ocfs2: Wrap access of directory allocations with ip_alloc_sem.
[linux-2.6] / fs / hfsplus / catalog.c
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 static void hfsplus_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         HFSPLUS_I(inode).rootflags = perms->rootflags;
81         HFSPLUS_I(inode).userflags = perms->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
87 static int hfsplus_cat_build_record(hfsplus_cat_entry *entry, u32 cnid, struct inode *inode)
88 {
89         if (S_ISDIR(inode->i_mode)) {
90                 struct hfsplus_cat_folder *folder;
91
92                 folder = &entry->folder;
93                 memset(folder, 0, sizeof(*folder));
94                 folder->type = cpu_to_be16(HFSPLUS_FOLDER);
95                 folder->id = cpu_to_be32(inode->i_ino);
96                 HFSPLUS_I(inode).create_date =
97                         folder->create_date =
98                         folder->content_mod_date =
99                         folder->attribute_mod_date =
100                         folder->access_date = hfsp_now2mt();
101                 hfsplus_set_perms(inode, &folder->permissions);
102                 if (inode == HFSPLUS_SB(inode->i_sb).hidden_dir)
103                         /* invisible and namelocked */
104                         folder->user_info.frFlags = cpu_to_be16(0x5000);
105                 return sizeof(*folder);
106         } else {
107                 struct hfsplus_cat_file *file;
108
109                 file = &entry->file;
110                 memset(file, 0, sizeof(*file));
111                 file->type = cpu_to_be16(HFSPLUS_FILE);
112                 file->flags = cpu_to_be16(HFSPLUS_FILE_THREAD_EXISTS);
113                 file->id = cpu_to_be32(cnid);
114                 HFSPLUS_I(inode).create_date =
115                         file->create_date =
116                         file->content_mod_date =
117                         file->attribute_mod_date =
118                         file->access_date = hfsp_now2mt();
119                 if (cnid == inode->i_ino) {
120                         hfsplus_set_perms(inode, &file->permissions);
121                         if (S_ISLNK(inode->i_mode)) {
122                                 file->user_info.fdType = cpu_to_be32(HFSP_SYMLINK_TYPE);
123                                 file->user_info.fdCreator = cpu_to_be32(HFSP_SYMLINK_CREATOR);
124                         } else {
125                                 file->user_info.fdType = cpu_to_be32(HFSPLUS_SB(inode->i_sb).type);
126                                 file->user_info.fdCreator = cpu_to_be32(HFSPLUS_SB(inode->i_sb).creator);
127                         }
128                         if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE)
129                                 file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED);
130                 } else {
131                         file->user_info.fdType = cpu_to_be32(HFSP_HARDLINK_TYPE);
132                         file->user_info.fdCreator = cpu_to_be32(HFSP_HFSPLUS_CREATOR);
133                         file->user_info.fdFlags = cpu_to_be16(0x100);
134                         file->create_date = HFSPLUS_I(HFSPLUS_SB(inode->i_sb).hidden_dir).create_date;
135                         file->permissions.dev = cpu_to_be32(HFSPLUS_I(inode).dev);
136                 }
137                 return sizeof(*file);
138         }
139 }
140
141 static int hfsplus_fill_cat_thread(struct super_block *sb,
142                                    hfsplus_cat_entry *entry, int type,
143                                    u32 parentid, struct qstr *str)
144 {
145         entry->type = cpu_to_be16(type);
146         entry->thread.reserved = 0;
147         entry->thread.parentID = cpu_to_be32(parentid);
148         hfsplus_asc2uni(sb, &entry->thread.nodeName, str->name, str->len);
149         return 10 + be16_to_cpu(entry->thread.nodeName.length) * 2;
150 }
151
152 /* Try to get a catalog entry for given catalog id */
153 int hfsplus_find_cat(struct super_block *sb, u32 cnid,
154                      struct hfs_find_data *fd)
155 {
156         hfsplus_cat_entry tmp;
157         int err;
158         u16 type;
159
160         hfsplus_cat_build_key(sb, fd->search_key, cnid, NULL);
161         err = hfs_brec_read(fd, &tmp, sizeof(hfsplus_cat_entry));
162         if (err)
163                 return err;
164
165         type = be16_to_cpu(tmp.type);
166         if (type != HFSPLUS_FOLDER_THREAD && type != HFSPLUS_FILE_THREAD) {
167                 printk(KERN_ERR "hfs: found bad thread record in catalog\n");
168                 return -EIO;
169         }
170
171         hfsplus_cat_build_key_uni(fd->search_key, be32_to_cpu(tmp.thread.parentID),
172                                  &tmp.thread.nodeName);
173         return hfs_brec_find(fd);
174 }
175
176 int hfsplus_create_cat(u32 cnid, struct inode *dir, struct qstr *str, struct inode *inode)
177 {
178         struct hfs_find_data fd;
179         struct super_block *sb;
180         hfsplus_cat_entry entry;
181         int entry_size;
182         int err;
183
184         dprint(DBG_CAT_MOD, "create_cat: %s,%u(%d)\n", str->name, cnid, inode->i_nlink);
185         sb = dir->i_sb;
186         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
187
188         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
189         entry_size = hfsplus_fill_cat_thread(sb, &entry, S_ISDIR(inode->i_mode) ?
190                         HFSPLUS_FOLDER_THREAD : HFSPLUS_FILE_THREAD,
191                         dir->i_ino, str);
192         err = hfs_brec_find(&fd);
193         if (err != -ENOENT) {
194                 if (!err)
195                         err = -EEXIST;
196                 goto err2;
197         }
198         err = hfs_brec_insert(&fd, &entry, entry_size);
199         if (err)
200                 goto err2;
201
202         hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
203         entry_size = hfsplus_cat_build_record(&entry, cnid, inode);
204         err = hfs_brec_find(&fd);
205         if (err != -ENOENT) {
206                 /* panic? */
207                 if (!err)
208                         err = -EEXIST;
209                 goto err1;
210         }
211         err = hfs_brec_insert(&fd, &entry, entry_size);
212         if (err)
213                 goto err1;
214
215         dir->i_size++;
216         dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
217         mark_inode_dirty(dir);
218         hfs_find_exit(&fd);
219         return 0;
220
221 err1:
222         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
223         if (!hfs_brec_find(&fd))
224                 hfs_brec_remove(&fd);
225 err2:
226         hfs_find_exit(&fd);
227         return err;
228 }
229
230 int hfsplus_delete_cat(u32 cnid, struct inode *dir, struct qstr *str)
231 {
232         struct super_block *sb;
233         struct hfs_find_data fd;
234         struct hfsplus_fork_raw fork;
235         struct list_head *pos;
236         int err, off;
237         u16 type;
238
239         dprint(DBG_CAT_MOD, "delete_cat: %s,%u\n", str ? str->name : NULL, cnid);
240         sb = dir->i_sb;
241         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd);
242
243         if (!str) {
244                 int len;
245
246                 hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
247                 err = hfs_brec_find(&fd);
248                 if (err)
249                         goto out;
250
251                 off = fd.entryoffset + offsetof(struct hfsplus_cat_thread, nodeName);
252                 fd.search_key->cat.parent = cpu_to_be32(dir->i_ino);
253                 hfs_bnode_read(fd.bnode, &fd.search_key->cat.name.length, off, 2);
254                 len = be16_to_cpu(fd.search_key->cat.name.length) * 2;
255                 hfs_bnode_read(fd.bnode, &fd.search_key->cat.name.unicode, off + 2, len);
256                 fd.search_key->key_len = cpu_to_be16(6 + len);
257         } else
258                 hfsplus_cat_build_key(sb, fd.search_key, dir->i_ino, str);
259
260         err = hfs_brec_find(&fd);
261         if (err)
262                 goto out;
263
264         type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
265         if (type == HFSPLUS_FILE) {
266 #if 0
267                 off = fd.entryoffset + offsetof(hfsplus_cat_file, data_fork);
268                 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
269                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_DATA);
270 #endif
271
272                 off = fd.entryoffset + offsetof(struct hfsplus_cat_file, rsrc_fork);
273                 hfs_bnode_read(fd.bnode, &fork, off, sizeof(fork));
274                 hfsplus_free_fork(sb, cnid, &fork, HFSPLUS_TYPE_RSRC);
275         }
276
277         list_for_each(pos, &HFSPLUS_I(dir).open_dir_list) {
278                 struct hfsplus_readdir_data *rd =
279                         list_entry(pos, struct hfsplus_readdir_data, list);
280                 if (fd.tree->keycmp(fd.search_key, (void *)&rd->key) < 0)
281                         rd->file->f_pos--;
282         }
283
284         err = hfs_brec_remove(&fd);
285         if (err)
286                 goto out;
287
288         hfsplus_cat_build_key(sb, fd.search_key, cnid, NULL);
289         err = hfs_brec_find(&fd);
290         if (err)
291                 goto out;
292
293         err = hfs_brec_remove(&fd);
294         if (err)
295                 goto out;
296
297         dir->i_size--;
298         dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
299         mark_inode_dirty(dir);
300 out:
301         hfs_find_exit(&fd);
302
303         return err;
304 }
305
306 int hfsplus_rename_cat(u32 cnid,
307                        struct inode *src_dir, struct qstr *src_name,
308                        struct inode *dst_dir, struct qstr *dst_name)
309 {
310         struct super_block *sb;
311         struct hfs_find_data src_fd, dst_fd;
312         hfsplus_cat_entry entry;
313         int entry_size, type;
314         int err = 0;
315
316         dprint(DBG_CAT_MOD, "rename_cat: %u - %lu,%s - %lu,%s\n", cnid, src_dir->i_ino, src_name->name,
317                 dst_dir->i_ino, dst_name->name);
318         sb = src_dir->i_sb;
319         hfs_find_init(HFSPLUS_SB(sb).cat_tree, &src_fd);
320         dst_fd = src_fd;
321
322         /* find the old dir entry and read the data */
323         hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
324         err = hfs_brec_find(&src_fd);
325         if (err)
326                 goto out;
327
328         hfs_bnode_read(src_fd.bnode, &entry, src_fd.entryoffset,
329                                 src_fd.entrylength);
330
331         /* create new dir entry with the data from the old entry */
332         hfsplus_cat_build_key(sb, dst_fd.search_key, dst_dir->i_ino, dst_name);
333         err = hfs_brec_find(&dst_fd);
334         if (err != -ENOENT) {
335                 if (!err)
336                         err = -EEXIST;
337                 goto out;
338         }
339
340         err = hfs_brec_insert(&dst_fd, &entry, src_fd.entrylength);
341         if (err)
342                 goto out;
343         dst_dir->i_size++;
344         dst_dir->i_mtime = dst_dir->i_ctime = CURRENT_TIME_SEC;
345         mark_inode_dirty(dst_dir);
346
347         /* finally remove the old entry */
348         hfsplus_cat_build_key(sb, src_fd.search_key, src_dir->i_ino, src_name);
349         err = hfs_brec_find(&src_fd);
350         if (err)
351                 goto out;
352         err = hfs_brec_remove(&src_fd);
353         if (err)
354                 goto out;
355         src_dir->i_size--;
356         src_dir->i_mtime = src_dir->i_ctime = CURRENT_TIME_SEC;
357         mark_inode_dirty(src_dir);
358
359         /* remove old thread entry */
360         hfsplus_cat_build_key(sb, src_fd.search_key, cnid, NULL);
361         err = hfs_brec_find(&src_fd);
362         if (err)
363                 goto out;
364         type = hfs_bnode_read_u16(src_fd.bnode, src_fd.entryoffset);
365         err = hfs_brec_remove(&src_fd);
366         if (err)
367                 goto out;
368
369         /* create new thread entry */
370         hfsplus_cat_build_key(sb, dst_fd.search_key, cnid, NULL);
371         entry_size = hfsplus_fill_cat_thread(sb, &entry, type, dst_dir->i_ino, dst_name);
372         err = hfs_brec_find(&dst_fd);
373         if (err != -ENOENT) {
374                 if (!err)
375                         err = -EEXIST;
376                 goto out;
377         }
378         err = hfs_brec_insert(&dst_fd, &entry, entry_size);
379 out:
380         hfs_bnode_put(dst_fd.bnode);
381         hfs_find_exit(&src_fd);
382         return err;
383 }