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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/sysv/namei.c | |
3 | * | |
4 | * minix/namei.c | |
5 | * Copyright (C) 1991, 1992 Linus Torvalds | |
6 | * | |
7 | * coh/namei.c | |
8 | * Copyright (C) 1993 Pascal Haible, Bruno Haible | |
9 | * | |
10 | * sysv/namei.c | |
11 | * Copyright (C) 1993 Bruno Haible | |
12 | * Copyright (C) 1997, 1998 Krzysztof G. Baranowski | |
13 | */ | |
14 | ||
15 | #include <linux/pagemap.h> | |
1da177e4 LT |
16 | #include "sysv.h" |
17 | ||
1da177e4 LT |
18 | static int add_nondir(struct dentry *dentry, struct inode *inode) |
19 | { | |
20 | int err = sysv_add_link(dentry, inode); | |
21 | if (!err) { | |
22 | d_instantiate(dentry, inode); | |
23 | return 0; | |
24 | } | |
4e907c3d | 25 | inode_dec_link_count(inode); |
1da177e4 LT |
26 | iput(inode); |
27 | return err; | |
28 | } | |
29 | ||
b1e6a015 NP |
30 | static int sysv_hash(const struct dentry *dentry, const struct inode *inode, |
31 | struct qstr *qstr) | |
1da177e4 LT |
32 | { |
33 | /* Truncate the name in place, avoids having to define a compare | |
34 | function. */ | |
35 | if (qstr->len > SYSV_NAMELEN) { | |
36 | qstr->len = SYSV_NAMELEN; | |
37 | qstr->hash = full_name_hash(qstr->name, qstr->len); | |
38 | } | |
39 | return 0; | |
40 | } | |
41 | ||
e16404ed | 42 | const struct dentry_operations sysv_dentry_operations = { |
1da177e4 LT |
43 | .d_hash = sysv_hash, |
44 | }; | |
45 | ||
00cd8dd3 | 46 | static struct dentry *sysv_lookup(struct inode * dir, struct dentry * dentry, unsigned int flags) |
1da177e4 LT |
47 | { |
48 | struct inode * inode = NULL; | |
49 | ino_t ino; | |
50 | ||
1da177e4 LT |
51 | if (dentry->d_name.len > SYSV_NAMELEN) |
52 | return ERR_PTR(-ENAMETOOLONG); | |
53 | ino = sysv_inode_by_name(dentry); | |
54 | ||
55 | if (ino) { | |
b8e1343f DH |
56 | inode = sysv_iget(dir->i_sb, ino); |
57 | if (IS_ERR(inode)) | |
58 | return ERR_CAST(inode); | |
1da177e4 LT |
59 | } |
60 | d_add(dentry, inode); | |
61 | return NULL; | |
62 | } | |
63 | ||
1a67aafb | 64 | static int sysv_mknod(struct inode * dir, struct dentry * dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
65 | { |
66 | struct inode * inode; | |
67 | int err; | |
68 | ||
69 | if (!old_valid_dev(rdev)) | |
70 | return -EINVAL; | |
71 | ||
72 | inode = sysv_new_inode(dir, mode); | |
73 | err = PTR_ERR(inode); | |
74 | ||
75 | if (!IS_ERR(inode)) { | |
76 | sysv_set_inode(inode, rdev); | |
77 | mark_inode_dirty(inode); | |
78 | err = add_nondir(dentry, inode); | |
79 | } | |
80 | return err; | |
81 | } | |
82 | ||
ebfc3b49 | 83 | static int sysv_create(struct inode * dir, struct dentry * dentry, umode_t mode, bool excl) |
1da177e4 LT |
84 | { |
85 | return sysv_mknod(dir, dentry, mode, 0); | |
86 | } | |
87 | ||
88 | static int sysv_symlink(struct inode * dir, struct dentry * dentry, | |
89 | const char * symname) | |
90 | { | |
91 | int err = -ENAMETOOLONG; | |
92 | int l = strlen(symname)+1; | |
93 | struct inode * inode; | |
94 | ||
95 | if (l > dir->i_sb->s_blocksize) | |
96 | goto out; | |
97 | ||
98 | inode = sysv_new_inode(dir, S_IFLNK|0777); | |
99 | err = PTR_ERR(inode); | |
100 | if (IS_ERR(inode)) | |
101 | goto out; | |
102 | ||
103 | sysv_set_inode(inode, 0); | |
104 | err = page_symlink(inode, symname, l); | |
105 | if (err) | |
106 | goto out_fail; | |
107 | ||
108 | mark_inode_dirty(inode); | |
109 | err = add_nondir(dentry, inode); | |
110 | out: | |
111 | return err; | |
112 | ||
113 | out_fail: | |
4e907c3d | 114 | inode_dec_link_count(inode); |
1da177e4 LT |
115 | iput(inode); |
116 | goto out; | |
117 | } | |
118 | ||
119 | static int sysv_link(struct dentry * old_dentry, struct inode * dir, | |
120 | struct dentry * dentry) | |
121 | { | |
122 | struct inode *inode = old_dentry->d_inode; | |
123 | ||
1da177e4 | 124 | inode->i_ctime = CURRENT_TIME_SEC; |
4e907c3d | 125 | inode_inc_link_count(inode); |
7de9c6ee | 126 | ihold(inode); |
1da177e4 LT |
127 | |
128 | return add_nondir(dentry, inode); | |
129 | } | |
130 | ||
18bb1db3 | 131 | static int sysv_mkdir(struct inode * dir, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
132 | { |
133 | struct inode * inode; | |
8de52778 | 134 | int err; |
1da177e4 | 135 | |
4e907c3d | 136 | inode_inc_link_count(dir); |
1da177e4 LT |
137 | |
138 | inode = sysv_new_inode(dir, S_IFDIR|mode); | |
139 | err = PTR_ERR(inode); | |
140 | if (IS_ERR(inode)) | |
141 | goto out_dir; | |
142 | ||
143 | sysv_set_inode(inode, 0); | |
144 | ||
4e907c3d | 145 | inode_inc_link_count(inode); |
1da177e4 LT |
146 | |
147 | err = sysv_make_empty(inode, dir); | |
148 | if (err) | |
149 | goto out_fail; | |
150 | ||
151 | err = sysv_add_link(dentry, inode); | |
152 | if (err) | |
153 | goto out_fail; | |
154 | ||
155 | d_instantiate(dentry, inode); | |
156 | out: | |
157 | return err; | |
158 | ||
159 | out_fail: | |
4e907c3d AD |
160 | inode_dec_link_count(inode); |
161 | inode_dec_link_count(inode); | |
1da177e4 LT |
162 | iput(inode); |
163 | out_dir: | |
4e907c3d | 164 | inode_dec_link_count(dir); |
1da177e4 LT |
165 | goto out; |
166 | } | |
167 | ||
168 | static int sysv_unlink(struct inode * dir, struct dentry * dentry) | |
169 | { | |
170 | struct inode * inode = dentry->d_inode; | |
171 | struct page * page; | |
172 | struct sysv_dir_entry * de; | |
173 | int err = -ENOENT; | |
174 | ||
175 | de = sysv_find_entry(dentry, &page); | |
176 | if (!de) | |
177 | goto out; | |
178 | ||
179 | err = sysv_delete_entry (de, page); | |
180 | if (err) | |
181 | goto out; | |
182 | ||
183 | inode->i_ctime = dir->i_ctime; | |
4e907c3d | 184 | inode_dec_link_count(inode); |
1da177e4 LT |
185 | out: |
186 | return err; | |
187 | } | |
188 | ||
189 | static int sysv_rmdir(struct inode * dir, struct dentry * dentry) | |
190 | { | |
191 | struct inode *inode = dentry->d_inode; | |
192 | int err = -ENOTEMPTY; | |
193 | ||
194 | if (sysv_empty_dir(inode)) { | |
195 | err = sysv_unlink(dir, dentry); | |
196 | if (!err) { | |
197 | inode->i_size = 0; | |
4e907c3d AD |
198 | inode_dec_link_count(inode); |
199 | inode_dec_link_count(dir); | |
1da177e4 LT |
200 | } |
201 | } | |
202 | return err; | |
203 | } | |
204 | ||
205 | /* | |
206 | * Anybody can rename anything with this: the permission checks are left to the | |
207 | * higher-level routines. | |
208 | */ | |
209 | static int sysv_rename(struct inode * old_dir, struct dentry * old_dentry, | |
210 | struct inode * new_dir, struct dentry * new_dentry) | |
211 | { | |
212 | struct inode * old_inode = old_dentry->d_inode; | |
213 | struct inode * new_inode = new_dentry->d_inode; | |
214 | struct page * dir_page = NULL; | |
215 | struct sysv_dir_entry * dir_de = NULL; | |
216 | struct page * old_page; | |
217 | struct sysv_dir_entry * old_de; | |
218 | int err = -ENOENT; | |
219 | ||
220 | old_de = sysv_find_entry(old_dentry, &old_page); | |
221 | if (!old_de) | |
222 | goto out; | |
223 | ||
224 | if (S_ISDIR(old_inode->i_mode)) { | |
225 | err = -EIO; | |
226 | dir_de = sysv_dotdot(old_inode, &dir_page); | |
227 | if (!dir_de) | |
228 | goto out_old; | |
229 | } | |
230 | ||
231 | if (new_inode) { | |
232 | struct page * new_page; | |
233 | struct sysv_dir_entry * new_de; | |
234 | ||
235 | err = -ENOTEMPTY; | |
236 | if (dir_de && !sysv_empty_dir(new_inode)) | |
237 | goto out_dir; | |
238 | ||
239 | err = -ENOENT; | |
240 | new_de = sysv_find_entry(new_dentry, &new_page); | |
241 | if (!new_de) | |
242 | goto out_dir; | |
1da177e4 LT |
243 | sysv_set_link(new_de, new_page, old_inode); |
244 | new_inode->i_ctime = CURRENT_TIME_SEC; | |
245 | if (dir_de) | |
9a53c3a7 | 246 | drop_nlink(new_inode); |
4e907c3d | 247 | inode_dec_link_count(new_inode); |
1da177e4 | 248 | } else { |
1da177e4 | 249 | err = sysv_add_link(new_dentry, old_inode); |
4787d45f | 250 | if (err) |
1da177e4 | 251 | goto out_dir; |
1da177e4 | 252 | if (dir_de) |
4e907c3d | 253 | inode_inc_link_count(new_dir); |
1da177e4 LT |
254 | } |
255 | ||
256 | sysv_delete_entry(old_de, old_page); | |
4787d45f | 257 | mark_inode_dirty(old_inode); |
1da177e4 LT |
258 | |
259 | if (dir_de) { | |
260 | sysv_set_link(dir_de, dir_page, new_dir); | |
4e907c3d | 261 | inode_dec_link_count(old_dir); |
1da177e4 LT |
262 | } |
263 | return 0; | |
264 | ||
265 | out_dir: | |
266 | if (dir_de) { | |
267 | kunmap(dir_page); | |
268 | page_cache_release(dir_page); | |
269 | } | |
270 | out_old: | |
271 | kunmap(old_page); | |
272 | page_cache_release(old_page); | |
273 | out: | |
274 | return err; | |
275 | } | |
276 | ||
277 | /* | |
278 | * directories can handle most operations... | |
279 | */ | |
c5ef1c42 | 280 | const struct inode_operations sysv_dir_inode_operations = { |
1da177e4 LT |
281 | .create = sysv_create, |
282 | .lookup = sysv_lookup, | |
283 | .link = sysv_link, | |
284 | .unlink = sysv_unlink, | |
285 | .symlink = sysv_symlink, | |
286 | .mkdir = sysv_mkdir, | |
287 | .rmdir = sysv_rmdir, | |
288 | .mknod = sysv_mknod, | |
289 | .rename = sysv_rename, | |
290 | .getattr = sysv_getattr, | |
291 | }; |