blob: 2887d1d95ce244e8ad59cd2585676888277958b3 [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 Howellsa90a08802008-02-07 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 Viro60545d02013-06-07 01:20:27 -040057static int minix_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
58{
59 int error;
60 struct inode *inode = minix_new_inode(dir, mode, &error);
61 if (inode) {
62 minix_set_inode(inode, 0);
63 mark_inode_dirty(inode);
64 d_tmpfile(dentry, inode);
65 }
66 return error;
67}
68
Al Viro4acdaf22011-07-26 01:42:34 -040069static int minix_create(struct inode *dir, struct dentry *dentry, umode_t mode,
Al Viroebfc3b42012-06-10 18:05:36 -040070 bool excl)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071{
72 return minix_mknod(dir, dentry, mode, 0);
73}
74
75static int minix_symlink(struct inode * dir, struct dentry *dentry,
76 const char * symname)
77{
78 int err = -ENAMETOOLONG;
79 int i = strlen(symname)+1;
80 struct inode * inode;
81
82 if (i > dir->i_sb->s_blocksize)
83 goto out;
84
Dmitry Monakhov9eed1fb2010-03-04 17:32:14 +030085 inode = minix_new_inode(dir, S_IFLNK | 0777, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 if (!inode)
87 goto out;
88
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 minix_set_inode(inode, 0);
90 err = page_symlink(inode, symname, i);
91 if (err)
92 goto out_fail;
93
94 err = add_nondir(dentry, inode);
95out:
96 return err;
97
98out_fail:
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -080099 inode_dec_link_count(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 iput(inode);
101 goto out;
102}
103
104static int minix_link(struct dentry * old_dentry, struct inode * dir,
105 struct dentry *dentry)
106{
David Howells2b0143b2015-03-17 22:25:59 +0000107 struct inode *inode = d_inode(old_dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 inode->i_ctime = CURRENT_TIME_SEC;
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800110 inode_inc_link_count(inode);
Al Viro7de9c6ee2010-10-23 11:11:40 -0400111 ihold(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 return add_nondir(dentry, inode);
113}
114
Al Viro18bb1db2011-07-26 01:41:39 -0400115static int minix_mkdir(struct inode * dir, struct dentry *dentry, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116{
117 struct inode * inode;
Al Viro8de52772012-02-06 12:45:27 -0500118 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800120 inode_inc_link_count(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
Jorge Boncompte [DTI2]eee743f2010-09-09 16:38:19 -0700122 inode = minix_new_inode(dir, S_IFDIR | mode, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 if (!inode)
124 goto out_dir;
125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 minix_set_inode(inode, 0);
127
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800128 inode_inc_link_count(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
130 err = minix_make_empty(inode, dir);
131 if (err)
132 goto out_fail;
133
134 err = minix_add_link(dentry, inode);
135 if (err)
136 goto out_fail;
137
138 d_instantiate(dentry, inode);
139out:
140 return err;
141
142out_fail:
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800143 inode_dec_link_count(inode);
144 inode_dec_link_count(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 iput(inode);
146out_dir:
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800147 inode_dec_link_count(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 goto out;
149}
150
151static int minix_unlink(struct inode * dir, struct dentry *dentry)
152{
153 int err = -ENOENT;
David Howells2b0143b2015-03-17 22:25:59 +0000154 struct inode * inode = d_inode(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 struct page * page;
156 struct minix_dir_entry * de;
157
158 de = minix_find_entry(dentry, &page);
159 if (!de)
160 goto end_unlink;
161
162 err = minix_delete_entry(de, page);
163 if (err)
164 goto end_unlink;
165
166 inode->i_ctime = dir->i_ctime;
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800167 inode_dec_link_count(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168end_unlink:
169 return err;
170}
171
172static int minix_rmdir(struct inode * dir, struct dentry *dentry)
173{
David Howells2b0143b2015-03-17 22:25:59 +0000174 struct inode * inode = d_inode(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 int err = -ENOTEMPTY;
176
177 if (minix_empty_dir(inode)) {
178 err = minix_unlink(dir, dentry);
179 if (!err) {
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800180 inode_dec_link_count(dir);
181 inode_dec_link_count(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 }
183 }
184 return err;
185}
186
187static int minix_rename(struct inode * old_dir, struct dentry *old_dentry,
188 struct inode * new_dir, struct dentry *new_dentry)
189{
David Howells2b0143b2015-03-17 22:25:59 +0000190 struct inode * old_inode = d_inode(old_dentry);
191 struct inode * new_inode = d_inode(new_dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 struct page * dir_page = NULL;
193 struct minix_dir_entry * dir_de = NULL;
194 struct page * old_page;
195 struct minix_dir_entry * old_de;
196 int err = -ENOENT;
197
198 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 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 err = minix_add_link(new_dentry, old_inode);
Al Viro6f880492011-03-02 09:41:38 -0500228 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 goto out_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 if (dir_de)
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800231 inode_inc_link_count(new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 }
233
234 minix_delete_entry(old_de, old_page);
Al Viro6f880492011-03-02 09:41:38 -0500235 mark_inode_dirty(old_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
237 if (dir_de) {
238 minix_set_link(dir_de, dir_page, new_dir);
Alexey Dobriyan78ec7b62006-03-23 03:00:51 -0800239 inode_dec_link_count(old_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 }
241 return 0;
242
243out_dir:
244 if (dir_de) {
245 kunmap(dir_page);
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300246 put_page(dir_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 }
248out_old:
249 kunmap(old_page);
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300250 put_page(old_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251out:
252 return err;
253}
254
255/*
256 * directories can handle most operations...
257 */
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800258const struct inode_operations minix_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 .create = minix_create,
260 .lookup = minix_lookup,
261 .link = minix_link,
262 .unlink = minix_unlink,
263 .symlink = minix_symlink,
264 .mkdir = minix_mkdir,
265 .rmdir = minix_rmdir,
266 .mknod = minix_mknod,
267 .rename = minix_rename,
268 .getattr = minix_getattr,
Al Viro60545d02013-06-07 01:20:27 -0400269 .tmpfile = minix_tmpfile,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270};