1 /*
2 * linux/fs/hfs/dir.c
3 *
4 * Copyright (C) 1995-1997 Paul H. Hargrove
5 * (C) 2003 Ardis Technologies <roman@ardistech.com>
6 * This file may be distributed under the terms of the GNU General Public License.
7 *
8 * This file contains directory-related functions independent of which
9 * scheme is being used to represent forks.
10 *
11 * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
12 */
13
14 #include "hfs_fs.h"
15 #include "btree.h"
16
17 /*
18 * hfs_lookup()
19 */
20 static struct dentry *hfs_lookup(struct inode *dir, struct dentry *dentry,
21 struct nameidata *nd)
22 {
23 hfs_cat_rec rec;
24 struct hfs_find_data fd;
25 struct inode *inode = NULL;
26 int res;
27
28 dentry->d_op = &hfs_dentry_operations;
29
30 hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
31 hfs_cat_build_key(dir->i_sb, fd.search_key, dir->i_ino, &dentry->d_name);
32 res = hfs_brec_read(&fd, &rec, sizeof(rec));
33 if (res) {
34 hfs_find_exit(&fd);
35 if (res == -ENOENT) {
36 /* No such entry */
37 inode = NULL;
38 goto done;
39 }
40 return ERR_PTR(res);
41 }
42 inode = hfs_iget(dir->i_sb, &fd.search_key->cat, &rec);
43 hfs_find_exit(&fd);
44 if (!inode)
45 return ERR_PTR(-EACCES);
46 done:
47 d_add(dentry, inode);
48 return NULL;
49 }
50
51 /*
52 * hfs_readdir
53 */
54 static int hfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
55 {
56 struct inode *inode = filp->f_path.dentry->d_inode;
57 struct super_block *sb = inode->i_sb;
58 int len, err;
59 char strbuf[HFS_MAX_NAMELEN];
60 union hfs_cat_rec entry;
61 struct hfs_find_data fd;
62 struct hfs_readdir_data *rd;
63 u16 type;
64
65 if (filp->f_pos >= inode->i_size)
66 return 0;
67
68 hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
69 hfs_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
70 err = hfs_brec_find(&fd);
71 if (err)
72 goto out;
73
74 switch ((u32)filp->f_pos) {
75 case 0:
76 /* This is completely artificial... */
77 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR))
78 goto out;
79 filp->f_pos++;
80 /* fall through */
81 case 1:
82 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
83 err = -EIO;
84 goto out;
85 }
86
87 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
88 if (entry.type != HFS_CDR_THD) {
89 printk(KERN_ERR "hfs: bad catalog folder thread\n");
90 err = -EIO;
91 goto out;
92 }
93 //if (fd.entrylength < HFS_MIN_THREAD_SZ) {
94 // printk(KERN_ERR "hfs: truncated catalog thread\n");
95 // err = -EIO;
96 // goto out;
97 //}
98 if (filldir(dirent, "..", 2, 1,
99 be32_to_cpu(entry.thread.ParID), DT_DIR))
100 goto out;
101 filp->f_pos++;
102 /* fall through */
103 default:
104 if (filp->f_pos >= inode->i_size)
105 goto out;
106 err = hfs_brec_goto(&fd, filp->f_pos - 1);
107 if (err)
108 goto out;
109 }
110
111 for (;;) {
112 if (be32_to_cpu(fd.key->cat.ParID) != inode->i_ino) {
113 printk(KERN_ERR "hfs: walked past end of dir\n");
114 err = -EIO;
115 goto out;
116 }
117
118 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
119 err = -EIO;
120 goto out;
121 }
122
123 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
124 type = entry.type;
125 len = hfs_mac2asc(sb, strbuf, &fd.key->cat.CName);
126 if (type == HFS_CDR_DIR) {
127 if (fd.entrylength < sizeof(struct hfs_cat_dir)) {
128 printk(KERN_ERR "hfs: small dir entry\n");
129 err = -EIO;
130 goto out;
131 }
132 if (filldir(dirent, strbuf, len, filp->f_pos,
133 be32_to_cpu(entry.dir.DirID), DT_DIR))
134 break;
135 } else if (type == HFS_CDR_FIL) {
136 if (fd.entrylength < sizeof(struct hfs_cat_file)) {
137 printk(KERN_ERR "hfs: small file entry\n");
138 err = -EIO;
139 goto out;
140 }
141 if (filldir(dirent, strbuf, len, filp->f_pos,
142 be32_to_cpu(entry.file.FlNum), DT_REG))
143 break;
144 } else {
145 printk(KERN_ERR "hfs: bad catalog entry type %d\n", type);
146 err = -EIO;
147 goto out;
148 }
149 filp->f_pos++;
150 if (filp->f_pos >= inode->i_size)
151 goto out;
152 err = hfs_brec_goto(&fd, 1);
153 if (err)
154 goto out;
155 }
156 rd = filp->private_data;
157 if (!rd) {
158 rd = kmalloc(sizeof(struct hfs_readdir_data), GFP_KERNEL);
159 if (!rd) {
160 err = -ENOMEM;
161 goto out;
162 }
163 filp->private_data = rd;
164 rd->file = filp;
165 list_add(&rd->list, &HFS_I(inode)->open_dir_list);
166 }
167 memcpy(&rd->key, &fd.key, sizeof(struct hfs_cat_key));
168 out:
169 hfs_find_exit(&fd);
170 return err;
171 }
172
173 static int hfs_dir_release(struct inode *inode, struct file *file)
174 {
175 struct hfs_readdir_data *rd = file->private_data;
176 if (rd) {
177 list_del(&rd->list);
178 kfree(rd);
179 }
180 return 0;
181 }
182
183 /*
184 * hfs_create()
185 *
186 * This is the create() entry in the inode_operations structure for
187 * regular HFS directories. The purpose is to create a new file in
188 * a directory and return a corresponding inode, given the inode for
189 * the directory and the name (and its length) of the new file.
190 */
191 static int hfs_create(struct inode *dir, struct dentry *dentry, int mode,
192 struct nameidata *nd)
193 {
194 struct inode *inode;
195 int res;
196
197 inode = hfs_new_inode(dir, &dentry->d_name, mode);
198 if (!inode)
199 return -ENOSPC;
200
201 res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
202 if (res) {
203 inode->i_nlink = 0;
204 hfs_delete_inode(inode);
205 iput(inode);
206 return res;
207 }
208 d_instantiate(dentry, inode);
209 mark_inode_dirty(inode);
210 return 0;
211 }
212
213 /*
214 * hfs_mkdir()
215 *
216 * This is the mkdir() entry in the inode_operations structure for
217 * regular HFS directories. The purpose is to create a new directory
218 * in a directory, given the inode for the parent directory and the
219 * name (and its length) of the new directory.
220 */
221 static int hfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
222 {
223 struct inode *inode;
224 int res;
225
226 inode = hfs_new_inode(dir, &dentry->d_name, S_IFDIR | mode);
227 if (!inode)
228 return -ENOSPC;
229
230 res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
231 if (res) {
232 inode->i_nlink = 0;
233 hfs_delete_inode(inode);
234 iput(inode);
235 return res;
236 }
237 d_instantiate(dentry, inode);
238 mark_inode_dirty(inode);
239 return 0;
240 }
241
242 /*
243 * hfs_unlink()
244 *
245 * This is the unlink() entry in the inode_operations structure for
246 * regular HFS directories. The purpose is to delete an existing
247 * file, given the inode for the parent directory and the name
248 * (and its length) of the existing file.
249 */
250 static int hfs_unlink(struct inode *dir, struct dentry *dentry)
251 {
252 struct inode *inode;
253 int res;
254
255 inode = dentry->d_inode;
256 res = hfs_cat_delete(inode->i_ino, dir, &dentry->d_name);
257 if (res)
258 return res;
259
260 drop_nlink(inode);
261 hfs_delete_inode(inode);
262 inode->i_ctime = CURRENT_TIME_SEC;
263 mark_inode_dirty(inode);
264
265 return res;
266 }
267
268 /*
269 * hfs_rmdir()
270 *
271 * This is the rmdir() entry in the inode_operations structure for
272 * regular HFS directories. The purpose is to delete an existing
273 * directory, given the inode for the parent directory and the name
274 * (and its length) of the existing directory.
275 */
276 static int hfs_rmdir(struct inode *dir, struct dentry *dentry)
277 {
278 struct inode *inode;
279 int res;
280
281 inode = dentry->d_inode;
282 if (inode->i_size != 2)
283 return -ENOTEMPTY;
284 res = hfs_cat_delete(inode->i_ino, dir, &dentry->d_name);
285 if (res)
286 return res;
287 clear_nlink(inode);
288 inode->i_ctime = CURRENT_TIME_SEC;
289 hfs_delete_inode(inode);
290 mark_inode_dirty(inode);
291 return 0;
292 }
293
294 /*
295 * hfs_rename()
296 *
297 * This is the rename() entry in the inode_operations structure for
298 * regular HFS directories. The purpose is to rename an existing
299 * file or directory, given the inode for the current directory and
300 * the name (and its length) of the existing file/directory and the
301 * inode for the new directory and the name (and its length) of the
302 * new file/directory.
303 * XXX: how do you handle must_be dir?
304 */
305 static int hfs_rename(struct inode *old_dir, struct dentry *old_dentry,
306 struct inode *new_dir, struct dentry *new_dentry)
307 {
308 int res;
309
310 /* Unlink destination if it already exists */
311 if (new_dentry->d_inode) {
312 res = hfs_unlink(new_dir, new_dentry);
313 if (res)
314 return res;
315 }
316
317 res = hfs_cat_move(old_dentry->d_inode->i_ino,
318 old_dir, &old_dentry->d_name,
319 new_dir, &new_dentry->d_name);
320 if (!res)
321 hfs_cat_build_key(old_dir->i_sb,
322 (btree_key *)&HFS_I(old_dentry->d_inode)->cat_key,
323 new_dir->i_ino, &new_dentry->d_name);
324 return res;
325 }
326
327 const struct file_operations hfs_dir_operations = {
328 .read = generic_read_dir,
329 .readdir = hfs_readdir,
330 .llseek = generic_file_llseek,
331 .release = hfs_dir_release,
332 };
333
334 const struct inode_operations hfs_dir_inode_operations = {
335 .create = hfs_create,
336 .lookup = hfs_lookup,
337 .unlink = hfs_unlink,
338 .mkdir = hfs_mkdir,
339 .rmdir = hfs_rmdir,
340 .rename = hfs_rename,
341 .setattr = hfs_inode_setattr,
342 };
343
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