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7#include "minix.h"
8
9static 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 }
16 inode_dec_link_count(inode);
17 iput(inode);
18 return err;
19}
20
21static struct dentry *minix_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd)
22{
23 struct inode * inode = NULL;
24 ino_t ino;
25
26 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) {
31 inode = minix_iget(dir->i_sb, ino);
32 if (IS_ERR(inode))
33 return ERR_CAST(inode);
34 }
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
47 inode = minix_new_inode(dir, mode, &error);
48
49 if (inode) {
50 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
73 inode = minix_new_inode(dir, S_IFLNK | 0777, &err);
74 if (!inode)
75 goto out;
76
77 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:
87 inode_dec_link_count(inode);
88 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;
101 inode_inc_link_count(inode);
102 ihold(inode);
103 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
114 inode_inc_link_count(dir);
115
116 inode = minix_new_inode(dir, S_IFDIR | mode, &err);
117 if (!inode)
118 goto out_dir;
119
120 minix_set_inode(inode, 0);
121
122 inode_inc_link_count(inode);
123
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:
137 inode_dec_link_count(inode);
138 inode_dec_link_count(inode);
139 iput(inode);
140out_dir:
141 inode_dec_link_count(dir);
142 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;
161 inode_dec_link_count(inode);
162end_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
171 if (minix_empty_dir(inode)) {
172 err = minix_unlink(dir, dentry);
173 if (!err) {
174 inode_dec_link_count(dir);
175 inode_dec_link_count(inode);
176 }
177 }
178 return err;
179}
180
181static int minix_rename(struct inode * old_dir, struct dentry *old_dentry,
182 struct inode * new_dir, struct dentry *new_dentry)
183{
184 struct minix_sb_info * info = minix_sb(old_dir->i_sb);
185 struct inode * old_inode = old_dentry->d_inode;
186 struct inode * new_inode = new_dentry->d_inode;
187 struct page * dir_page = NULL;
188 struct minix_dir_entry * dir_de = NULL;
189 struct page * old_page;
190 struct minix_dir_entry * old_de;
191 int err = -ENOENT;
192
193 old_de = minix_find_entry(old_dentry, &old_page);
194 if (!old_de)
195 goto out;
196
197 if (S_ISDIR(old_inode->i_mode)) {
198 err = -EIO;
199 dir_de = minix_dotdot(old_inode, &dir_page);
200 if (!dir_de)
201 goto out_old;
202 }
203
204 if (new_inode) {
205 struct page * new_page;
206 struct minix_dir_entry * new_de;
207
208 err = -ENOTEMPTY;
209 if (dir_de && !minix_empty_dir(new_inode))
210 goto out_dir;
211
212 err = -ENOENT;
213 new_de = minix_find_entry(new_dentry, &new_page);
214 if (!new_de)
215 goto out_dir;
216 minix_set_link(new_de, new_page, old_inode);
217 new_inode->i_ctime = CURRENT_TIME_SEC;
218 if (dir_de)
219 drop_nlink(new_inode);
220 inode_dec_link_count(new_inode);
221 } else {
222 if (dir_de) {
223 err = -EMLINK;
224 if (new_dir->i_nlink >= info->s_link_max)
225 goto out_dir;
226 }
227 err = minix_add_link(new_dentry, old_inode);
228 if (err)
229 goto out_dir;
230 if (dir_de)
231 inode_inc_link_count(new_dir);
232 }
233
234 minix_delete_entry(old_de, old_page);
235 mark_inode_dirty(old_inode);
236
237 if (dir_de) {
238 minix_set_link(dir_de, dir_page, new_dir);
239 inode_dec_link_count(old_dir);
240 }
241 return 0;
242
243out_dir:
244 if (dir_de) {
245 kunmap(dir_page);
246 page_cache_release(dir_page);
247 }
248out_old:
249 kunmap(old_page);
250 page_cache_release(old_page);
251out:
252 return err;
253}
254
255
256
257
258const struct inode_operations minix_dir_inode_operations = {
259 .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,
269};
270
