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TOMOYO Linux Cross Reference
Linux/fs/hfsplus/catalog.c

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  1 /*
  2  *  linux/fs/hfsplus/catalog.c
  3  *
  4  * Copyright (C) 2001
  5  * Brad Boyer (flar@allandria.com)
  6  * (C) 2003 Ardis Technologies <roman@ardistech.com>
  7  *
  8  * Handling of catalog records
  9  */
 10 
 11 
 12 #include "hfsplus_fs.h"
 13 #include "hfsplus_raw.h"
 14 
 15 int hfsplus_cat_case_cmp_key(const hfsplus_btree_key *k1,
 16                              const hfsplus_btree_key *k2)
 17 {
 18         __be32 k1p, k2p;
 19 
 20         k1p = k1->cat.parent;
 21         k2p = k2->cat.parent;
 22         if (k1p != k2p)
 23                 return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
 24 
 25         return hfsplus_strcasecmp(&k1->cat.name, &k2->cat.name);
 26 }
 27 
 28 int hfsplus_cat_bin_cmp_key(const hfsplus_btree_key *k1,
 29                             const hfsplus_btree_key *k2)
 30 {
 31         __be32 k1p, k2p;
 32 
 33         k1p = k1->cat.parent;
 34         k2p = k2->cat.parent;
 35         if (k1p != k2p)
 36                 return be32_to_cpu(k1p) < be32_to_cpu(k2p) ? -1 : 1;
 37 
 38         return hfsplus_strcmp(&k1->cat.name, &k2->cat.name);
 39 }
 40 
 41 void hfsplus_cat_build_key(struct super_block *sb, hfsplus_btree_key *key,
 42                            u32 parent, struct qstr *str)
 43 {
 44         int len;
 45 
 46         key->cat.parent = cpu_to_be32(parent);
 47         if (str) {
 48                 hfsplus_asc2uni(sb, &key->cat.name, HFSPLUS_MAX_STRLEN,
 49                                         str->name, str->len);
 50                 len = be16_to_cpu(key->cat.name.length);
 51         } else {
 52                 key->cat.name.length = 0;
 53                 len = 0;
 54         }
 55         key->key_len = cpu_to_be16(6 + 2 * len);
 56 }
 57 
 58 static void hfsplus_cat_build_key_uni(hfsplus_btree_key *key, u32 parent,
 59                                       struct hfsplus_unistr *name)
 60 {
 61         int ustrlen;
 62 
 63         ustrlen = be16_to_cpu(name->length);
 64         key->cat.parent = cpu_to_be32(parent);
 65         key->cat.name.length = cpu_to_be16(ustrlen);
 66         ustrlen *= 2;
 67         memcpy(key->cat.name.unicode, name->unicode, ustrlen);
 68         key->key_len = cpu_to_be16(6 + ustrlen);
 69 }
 70 
 71 void hfsplus_cat_set_perms(struct inode *inode, struct hfsplus_perm *perms)
 72 {
 73         if (inode->i_flags & S_IMMUTABLE)
 74                 perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
 75         else
 76                 perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
 77         if (inode->i_flags & S_APPEND)
 78                 perms->rootflags |= HFSPLUS_FLG_APPEND;
 79         else
 80                 perms->rootflags &= ~HFSPLUS_FLG_APPEND;
 81 
 82         perms->userflags = HFSPLUS_I(inode)->userflags;
 83         perms->mode = cpu_to_be16(inode->i_mode);
 84         perms->owner = cpu_to_be32(i_uid_read(inode));
 85         perms->group = cpu_to_be32(i_gid_read(inode));
 86 
 87         if (S_ISREG(inode->i_mode))
 88                 perms->dev = cpu_to_be32(inode->i_nlink);
 89         else if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode))
 90                 perms->dev = cpu_to_be32(inode->i_rdev);
 91         else
 92                 perms->dev = 0;
 93 }
 94 
 95 static int hfsplus_cat_build_record(hfsplus_cat_entry *entry,
 96                 u32 cnid, struct inode *inode)
 97 {
 98         struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
 99 
100         if (S_ISDIR(inode->i_mode)) {
101                 struct hfsplus_cat_folder *folder;
102 
103                 folder = &entry->folder;
104                 memset(folder, 0, sizeof(*folder));
105                 folder->type = cpu_to_be16(HFSPLUS_FOLDER);
106                 if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags))
107                         folder->flags |= cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT);
108                 folder->id = cpu_to_be32(inode->i_ino);
109                 HFSPLUS_I(inode)->create_date =
110                         folder->create_date =
111                         folder->content_mod_date =
112                         folder->attribute_mod_date =
113                         folder->access_date = hfsp_now2mt();
114                 hfsplus_cat_set_perms(inode, &folder->permissions);
115                 if (inode == sbi->hidden_dir)
116                         /* invisible and namelocked */
117                         folder->user_info.frFlags = cpu_to_be16(0x5000);
118                 return sizeof(*folder);
119         } else {
120                 struct hfsplus_cat_file *file;
121 
122                 file = &entry->file;
123                 memset(file, 0, sizeof(*file));
124                 file->type = cpu_to_be16(HFSPLUS_FILE);
125                 file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
126                 file->id = cpu_to_be32(cnid);
127                 HFSPLUS_I(inode)->create_date =
128                         file->create_date =
129                         file->content_mod_date =
130                         file->attribute_mod_date =
131                         file->access_date = hfsp_now2mt();
132                 if (cnid == inode->i_ino) {
133                         hfsplus_cat_set_perms(inode, &file->permissions);
134                         if (S_ISLNK(inode->i_mode)) {
135                                 file->user_info.fdType =
136                                         cpu_to_be32(HFSP_SYMLINK_TYPE);
137                                 file->user_info.fdCreator =
138                                         cpu_to_be32(HFSP_SYMLINK_CREATOR);
139                         } else {
140                                 file->user_info.fdType =
141                                         cpu_to_be32(sbi->type);
142                                 file->user_info.fdCreator =
143                                         cpu_to_be32(sbi->creator);
144                         }
145                         if (HFSPLUS_FLG_IMMUTABLE &
146                                         (file->permissions.rootflags |
147                                         file->permissions.userflags))
148                                 file->flags |=
149                                         cpu_to_be16(HFSPLUS_FILE_LOCKED);
150                 } else {
151                         file->user_info.fdType =
152                                 cpu_to_be32(HFSP_HARDLINK_TYPE);
153                         file->user_info.fdCreator =
154                                 cpu_to_be32(HFSP_HFSPLUS_CREATOR);
155                         file->user_info.fdFlags =
156                                 cpu_to_be16(0x100);
157                         file->create_date =
158                                 HFSPLUS_I(sbi->hidden_dir)->create_date;
159                         file->permissions.dev =
160                                 cpu_to_be32(HFSPLUS_I(inode)->linkid);
161                 }
162                 return sizeof(*file);
163         }
164 }
165 
166 static int hfsplus_fill_cat_thread(struct super_block *sb,
167                                    hfsplus_cat_entry *entry, int type,
168                                    u32 parentid, struct qstr *str)
169 {
170         entry->type = cpu_to_be16(type);
171         entry->thread.reserved = 0;
172         entry->thread.parentID = cpu_to_be32(parentid);
173         hfsplus_asc2uni(sb, &entry->thread.nodeName, HFSPLUS_MAX_STRLEN,
174                                 str->name, str->len);
175         return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
176 }
177 
178 /* Try to get a catalog entry for given catalog id */
179 int hfsplus_find_cat(struct super_block *sb, u32 cnid,
180                      struct hfs_find_data *fd)
181 {
182         hfsplus_cat_entry tmp;
183         int err;
184         u16 type;
185 
186         hfsplus_cat_build_key(sb, fd->search_key, cnid, NULL);
187         err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
188         if (err)
189                 return err;
190 
191         type = be16_to_cpu(tmp.type);
192         if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
193                 pr_err("found bad thread record in catalog\n");
194                 return -EIO;
195         }
196 
197         if (be16_to_cpu(tmp.thread.nodeName.length) > 255) {
198                 pr_err("catalog name length corrupted\n");
199                 return -EIO;
200         }
201 
202         hfsplus_cat_build_key_uni(fd->search_key,
203                 be32_to_cpu(tmp.thread.parentID),
204                 &tmp.thread.nodeName);
205         return hfs_brec_find(fd, hfs_find_rec_by_key);
206 }
207 
208 static void hfsplus_subfolders_inc(struct inode *dir)
209 {
210         struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
211 
212         if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
213                 /*
214                  * Increment subfolder count. Note, the value is only meaningful
215                  * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
216                  */
217                 HFSPLUS_I(dir)->subfolders++;
218         }
219 }
220 
221 static void hfsplus_subfolders_dec(struct inode *dir)
222 {
223         struct hfsplus_sb_info *sbi = HFSPLUS_SB(dir->i_sb);
224 
225         if (test_bit(HFSPLUS_SB_HFSX, &sbi->flags)) {
226                 /*
227                  * Decrement subfolder count. Note, the value is only meaningful
228                  * for folders with HFSPLUS_HAS_FOLDER_COUNT flag set.
229                  *
230                  * Check for zero. Some subfolders may have been created
231                  * by an implementation ignorant of this counter.
232                  */
233                 if (HFSPLUS_I(dir)->subfolders)
234                         HFSPLUS_I(dir)->subfolders--;
235         }
236 }
237 
238 int hfsplus_create_cat(u32 cnid, struct inode *dir,
239                 struct qstr *str, struct inode *inode)
240 {
241         struct super_block *sb = dir->i_sb;
242         struct hfs_find_data fd;
243         hfsplus_cat_entry entry;
244         int entry_size;
245         int err;
246 
247         hfs_dbg(CAT_MOD, "create_cat: %s,%u(%d)\n",
248                 str->name, cnid, inode->i_nlink);
249         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
250         if (err)
251                 return err;
252 
253         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
254         entry_size = hfsplus_fill_cat_thread(sb, &entry,
255                 S_ISDIR(inode->i_mode) ?
256                         HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
257                 dir->i_ino, str);
258         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
259         if (err != -ENOENT) {
260                 if (!err)
261                         err = -EEXIST;
262                 goto err2;
263         }
264         err = hfs_brec_insert(&fd, &entry, entry_size);
265         if (err)
266                 goto err2;
267 
268         hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
269         entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
270         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
271         if (err != -ENOENT) {
272                 /* panic? */
273                 if (!err)
274                         err = -EEXIST;
275                 goto err1;
276         }
277         err = hfs_brec_insert(&fd, &entry, entry_size);
278         if (err)
279                 goto err1;
280 
281         dir->i_size++;
282         if (S_ISDIR(inode->i_mode))
283                 hfsplus_subfolders_inc(dir);
284         dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
285         hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
286 
287         hfs_find_exit(&fd);
288         return 0;
289 
290 err1:
291         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
292         if (!hfs_brec_find(&fd, hfs_find_rec_by_key))
293                 hfs_brec_remove(&fd);
294 err2:
295         hfs_find_exit(&fd);
296         return err;
297 }
298 
299 int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
300 {
301         struct super_block *sb = dir->i_sb;
302         struct hfs_find_data fd;
303         struct hfsplus_fork_raw fork;
304         struct list_head *pos;
305         int err, off;
306         u16 type;
307 
308         hfs_dbg(CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
309         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
310         if (err)
311                 return err;
312 
313         if (!str) {
314                 int len;
315 
316                 hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
317                 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
318                 if (err)
319                         goto out;
320 
321                 off = fd.entryoffset +
322                         offsetof(struct hfsplus_cat_thread, nodeName);
323                 fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
324                 hfs_bnode_read(fd.bnode,
325                         &fd.search_key->cat.name.length, off, 2);
326                 len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
327                 hfs_bnode_read(fd.bnode,
328                         &fd.search_key->cat.name.unicode,
329                         off + 2, len);
330                 fd.search_key->key_len = cpu_to_be16(6 + len);
331         } else
332                 hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
333 
334         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
335         if (err)
336                 goto out;
337 
338         type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
339         if (type == HFSPLUS_FILE) {
340 #if 0
341                 off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
342                 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
343                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
344 #endif
345 
346                 off = fd.entryoffset +
347                         offsetof(struct hfsplus_cat_file, rsrc_fork);
348                 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
349                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
350         }
351 
352         list_for_each(pos, &HFSPLUS_I(dir)->open_dir_list) {
353                 struct hfsplus_readdir_data *rd =
354                         list_entry(pos, struct hfsplus_readdir_data, list);
355                 if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
356                         rd->file->f_pos--;
357         }
358 
359         err = hfs_brec_remove(&fd);
360         if (err)
361                 goto out;
362 
363         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
364         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
365         if (err)
366                 goto out;
367 
368         err = hfs_brec_remove(&fd);
369         if (err)
370                 goto out;
371 
372         dir->i_size--;
373         if (type == HFSPLUS_FOLDER)
374                 hfsplus_subfolders_dec(dir);
375         dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
376         hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
377 
378         if (type == HFSPLUS_FILE || type == HFSPLUS_FOLDER) {
379                 if (HFSPLUS_SB(sb)->attr_tree)
380                         hfsplus_delete_all_attrs(dir, cnid);
381         }
382 
383 out:
384         hfs_find_exit(&fd);
385 
386         return err;
387 }
388 
389 int hfsplus_rename_cat(u32 cnid,
390                        struct inode *src_dir, struct qstr *src_name,
391                        struct inode *dst_dir, struct qstr *dst_name)
392 {
393         struct super_block *sb = src_dir->i_sb;
394         struct hfs_find_data src_fd, dst_fd;
395         hfsplus_cat_entry entry;
396         int entry_size, type;
397         int err;
398 
399         hfs_dbg(CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n",
400                 cnid, src_dir->i_ino, src_name->name,
401                 dst_dir->i_ino, dst_name->name);
402         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd);
403         if (err)
404                 return err;
405         dst_fd = src_fd;
406 
407         /* find the old dir entry and read the data */
408         hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
409         err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
410         if (err)
411                 goto out;
412         if (src_fd.entrylength > sizeof(entry) || src_fd.entrylength < 0) {
413                 err = -EIO;
414                 goto out;
415         }
416 
417         hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
418                                 src_fd.entrylength);
419         type = be16_to_cpu(entry.type);
420 
421         /* create new dir entry with the data from the old entry */
422         hfsplus_cat_build_key(sb, dst_fd.search_key, dst_dir->i_ino, dst_name);
423         err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
424         if (err != -ENOENT) {
425                 if (!err)
426                         err = -EEXIST;
427                 goto out;
428         }
429 
430         err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
431         if (err)
432                 goto out;
433         dst_dir->i_size++;
434         if (type == HFSPLUS_FOLDER)
435                 hfsplus_subfolders_inc(dst_dir);
436         dst_dir->i_mtime = dst_dir->i_ctime = CURRENT_TIME_SEC;
437 
438         /* finally remove the old entry */
439         hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
440         err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
441         if (err)
442                 goto out;
443         err = hfs_brec_remove(&src_fd);
444         if (err)
445                 goto out;
446         src_dir->i_size--;
447         if (type == HFSPLUS_FOLDER)
448                 hfsplus_subfolders_dec(src_dir);
449         src_dir->i_mtime = src_dir->i_ctime = CURRENT_TIME_SEC;
450 
451         /* remove old thread entry */
452         hfsplus_cat_build_key(sb, src_fd.search_key, cnid, NULL);
453         err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
454         if (err)
455                 goto out;
456         type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
457         err = hfs_brec_remove(&src_fd);
458         if (err)
459                 goto out;
460 
461         /* create new thread entry */
462         hfsplus_cat_build_key(sb, dst_fd.search_key, cnid, NULL);
463         entry_size = hfsplus_fill_cat_thread(sb, &entry, type,
464                 dst_dir->i_ino, dst_name);
465         err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
466         if (err != -ENOENT) {
467                 if (!err)
468                         err = -EEXIST;
469                 goto out;
470         }
471         err = hfs_brec_insert(&dst_fd, &entry, entry_size);
472 
473         hfsplus_mark_inode_dirty(dst_dir, HFSPLUS_I_CAT_DIRTY);
474         hfsplus_mark_inode_dirty(src_dir, HFSPLUS_I_CAT_DIRTY);
475 out:
476         hfs_bnode_put(dst_fd.bnode);
477         hfs_find_exit(&src_fd);
478         return err;
479 }
480 

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