inode)->opencnt)) {
338 str.name = name;
339 str.len = sprintf(name, "temp%lu", inode->i_ino);
340 res = hfsplus_rename_cat(inode->i_ino,
341 dir, &dentry->d_name,
342 sbi->hidden_dir, &str);
343 if (!res) {
344 inode->i_flags |= S_DEAD;
345 drop_nlink(inode);
346 }
347 goto out;
348 }
349 res = hfsplus_delete_cat(cnid, dir, &dentry->d_name);
350 if (res)
351 goto out;
352
353 if (inode->i_nlink > 0)
354 drop_nlink(inode);
355 if (inode->i_ino == cnid)
356 clear_nlink(inode);
357 if (!inode->i_nlink) {
358 if (inode->i_ino != cnid) {
359 sbi->file_count--;
360 if (!atomic_read(&HFSPLUS_I(inode)->opencnt)) {
361 res = hfsplus_delete_cat(inode->i_ino,
362 sbi->hidden_dir,
363 NULL);
364 if (!res)
365 hfsplus_delete_inode(inode);
366 } else
367 inode->i_flags |= S_DEAD;
368 } else
369 hfsplus_delete_inode(inode);
370 } else
371 sbi->file_count--;
372 inode->i_ctime = CURRENT_TIME_SEC;
373 mark_inode_dirty(inode);
374out:
375 mutex_unlock(&sbi->vh_mutex);
376 return res;
377}
378
379static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry)
380{
381 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
382 struct inode *inode = dentry->d_inode;
383 int res;
384
385 if (inode->i_size != 2)
386 return -ENOTEMPTY;
387
388 mutex_lock(&sbi->vh_mutex);
389 res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
390 if (res)
391 goto out;
392 clear_nlink(inode);
393 inode->i_ctime = CURRENT_TIME_SEC;
394 hfsplus_delete_inode(inode);
395 mark_inode_dirty(inode);
396out:
397 mutex_unlock(&sbi->vh_mutex);
398 return res;
399}
400
401static int hfsplus_symlink(struct inode *dir, struct dentry *dentry,
402 const char *symname)
403{
404 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
405 struct inode *inode;
406 int res = -ENOSPC;
407
408 mutex_lock(&sbi->vh_mutex);
409 inode = hfsplus_new_inode(dir->i_sb, S_IFLNK | S_IRWXUGO);
410 if (!inode)
411 goto out;
412
413 res = page_symlink(inode, symname, strlen(symname) + 1);
414 if (res)
415 goto out_err;
416
417 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
418 if (res)
419 goto out_err;
420
421 res = hfsplus_init_inode_security(inode, dir, &dentry->d_name);
422 if (res == -EOPNOTSUPP)
423 res = 0;
424 else if (res) {
425
426 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
427 goto out_err;
428 }
429
430 hfsplus_instantiate(dentry, inode, inode->i_ino);
431 mark_inode_dirty(inode);
432 goto out;
433
434out_err:
435 clear_nlink(inode);
436 hfsplus_delete_inode(inode);
437 iput(inode);
438out:
439 mutex_unlock(&sbi->vh_mutex);
440 return res;
441}
442
443static int hfsplus_mknod(struct inode *dir, struct dentry *dentry,
444 umode_t mode, dev_t rdev)
445{
446 struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
447 struct inode *inode;
448 int res = -ENOSPC;
449
450 mutex_lock(&sbi->vh_mutex);
451 inode = hfsplus_new_inode(dir->i_sb, mode);
452 if (!inode)
453 goto out;
454
455 if (S_ISBLK(mode) || S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode))
456 init_special_inode(inode, mode, rdev);
457
458 res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode);
459 if (res)
460 goto failed_mknod;
461
462 res = hfsplus_init_inode_security(inode, dir, &dentry->d_name);
463 if (res == -EOPNOTSUPP)
464 res = 0;
465 else if (res) {
466
467 hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name);
468 goto failed_mknod;
469 }
470
471 hfsplus_instantiate(dentry, inode, inode->i_ino);
472 mark_inode_dirty(inode);
473 goto out;
474
475failed_mknod:
476 clear_nlink(inode);
477 hfsplus_delete_inode(inode);
478 iput(inode);
479out:
480 mutex_unlock(&sbi->vh_mutex);
481 return res;
482}
483
484static int hfsplus_create(struct inode *dir, struct dentry *dentry, umode_t mode,
485 bool excl)
486{
487 return hfsplus_mknod(dir, dentry, mode, 0);
488}
489
490static int hfsplus_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
491{
492 return hfsplus_mknod(dir, dentry, mode | S_IFDIR, 0);
493}
494
495static int hfsplus_rename(struct inode *old_dir, struct dentry *old_dentry,
496 struct inode *new_dir, struct dentry *new_dentry)
497{
498 int res;
499
500
501 if (new_dentry->d_inode) {
502 if (S_ISDIR(new_dentry->d_inode->i_mode))
503 res = hfsplus_rmdir(new_dir, new_dentry);
504 else
505 res = hfsplus_unlink(new_dir, new_dentry);
506 if (res)
507 return res;
508 }
509
510 res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata,
511 old_dir, &old_dentry->d_name,
512 new_dir, &new_dentry->d_name);
513 if (!res)
514 new_dentry->d_fsdata = old_dentry->d_fsdata;
515 return res;
516}
517
518const struct inode_operations hfsplus_dir_inode_operations = {
519 .lookup = hfsplus_lookup,
520 .create = hfsplus_create,
521 .link = hfsplus_link,
522 .unlink = hfsplus_unlink,
523 .mkdir = hfsplus_mkdir,
524 .rmdir = hfsplus_rmdir,
525 .symlink = hfsplus_symlink,
526 .mknod = hfsplus_mknod,
527 .rename = hfsplus_rename,
528 .setxattr = generic_setxattr,
529 .getxattr = generic_getxattr,
530 .listxattr = hfsplus_listxattr,
531 .removexattr = hfsplus_removexattr,
532};
533
534const struct file_operations hfsplus_dir_operations = {
535 .fsync = hfsplus_file_fsync,
536 .read = generic_read_dir,
537 .iterate = hfsplus_readdir,
538 .unlocked_ioctl = hfsplus_ioctl,
539 .llseek = generic_file_llseek,
540 .release = hfsplus_dir_release,
541};
542
