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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, str->name, str->len);
 49                 len = be16_to_cpu(key->cat.name.length);
 50         } else {
 51                 key->cat.name.length = 0;
 52                 len = 0;
 53         }
 54         key->key_len = cpu_to_be16(6 + 2 * len);
 55 }
 56 
 57 static void hfsplus_cat_build_key_uni(hfsplus_btree_key *key, u32 parent,
 58                                       struct hfsplus_unistr *name)
 59 {
 60         int ustrlen;
 61 
 62         ustrlen = be16_to_cpu(name->length);
 63         key->cat.parent = cpu_to_be32(parent);
 64         key->cat.name.length = cpu_to_be16(ustrlen);
 65         ustrlen *= 2;
 66         memcpy(key->cat.name.unicode, name->unicode, ustrlen);
 67         key->key_len = cpu_to_be16(6 + ustrlen);
 68 }
 69 
 70 void hfsplus_cat_set_perms(struct inode *inode, struct hfsplus_perm *perms)
 71 {
 72         if (inode->i_flags & S_IMMUTABLE)
 73                 perms->rootflags |= HFSPLUS_FLG_IMMUTABLE;
 74         else
 75                 perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE;
 76         if (inode->i_flags & S_APPEND)
 77                 perms->rootflags |= HFSPLUS_FLG_APPEND;
 78         else
 79                 perms->rootflags &= ~HFSPLUS_FLG_APPEND;
 80 
 81         perms->userflags = HFSPLUS_I(inode)->userflags;
 82         perms->mode = cpu_to_be16(inode->i_mode);
 83         perms->owner = cpu_to_be32(inode->i_uid);
 84         perms->group = cpu_to_be32(inode->i_gid);
 85 
 86         if (S_ISREG(inode->i_mode))
 87                 perms->dev = cpu_to_be32(inode->i_nlink);
 88         else if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode))
 89                 perms->dev = cpu_to_be32(inode->i_rdev);
 90         else
 91                 perms->dev = 0;
 92 }
 93 
 94 static int hfsplus_cat_build_record(hfsplus_cat_entry *entry,
 95                 u32 cnid, struct inode *inode)
 96 {
 97         struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb);
 98 
 99         if (S_ISDIR(inode->i_mode)) {
100                 struct hfsplus_cat_folder *folder;
101 
102                 folder = &entry->folder;
103                 memset(folder, 0, sizeof(*folder));
104                 folder->type = cpu_to_be16(HFSPLUS_FOLDER);
105                 folder->id = cpu_to_be32(inode->i_ino);
106                 HFSPLUS_I(inode)->create_date =
107                         folder->create_date =
108                         folder->content_mod_date =
109                         folder->attribute_mod_date =
110                         folder->access_date = hfsp_now2mt();
111                 hfsplus_cat_set_perms(inode, &folder->permissions);
112                 if (inode == sbi->hidden_dir)
113                         /* invisible and namelocked */
114                         folder->user_info.frFlags = cpu_to_be16(0x5000);
115                 return sizeof(*folder);
116         } else {
117                 struct hfsplus_cat_file *file;
118 
119                 file = &entry->file;
120                 memset(file, 0, sizeof(*file));
121                 file->type = cpu_to_be16(HFSPLUS_FILE);
122                 file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
123                 file->id = cpu_to_be32(cnid);
124                 HFSPLUS_I(inode)->create_date =
125                         file->create_date =
126                         file->content_mod_date =
127                         file->attribute_mod_date =
128                         file->access_date = hfsp_now2mt();
129                 if (cnid == inode->i_ino) {
130                         hfsplus_cat_set_perms(inode, &file->permissions);
131                         if (S_ISLNK(inode->i_mode)) {
132                                 file->user_info.fdType =
133                                         cpu_to_be32(HFSP_SYMLINK_TYPE);
134                                 file->user_info.fdCreator =
135                                         cpu_to_be32(HFSP_SYMLINK_CREATOR);
136                         } else {
137                                 file->user_info.fdType =
138                                         cpu_to_be32(sbi->type);
139                                 file->user_info.fdCreator =
140                                         cpu_to_be32(sbi->creator);
141                         }
142                         if (HFSPLUS_FLG_IMMUTABLE &
143                                         (file->permissions.rootflags |
144                                         file->permissions.userflags))
145                                 file->flags |=
146                                         cpu_to_be16(HFSPLUS_FILE_LOCKED);
147                 } else {
148                         file->user_info.fdType =
149                                 cpu_to_be32(HFSP_HARDLINK_TYPE);
150                         file->user_info.fdCreator =
151                                 cpu_to_be32(HFSP_HFSPLUS_CREATOR);
152                         file->user_info.fdFlags =
153                                 cpu_to_be16(0x100);
154                         file->create_date =
155                                 HFSPLUS_I(sbi->hidden_dir)->create_date;
156                         file->permissions.dev =
157                                 cpu_to_be32(HFSPLUS_I(inode)->linkid);
158                 }
159                 return sizeof(*file);
160         }
161 }
162 
163 static int hfsplus_fill_cat_thread(struct super_block *sb,
164                                    hfsplus_cat_entry *entry, int type,
165                                    u32 parentid, struct qstr *str)
166 {
167         entry->type = cpu_to_be16(type);
168         entry->thread.reserved = 0;
169         entry->thread.parentID = cpu_to_be32(parentid);
170         hfsplus_asc2uni(sb, &entry->thread.nodeName, str->name, str->len);
171         return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
172 }
173 
174 /* Try to get a catalog entry for given catalog id */
175 int hfsplus_find_cat(struct super_block *sb, u32 cnid,
176                      struct hfs_find_data *fd)
177 {
178         hfsplus_cat_entry tmp;
179         int err;
180         u16 type;
181 
182         hfsplus_cat_build_key(sb, fd->search_key, cnid, NULL);
183         err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
184         if (err)
185                 return err;
186 
187         type = be16_to_cpu(tmp.type);
188         if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
189                 printk(KERN_ERR "hfs: found bad thread record in catalog\n");
190                 return -EIO;
191         }
192 
193         if (be16_to_cpu(tmp.thread.nodeName.length) > 255) {
194                 printk(KERN_ERR "hfs: catalog name length corrupted\n");
195                 return -EIO;
196         }
197 
198         hfsplus_cat_build_key_uni(fd->search_key,
199                 be32_to_cpu(tmp.thread.parentID),
200                 &tmp.thread.nodeName);
201         return hfs_brec_find(fd);
202 }
203 
204 int hfsplus_create_cat(u32 cnid, struct inode *dir,
205                 struct qstr *str, struct inode *inode)
206 {
207         struct super_block *sb = dir->i_sb;
208         struct hfs_find_data fd;
209         hfsplus_cat_entry entry;
210         int entry_size;
211         int err;
212 
213         dprint(DBG_CAT_MOD, "create_cat: %s,%u(%d)\n",
214                 str->name, cnid, inode->i_nlink);
215         hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
216 
217         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
218         entry_size = hfsplus_fill_cat_thread(sb, &entry,
219                 S_ISDIR(inode->i_mode) ?
220                         HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
221                 dir->i_ino, str);
222         err = hfs_brec_find(&fd);
223         if (err != -ENOENT) {
224                 if (!err)
225                         err = -EEXIST;
226                 goto err2;
227         }
228         err = hfs_brec_insert(&fd, &entry, entry_size);
229         if (err)
230                 goto err2;
231 
232         hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
233         entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
234         err = hfs_brec_find(&fd);
235         if (err != -ENOENT) {
236                 /* panic? */
237                 if (!err)
238                         err = -EEXIST;
239                 goto err1;
240         }
241         err = hfs_brec_insert(&fd, &entry, entry_size);
242         if (err)
243                 goto err1;
244 
245         dir->i_size++;
246         dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
247         hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
248 
249         hfs_find_exit(&fd);
250         return 0;
251 
252 err1:
253         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
254         if (!hfs_brec_find(&fd))
255                 hfs_brec_remove(&fd);
256 err2:
257         hfs_find_exit(&fd);
258         return err;
259 }
260 
261 int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
262 {
263         struct super_block *sb = dir->i_sb;
264         struct hfs_find_data fd;
265         struct hfsplus_fork_raw fork;
266         struct list_head *pos;
267         int err, off;
268         u16 type;
269 
270         dprint(DBG_CAT_MOD, "delete_cat: %s,%u\n",
271                 str ? str->name : NULL, cnid);
272         hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
273 
274         if (!str) {
275                 int len;
276 
277                 hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
278                 err = hfs_brec_find(&fd);
279                 if (err)
280                         goto out;
281 
282                 off = fd.entryoffset +
283                         offsetof(struct hfsplus_cat_thread, nodeName);
284                 fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
285                 hfs_bnode_read(fd.bnode,
286                         &fd.search_key->cat.name.length, off, 2);
287                 len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
288                 hfs_bnode_read(fd.bnode,
289                         &fd.search_key->cat.name.unicode,
290                         off + 2, len);
291                 fd.search_key->key_len = cpu_to_be16(6 + len);
292         } else
293                 hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
294 
295         err = hfs_brec_find(&fd);
296         if (err)
297                 goto out;
298 
299         type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
300         if (type == HFSPLUS_FILE) {
301 #if 0
302                 off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
303                 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
304                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
305 #endif
306 
307                 off = fd.entryoffset +
308                         offsetof(struct hfsplus_cat_file, rsrc_fork);
309                 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
310                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
311         }
312 
313         list_for_each(pos, &HFSPLUS_I(dir)->open_dir_list) {
314                 struct hfsplus_readdir_data *rd =
315                         list_entry(pos, struct hfsplus_readdir_data, list);
316                 if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
317                         rd->file->f_pos--;
318         }
319 
320         err = hfs_brec_remove(&fd);
321         if (err)
322                 goto out;
323 
324         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
325         err = hfs_brec_find(&fd);
326         if (err)
327                 goto out;
328 
329         err = hfs_brec_remove(&fd);
330         if (err)
331                 goto out;
332 
333         dir->i_size--;
334         dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
335         hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
336 out:
337         hfs_find_exit(&fd);
338 
339         return err;
340 }
341 
342 int hfsplus_rename_cat(u32 cnid,
343                        struct inode *src_dir, struct qstr *src_name,
344                        struct inode *dst_dir, struct qstr *dst_name)
345 {
346         struct super_block *sb = src_dir->i_sb;
347         struct hfs_find_data src_fd, dst_fd;
348         hfsplus_cat_entry entry;
349         int entry_size, type;
350         int err = 0;
351 
352         dprint(DBG_CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n",
353                 cnid, src_dir->i_ino, src_name->name,
354                 dst_dir->i_ino, dst_name->name);
355         hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd);
356         dst_fd = src_fd;
357 
358         /* find the old dir entry and read the data */
359         hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
360         err = hfs_brec_find(&src_fd);
361         if (err)
362                 goto out;
363         if (src_fd.entrylength > sizeof(entry) || src_fd.entrylength < 0) {
364                 err = -EIO;
365                 goto out;
366         }
367 
368         hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
369                                 src_fd.entrylength);
370 
371         /* create new dir entry with the data from the old entry */
372         hfsplus_cat_build_key(sb, dst_fd.search_key, dst_dir->i_ino, dst_name);
373         err = hfs_brec_find(&dst_fd);
374         if (err != -ENOENT) {
375                 if (!err)
376                         err = -EEXIST;
377                 goto out;
378         }
379 
380         err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
381         if (err)
382                 goto out;
383         dst_dir->i_size++;
384         dst_dir->i_mtime = dst_dir->i_ctime = CURRENT_TIME_SEC;
385 
386         /* finally remove the old entry */
387         hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
388         err = hfs_brec_find(&src_fd);
389         if (err)
390                 goto out;
391         err = hfs_brec_remove(&src_fd);
392         if (err)
393                 goto out;
394         src_dir->i_size--;
395         src_dir->i_mtime = src_dir->i_ctime = CURRENT_TIME_SEC;
396 
397         /* remove old thread entry */
398         hfsplus_cat_build_key(sb, src_fd.search_key, cnid, NULL);
399         err = hfs_brec_find(&src_fd);
400         if (err)
401                 goto out;
402         type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
403         err = hfs_brec_remove(&src_fd);
404         if (err)
405                 goto out;
406 
407         /* create new thread entry */
408         hfsplus_cat_build_key(sb, dst_fd.search_key, cnid, NULL);
409         entry_size = hfsplus_fill_cat_thread(sb, &entry, type,
410                 dst_dir->i_ino, dst_name);
411         err = hfs_brec_find(&dst_fd);
412         if (err != -ENOENT) {
413                 if (!err)
414                         err = -EEXIST;
415                 goto out;
416         }
417         err = hfs_brec_insert(&dst_fd, &entry, entry_size);
418 
419         hfsplus_mark_inode_dirty(dst_dir, HFSPLUS_I_CAT_DIRTY);
420         hfsplus_mark_inode_dirty(src_dir, HFSPLUS_I_CAT_DIRTY);
421 out:
422         hfs_bnode_put(dst_fd.bnode);
423         hfs_find_exit(&src_fd);
424         return err;
425 }
426 

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