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