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