blob: 70788e03820ae3e1c34689c95493798c20781928 [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,
Al Viro00cd8dd2012-06-10 17:13:09 -040021 unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070022{
23 hfs_cat_rec rec;
24 struct hfs_find_data fd;
25 struct inode *inode = NULL;
26 int res;
27
Alexey Khoroshilov9509f172013-04-30 15:27:52 -070028 res = hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
29 if (res)
30 return ERR_PTR(res);
Roman Zippel328b9222005-09-06 15:18:49 -070031 hfs_cat_build_key(dir->i_sb, fd.search_key, dir->i_ino, &dentry->d_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 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);
46done:
47 d_add(dentry, inode);
48 return NULL;
49}
50
51/*
52 * hfs_readdir
53 */
Al Viro002f8be2013-05-22 14:29:35 -040054static int hfs_readdir(struct file *file, struct dir_context *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -070055{
Al Viro002f8be2013-05-22 14:29:35 -040056 struct inode *inode = file_inode(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 struct super_block *sb = inode->i_sb;
58 int len, err;
Roman Zippel328b9222005-09-06 15:18:49 -070059 char strbuf[HFS_MAX_NAMELEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 union hfs_cat_rec entry;
61 struct hfs_find_data fd;
62 struct hfs_readdir_data *rd;
63 u16 type;
64
Al Viro002f8be2013-05-22 14:29:35 -040065 if (ctx->pos >= inode->i_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 return 0;
67
Alexey Khoroshilov9509f172013-04-30 15:27:52 -070068 err = hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
69 if (err)
70 return err;
Roman Zippel328b9222005-09-06 15:18:49 -070071 hfs_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 err = hfs_brec_find(&fd);
73 if (err)
74 goto out;
75
Al Viro002f8be2013-05-22 14:29:35 -040076 if (ctx->pos == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 /* This is completely artificial... */
Al Viro002f8be2013-05-22 14:29:35 -040078 if (!dir_emit_dot(file, ctx))
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 goto out;
Al Viro002f8be2013-05-22 14:29:35 -040080 ctx->pos = 1;
81 }
82 if (ctx->pos == 1) {
Amerigo Wangec81aec2009-12-14 17:57:37 -080083 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
84 err = -EIO;
85 goto out;
86 }
87
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
89 if (entry.type != HFS_CDR_THD) {
Joe Perchesd6142672013-04-30 15:27:55 -070090 pr_err("bad catalog folder thread\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 err = -EIO;
92 goto out;
93 }
94 //if (fd.entrylength < HFS_MIN_THREAD_SZ) {
Joe Perchesd6142672013-04-30 15:27:55 -070095 // pr_err("truncated catalog thread\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 // err = -EIO;
97 // goto out;
98 //}
Al Viro002f8be2013-05-22 14:29:35 -040099 if (!dir_emit(ctx, "..", 2,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 be32_to_cpu(entry.thread.ParID), DT_DIR))
101 goto out;
Al Viro002f8be2013-05-22 14:29:35 -0400102 ctx->pos = 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 }
Al Viro002f8be2013-05-22 14:29:35 -0400104 if (ctx->pos >= inode->i_size)
105 goto out;
106 err = hfs_brec_goto(&fd, ctx->pos - 1);
107 if (err)
108 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
110 for (;;) {
111 if (be32_to_cpu(fd.key->cat.ParID) != inode->i_ino) {
Joe Perchesd6142672013-04-30 15:27:55 -0700112 pr_err("walked past end of dir\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 err = -EIO;
114 goto out;
115 }
Amerigo Wangec81aec2009-12-14 17:57:37 -0800116
117 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
118 err = -EIO;
119 goto out;
120 }
121
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
123 type = entry.type;
Roman Zippel328b9222005-09-06 15:18:49 -0700124 len = hfs_mac2asc(sb, strbuf, &fd.key->cat.CName);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 if (type == HFS_CDR_DIR) {
126 if (fd.entrylength < sizeof(struct hfs_cat_dir)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700127 pr_err("small dir entry\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 err = -EIO;
129 goto out;
130 }
Al Viro002f8be2013-05-22 14:29:35 -0400131 if (!dir_emit(ctx, strbuf, len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 be32_to_cpu(entry.dir.DirID), DT_DIR))
133 break;
134 } else if (type == HFS_CDR_FIL) {
135 if (fd.entrylength < sizeof(struct hfs_cat_file)) {
Joe Perchesd6142672013-04-30 15:27:55 -0700136 pr_err("small file entry\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 err = -EIO;
138 goto out;
139 }
Al Viro002f8be2013-05-22 14:29:35 -0400140 if (!dir_emit(ctx, strbuf, len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 be32_to_cpu(entry.file.FlNum), DT_REG))
142 break;
143 } else {
Joe Perchesd6142672013-04-30 15:27:55 -0700144 pr_err("bad catalog entry type %d\n", type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 err = -EIO;
146 goto out;
147 }
Al Viro002f8be2013-05-22 14:29:35 -0400148 ctx->pos++;
149 if (ctx->pos >= inode->i_size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 goto out;
151 err = hfs_brec_goto(&fd, 1);
152 if (err)
153 goto out;
154 }
Al Viro002f8be2013-05-22 14:29:35 -0400155 rd = file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 if (!rd) {
157 rd = kmalloc(sizeof(struct hfs_readdir_data), GFP_KERNEL);
158 if (!rd) {
159 err = -ENOMEM;
160 goto out;
161 }
Al Viro002f8be2013-05-22 14:29:35 -0400162 file->private_data = rd;
163 rd->file = file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 list_add(&rd->list, &HFS_I(inode)->open_dir_list);
165 }
166 memcpy(&rd->key, &fd.key, sizeof(struct hfs_cat_key));
167out:
168 hfs_find_exit(&fd);
169 return err;
170}
171
172static int hfs_dir_release(struct inode *inode, struct file *file)
173{
174 struct hfs_readdir_data *rd = file->private_data;
175 if (rd) {
Al Viro19502672013-05-05 20:20:25 -0400176 mutex_lock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 list_del(&rd->list);
Al Viro19502672013-05-05 20:20:25 -0400178 mutex_unlock(&inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 kfree(rd);
180 }
181 return 0;
182}
183
184/*
185 * hfs_create()
186 *
187 * This is the create() entry in the inode_operations structure for
188 * regular HFS directories. The purpose is to create a new file in
189 * a directory and return a corresponding inode, given the inode for
190 * the directory and the name (and its length) of the new file.
191 */
Al Viro4acdaf22011-07-26 01:42:34 -0400192static int hfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
Al Viroebfc3b42012-06-10 18:05:36 -0400193 bool excl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194{
195 struct inode *inode;
196 int res;
197
198 inode = hfs_new_inode(dir, &dentry->d_name, mode);
199 if (!inode)
Chengyu Song13f24482015-04-16 12:46:53 -0700200 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
202 res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
203 if (res) {
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200204 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 hfs_delete_inode(inode);
206 iput(inode);
207 return res;
208 }
209 d_instantiate(dentry, inode);
210 mark_inode_dirty(inode);
211 return 0;
212}
213
214/*
215 * hfs_mkdir()
216 *
217 * This is the mkdir() entry in the inode_operations structure for
218 * regular HFS directories. The purpose is to create a new directory
219 * in a directory, given the inode for the parent directory and the
220 * name (and its length) of the new directory.
221 */
Al Viro18bb1db2011-07-26 01:41:39 -0400222static int hfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223{
224 struct inode *inode;
225 int res;
226
227 inode = hfs_new_inode(dir, &dentry->d_name, S_IFDIR | mode);
228 if (!inode)
Chengyu Song13f24482015-04-16 12:46:53 -0700229 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
231 res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
232 if (res) {
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200233 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 hfs_delete_inode(inode);
235 iput(inode);
236 return res;
237 }
238 d_instantiate(dentry, inode);
239 mark_inode_dirty(inode);
240 return 0;
241}
242
243/*
Al Viro69102e92011-03-02 23:46:51 -0500244 * hfs_remove()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 *
Al Viro69102e92011-03-02 23:46:51 -0500246 * This serves as both unlink() and rmdir() in the inode_operations
247 * structure for regular HFS directories. The purpose is to delete
248 * an existing child, given the inode for the parent directory and
249 * the name (and its length) of the existing directory.
250 *
251 * HFS does not have hardlinks, so both rmdir and unlink set the
252 * link count to 0. The only difference is the emptiness check.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 */
Al Viro69102e92011-03-02 23:46:51 -0500254static int hfs_remove(struct inode *dir, struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255{
David Howells2b0143b2015-03-17 22:25:59 +0000256 struct inode *inode = d_inode(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 int res;
258
Al Viro69102e92011-03-02 23:46:51 -0500259 if (S_ISDIR(inode->i_mode) && inode->i_size != 2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 return -ENOTEMPTY;
261 res = hfs_cat_delete(inode->i_ino, dir, &dentry->d_name);
262 if (res)
263 return res;
Dave Hansence71ec32006-09-30 23:29:06 -0700264 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 inode->i_ctime = CURRENT_TIME_SEC;
266 hfs_delete_inode(inode);
267 mark_inode_dirty(inode);
268 return 0;
269}
270
271/*
272 * hfs_rename()
273 *
274 * This is the rename() entry in the inode_operations structure for
275 * regular HFS directories. The purpose is to rename an existing
276 * file or directory, given the inode for the current directory and
277 * the name (and its length) of the existing file/directory and the
278 * inode for the new directory and the name (and its length) of the
279 * new file/directory.
280 * XXX: how do you handle must_be dir?
281 */
282static int hfs_rename(struct inode *old_dir, struct dentry *old_dentry,
283 struct inode *new_dir, struct dentry *new_dentry)
284{
285 int res;
286
287 /* Unlink destination if it already exists */
David Howells2b0143b2015-03-17 22:25:59 +0000288 if (d_really_is_positive(new_dentry)) {
Al Viro69102e92011-03-02 23:46:51 -0500289 res = hfs_remove(new_dir, new_dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 if (res)
291 return res;
292 }
293
David Howells2b0143b2015-03-17 22:25:59 +0000294 res = hfs_cat_move(d_inode(old_dentry)->i_ino,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 old_dir, &old_dentry->d_name,
296 new_dir, &new_dentry->d_name);
297 if (!res)
Roman Zippel328b9222005-09-06 15:18:49 -0700298 hfs_cat_build_key(old_dir->i_sb,
David Howells2b0143b2015-03-17 22:25:59 +0000299 (btree_key *)&HFS_I(d_inode(old_dentry))->cat_key,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 new_dir->i_ino, &new_dentry->d_name);
301 return res;
302}
303
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800304const struct file_operations hfs_dir_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 .read = generic_read_dir,
Al Viro002f8be2013-05-22 14:29:35 -0400306 .iterate = hfs_readdir,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 .llseek = generic_file_llseek,
308 .release = hfs_dir_release,
309};
310
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800311const struct inode_operations hfs_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 .create = hfs_create,
313 .lookup = hfs_lookup,
Al Viro69102e92011-03-02 23:46:51 -0500314 .unlink = hfs_remove,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 .mkdir = hfs_mkdir,
Al Viro69102e92011-03-02 23:46:51 -0500316 .rmdir = hfs_remove,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 .rename = hfs_rename,
318 .setattr = hfs_inode_setattr,
319};