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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/minix/namei.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
7 | #include "minix.h" | |
8 | ||
1da177e4 LT |
9 | static 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 | } | |
78ec7b69 | 16 | inode_dec_link_count(inode); |
1da177e4 LT |
17 | iput(inode); |
18 | return err; | |
19 | } | |
20 | ||
1da177e4 LT |
21 | static 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 | dentry->d_op = dir->i_sb->s_root->d_op; | |
27 | ||
28 | if (dentry->d_name.len > minix_sb(dir->i_sb)->s_namelen) | |
29 | return ERR_PTR(-ENAMETOOLONG); | |
30 | ||
31 | ino = minix_inode_by_name(dentry); | |
32 | if (ino) { | |
a90a0880 DH |
33 | inode = minix_iget(dir->i_sb, ino); |
34 | if (IS_ERR(inode)) | |
35 | return ERR_CAST(inode); | |
1da177e4 LT |
36 | } |
37 | d_add(dentry, inode); | |
38 | return NULL; | |
39 | } | |
40 | ||
41 | static int minix_mknod(struct inode * dir, struct dentry *dentry, int mode, dev_t rdev) | |
42 | { | |
43 | int error; | |
44 | struct inode *inode; | |
45 | ||
46 | if (!old_valid_dev(rdev)) | |
47 | return -EINVAL; | |
48 | ||
49 | inode = minix_new_inode(dir, &error); | |
50 | ||
51 | if (inode) { | |
52 | inode->i_mode = mode; | |
53 | minix_set_inode(inode, rdev); | |
54 | mark_inode_dirty(inode); | |
55 | error = add_nondir(dentry, inode); | |
56 | } | |
57 | return error; | |
58 | } | |
59 | ||
60 | static int minix_create(struct inode * dir, struct dentry *dentry, int mode, | |
61 | struct nameidata *nd) | |
62 | { | |
63 | return minix_mknod(dir, dentry, mode, 0); | |
64 | } | |
65 | ||
66 | static int minix_symlink(struct inode * dir, struct dentry *dentry, | |
67 | const char * symname) | |
68 | { | |
69 | int err = -ENAMETOOLONG; | |
70 | int i = strlen(symname)+1; | |
71 | struct inode * inode; | |
72 | ||
73 | if (i > dir->i_sb->s_blocksize) | |
74 | goto out; | |
75 | ||
76 | inode = minix_new_inode(dir, &err); | |
77 | if (!inode) | |
78 | goto out; | |
79 | ||
80 | inode->i_mode = S_IFLNK | 0777; | |
81 | minix_set_inode(inode, 0); | |
82 | err = page_symlink(inode, symname, i); | |
83 | if (err) | |
84 | goto out_fail; | |
85 | ||
86 | err = add_nondir(dentry, inode); | |
87 | out: | |
88 | return err; | |
89 | ||
90 | out_fail: | |
78ec7b69 | 91 | inode_dec_link_count(inode); |
1da177e4 LT |
92 | iput(inode); |
93 | goto out; | |
94 | } | |
95 | ||
96 | static int minix_link(struct dentry * old_dentry, struct inode * dir, | |
97 | struct dentry *dentry) | |
98 | { | |
99 | struct inode *inode = old_dentry->d_inode; | |
100 | ||
101 | if (inode->i_nlink >= minix_sb(inode->i_sb)->s_link_max) | |
102 | return -EMLINK; | |
103 | ||
104 | inode->i_ctime = CURRENT_TIME_SEC; | |
78ec7b69 | 105 | inode_inc_link_count(inode); |
1da177e4 LT |
106 | atomic_inc(&inode->i_count); |
107 | return add_nondir(dentry, inode); | |
108 | } | |
109 | ||
110 | static int minix_mkdir(struct inode * dir, struct dentry *dentry, int mode) | |
111 | { | |
112 | struct inode * inode; | |
113 | int err = -EMLINK; | |
114 | ||
115 | if (dir->i_nlink >= minix_sb(dir->i_sb)->s_link_max) | |
116 | goto out; | |
117 | ||
78ec7b69 | 118 | inode_inc_link_count(dir); |
1da177e4 LT |
119 | |
120 | inode = minix_new_inode(dir, &err); | |
121 | if (!inode) | |
122 | goto out_dir; | |
123 | ||
124 | inode->i_mode = S_IFDIR | mode; | |
125 | if (dir->i_mode & S_ISGID) | |
126 | inode->i_mode |= S_ISGID; | |
127 | minix_set_inode(inode, 0); | |
128 | ||
78ec7b69 | 129 | inode_inc_link_count(inode); |
1da177e4 LT |
130 | |
131 | err = minix_make_empty(inode, dir); | |
132 | if (err) | |
133 | goto out_fail; | |
134 | ||
135 | err = minix_add_link(dentry, inode); | |
136 | if (err) | |
137 | goto out_fail; | |
138 | ||
139 | d_instantiate(dentry, inode); | |
140 | out: | |
141 | return err; | |
142 | ||
143 | out_fail: | |
78ec7b69 AD |
144 | inode_dec_link_count(inode); |
145 | inode_dec_link_count(inode); | |
1da177e4 LT |
146 | iput(inode); |
147 | out_dir: | |
78ec7b69 | 148 | inode_dec_link_count(dir); |
1da177e4 LT |
149 | goto out; |
150 | } | |
151 | ||
152 | static int minix_unlink(struct inode * dir, struct dentry *dentry) | |
153 | { | |
154 | int err = -ENOENT; | |
155 | struct inode * inode = dentry->d_inode; | |
156 | struct page * page; | |
157 | struct minix_dir_entry * de; | |
158 | ||
159 | de = minix_find_entry(dentry, &page); | |
160 | if (!de) | |
161 | goto end_unlink; | |
162 | ||
163 | err = minix_delete_entry(de, page); | |
164 | if (err) | |
165 | goto end_unlink; | |
166 | ||
167 | inode->i_ctime = dir->i_ctime; | |
78ec7b69 | 168 | inode_dec_link_count(inode); |
1da177e4 LT |
169 | end_unlink: |
170 | return err; | |
171 | } | |
172 | ||
173 | static int minix_rmdir(struct inode * dir, struct dentry *dentry) | |
174 | { | |
175 | struct inode * inode = dentry->d_inode; | |
176 | int err = -ENOTEMPTY; | |
177 | ||
178 | if (minix_empty_dir(inode)) { | |
179 | err = minix_unlink(dir, dentry); | |
180 | if (!err) { | |
78ec7b69 AD |
181 | inode_dec_link_count(dir); |
182 | inode_dec_link_count(inode); | |
1da177e4 LT |
183 | } |
184 | } | |
185 | return err; | |
186 | } | |
187 | ||
188 | static int minix_rename(struct inode * old_dir, struct dentry *old_dentry, | |
189 | struct inode * new_dir, struct dentry *new_dentry) | |
190 | { | |
191 | struct minix_sb_info * info = minix_sb(old_dir->i_sb); | |
192 | struct inode * old_inode = old_dentry->d_inode; | |
193 | struct inode * new_inode = new_dentry->d_inode; | |
194 | struct page * dir_page = NULL; | |
195 | struct minix_dir_entry * dir_de = NULL; | |
196 | struct page * old_page; | |
197 | struct minix_dir_entry * old_de; | |
198 | int err = -ENOENT; | |
199 | ||
200 | old_de = minix_find_entry(old_dentry, &old_page); | |
201 | if (!old_de) | |
202 | goto out; | |
203 | ||
204 | if (S_ISDIR(old_inode->i_mode)) { | |
205 | err = -EIO; | |
206 | dir_de = minix_dotdot(old_inode, &dir_page); | |
207 | if (!dir_de) | |
208 | goto out_old; | |
209 | } | |
210 | ||
211 | if (new_inode) { | |
212 | struct page * new_page; | |
213 | struct minix_dir_entry * new_de; | |
214 | ||
215 | err = -ENOTEMPTY; | |
216 | if (dir_de && !minix_empty_dir(new_inode)) | |
217 | goto out_dir; | |
218 | ||
219 | err = -ENOENT; | |
220 | new_de = minix_find_entry(new_dentry, &new_page); | |
221 | if (!new_de) | |
222 | goto out_dir; | |
78ec7b69 | 223 | inode_inc_link_count(old_inode); |
1da177e4 LT |
224 | minix_set_link(new_de, new_page, old_inode); |
225 | new_inode->i_ctime = CURRENT_TIME_SEC; | |
226 | if (dir_de) | |
9a53c3a7 | 227 | drop_nlink(new_inode); |
78ec7b69 | 228 | inode_dec_link_count(new_inode); |
1da177e4 LT |
229 | } else { |
230 | if (dir_de) { | |
231 | err = -EMLINK; | |
232 | if (new_dir->i_nlink >= info->s_link_max) | |
233 | goto out_dir; | |
234 | } | |
78ec7b69 | 235 | inode_inc_link_count(old_inode); |
1da177e4 LT |
236 | err = minix_add_link(new_dentry, old_inode); |
237 | if (err) { | |
78ec7b69 | 238 | inode_dec_link_count(old_inode); |
1da177e4 LT |
239 | goto out_dir; |
240 | } | |
241 | if (dir_de) | |
78ec7b69 | 242 | inode_inc_link_count(new_dir); |
1da177e4 LT |
243 | } |
244 | ||
245 | minix_delete_entry(old_de, old_page); | |
78ec7b69 | 246 | inode_dec_link_count(old_inode); |
1da177e4 LT |
247 | |
248 | if (dir_de) { | |
249 | minix_set_link(dir_de, dir_page, new_dir); | |
78ec7b69 | 250 | inode_dec_link_count(old_dir); |
1da177e4 LT |
251 | } |
252 | return 0; | |
253 | ||
254 | out_dir: | |
255 | if (dir_de) { | |
256 | kunmap(dir_page); | |
257 | page_cache_release(dir_page); | |
258 | } | |
259 | out_old: | |
260 | kunmap(old_page); | |
261 | page_cache_release(old_page); | |
262 | out: | |
263 | return err; | |
264 | } | |
265 | ||
266 | /* | |
267 | * directories can handle most operations... | |
268 | */ | |
92e1d5be | 269 | const struct inode_operations minix_dir_inode_operations = { |
1da177e4 LT |
270 | .create = minix_create, |
271 | .lookup = minix_lookup, | |
272 | .link = minix_link, | |
273 | .unlink = minix_unlink, | |
274 | .symlink = minix_symlink, | |
275 | .mkdir = minix_mkdir, | |
276 | .rmdir = minix_rmdir, | |
277 | .mknod = minix_mknod, | |
278 | .rename = minix_rename, | |
279 | .getattr = minix_getattr, | |
280 | }; |