Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/hfsplus/dir.c | |
3 | * | |
4 | * Copyright (C) 2001 | |
5 | * Brad Boyer (flar@allandria.com) | |
6 | * (C) 2003 Ardis Technologies <roman@ardistech.com> | |
7 | * | |
8 | * Handling of directories | |
9 | */ | |
10 | ||
11 | #include <linux/errno.h> | |
12 | #include <linux/fs.h> | |
1da177e4 LT |
13 | #include <linux/slab.h> |
14 | #include <linux/random.h> | |
1da177e4 LT |
15 | |
16 | #include "hfsplus_fs.h" | |
17 | #include "hfsplus_raw.h" | |
18 | ||
19 | static inline void hfsplus_instantiate(struct dentry *dentry, | |
20 | struct inode *inode, u32 cnid) | |
21 | { | |
22 | dentry->d_fsdata = (void *)(unsigned long)cnid; | |
23 | d_instantiate(dentry, inode); | |
24 | } | |
25 | ||
26 | /* Find the entry inside dir named dentry->d_name */ | |
27 | static struct dentry *hfsplus_lookup(struct inode *dir, struct dentry *dentry, | |
28 | struct nameidata *nd) | |
29 | { | |
30 | struct inode *inode = NULL; | |
31 | struct hfs_find_data fd; | |
32 | struct super_block *sb; | |
33 | hfsplus_cat_entry entry; | |
34 | int err; | |
35 | u32 cnid, linkid = 0; | |
36 | u16 type; | |
37 | ||
38 | sb = dir->i_sb; | |
d45bce8f DG |
39 | |
40 | dentry->d_op = &hfsplus_dentry_operations; | |
1da177e4 LT |
41 | dentry->d_fsdata = NULL; |
42 | hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd); | |
43 | hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, &dentry->d_name); | |
44 | again: | |
45 | err = hfs_brec_read(&fd, &entry, sizeof(entry)); | |
46 | if (err) { | |
47 | if (err == -ENOENT) { | |
48 | hfs_find_exit(&fd); | |
49 | /* No such entry */ | |
50 | inode = NULL; | |
51 | goto out; | |
52 | } | |
53 | goto fail; | |
54 | } | |
55 | type = be16_to_cpu(entry.type); | |
56 | if (type == HFSPLUS_FOLDER) { | |
57 | if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) { | |
58 | err = -EIO; | |
59 | goto fail; | |
60 | } | |
61 | cnid = be32_to_cpu(entry.folder.id); | |
62 | dentry->d_fsdata = (void *)(unsigned long)cnid; | |
63 | } else if (type == HFSPLUS_FILE) { | |
64 | if (fd.entrylength < sizeof(struct hfsplus_cat_file)) { | |
65 | err = -EIO; | |
66 | goto fail; | |
67 | } | |
68 | cnid = be32_to_cpu(entry.file.id); | |
69 | if (entry.file.user_info.fdType == cpu_to_be32(HFSP_HARDLINK_TYPE) && | |
af8c85bb RZ |
70 | entry.file.user_info.fdCreator == cpu_to_be32(HFSP_HFSPLUS_CREATOR) && |
71 | (entry.file.create_date == HFSPLUS_I(HFSPLUS_SB(sb).hidden_dir).create_date || | |
72 | entry.file.create_date == HFSPLUS_I(sb->s_root->d_inode).create_date) && | |
73 | HFSPLUS_SB(sb).hidden_dir) { | |
1da177e4 LT |
74 | struct qstr str; |
75 | char name[32]; | |
76 | ||
77 | if (dentry->d_fsdata) { | |
af8c85bb RZ |
78 | /* |
79 | * We found a link pointing to another link, | |
80 | * so ignore it and treat it as regular file. | |
81 | */ | |
82 | cnid = (unsigned long)dentry->d_fsdata; | |
83 | linkid = 0; | |
84 | } else { | |
85 | dentry->d_fsdata = (void *)(unsigned long)cnid; | |
86 | linkid = be32_to_cpu(entry.file.permissions.dev); | |
87 | str.len = sprintf(name, "iNode%d", linkid); | |
88 | str.name = name; | |
89 | hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_SB(sb).hidden_dir->i_ino, &str); | |
90 | goto again; | |
1da177e4 | 91 | } |
1da177e4 LT |
92 | } else if (!dentry->d_fsdata) |
93 | dentry->d_fsdata = (void *)(unsigned long)cnid; | |
94 | } else { | |
634725a9 | 95 | printk(KERN_ERR "hfs: invalid catalog entry type in lookup\n"); |
1da177e4 LT |
96 | err = -EIO; |
97 | goto fail; | |
98 | } | |
99 | hfs_find_exit(&fd); | |
63525391 DH |
100 | inode = hfsplus_iget(dir->i_sb, cnid); |
101 | if (IS_ERR(inode)) | |
102 | return ERR_CAST(inode); | |
1da177e4 LT |
103 | if (S_ISREG(inode->i_mode)) |
104 | HFSPLUS_I(inode).dev = linkid; | |
105 | out: | |
106 | d_add(dentry, inode); | |
107 | return NULL; | |
108 | fail: | |
109 | hfs_find_exit(&fd); | |
110 | return ERR_PTR(err); | |
111 | } | |
112 | ||
113 | static int hfsplus_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
114 | { | |
f44ea031 | 115 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
116 | struct super_block *sb = inode->i_sb; |
117 | int len, err; | |
118 | char strbuf[HFSPLUS_MAX_STRLEN + 1]; | |
119 | hfsplus_cat_entry entry; | |
120 | struct hfs_find_data fd; | |
121 | struct hfsplus_readdir_data *rd; | |
122 | u16 type; | |
123 | ||
124 | if (filp->f_pos >= inode->i_size) | |
125 | return 0; | |
126 | ||
127 | hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd); | |
128 | hfsplus_cat_build_key(sb, fd.search_key, inode->i_ino, NULL); | |
129 | err = hfs_brec_find(&fd); | |
130 | if (err) | |
131 | goto out; | |
132 | ||
133 | switch ((u32)filp->f_pos) { | |
134 | case 0: | |
135 | /* This is completely artificial... */ | |
136 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR)) | |
137 | goto out; | |
138 | filp->f_pos++; | |
139 | /* fall through */ | |
140 | case 1: | |
141 | hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength); | |
142 | if (be16_to_cpu(entry.type) != HFSPLUS_FOLDER_THREAD) { | |
634725a9 | 143 | printk(KERN_ERR "hfs: bad catalog folder thread\n"); |
1da177e4 LT |
144 | err = -EIO; |
145 | goto out; | |
146 | } | |
147 | if (fd.entrylength < HFSPLUS_MIN_THREAD_SZ) { | |
634725a9 | 148 | printk(KERN_ERR "hfs: truncated catalog thread\n"); |
1da177e4 LT |
149 | err = -EIO; |
150 | goto out; | |
151 | } | |
152 | if (filldir(dirent, "..", 2, 1, | |
153 | be32_to_cpu(entry.thread.parentID), DT_DIR)) | |
154 | goto out; | |
155 | filp->f_pos++; | |
156 | /* fall through */ | |
157 | default: | |
158 | if (filp->f_pos >= inode->i_size) | |
159 | goto out; | |
160 | err = hfs_brec_goto(&fd, filp->f_pos - 1); | |
161 | if (err) | |
162 | goto out; | |
163 | } | |
164 | ||
165 | for (;;) { | |
166 | if (be32_to_cpu(fd.key->cat.parent) != inode->i_ino) { | |
634725a9 | 167 | printk(KERN_ERR "hfs: walked past end of dir\n"); |
1da177e4 LT |
168 | err = -EIO; |
169 | goto out; | |
170 | } | |
171 | hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength); | |
172 | type = be16_to_cpu(entry.type); | |
173 | len = HFSPLUS_MAX_STRLEN; | |
174 | err = hfsplus_uni2asc(sb, &fd.key->cat.name, strbuf, &len); | |
175 | if (err) | |
176 | goto out; | |
177 | if (type == HFSPLUS_FOLDER) { | |
178 | if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) { | |
634725a9 | 179 | printk(KERN_ERR "hfs: small dir entry\n"); |
1da177e4 LT |
180 | err = -EIO; |
181 | goto out; | |
182 | } | |
183 | if (HFSPLUS_SB(sb).hidden_dir && | |
184 | HFSPLUS_SB(sb).hidden_dir->i_ino == be32_to_cpu(entry.folder.id)) | |
185 | goto next; | |
186 | if (filldir(dirent, strbuf, len, filp->f_pos, | |
187 | be32_to_cpu(entry.folder.id), DT_DIR)) | |
188 | break; | |
189 | } else if (type == HFSPLUS_FILE) { | |
190 | if (fd.entrylength < sizeof(struct hfsplus_cat_file)) { | |
634725a9 | 191 | printk(KERN_ERR "hfs: small file entry\n"); |
1da177e4 LT |
192 | err = -EIO; |
193 | goto out; | |
194 | } | |
195 | if (filldir(dirent, strbuf, len, filp->f_pos, | |
196 | be32_to_cpu(entry.file.id), DT_REG)) | |
197 | break; | |
198 | } else { | |
634725a9 | 199 | printk(KERN_ERR "hfs: bad catalog entry type\n"); |
1da177e4 LT |
200 | err = -EIO; |
201 | goto out; | |
202 | } | |
203 | next: | |
204 | filp->f_pos++; | |
205 | if (filp->f_pos >= inode->i_size) | |
206 | goto out; | |
207 | err = hfs_brec_goto(&fd, 1); | |
208 | if (err) | |
209 | goto out; | |
210 | } | |
211 | rd = filp->private_data; | |
212 | if (!rd) { | |
213 | rd = kmalloc(sizeof(struct hfsplus_readdir_data), GFP_KERNEL); | |
214 | if (!rd) { | |
215 | err = -ENOMEM; | |
216 | goto out; | |
217 | } | |
218 | filp->private_data = rd; | |
219 | rd->file = filp; | |
220 | list_add(&rd->list, &HFSPLUS_I(inode).open_dir_list); | |
221 | } | |
222 | memcpy(&rd->key, fd.key, sizeof(struct hfsplus_cat_key)); | |
223 | out: | |
224 | hfs_find_exit(&fd); | |
225 | return err; | |
226 | } | |
227 | ||
228 | static int hfsplus_dir_release(struct inode *inode, struct file *file) | |
229 | { | |
230 | struct hfsplus_readdir_data *rd = file->private_data; | |
231 | if (rd) { | |
232 | list_del(&rd->list); | |
233 | kfree(rd); | |
234 | } | |
235 | return 0; | |
236 | } | |
237 | ||
238 | static int hfsplus_create(struct inode *dir, struct dentry *dentry, int mode, | |
239 | struct nameidata *nd) | |
240 | { | |
241 | struct inode *inode; | |
242 | int res; | |
243 | ||
244 | inode = hfsplus_new_inode(dir->i_sb, mode); | |
245 | if (!inode) | |
246 | return -ENOSPC; | |
247 | ||
248 | res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode); | |
249 | if (res) { | |
250 | inode->i_nlink = 0; | |
251 | hfsplus_delete_inode(inode); | |
252 | iput(inode); | |
253 | return res; | |
254 | } | |
255 | hfsplus_instantiate(dentry, inode, inode->i_ino); | |
256 | mark_inode_dirty(inode); | |
257 | return 0; | |
258 | } | |
259 | ||
260 | static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir, | |
261 | struct dentry *dst_dentry) | |
262 | { | |
263 | struct super_block *sb = dst_dir->i_sb; | |
264 | struct inode *inode = src_dentry->d_inode; | |
265 | struct inode *src_dir = src_dentry->d_parent->d_inode; | |
266 | struct qstr str; | |
267 | char name[32]; | |
268 | u32 cnid, id; | |
269 | int res; | |
270 | ||
271 | if (HFSPLUS_IS_RSRC(inode)) | |
272 | return -EPERM; | |
273 | ||
274 | if (inode->i_ino == (u32)(unsigned long)src_dentry->d_fsdata) { | |
275 | for (;;) { | |
276 | get_random_bytes(&id, sizeof(cnid)); | |
277 | id &= 0x3fffffff; | |
278 | str.name = name; | |
279 | str.len = sprintf(name, "iNode%d", id); | |
280 | res = hfsplus_rename_cat(inode->i_ino, | |
281 | src_dir, &src_dentry->d_name, | |
282 | HFSPLUS_SB(sb).hidden_dir, &str); | |
283 | if (!res) | |
284 | break; | |
285 | if (res != -EEXIST) | |
286 | return res; | |
287 | } | |
288 | HFSPLUS_I(inode).dev = id; | |
289 | cnid = HFSPLUS_SB(sb).next_cnid++; | |
290 | src_dentry->d_fsdata = (void *)(unsigned long)cnid; | |
291 | res = hfsplus_create_cat(cnid, src_dir, &src_dentry->d_name, inode); | |
292 | if (res) | |
293 | /* panic? */ | |
294 | return res; | |
295 | HFSPLUS_SB(sb).file_count++; | |
296 | } | |
297 | cnid = HFSPLUS_SB(sb).next_cnid++; | |
298 | res = hfsplus_create_cat(cnid, dst_dir, &dst_dentry->d_name, inode); | |
299 | if (res) | |
300 | return res; | |
301 | ||
d8c76e6f | 302 | inc_nlink(inode); |
1da177e4 LT |
303 | hfsplus_instantiate(dst_dentry, inode, cnid); |
304 | atomic_inc(&inode->i_count); | |
305 | inode->i_ctime = CURRENT_TIME_SEC; | |
306 | mark_inode_dirty(inode); | |
307 | HFSPLUS_SB(sb).file_count++; | |
308 | sb->s_dirt = 1; | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
313 | static int hfsplus_unlink(struct inode *dir, struct dentry *dentry) | |
314 | { | |
315 | struct super_block *sb = dir->i_sb; | |
316 | struct inode *inode = dentry->d_inode; | |
317 | struct qstr str; | |
318 | char name[32]; | |
319 | u32 cnid; | |
320 | int res; | |
321 | ||
322 | if (HFSPLUS_IS_RSRC(inode)) | |
323 | return -EPERM; | |
324 | ||
325 | cnid = (u32)(unsigned long)dentry->d_fsdata; | |
326 | if (inode->i_ino == cnid && | |
327 | atomic_read(&HFSPLUS_I(inode).opencnt)) { | |
328 | str.name = name; | |
329 | str.len = sprintf(name, "temp%lu", inode->i_ino); | |
330 | res = hfsplus_rename_cat(inode->i_ino, | |
331 | dir, &dentry->d_name, | |
332 | HFSPLUS_SB(sb).hidden_dir, &str); | |
333 | if (!res) | |
334 | inode->i_flags |= S_DEAD; | |
335 | return res; | |
336 | } | |
337 | res = hfsplus_delete_cat(cnid, dir, &dentry->d_name); | |
338 | if (res) | |
339 | return res; | |
340 | ||
af8c85bb | 341 | if (inode->i_nlink > 0) |
9a53c3a7 | 342 | drop_nlink(inode); |
76b0c26a RZ |
343 | if (inode->i_ino == cnid) |
344 | clear_nlink(inode); | |
345 | if (!inode->i_nlink) { | |
346 | if (inode->i_ino != cnid) { | |
347 | HFSPLUS_SB(sb).file_count--; | |
348 | if (!atomic_read(&HFSPLUS_I(inode).opencnt)) { | |
349 | res = hfsplus_delete_cat(inode->i_ino, | |
350 | HFSPLUS_SB(sb).hidden_dir, | |
351 | NULL); | |
352 | if (!res) | |
353 | hfsplus_delete_inode(inode); | |
354 | } else | |
355 | inode->i_flags |= S_DEAD; | |
1da177e4 | 356 | } else |
76b0c26a | 357 | hfsplus_delete_inode(inode); |
af8c85bb | 358 | } else |
76b0c26a | 359 | HFSPLUS_SB(sb).file_count--; |
1da177e4 LT |
360 | inode->i_ctime = CURRENT_TIME_SEC; |
361 | mark_inode_dirty(inode); | |
362 | ||
363 | return res; | |
364 | } | |
365 | ||
366 | static int hfsplus_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
367 | { | |
368 | struct inode *inode; | |
369 | int res; | |
370 | ||
371 | inode = hfsplus_new_inode(dir->i_sb, S_IFDIR | mode); | |
372 | if (!inode) | |
373 | return -ENOSPC; | |
374 | ||
375 | res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode); | |
376 | if (res) { | |
377 | inode->i_nlink = 0; | |
378 | hfsplus_delete_inode(inode); | |
379 | iput(inode); | |
380 | return res; | |
381 | } | |
382 | hfsplus_instantiate(dentry, inode, inode->i_ino); | |
383 | mark_inode_dirty(inode); | |
384 | return 0; | |
385 | } | |
386 | ||
387 | static int hfsplus_rmdir(struct inode *dir, struct dentry *dentry) | |
388 | { | |
389 | struct inode *inode; | |
390 | int res; | |
391 | ||
392 | inode = dentry->d_inode; | |
393 | if (inode->i_size != 2) | |
394 | return -ENOTEMPTY; | |
395 | res = hfsplus_delete_cat(inode->i_ino, dir, &dentry->d_name); | |
396 | if (res) | |
397 | return res; | |
ce71ec36 | 398 | clear_nlink(inode); |
1da177e4 LT |
399 | inode->i_ctime = CURRENT_TIME_SEC; |
400 | hfsplus_delete_inode(inode); | |
401 | mark_inode_dirty(inode); | |
402 | return 0; | |
403 | } | |
404 | ||
405 | static int hfsplus_symlink(struct inode *dir, struct dentry *dentry, | |
406 | const char *symname) | |
407 | { | |
408 | struct super_block *sb; | |
409 | struct inode *inode; | |
410 | int res; | |
411 | ||
412 | sb = dir->i_sb; | |
413 | inode = hfsplus_new_inode(sb, S_IFLNK | S_IRWXUGO); | |
414 | if (!inode) | |
415 | return -ENOSPC; | |
416 | ||
417 | res = page_symlink(inode, symname, strlen(symname) + 1); | |
418 | if (res) { | |
419 | inode->i_nlink = 0; | |
420 | hfsplus_delete_inode(inode); | |
421 | iput(inode); | |
422 | return res; | |
423 | } | |
424 | ||
425 | mark_inode_dirty(inode); | |
426 | res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode); | |
427 | ||
428 | if (!res) { | |
429 | hfsplus_instantiate(dentry, inode, inode->i_ino); | |
430 | mark_inode_dirty(inode); | |
431 | } | |
432 | ||
433 | return res; | |
434 | } | |
435 | ||
436 | static int hfsplus_mknod(struct inode *dir, struct dentry *dentry, | |
437 | int mode, dev_t rdev) | |
438 | { | |
439 | struct super_block *sb; | |
440 | struct inode *inode; | |
441 | int res; | |
442 | ||
443 | sb = dir->i_sb; | |
444 | inode = hfsplus_new_inode(sb, mode); | |
445 | if (!inode) | |
446 | return -ENOSPC; | |
447 | ||
448 | res = hfsplus_create_cat(inode->i_ino, dir, &dentry->d_name, inode); | |
449 | if (res) { | |
450 | inode->i_nlink = 0; | |
451 | hfsplus_delete_inode(inode); | |
452 | iput(inode); | |
453 | return res; | |
454 | } | |
455 | init_special_inode(inode, mode, rdev); | |
456 | hfsplus_instantiate(dentry, inode, inode->i_ino); | |
457 | mark_inode_dirty(inode); | |
458 | ||
459 | return 0; | |
460 | } | |
461 | ||
462 | static int hfsplus_rename(struct inode *old_dir, struct dentry *old_dentry, | |
463 | struct inode *new_dir, struct dentry *new_dentry) | |
464 | { | |
465 | int res; | |
466 | ||
467 | /* Unlink destination if it already exists */ | |
468 | if (new_dentry->d_inode) { | |
469 | res = hfsplus_unlink(new_dir, new_dentry); | |
470 | if (res) | |
471 | return res; | |
472 | } | |
473 | ||
474 | res = hfsplus_rename_cat((u32)(unsigned long)old_dentry->d_fsdata, | |
475 | old_dir, &old_dentry->d_name, | |
476 | new_dir, &new_dentry->d_name); | |
477 | if (!res) | |
478 | new_dentry->d_fsdata = old_dentry->d_fsdata; | |
479 | return res; | |
480 | } | |
481 | ||
92e1d5be | 482 | const struct inode_operations hfsplus_dir_inode_operations = { |
1da177e4 LT |
483 | .lookup = hfsplus_lookup, |
484 | .create = hfsplus_create, | |
485 | .link = hfsplus_link, | |
486 | .unlink = hfsplus_unlink, | |
487 | .mkdir = hfsplus_mkdir, | |
488 | .rmdir = hfsplus_rmdir, | |
489 | .symlink = hfsplus_symlink, | |
490 | .mknod = hfsplus_mknod, | |
491 | .rename = hfsplus_rename, | |
492 | }; | |
493 | ||
4b6f5d20 | 494 | const struct file_operations hfsplus_dir_operations = { |
1da177e4 LT |
495 | .read = generic_read_dir, |
496 | .readdir = hfsplus_readdir, | |
497 | .ioctl = hfsplus_ioctl, | |
498 | .llseek = generic_file_llseek, | |
499 | .release = hfsplus_dir_release, | |
500 | }; |