blob: 163190ecc0d2e77fcaa582da91cb8627dcb6145d [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;
Al Viro9717a912016-05-12 20:13:50 -0400164 spin_lock(&HFS_I(inode)->open_dir_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 list_add(&rd->list, &HFS_I(inode)->open_dir_list);
Al Viro9717a912016-05-12 20:13:50 -0400166 spin_unlock(&HFS_I(inode)->open_dir_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 }
Al Viro9717a912016-05-12 20:13:50 -0400168 /*
169 * Can be done after the list insertion; exclusion with
170 * hfs_delete_cat() is provided by directory lock.
171 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 memcpy(&rd->key, &fd.key, sizeof(struct hfs_cat_key));
173out:
174 hfs_find_exit(&fd);
175 return err;
176}
177
178static int hfs_dir_release(struct inode *inode, struct file *file)
179{
180 struct hfs_readdir_data *rd = file->private_data;
181 if (rd) {
Al Viro9717a912016-05-12 20:13:50 -0400182 spin_lock(&HFS_I(inode)->open_dir_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 list_del(&rd->list);
Al Viro9717a912016-05-12 20:13:50 -0400184 spin_unlock(&HFS_I(inode)->open_dir_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 kfree(rd);
186 }
187 return 0;
188}
189
190/*
191 * hfs_create()
192 *
193 * This is the create() entry in the inode_operations structure for
194 * regular HFS directories. The purpose is to create a new file in
195 * a directory and return a corresponding inode, given the inode for
196 * the directory and the name (and its length) of the new file.
197 */
Al Viro4acdaf22011-07-26 01:42:34 -0400198static int hfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
Al Viroebfc3b42012-06-10 18:05:36 -0400199 bool excl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200{
201 struct inode *inode;
202 int res;
203
204 inode = hfs_new_inode(dir, &dentry->d_name, mode);
205 if (!inode)
Chengyu Song13f24482015-04-16 12:46:53 -0700206 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
208 res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
209 if (res) {
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200210 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 hfs_delete_inode(inode);
212 iput(inode);
213 return res;
214 }
215 d_instantiate(dentry, inode);
216 mark_inode_dirty(inode);
217 return 0;
218}
219
220/*
221 * hfs_mkdir()
222 *
223 * This is the mkdir() entry in the inode_operations structure for
224 * regular HFS directories. The purpose is to create a new directory
225 * in a directory, given the inode for the parent directory and the
226 * name (and its length) of the new directory.
227 */
Al Viro18bb1db2011-07-26 01:41:39 -0400228static int hfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229{
230 struct inode *inode;
231 int res;
232
233 inode = hfs_new_inode(dir, &dentry->d_name, S_IFDIR | mode);
234 if (!inode)
Chengyu Song13f24482015-04-16 12:46:53 -0700235 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
237 res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
238 if (res) {
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200239 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 hfs_delete_inode(inode);
241 iput(inode);
242 return res;
243 }
244 d_instantiate(dentry, inode);
245 mark_inode_dirty(inode);
246 return 0;
247}
248
249/*
Al Viro69102e92011-03-02 23:46:51 -0500250 * hfs_remove()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 *
Al Viro69102e92011-03-02 23:46:51 -0500252 * This serves as both unlink() and rmdir() in the inode_operations
253 * structure for regular HFS directories. The purpose is to delete
254 * an existing child, given the inode for the parent directory and
255 * the name (and its length) of the existing directory.
256 *
257 * HFS does not have hardlinks, so both rmdir and unlink set the
258 * link count to 0. The only difference is the emptiness check.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 */
Al Viro69102e92011-03-02 23:46:51 -0500260static int hfs_remove(struct inode *dir, struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261{
David Howells2b0143b2015-03-17 22:25:59 +0000262 struct inode *inode = d_inode(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 int res;
264
Al Viro69102e92011-03-02 23:46:51 -0500265 if (S_ISDIR(inode->i_mode) && inode->i_size != 2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 return -ENOTEMPTY;
267 res = hfs_cat_delete(inode->i_ino, dir, &dentry->d_name);
268 if (res)
269 return res;
Dave Hansence71ec32006-09-30 23:29:06 -0700270 clear_nlink(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 inode->i_ctime = CURRENT_TIME_SEC;
272 hfs_delete_inode(inode);
273 mark_inode_dirty(inode);
274 return 0;
275}
276
277/*
278 * hfs_rename()
279 *
280 * This is the rename() entry in the inode_operations structure for
281 * regular HFS directories. The purpose is to rename an existing
282 * file or directory, given the inode for the current directory and
283 * the name (and its length) of the existing file/directory and the
284 * inode for the new directory and the name (and its length) of the
285 * new file/directory.
286 * XXX: how do you handle must_be dir?
287 */
288static int hfs_rename(struct inode *old_dir, struct dentry *old_dentry,
289 struct inode *new_dir, struct dentry *new_dentry)
290{
291 int res;
292
293 /* Unlink destination if it already exists */
David Howells2b0143b2015-03-17 22:25:59 +0000294 if (d_really_is_positive(new_dentry)) {
Al Viro69102e92011-03-02 23:46:51 -0500295 res = hfs_remove(new_dir, new_dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 if (res)
297 return res;
298 }
299
David Howells2b0143b2015-03-17 22:25:59 +0000300 res = hfs_cat_move(d_inode(old_dentry)->i_ino,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 old_dir, &old_dentry->d_name,
302 new_dir, &new_dentry->d_name);
303 if (!res)
Roman Zippel328b9222005-09-06 15:18:49 -0700304 hfs_cat_build_key(old_dir->i_sb,
David Howells2b0143b2015-03-17 22:25:59 +0000305 (btree_key *)&HFS_I(d_inode(old_dentry))->cat_key,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 new_dir->i_ino, &new_dentry->d_name);
307 return res;
308}
309
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800310const struct file_operations hfs_dir_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 .read = generic_read_dir,
Al Viro9717a912016-05-12 20:13:50 -0400312 .iterate_shared = hfs_readdir,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 .llseek = generic_file_llseek,
314 .release = hfs_dir_release,
315};
316
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800317const struct inode_operations hfs_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 .create = hfs_create,
319 .lookup = hfs_lookup,
Al Viro69102e92011-03-02 23:46:51 -0500320 .unlink = hfs_remove,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 .mkdir = hfs_mkdir,
Al Viro69102e92011-03-02 23:46:51 -0500322 .rmdir = hfs_remove,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 .rename = hfs_rename,
324 .setattr = hfs_inode_setattr,
325};