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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                 folder->id = cpu_to_be32(inode->i_ino);
107                 HFSPLUS_I(inode)->create_date =
108                         folder->create_date =
109                         folder->content_mod_date =
110                         folder->attribute_mod_date =
111                         folder->access_date = hfsp_now2mt();
112                 hfsplus_cat_set_perms(inode, &folder->permissions);
113                 if (inode == sbi->hidden_dir)
114                         /* invisible and namelocked */
115                         folder->user_info.frFlags = cpu_to_be16(0x5000);
116                 return sizeof(*folder);
117         } else {
118                 struct hfsplus_cat_file *file;
119 
120                 file = &entry->file;
121                 memset(file, 0, sizeof(*file));
122                 file->type = cpu_to_be16(HFSPLUS_FILE);
123                 file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
124                 file->id = cpu_to_be32(cnid);
125                 HFSPLUS_I(inode)->create_date =
126                         file->create_date =
127                         file->content_mod_date =
128                         file->attribute_mod_date =
129                         file->access_date = hfsp_now2mt();
130                 if (cnid == inode->i_ino) {
131                         hfsplus_cat_set_perms(inode, &file->permissions);
132                         if (S_ISLNK(inode->i_mode)) {
133                                 file->user_info.fdType =
134                                         cpu_to_be32(HFSP_SYMLINK_TYPE);
135                                 file->user_info.fdCreator =
136                                         cpu_to_be32(HFSP_SYMLINK_CREATOR);
137                         } else {
138                                 file->user_info.fdType =
139                                         cpu_to_be32(sbi->type);
140                                 file->user_info.fdCreator =
141                                         cpu_to_be32(sbi->creator);
142                         }
143                         if (HFSPLUS_FLG_IMMUTABLE &
144                                         (file->permissions.rootflags |
145                                         file->permissions.userflags))
146                                 file->flags |=
147                                         cpu_to_be16(HFSPLUS_FILE_LOCKED);
148                 } else {
149                         file->user_info.fdType =
150                                 cpu_to_be32(HFSP_HARDLINK_TYPE);
151                         file->user_info.fdCreator =
152                                 cpu_to_be32(HFSP_HFSPLUS_CREATOR);
153                         file->user_info.fdFlags =
154                                 cpu_to_be16(0x100);
155                         file->create_date =
156                                 HFSPLUS_I(sbi->hidden_dir)->create_date;
157                         file->permissions.dev =
158                                 cpu_to_be32(HFSPLUS_I(inode)->linkid);
159                 }
160                 return sizeof(*file);
161         }
162 }
163 
164 static int hfsplus_fill_cat_thread(struct super_block *sb,
165                                    hfsplus_cat_entry *entry, int type,
166                                    u32 parentid, struct qstr *str)
167 {
168         entry->type = cpu_to_be16(type);
169         entry->thread.reserved = 0;
170         entry->thread.parentID = cpu_to_be32(parentid);
171         hfsplus_asc2uni(sb, &entry->thread.nodeName, HFSPLUS_MAX_STRLEN,
172                                 str->name, str->len);
173         return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
174 }
175 
176 /* Try to get a catalog entry for given catalog id */
177 int hfsplus_find_cat(struct super_block *sb, u32 cnid,
178                      struct hfs_find_data *fd)
179 {
180         hfsplus_cat_entry tmp;
181         int err;
182         u16 type;
183 
184         hfsplus_cat_build_key(sb, fd->search_key, cnid, NULL);
185         err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
186         if (err)
187                 return err;
188 
189         type = be16_to_cpu(tmp.type);
190         if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
191                 pr_err("found bad thread record in catalog\n");
192                 return -EIO;
193         }
194 
195         if (be16_to_cpu(tmp.thread.nodeName.length) > 255) {
196                 pr_err("catalog name length corrupted\n");
197                 return -EIO;
198         }
199 
200         hfsplus_cat_build_key_uni(fd->search_key,
201                 be32_to_cpu(tmp.thread.parentID),
202                 &tmp.thread.nodeName);
203         return hfs_brec_find(fd, hfs_find_rec_by_key);
204 }
205 
206 int hfsplus_create_cat(u32 cnid, struct inode *dir,
207                 struct qstr *str, struct inode *inode)
208 {
209         struct super_block *sb = dir->i_sb;
210         struct hfs_find_data fd;
211         hfsplus_cat_entry entry;
212         int entry_size;
213         int err;
214 
215         hfs_dbg(CAT_MOD, "create_cat: %s,%u(%d)\n",
216                 str->name, cnid, inode->i_nlink);
217         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
218         if (err)
219                 return err;
220 
221         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
222         entry_size = hfsplus_fill_cat_thread(sb, &entry,
223                 S_ISDIR(inode->i_mode) ?
224                         HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
225                 dir->i_ino, str);
226         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
227         if (err != -ENOENT) {
228                 if (!err)
229                         err = -EEXIST;
230                 goto err2;
231         }
232         err = hfs_brec_insert(&fd, &entry, entry_size);
233         if (err)
234                 goto err2;
235 
236         hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
237         entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
238         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
239         if (err != -ENOENT) {
240                 /* panic? */
241                 if (!err)
242                         err = -EEXIST;
243                 goto err1;
244         }
245         err = hfs_brec_insert(&fd, &entry, entry_size);
246         if (err)
247                 goto err1;
248 
249         dir->i_size++;
250         dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
251         hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
252 
253         hfs_find_exit(&fd);
254         return 0;
255 
256 err1:
257         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
258         if (!hfs_brec_find(&fd, hfs_find_rec_by_key))
259                 hfs_brec_remove(&fd);
260 err2:
261         hfs_find_exit(&fd);
262         return err;
263 }
264 
265 int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
266 {
267         struct super_block *sb = dir->i_sb;
268         struct hfs_find_data fd;
269         struct hfsplus_fork_raw fork;
270         struct list_head *pos;
271         int err, off;
272         u16 type;
273 
274         hfs_dbg(CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
275         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd);
276         if (err)
277                 return err;
278 
279         if (!str) {
280                 int len;
281 
282                 hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
283                 err = hfs_brec_find(&fd, hfs_find_rec_by_key);
284                 if (err)
285                         goto out;
286 
287                 off = fd.entryoffset +
288                         offsetof(struct hfsplus_cat_thread, nodeName);
289                 fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
290                 hfs_bnode_read(fd.bnode,
291                         &fd.search_key->cat.name.length, off, 2);
292                 len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
293                 hfs_bnode_read(fd.bnode,
294                         &fd.search_key->cat.name.unicode,
295                         off + 2, len);
296                 fd.search_key->key_len = cpu_to_be16(6 + len);
297         } else
298                 hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
299 
300         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
301         if (err)
302                 goto out;
303 
304         type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
305         if (type == HFSPLUS_FILE) {
306 #if 0
307                 off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
308                 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
309                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
310 #endif
311 
312                 off = fd.entryoffset +
313                         offsetof(struct hfsplus_cat_file, rsrc_fork);
314                 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
315                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
316         }
317 
318         list_for_each(pos, &HFSPLUS_I(dir)->open_dir_list) {
319                 struct hfsplus_readdir_data *rd =
320                         list_entry(pos, struct hfsplus_readdir_data, list);
321                 if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
322                         rd->file->f_pos--;
323         }
324 
325         err = hfs_brec_remove(&fd);
326         if (err)
327                 goto out;
328 
329         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
330         err = hfs_brec_find(&fd, hfs_find_rec_by_key);
331         if (err)
332                 goto out;
333 
334         err = hfs_brec_remove(&fd);
335         if (err)
336                 goto out;
337 
338         dir->i_size--;
339         dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
340         hfsplus_mark_inode_dirty(dir, HFSPLUS_I_CAT_DIRTY);
341 
342         if (type == HFSPLUS_FILE || type == HFSPLUS_FOLDER) {
343                 if (HFSPLUS_SB(sb)->attr_tree)
344                         hfsplus_delete_all_attrs(dir, cnid);
345         }
346 
347 out:
348         hfs_find_exit(&fd);
349 
350         return err;
351 }
352 
353 int hfsplus_rename_cat(u32 cnid,
354                        struct inode *src_dir, struct qstr *src_name,
355                        struct inode *dst_dir, struct qstr *dst_name)
356 {
357         struct super_block *sb = src_dir->i_sb;
358         struct hfs_find_data src_fd, dst_fd;
359         hfsplus_cat_entry entry;
360         int entry_size, type;
361         int err;
362 
363         hfs_dbg(CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n",
364                 cnid, src_dir->i_ino, src_name->name,
365                 dst_dir->i_ino, dst_name->name);
366         err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &src_fd);
367         if (err)
368                 return err;
369         dst_fd = src_fd;
370 
371         /* find the old dir entry and read the data */
372         hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
373         err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
374         if (err)
375                 goto out;
376         if (src_fd.entrylength > sizeof(entry) || src_fd.entrylength < 0) {
377                 err = -EIO;
378                 goto out;
379         }
380 
381         hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
382                                 src_fd.entrylength);
383 
384         /* create new dir entry with the data from the old entry */
385         hfsplus_cat_build_key(sb, dst_fd.search_key, dst_dir->i_ino, dst_name);
386         err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
387         if (err != -ENOENT) {
388                 if (!err)
389                         err = -EEXIST;
390                 goto out;
391         }
392 
393         err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
394         if (err)
395                 goto out;
396         dst_dir->i_size++;
397         dst_dir->i_mtime = dst_dir->i_ctime = CURRENT_TIME_SEC;
398 
399         /* finally remove the old entry */
400         hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
401         err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
402         if (err)
403                 goto out;
404         err = hfs_brec_remove(&src_fd);
405         if (err)
406                 goto out;
407         src_dir->i_size--;
408         src_dir->i_mtime = src_dir->i_ctime = CURRENT_TIME_SEC;
409 
410         /* remove old thread entry */
411         hfsplus_cat_build_key(sb, src_fd.search_key, cnid, NULL);
412         err = hfs_brec_find(&src_fd, hfs_find_rec_by_key);
413         if (err)
414                 goto out;
415         type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
416         err = hfs_brec_remove(&src_fd);
417         if (err)
418                 goto out;
419 
420         /* create new thread entry */
421         hfsplus_cat_build_key(sb, dst_fd.search_key, cnid, NULL);
422         entry_size = hfsplus_fill_cat_thread(sb, &entry, type,
423                 dst_dir->i_ino, dst_name);
424         err = hfs_brec_find(&dst_fd, hfs_find_rec_by_key);
425         if (err != -ENOENT) {
426                 if (!err)
427                         err = -EEXIST;
428                 goto out;
429         }
430         err = hfs_brec_insert(&dst_fd, &entry, entry_size);
431 
432         hfsplus_mark_inode_dirty(dst_dir, HFSPLUS_I_CAT_DIRTY);
433         hfsplus_mark_inode_dirty(src_dir, HFSPLUS_I_CAT_DIRTY);
434 out:
435         hfs_bnode_put(dst_fd.bnode);
436         hfs_find_exit(&src_fd);
437         return err;
438 }
439 

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