blob: 62fc14ea4b7387549d2f7017345070864a0d182d [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 */
20static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
Roman Zippel328b9222005-09-06 15:18:49 -070029 hfs_cat_build_key(dir->i_sb, fd.search_key, dir->i_ino, &dentry->d_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -070030 res = hfs_brec_read(&fd, &rec, sizeof(rec));
31 if (res) {
32 hfs_find_exit(&fd);
33 if (res == -ENOENT) {
34 /* No such entry */
35 inode = NULL;
36 goto done;
37 }
38 return ERR_PTR(res);
39 }
40 inode = hfs_iget(dir->i_sb, &fd.search_key->cat, &rec);
41 hfs_find_exit(&fd);
42 if (!inode)
43 return ERR_PTR(-EACCES);
44done:
45 d_add(dentry, inode);
46 return NULL;
47}
48
49/*
50 * hfs_readdir
51 */
52static int hfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
53{
Josef Sipekc5288962006-12-08 02:37:04 -080054 struct inode *inode = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 struct super_block *sb = inode->i_sb;
56 int len, err;
Roman Zippel328b9222005-09-06 15:18:49 -070057 char strbuf[HFS_MAX_NAMELEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 union hfs_cat_rec entry;
59 struct hfs_find_data fd;
60 struct hfs_readdir_data *rd;
61 u16 type;
62
63 if (filp->f_pos >= inode->i_size)
64 return 0;
65
66 hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
Roman Zippel328b9222005-09-06 15:18:49 -070067 hfs_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 err = hfs_brec_find(&fd);
69 if (err)
70 goto out;
71
72 switch ((u32)filp->f_pos) {
73 case 0:
74 /* This is completely artificial... */
75 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR))
76 goto out;
77 filp->f_pos++;
78 /* fall through */
79 case 1:
Amerigo Wangec81aec2009-12-14 17:57:37 -080080 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
81 err = -EIO;
82 goto out;
83 }
84
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
86 if (entry.type != HFS_CDR_THD) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -080087 printk(KERN_ERR "hfs: bad catalog folder thread\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 err = -EIO;
89 goto out;
90 }
91 //if (fd.entrylength < HFS_MIN_THREAD_SZ) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -080092 // printk(KERN_ERR "hfs: truncated catalog thread\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 // err = -EIO;
94 // goto out;
95 //}
96 if (filldir(dirent, "..", 2, 1,
97 be32_to_cpu(entry.thread.ParID), DT_DIR))
98 goto out;
99 filp->f_pos++;
100 /* fall through */
101 default:
102 if (filp->f_pos >= inode->i_size)
103 goto out;
104 err = hfs_brec_goto(&fd, filp->f_pos - 1);
105 if (err)
106 goto out;
107 }
108
109 for (;;) {
110 if (be32_to_cpu(fd.key->cat.ParID) != inode->i_ino) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800111 printk(KERN_ERR "hfs: walked past end of dir\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 err = -EIO;
113 goto out;
114 }
Amerigo Wangec81aec2009-12-14 17:57:37 -0800115
116 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
117 err = -EIO;
118 goto out;
119 }
120
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
122 type = entry.type;
Roman Zippel328b9222005-09-06 15:18:49 -0700123 len = hfs_mac2asc(sb, strbuf, &fd.key->cat.CName);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 if (type == HFS_CDR_DIR) {
125 if (fd.entrylength < sizeof(struct hfs_cat_dir)) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800126 printk(KERN_ERR "hfs: small dir entry\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 err = -EIO;
128 goto out;
129 }
130 if (filldir(dirent, strbuf, len, filp->f_pos,
131 be32_to_cpu(entry.dir.DirID), DT_DIR))
132 break;
133 } else if (type == HFS_CDR_FIL) {
134 if (fd.entrylength < sizeof(struct hfs_cat_file)) {
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800135 printk(KERN_ERR "hfs: small file entry\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 err = -EIO;
137 goto out;
138 }
139 if (filldir(dirent, strbuf, len, filp->f_pos,
140 be32_to_cpu(entry.file.FlNum), DT_REG))
141 break;
142 } else {
Roman Zippel7cf3cc32006-01-18 17:43:07 -0800143 printk(KERN_ERR "hfs: bad catalog entry type %d\n", type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 err = -EIO;
145 goto out;
146 }
147 filp->f_pos++;
148 if (filp->f_pos >= inode->i_size)
149 goto out;
150 err = hfs_brec_goto(&fd, 1);
151 if (err)
152 goto out;
153 }
154 rd = filp->private_data;
155 if (!rd) {
156 rd = kmalloc(sizeof(struct hfs_readdir_data), GFP_KERNEL);
157 if (!rd) {
158 err = -ENOMEM;
159 goto out;
160 }
161 filp->private_data = rd;
162 rd->file = filp;
163 list_add(&rd->list, &HFS_I(inode)->open_dir_list);
164 }
165 memcpy(&rd->key, &fd.key, sizeof(struct hfs_cat_key));
166out:
167 hfs_find_exit(&fd);
168 return err;
169}
170
171static int hfs_dir_release(struct inode *inode, struct file *file)
172{
173 struct hfs_readdir_data *rd = file->private_data;
174 if (rd) {
175 list_del(&rd->list);
176 kfree(rd);
177 }
178 return 0;
179}
180
181/*
182 * hfs_create()
183 *
184 * This is the create() entry in the inode_operations structure for
185 * regular HFS directories. The purpose is to create a new file in
186 * a directory and return a corresponding inode, given the inode for
187 * the directory and the name (and its length) of the new file.
188 */
Al Viro4acdaf22011-07-26 01:42:34 -0400189static int hfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 struct nameidata *nd)
191{
192 struct inode *inode;
193 int res;
194
195 inode = hfs_new_inode(dir, &dentry->d_name, mode);
196 if (!inode)
197 return -ENOSPC;
198
199 res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
200 if (res) {
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200201 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 hfs_delete_inode(inode);
203 iput(inode);
204 return res;
205 }
206 d_instantiate(dentry, inode);
207 mark_inode_dirty(inode);
208 return 0;
209}
210
211/*
212 * hfs_mkdir()
213 *
214 * This is the mkdir() entry in the inode_operations structure for
215 * regular HFS directories. The purpose is to create a new directory
216 * in a directory, given the inode for the parent directory and the
217 * name (and its length) of the new directory.
218 */
Al Viro18bb1db2011-07-26 01:41:39 -0400219static int hfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220{
221 struct inode *inode;
222 int res;
223
224 inode = hfs_new_inode(dir, &dentry->d_name, S_IFDIR | mode);
225 if (!inode)
226 return -ENOSPC;
227
228 res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
229 if (res) {
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200230 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 hfs_delete_inode(inode);
232 iput(inode);
233 return res;
234 }
235 d_instantiate(dentry, inode);
236 mark_inode_dirty(inode);
237 return 0;
238}
239
240/*
Al Viro69102e92011-03-02 23:46:51 -0500241 * hfs_remove()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 *
Al Viro69102e92011-03-02 23:46:51 -0500243 * This serves as both unlink() and rmdir() in the inode_operations
244 * structure for regular HFS directories. The purpose is to delete
245 * an existing child, given the inode for the parent directory and
246 * the name (and its length) of the existing directory.
247 *
248 * HFS does not have hardlinks, so both rmdir and unlink set the
249 * link count to 0. The only difference is the emptiness check.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 */
Al Viro69102e92011-03-02 23:46:51 -0500251static int hfs_remove(struct inode *dir, struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252{
Al Viro69102e92011-03-02 23:46:51 -0500253 struct inode *inode = dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 int res;
255
Al Viro69102e92011-03-02 23:46:51 -0500256 if (S_ISDIR(inode->i_mode) && inode->i_size != 2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 return -ENOTEMPTY;
258 res = hfs_cat_delete(inode->i_ino, dir, &dentry->d_name);
259 if (res)
260 return res;
Dave Hansence71ec32006-09-30 23:29:06 -0700261 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 inode->i_ctime = CURRENT_TIME_SEC;
263 hfs_delete_inode(inode);
264 mark_inode_dirty(inode);
265 return 0;
266}
267
268/*
269 * hfs_rename()
270 *
271 * This is the rename() entry in the inode_operations structure for
272 * regular HFS directories. The purpose is to rename an existing
273 * file or directory, given the inode for the current directory and
274 * the name (and its length) of the existing file/directory and the
275 * inode for the new directory and the name (and its length) of the
276 * new file/directory.
277 * XXX: how do you handle must_be dir?
278 */
279static int hfs_rename(struct inode *old_dir, struct dentry *old_dentry,
280 struct inode *new_dir, struct dentry *new_dentry)
281{
282 int res;
283
284 /* Unlink destination if it already exists */
285 if (new_dentry->d_inode) {
Al Viro69102e92011-03-02 23:46:51 -0500286 res = hfs_remove(new_dir, new_dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 if (res)
288 return res;
289 }
290
291 res = hfs_cat_move(old_dentry->d_inode->i_ino,
292 old_dir, &old_dentry->d_name,
293 new_dir, &new_dentry->d_name);
294 if (!res)
Roman Zippel328b9222005-09-06 15:18:49 -0700295 hfs_cat_build_key(old_dir->i_sb,
296 (btree_key *)&HFS_I(old_dentry->d_inode)->cat_key,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 new_dir->i_ino, &new_dentry->d_name);
298 return res;
299}
300
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800301const struct file_operations hfs_dir_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 .read = generic_read_dir,
303 .readdir = hfs_readdir,
304 .llseek = generic_file_llseek,
305 .release = hfs_dir_release,
306};
307
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800308const struct inode_operations hfs_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 .create = hfs_create,
310 .lookup = hfs_lookup,
Al Viro69102e92011-03-02 23:46:51 -0500311 .unlink = hfs_remove,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 .mkdir = hfs_mkdir,
Al Viro69102e92011-03-02 23:46:51 -0500313 .rmdir = hfs_remove,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 .rename = hfs_rename,
315 .setattr = hfs_inode_setattr,
316};