Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/ufs/namei.c | |
3 | * | |
b71034e5 ED |
4 | * Migration to usage of "page cache" on May 2006 by |
5 | * Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base. | |
6 | * | |
1da177e4 LT |
7 | * Copyright (C) 1998 |
8 | * Daniel Pirkl <daniel.pirkl@email.cz> | |
9 | * Charles University, Faculty of Mathematics and Physics | |
10 | * | |
11 | * from | |
12 | * | |
13 | * linux/fs/ext2/namei.c | |
14 | * | |
15 | * Copyright (C) 1992, 1993, 1994, 1995 | |
16 | * Remy Card (card@masi.ibp.fr) | |
17 | * Laboratoire MASI - Institut Blaise Pascal | |
18 | * Universite Pierre et Marie Curie (Paris VI) | |
19 | * | |
20 | * from | |
21 | * | |
22 | * linux/fs/minix/namei.c | |
23 | * | |
24 | * Copyright (C) 1991, 1992 Linus Torvalds | |
25 | * | |
26 | * Big-endian to little-endian byte-swapping/bitmaps by | |
27 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
28 | */ | |
29 | ||
30 | #include <linux/time.h> | |
31 | #include <linux/fs.h> | |
e5420598 MF |
32 | |
33 | #include "ufs_fs.h" | |
bcd6d4ec | 34 | #include "ufs.h" |
1da177e4 LT |
35 | #include "util.h" |
36 | ||
1da177e4 LT |
37 | static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode) |
38 | { | |
39 | int err = ufs_add_link(dentry, inode); | |
40 | if (!err) { | |
41 | d_instantiate(dentry, inode); | |
42 | return 0; | |
43 | } | |
3257545e | 44 | inode_dec_link_count(inode); |
1da177e4 LT |
45 | iput(inode); |
46 | return err; | |
47 | } | |
48 | ||
00cd8dd3 | 49 | static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
50 | { |
51 | struct inode * inode = NULL; | |
52 | ino_t ino; | |
53 | ||
54 | if (dentry->d_name.len > UFS_MAXNAMLEN) | |
55 | return ERR_PTR(-ENAMETOOLONG); | |
56 | ||
788257d6 | 57 | lock_ufs(dir->i_sb); |
08049707 | 58 | ino = ufs_inode_by_name(dir, &dentry->d_name); |
642c937b | 59 | if (ino) |
b55c460d | 60 | inode = ufs_iget(dir->i_sb, ino); |
788257d6 | 61 | unlock_ufs(dir->i_sb); |
642c937b | 62 | return d_splice_alias(inode, dentry); |
1da177e4 LT |
63 | } |
64 | ||
65 | /* | |
66 | * By the time this is called, we already have created | |
67 | * the directory cache entry for the new file, but it | |
68 | * is so far negative - it has no inode. | |
69 | * | |
70 | * If the create succeeds, we fill in the inode information | |
71 | * with d_instantiate(). | |
72 | */ | |
4acdaf27 | 73 | static int ufs_create (struct inode * dir, struct dentry * dentry, umode_t mode, |
ebfc3b49 | 74 | bool excl) |
1da177e4 | 75 | { |
abf5d15f ED |
76 | struct inode *inode; |
77 | int err; | |
78 | ||
79 | UFSD("BEGIN\n"); | |
907f4554 | 80 | |
abf5d15f ED |
81 | inode = ufs_new_inode(dir, mode); |
82 | err = PTR_ERR(inode); | |
83 | ||
1da177e4 LT |
84 | if (!IS_ERR(inode)) { |
85 | inode->i_op = &ufs_file_inode_operations; | |
86 | inode->i_fop = &ufs_file_operations; | |
87 | inode->i_mapping->a_ops = &ufs_aops; | |
88 | mark_inode_dirty(inode); | |
788257d6 | 89 | lock_ufs(dir->i_sb); |
1da177e4 | 90 | err = ufs_add_nondir(dentry, inode); |
788257d6 | 91 | unlock_ufs(dir->i_sb); |
1da177e4 | 92 | } |
abf5d15f | 93 | UFSD("END: err=%d\n", err); |
1da177e4 LT |
94 | return err; |
95 | } | |
96 | ||
1a67aafb | 97 | static int ufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) |
1da177e4 LT |
98 | { |
99 | struct inode *inode; | |
100 | int err; | |
101 | ||
102 | if (!old_valid_dev(rdev)) | |
103 | return -EINVAL; | |
907f4554 | 104 | |
1da177e4 LT |
105 | inode = ufs_new_inode(dir, mode); |
106 | err = PTR_ERR(inode); | |
107 | if (!IS_ERR(inode)) { | |
108 | init_special_inode(inode, mode, rdev); | |
1da177e4 LT |
109 | ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev); |
110 | mark_inode_dirty(inode); | |
788257d6 | 111 | lock_ufs(dir->i_sb); |
1da177e4 | 112 | err = ufs_add_nondir(dentry, inode); |
788257d6 | 113 | unlock_ufs(dir->i_sb); |
1da177e4 LT |
114 | } |
115 | return err; | |
116 | } | |
117 | ||
118 | static int ufs_symlink (struct inode * dir, struct dentry * dentry, | |
119 | const char * symname) | |
120 | { | |
121 | struct super_block * sb = dir->i_sb; | |
122 | int err = -ENAMETOOLONG; | |
123 | unsigned l = strlen(symname)+1; | |
124 | struct inode * inode; | |
125 | ||
126 | if (l > sb->s_blocksize) | |
344fe786 | 127 | goto out_notlocked; |
1da177e4 | 128 | |
1da177e4 LT |
129 | inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO); |
130 | err = PTR_ERR(inode); | |
131 | if (IS_ERR(inode)) | |
9ef7db7f | 132 | goto out_notlocked; |
1da177e4 | 133 | |
9ef7db7f | 134 | lock_ufs(dir->i_sb); |
1da177e4 LT |
135 | if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) { |
136 | /* slow symlink */ | |
311b9549 | 137 | inode->i_op = &ufs_symlink_inode_operations; |
1da177e4 LT |
138 | inode->i_mapping->a_ops = &ufs_aops; |
139 | err = page_symlink(inode, symname, l); | |
140 | if (err) | |
141 | goto out_fail; | |
142 | } else { | |
143 | /* fast symlink */ | |
144 | inode->i_op = &ufs_fast_symlink_inode_operations; | |
723be1f3 | 145 | memcpy(UFS_I(inode)->i_u1.i_symlink, symname, l); |
1da177e4 LT |
146 | inode->i_size = l-1; |
147 | } | |
148 | mark_inode_dirty(inode); | |
149 | ||
150 | err = ufs_add_nondir(dentry, inode); | |
151 | out: | |
788257d6 | 152 | unlock_ufs(dir->i_sb); |
344fe786 | 153 | out_notlocked: |
1da177e4 LT |
154 | return err; |
155 | ||
156 | out_fail: | |
3257545e | 157 | inode_dec_link_count(inode); |
1da177e4 LT |
158 | iput(inode); |
159 | goto out; | |
160 | } | |
161 | ||
162 | static int ufs_link (struct dentry * old_dentry, struct inode * dir, | |
163 | struct dentry *dentry) | |
164 | { | |
165 | struct inode *inode = old_dentry->d_inode; | |
166 | int error; | |
167 | ||
788257d6 | 168 | lock_ufs(dir->i_sb); |
1da177e4 LT |
169 | |
170 | inode->i_ctime = CURRENT_TIME_SEC; | |
3257545e | 171 | inode_inc_link_count(inode); |
7de9c6ee | 172 | ihold(inode); |
1da177e4 LT |
173 | |
174 | error = ufs_add_nondir(dentry, inode); | |
788257d6 | 175 | unlock_ufs(dir->i_sb); |
1da177e4 LT |
176 | return error; |
177 | } | |
178 | ||
18bb1db3 | 179 | static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode) |
1da177e4 LT |
180 | { |
181 | struct inode * inode; | |
8de52778 | 182 | int err; |
1da177e4 | 183 | |
1da177e4 | 184 | inode = ufs_new_inode(dir, S_IFDIR|mode); |
1da177e4 | 185 | if (IS_ERR(inode)) |
9ef7db7f | 186 | return PTR_ERR(inode); |
1da177e4 LT |
187 | |
188 | inode->i_op = &ufs_dir_inode_operations; | |
189 | inode->i_fop = &ufs_dir_operations; | |
826843a3 | 190 | inode->i_mapping->a_ops = &ufs_aops; |
1da177e4 | 191 | |
3257545e | 192 | inode_inc_link_count(inode); |
1da177e4 | 193 | |
9ef7db7f AK |
194 | lock_ufs(dir->i_sb); |
195 | inode_inc_link_count(dir); | |
196 | ||
1da177e4 LT |
197 | err = ufs_make_empty(inode, dir); |
198 | if (err) | |
199 | goto out_fail; | |
200 | ||
201 | err = ufs_add_link(dentry, inode); | |
202 | if (err) | |
203 | goto out_fail; | |
788257d6 | 204 | unlock_ufs(dir->i_sb); |
1da177e4 LT |
205 | |
206 | d_instantiate(dentry, inode); | |
207 | out: | |
208 | return err; | |
209 | ||
210 | out_fail: | |
3257545e AD |
211 | inode_dec_link_count(inode); |
212 | inode_dec_link_count(inode); | |
1da177e4 | 213 | iput (inode); |
3257545e | 214 | inode_dec_link_count(dir); |
788257d6 | 215 | unlock_ufs(dir->i_sb); |
1da177e4 LT |
216 | goto out; |
217 | } | |
218 | ||
b71034e5 | 219 | static int ufs_unlink(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
220 | { |
221 | struct inode * inode = dentry->d_inode; | |
b71034e5 ED |
222 | struct ufs_dir_entry *de; |
223 | struct page *page; | |
1da177e4 LT |
224 | int err = -ENOENT; |
225 | ||
08049707 | 226 | de = ufs_find_entry(dir, &dentry->d_name, &page); |
1da177e4 LT |
227 | if (!de) |
228 | goto out; | |
229 | ||
b71034e5 | 230 | err = ufs_delete_entry(dir, de, page); |
1da177e4 LT |
231 | if (err) |
232 | goto out; | |
233 | ||
234 | inode->i_ctime = dir->i_ctime; | |
3257545e | 235 | inode_dec_link_count(inode); |
1da177e4 LT |
236 | err = 0; |
237 | out: | |
1da177e4 LT |
238 | return err; |
239 | } | |
240 | ||
241 | static int ufs_rmdir (struct inode * dir, struct dentry *dentry) | |
242 | { | |
243 | struct inode * inode = dentry->d_inode; | |
244 | int err= -ENOTEMPTY; | |
245 | ||
788257d6 | 246 | lock_ufs(dir->i_sb); |
1da177e4 LT |
247 | if (ufs_empty_dir (inode)) { |
248 | err = ufs_unlink(dir, dentry); | |
249 | if (!err) { | |
250 | inode->i_size = 0; | |
3257545e AD |
251 | inode_dec_link_count(inode); |
252 | inode_dec_link_count(dir); | |
1da177e4 LT |
253 | } |
254 | } | |
788257d6 | 255 | unlock_ufs(dir->i_sb); |
1da177e4 LT |
256 | return err; |
257 | } | |
258 | ||
b71034e5 ED |
259 | static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry, |
260 | struct inode *new_dir, struct dentry *new_dentry) | |
1da177e4 LT |
261 | { |
262 | struct inode *old_inode = old_dentry->d_inode; | |
263 | struct inode *new_inode = new_dentry->d_inode; | |
b71034e5 ED |
264 | struct page *dir_page = NULL; |
265 | struct ufs_dir_entry * dir_de = NULL; | |
266 | struct page *old_page; | |
1da177e4 LT |
267 | struct ufs_dir_entry *old_de; |
268 | int err = -ENOENT; | |
269 | ||
08049707 | 270 | old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page); |
1da177e4 LT |
271 | if (!old_de) |
272 | goto out; | |
273 | ||
274 | if (S_ISDIR(old_inode->i_mode)) { | |
275 | err = -EIO; | |
b71034e5 | 276 | dir_de = ufs_dotdot(old_inode, &dir_page); |
1da177e4 LT |
277 | if (!dir_de) |
278 | goto out_old; | |
279 | } | |
280 | ||
281 | if (new_inode) { | |
b71034e5 | 282 | struct page *new_page; |
1da177e4 LT |
283 | struct ufs_dir_entry *new_de; |
284 | ||
285 | err = -ENOTEMPTY; | |
b71034e5 | 286 | if (dir_de && !ufs_empty_dir(new_inode)) |
1da177e4 | 287 | goto out_dir; |
b71034e5 | 288 | |
1da177e4 | 289 | err = -ENOENT; |
08049707 | 290 | new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page); |
1da177e4 LT |
291 | if (!new_de) |
292 | goto out_dir; | |
b71034e5 | 293 | ufs_set_link(new_dir, new_de, new_page, old_inode); |
1da177e4 LT |
294 | new_inode->i_ctime = CURRENT_TIME_SEC; |
295 | if (dir_de) | |
9a53c3a7 | 296 | drop_nlink(new_inode); |
3257545e | 297 | inode_dec_link_count(new_inode); |
1da177e4 | 298 | } else { |
1da177e4 | 299 | err = ufs_add_link(new_dentry, old_inode); |
37750cdd | 300 | if (err) |
1da177e4 | 301 | goto out_dir; |
1da177e4 | 302 | if (dir_de) |
3257545e | 303 | inode_inc_link_count(new_dir); |
1da177e4 LT |
304 | } |
305 | ||
b71034e5 ED |
306 | /* |
307 | * Like most other Unix systems, set the ctime for inodes on a | |
308 | * rename. | |
b71034e5 ED |
309 | */ |
310 | old_inode->i_ctime = CURRENT_TIME_SEC; | |
1da177e4 | 311 | |
b71034e5 | 312 | ufs_delete_entry(old_dir, old_de, old_page); |
37750cdd | 313 | mark_inode_dirty(old_inode); |
1da177e4 LT |
314 | |
315 | if (dir_de) { | |
b71034e5 | 316 | ufs_set_link(old_inode, dir_de, dir_page, new_dir); |
3257545e | 317 | inode_dec_link_count(old_dir); |
1da177e4 | 318 | } |
1da177e4 LT |
319 | return 0; |
320 | ||
b71034e5 | 321 | |
1da177e4 | 322 | out_dir: |
b71034e5 ED |
323 | if (dir_de) { |
324 | kunmap(dir_page); | |
325 | page_cache_release(dir_page); | |
326 | } | |
1da177e4 | 327 | out_old: |
b71034e5 ED |
328 | kunmap(old_page); |
329 | page_cache_release(old_page); | |
1da177e4 | 330 | out: |
1da177e4 LT |
331 | return err; |
332 | } | |
333 | ||
c5ef1c42 | 334 | const struct inode_operations ufs_dir_inode_operations = { |
1da177e4 LT |
335 | .create = ufs_create, |
336 | .lookup = ufs_lookup, | |
337 | .link = ufs_link, | |
338 | .unlink = ufs_unlink, | |
339 | .symlink = ufs_symlink, | |
340 | .mkdir = ufs_mkdir, | |
341 | .rmdir = ufs_rmdir, | |
342 | .mknod = ufs_mknod, | |
343 | .rename = ufs_rename, | |
344 | }; |