drm/radeon/kms/atom: fix possible segfault in pm setup
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / hfs / dir.c
blobb4d70b13be92548c6ac2cd72ae5e34f3ab53ec21
1 /*
2 * linux/fs/hfs/dir.c
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.
8 * This file contains directory-related functions independent of which
9 * scheme is being used to represent forks.
11 * Based on the minix file system code, (C) 1991, 1992 by Linus Torvalds
14 #include "hfs_fs.h"
15 #include "btree.h"
18 * hfs_lookup()
20 static struct dentry *hfs_lookup(struct inode *dir, struct dentry *dentry,
21 struct nameidata *nd)
23 hfs_cat_rec rec;
24 struct hfs_find_data fd;
25 struct inode *inode = NULL;
26 int res;
28 hfs_find_init(HFS_SB(dir->i_sb)->cat_tree, &fd);
29 hfs_cat_build_key(dir->i_sb, fd.search_key, dir->i_ino, &dentry->d_name);
30 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;
38 return ERR_PTR(res);
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);
44 done:
45 d_add(dentry, inode);
46 return NULL;
50 * hfs_readdir
52 static int hfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
54 struct inode *inode = filp->f_path.dentry->d_inode;
55 struct super_block *sb = inode->i_sb;
56 int len, err;
57 char strbuf[HFS_MAX_NAMELEN];
58 union hfs_cat_rec entry;
59 struct hfs_find_data fd;
60 struct hfs_readdir_data *rd;
61 u16 type;
63 if (filp->f_pos >= inode->i_size)
64 return 0;
66 hfs_find_init(HFS_SB(sb)->cat_tree, &fd);
67 hfs_cat_build_key(sb, fd.search_key, inode->i_ino, NULL);
68 err = hfs_brec_find(&fd);
69 if (err)
70 goto out;
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:
80 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
81 err = -EIO;
82 goto out;
85 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
86 if (entry.type != HFS_CDR_THD) {
87 printk(KERN_ERR "hfs: bad catalog folder thread\n");
88 err = -EIO;
89 goto out;
91 //if (fd.entrylength < HFS_MIN_THREAD_SZ) {
92 // printk(KERN_ERR "hfs: truncated catalog thread\n");
93 // 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;
109 for (;;) {
110 if (be32_to_cpu(fd.key->cat.ParID) != inode->i_ino) {
111 printk(KERN_ERR "hfs: walked past end of dir\n");
112 err = -EIO;
113 goto out;
116 if (fd.entrylength > sizeof(entry) || fd.entrylength < 0) {
117 err = -EIO;
118 goto out;
121 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, fd.entrylength);
122 type = entry.type;
123 len = hfs_mac2asc(sb, strbuf, &fd.key->cat.CName);
124 if (type == HFS_CDR_DIR) {
125 if (fd.entrylength < sizeof(struct hfs_cat_dir)) {
126 printk(KERN_ERR "hfs: small dir entry\n");
127 err = -EIO;
128 goto out;
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)) {
135 printk(KERN_ERR "hfs: small file entry\n");
136 err = -EIO;
137 goto out;
139 if (filldir(dirent, strbuf, len, filp->f_pos,
140 be32_to_cpu(entry.file.FlNum), DT_REG))
141 break;
142 } else {
143 printk(KERN_ERR "hfs: bad catalog entry type %d\n", type);
144 err = -EIO;
145 goto out;
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;
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;
161 filp->private_data = rd;
162 rd->file = filp;
163 list_add(&rd->list, &HFS_I(inode)->open_dir_list);
165 memcpy(&rd->key, &fd.key, sizeof(struct hfs_cat_key));
166 out:
167 hfs_find_exit(&fd);
168 return err;
171 static int hfs_dir_release(struct inode *inode, struct file *file)
173 struct hfs_readdir_data *rd = file->private_data;
174 if (rd) {
175 list_del(&rd->list);
176 kfree(rd);
178 return 0;
182 * hfs_create()
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.
189 static int hfs_create(struct inode *dir, struct dentry *dentry, int mode,
190 struct nameidata *nd)
192 struct inode *inode;
193 int res;
195 inode = hfs_new_inode(dir, &dentry->d_name, mode);
196 if (!inode)
197 return -ENOSPC;
199 res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
200 if (res) {
201 inode->i_nlink = 0;
202 hfs_delete_inode(inode);
203 iput(inode);
204 return res;
206 d_instantiate(dentry, inode);
207 mark_inode_dirty(inode);
208 return 0;
212 * hfs_mkdir()
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.
219 static int hfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
221 struct inode *inode;
222 int res;
224 inode = hfs_new_inode(dir, &dentry->d_name, S_IFDIR | mode);
225 if (!inode)
226 return -ENOSPC;
228 res = hfs_cat_create(inode->i_ino, dir, &dentry->d_name, inode);
229 if (res) {
230 inode->i_nlink = 0;
231 hfs_delete_inode(inode);
232 iput(inode);
233 return res;
235 d_instantiate(dentry, inode);
236 mark_inode_dirty(inode);
237 return 0;
241 * hfs_remove()
243 * 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.
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.
251 static int hfs_remove(struct inode *dir, struct dentry *dentry)
253 struct inode *inode = dentry->d_inode;
254 int res;
256 if (S_ISDIR(inode->i_mode) && inode->i_size != 2)
257 return -ENOTEMPTY;
258 res = hfs_cat_delete(inode->i_ino, dir, &dentry->d_name);
259 if (res)
260 return res;
261 clear_nlink(inode);
262 inode->i_ctime = CURRENT_TIME_SEC;
263 hfs_delete_inode(inode);
264 mark_inode_dirty(inode);
265 return 0;
269 * hfs_rename()
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?
279 static int hfs_rename(struct inode *old_dir, struct dentry *old_dentry,
280 struct inode *new_dir, struct dentry *new_dentry)
282 int res;
284 /* Unlink destination if it already exists */
285 if (new_dentry->d_inode) {
286 res = hfs_remove(new_dir, new_dentry);
287 if (res)
288 return res;
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)
295 hfs_cat_build_key(old_dir->i_sb,
296 (btree_key *)&HFS_I(old_dentry->d_inode)->cat_key,
297 new_dir->i_ino, &new_dentry->d_name);
298 return res;
301 const struct file_operations hfs_dir_operations = {
302 .read = generic_read_dir,
303 .readdir = hfs_readdir,
304 .llseek = generic_file_llseek,
305 .release = hfs_dir_release,
308 const struct inode_operations hfs_dir_inode_operations = {
309 .create = hfs_create,
310 .lookup = hfs_lookup,
311 .unlink = hfs_remove,
312 .mkdir = hfs_mkdir,
313 .rmdir = hfs_remove,
314 .rename = hfs_rename,
315 .setattr = hfs_inode_setattr,