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