blob: 0db73d9dd66845d289f6f1a58e1960ecc1ee3e74 [file] [log] [blame]
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
Al Viro00cd8dd2012-06-10 17:13:09 -040021static struct dentry *minix_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070022{
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
Al Viro1a67aaf2011-07-26 01:52:52 -040039static int minix_mknod(struct inode * dir, struct dentry *dentry, umode_t mode, dev_t rdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070040{
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
Al Viro4acdaf22011-07-26 01:42:34 -040057static int minix_create(struct inode *dir, struct dentry *dentry, umode_t mode,
Al Viroebfc3b42012-06-10 18:05:36 -040058 bool excl)
Linus Torvalds1da177e2005-04-16 15:20:36 -070059{
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 inode->i_ctime = CURRENT_TIME_SEC;
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -080098 inode_inc_link_count(inode);
Al Viro7de9c6ee2010-10-23 11:11:40 -040099 ihold(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 return add_nondir(dentry, inode);
101}
102
Al Viro18bb1db2011-07-26 01:41:39 -0400103static int minix_mkdir(struct inode * dir, struct dentry *dentry, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104{
105 struct inode * inode;
Al Viro8de52772012-02-06 12:45:27 -0500106 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800108 inode_inc_link_count(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
Jorge Boncompte [DTI2]eee743f2010-09-09 16:38:19 -0700110 inode = minix_new_inode(dir, S_IFDIR | mode, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 if (!inode)
112 goto out_dir;
113
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 minix_set_inode(inode, 0);
115
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800116 inode_inc_link_count(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
118 err = minix_make_empty(inode, dir);
119 if (err)
120 goto out_fail;
121
122 err = minix_add_link(dentry, inode);
123 if (err)
124 goto out_fail;
125
126 d_instantiate(dentry, inode);
127out:
128 return err;
129
130out_fail:
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800131 inode_dec_link_count(inode);
132 inode_dec_link_count(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 iput(inode);
134out_dir:
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800135 inode_dec_link_count(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 goto out;
137}
138
139static int minix_unlink(struct inode * dir, struct dentry *dentry)
140{
141 int err = -ENOENT;
142 struct inode * inode = dentry->d_inode;
143 struct page * page;
144 struct minix_dir_entry * de;
145
146 de = minix_find_entry(dentry, &page);
147 if (!de)
148 goto end_unlink;
149
150 err = minix_delete_entry(de, page);
151 if (err)
152 goto end_unlink;
153
154 inode->i_ctime = dir->i_ctime;
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800155 inode_dec_link_count(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156end_unlink:
157 return err;
158}
159
160static int minix_rmdir(struct inode * dir, struct dentry *dentry)
161{
162 struct inode * inode = dentry->d_inode;
163 int err = -ENOTEMPTY;
164
165 if (minix_empty_dir(inode)) {
166 err = minix_unlink(dir, dentry);
167 if (!err) {
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800168 inode_dec_link_count(dir);
169 inode_dec_link_count(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 }
171 }
172 return err;
173}
174
175static int minix_rename(struct inode * old_dir, struct dentry *old_dentry,
176 struct inode * new_dir, struct dentry *new_dentry)
177{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 struct inode * old_inode = old_dentry->d_inode;
179 struct inode * new_inode = new_dentry->d_inode;
180 struct page * dir_page = NULL;
181 struct minix_dir_entry * dir_de = NULL;
182 struct page * old_page;
183 struct minix_dir_entry * old_de;
184 int err = -ENOENT;
185
186 old_de = minix_find_entry(old_dentry, &old_page);
187 if (!old_de)
188 goto out;
189
190 if (S_ISDIR(old_inode->i_mode)) {
191 err = -EIO;
192 dir_de = minix_dotdot(old_inode, &dir_page);
193 if (!dir_de)
194 goto out_old;
195 }
196
197 if (new_inode) {
198 struct page * new_page;
199 struct minix_dir_entry * new_de;
200
201 err = -ENOTEMPTY;
202 if (dir_de && !minix_empty_dir(new_inode))
203 goto out_dir;
204
205 err = -ENOENT;
206 new_de = minix_find_entry(new_dentry, &new_page);
207 if (!new_de)
208 goto out_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 minix_set_link(new_de, new_page, old_inode);
210 new_inode->i_ctime = CURRENT_TIME_SEC;
211 if (dir_de)
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700212 drop_nlink(new_inode);
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800213 inode_dec_link_count(new_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 err = minix_add_link(new_dentry, old_inode);
Al Viro6f880492011-03-02 09:41:38 -0500216 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 goto out_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 if (dir_de)
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800219 inode_inc_link_count(new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 }
221
222 minix_delete_entry(old_de, old_page);
Al Viro6f880492011-03-02 09:41:38 -0500223 mark_inode_dirty(old_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
225 if (dir_de) {
226 minix_set_link(dir_de, dir_page, new_dir);
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800227 inode_dec_link_count(old_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 }
229 return 0;
230
231out_dir:
232 if (dir_de) {
233 kunmap(dir_page);
234 page_cache_release(dir_page);
235 }
236out_old:
237 kunmap(old_page);
238 page_cache_release(old_page);
239out:
240 return err;
241}
242
243/*
244 * directories can handle most operations...
245 */
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800246const struct inode_operations minix_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 .create = minix_create,
248 .lookup = minix_lookup,
249 .link = minix_link,
250 .unlink = minix_unlink,
251 .symlink = minix_symlink,
252 .mkdir = minix_mkdir,
253 .rmdir = minix_rmdir,
254 .mknod = minix_mknod,
255 .rename = minix_rename,
256 .getattr = minix_getattr,
257};