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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/minix/namei.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
7#include "minix.h"
8
Linus Torvalds1da177e2005-04-16 15:20:36 -07009static int add_nondir(struct dentry *dentry, struct inode *inode)
10{
11 int err = minix_add_link(dentry, inode);
12 if (!err) {
13 d_instantiate(dentry, inode);
14 return 0;
15 }
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -080016 inode_dec_link_count(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 iput(inode);
18 return err;
19}
20
Linus Torvalds1da177e2005-04-16 15:20:36 -070021static struct dentry *minix_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd)
22{
23 struct inode * inode = NULL;
24 ino_t ino;
25
Linus Torvalds1da177e2005-04-16 15:20:36 -070026 if (dentry->d_name.len > minix_sb(dir->i_sb)->s_namelen)
27 return ERR_PTR(-ENAMETOOLONG);
28
29 ino = minix_inode_by_name(dentry);
30 if (ino) {
David Howellsa90a0882008-02-07 00:15:44 -080031 inode = minix_iget(dir->i_sb, ino);
32 if (IS_ERR(inode))
33 return ERR_CAST(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 }
35 d_add(dentry, inode);
36 return NULL;
37}
38
39static int minix_mknod(struct inode * dir, struct dentry *dentry, int mode, dev_t rdev)
40{
41 int error;
42 struct inode *inode;
43
44 if (!old_valid_dev(rdev))
45 return -EINVAL;
46
Dmitry Monakhov9eed1fb2010-03-04 17:32:14 +030047 inode = minix_new_inode(dir, mode, &error);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
49 if (inode) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 minix_set_inode(inode, rdev);
51 mark_inode_dirty(inode);
52 error = add_nondir(dentry, inode);
53 }
54 return error;
55}
56
57static int minix_create(struct inode * dir, struct dentry *dentry, int mode,
58 struct nameidata *nd)
59{
60 return minix_mknod(dir, dentry, mode, 0);
61}
62
63static int minix_symlink(struct inode * dir, struct dentry *dentry,
64 const char * symname)
65{
66 int err = -ENAMETOOLONG;
67 int i = strlen(symname)+1;
68 struct inode * inode;
69
70 if (i > dir->i_sb->s_blocksize)
71 goto out;
72
Dmitry Monakhov9eed1fb2010-03-04 17:32:14 +030073 inode = minix_new_inode(dir, S_IFLNK | 0777, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 if (!inode)
75 goto out;
76
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 minix_set_inode(inode, 0);
78 err = page_symlink(inode, symname, i);
79 if (err)
80 goto out_fail;
81
82 err = add_nondir(dentry, inode);
83out:
84 return err;
85
86out_fail:
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -080087 inode_dec_link_count(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 iput(inode);
89 goto out;
90}
91
92static int minix_link(struct dentry * old_dentry, struct inode * dir,
93 struct dentry *dentry)
94{
95 struct inode *inode = old_dentry->d_inode;
96
97 if (inode->i_nlink >= minix_sb(inode->i_sb)->s_link_max)
98 return -EMLINK;
99
100 inode->i_ctime = CURRENT_TIME_SEC;
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800101 inode_inc_link_count(inode);
Al Viro7de9c6e2010-10-23 11:11:40 -0400102 ihold(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 return add_nondir(dentry, inode);
104}
105
106static int minix_mkdir(struct inode * dir, struct dentry *dentry, int mode)
107{
108 struct inode * inode;
109 int err = -EMLINK;
110
111 if (dir->i_nlink >= minix_sb(dir->i_sb)->s_link_max)
112 goto out;
113
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800114 inode_inc_link_count(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
Jorge Boncompte [DTI2]eee743f2010-09-09 16:38:19 -0700116 inode = minix_new_inode(dir, S_IFDIR | mode, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 if (!inode)
118 goto out_dir;
119
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 minix_set_inode(inode, 0);
121
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800122 inode_inc_link_count(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
124 err = minix_make_empty(inode, dir);
125 if (err)
126 goto out_fail;
127
128 err = minix_add_link(dentry, inode);
129 if (err)
130 goto out_fail;
131
132 d_instantiate(dentry, inode);
133out:
134 return err;
135
136out_fail:
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800137 inode_dec_link_count(inode);
138 inode_dec_link_count(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 iput(inode);
140out_dir:
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800141 inode_dec_link_count(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 goto out;
143}
144
145static int minix_unlink(struct inode * dir, struct dentry *dentry)
146{
147 int err = -ENOENT;
148 struct inode * inode = dentry->d_inode;
149 struct page * page;
150 struct minix_dir_entry * de;
151
152 de = minix_find_entry(dentry, &page);
153 if (!de)
154 goto end_unlink;
155
156 err = minix_delete_entry(de, page);
157 if (err)
158 goto end_unlink;
159
160 inode->i_ctime = dir->i_ctime;
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800161 inode_dec_link_count(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162end_unlink:
163 return err;
164}
165
166static int minix_rmdir(struct inode * dir, struct dentry *dentry)
167{
168 struct inode * inode = dentry->d_inode;
169 int err = -ENOTEMPTY;
170
Sage Weil79bf7c72011-05-24 13:06:06 -0700171 dentry_unhash(dentry);
172
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 if (minix_empty_dir(inode)) {
174 err = minix_unlink(dir, dentry);
175 if (!err) {
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800176 inode_dec_link_count(dir);
177 inode_dec_link_count(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 }
179 }
180 return err;
181}
182
183static int minix_rename(struct inode * old_dir, struct dentry *old_dentry,
184 struct inode * new_dir, struct dentry *new_dentry)
185{
186 struct minix_sb_info * info = minix_sb(old_dir->i_sb);
187 struct inode * old_inode = old_dentry->d_inode;
188 struct inode * new_inode = new_dentry->d_inode;
189 struct page * dir_page = NULL;
190 struct minix_dir_entry * dir_de = NULL;
191 struct page * old_page;
192 struct minix_dir_entry * old_de;
193 int err = -ENOENT;
194
Sage Weile4eaac02011-05-24 13:06:07 -0700195 if (new_inode && S_ISDIR(new_inode->i_mode))
196 dentry_unhash(new_dentry);
197
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 old_de = minix_find_entry(old_dentry, &old_page);
199 if (!old_de)
200 goto out;
201
202 if (S_ISDIR(old_inode->i_mode)) {
203 err = -EIO;
204 dir_de = minix_dotdot(old_inode, &dir_page);
205 if (!dir_de)
206 goto out_old;
207 }
208
209 if (new_inode) {
210 struct page * new_page;
211 struct minix_dir_entry * new_de;
212
213 err = -ENOTEMPTY;
214 if (dir_de && !minix_empty_dir(new_inode))
215 goto out_dir;
216
217 err = -ENOENT;
218 new_de = minix_find_entry(new_dentry, &new_page);
219 if (!new_de)
220 goto out_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 minix_set_link(new_de, new_page, old_inode);
222 new_inode->i_ctime = CURRENT_TIME_SEC;
223 if (dir_de)
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700224 drop_nlink(new_inode);
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800225 inode_dec_link_count(new_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 } else {
227 if (dir_de) {
228 err = -EMLINK;
229 if (new_dir->i_nlink >= info->s_link_max)
230 goto out_dir;
231 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 err = minix_add_link(new_dentry, old_inode);
Al Viro6f880492011-03-02 09:41:38 -0500233 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 goto out_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 if (dir_de)
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800236 inode_inc_link_count(new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 }
238
239 minix_delete_entry(old_de, old_page);
Al Viro6f880492011-03-02 09:41:38 -0500240 mark_inode_dirty(old_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
242 if (dir_de) {
243 minix_set_link(dir_de, dir_page, new_dir);
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800244 inode_dec_link_count(old_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 }
246 return 0;
247
248out_dir:
249 if (dir_de) {
250 kunmap(dir_page);
251 page_cache_release(dir_page);
252 }
253out_old:
254 kunmap(old_page);
255 page_cache_release(old_page);
256out:
257 return err;
258}
259
260/*
261 * directories can handle most operations...
262 */
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800263const struct inode_operations minix_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 .create = minix_create,
265 .lookup = minix_lookup,
266 .link = minix_link,
267 .unlink = minix_unlink,
268 .symlink = minix_symlink,
269 .mkdir = minix_mkdir,
270 .rmdir = minix_rmdir,
271 .mknod = minix_mknod,
272 .rename = minix_rename,
273 .getattr = minix_getattr,
274};