]>
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 | ||
49 | static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd) | |
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, |
1da177e4 LT |
74 | struct nameidata *nd) |
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 | |
788257d6 | 129 | lock_ufs(dir->i_sb); |
1da177e4 LT |
130 | inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO); |
131 | err = PTR_ERR(inode); | |
132 | if (IS_ERR(inode)) | |
133 | goto out; | |
134 | ||
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 | 169 | if (inode->i_nlink >= UFS_LINK_MAX) { |
788257d6 | 170 | unlock_ufs(dir->i_sb); |
1da177e4 LT |
171 | return -EMLINK; |
172 | } | |
173 | ||
174 | inode->i_ctime = CURRENT_TIME_SEC; | |
3257545e | 175 | inode_inc_link_count(inode); |
7de9c6ee | 176 | ihold(inode); |
1da177e4 LT |
177 | |
178 | error = ufs_add_nondir(dentry, inode); | |
788257d6 | 179 | unlock_ufs(dir->i_sb); |
1da177e4 LT |
180 | return error; |
181 | } | |
182 | ||
18bb1db3 | 183 | static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode) |
1da177e4 LT |
184 | { |
185 | struct inode * inode; | |
186 | int err = -EMLINK; | |
187 | ||
188 | if (dir->i_nlink >= UFS_LINK_MAX) | |
189 | goto out; | |
190 | ||
788257d6 | 191 | lock_ufs(dir->i_sb); |
3257545e | 192 | inode_inc_link_count(dir); |
1da177e4 LT |
193 | |
194 | inode = ufs_new_inode(dir, S_IFDIR|mode); | |
195 | err = PTR_ERR(inode); | |
196 | if (IS_ERR(inode)) | |
197 | goto out_dir; | |
198 | ||
199 | inode->i_op = &ufs_dir_inode_operations; | |
200 | inode->i_fop = &ufs_dir_operations; | |
826843a3 | 201 | inode->i_mapping->a_ops = &ufs_aops; |
1da177e4 | 202 | |
3257545e | 203 | inode_inc_link_count(inode); |
1da177e4 LT |
204 | |
205 | err = ufs_make_empty(inode, dir); | |
206 | if (err) | |
207 | goto out_fail; | |
208 | ||
209 | err = ufs_add_link(dentry, inode); | |
210 | if (err) | |
211 | goto out_fail; | |
788257d6 | 212 | unlock_ufs(dir->i_sb); |
1da177e4 LT |
213 | |
214 | d_instantiate(dentry, inode); | |
215 | out: | |
216 | return err; | |
217 | ||
218 | out_fail: | |
3257545e AD |
219 | inode_dec_link_count(inode); |
220 | inode_dec_link_count(inode); | |
1da177e4 LT |
221 | iput (inode); |
222 | out_dir: | |
3257545e | 223 | inode_dec_link_count(dir); |
788257d6 | 224 | unlock_ufs(dir->i_sb); |
1da177e4 LT |
225 | goto out; |
226 | } | |
227 | ||
b71034e5 | 228 | static int ufs_unlink(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
229 | { |
230 | struct inode * inode = dentry->d_inode; | |
b71034e5 ED |
231 | struct ufs_dir_entry *de; |
232 | struct page *page; | |
1da177e4 LT |
233 | int err = -ENOENT; |
234 | ||
08049707 | 235 | de = ufs_find_entry(dir, &dentry->d_name, &page); |
1da177e4 LT |
236 | if (!de) |
237 | goto out; | |
238 | ||
b71034e5 | 239 | err = ufs_delete_entry(dir, de, page); |
1da177e4 LT |
240 | if (err) |
241 | goto out; | |
242 | ||
243 | inode->i_ctime = dir->i_ctime; | |
3257545e | 244 | inode_dec_link_count(inode); |
1da177e4 LT |
245 | err = 0; |
246 | out: | |
1da177e4 LT |
247 | return err; |
248 | } | |
249 | ||
250 | static int ufs_rmdir (struct inode * dir, struct dentry *dentry) | |
251 | { | |
252 | struct inode * inode = dentry->d_inode; | |
253 | int err= -ENOTEMPTY; | |
254 | ||
788257d6 | 255 | lock_ufs(dir->i_sb); |
1da177e4 LT |
256 | if (ufs_empty_dir (inode)) { |
257 | err = ufs_unlink(dir, dentry); | |
258 | if (!err) { | |
259 | inode->i_size = 0; | |
3257545e AD |
260 | inode_dec_link_count(inode); |
261 | inode_dec_link_count(dir); | |
1da177e4 LT |
262 | } |
263 | } | |
788257d6 | 264 | unlock_ufs(dir->i_sb); |
1da177e4 LT |
265 | return err; |
266 | } | |
267 | ||
b71034e5 ED |
268 | static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry, |
269 | struct inode *new_dir, struct dentry *new_dentry) | |
1da177e4 LT |
270 | { |
271 | struct inode *old_inode = old_dentry->d_inode; | |
272 | struct inode *new_inode = new_dentry->d_inode; | |
b71034e5 ED |
273 | struct page *dir_page = NULL; |
274 | struct ufs_dir_entry * dir_de = NULL; | |
275 | struct page *old_page; | |
1da177e4 LT |
276 | struct ufs_dir_entry *old_de; |
277 | int err = -ENOENT; | |
278 | ||
08049707 | 279 | old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page); |
1da177e4 LT |
280 | if (!old_de) |
281 | goto out; | |
282 | ||
283 | if (S_ISDIR(old_inode->i_mode)) { | |
284 | err = -EIO; | |
b71034e5 | 285 | dir_de = ufs_dotdot(old_inode, &dir_page); |
1da177e4 LT |
286 | if (!dir_de) |
287 | goto out_old; | |
288 | } | |
289 | ||
290 | if (new_inode) { | |
b71034e5 | 291 | struct page *new_page; |
1da177e4 LT |
292 | struct ufs_dir_entry *new_de; |
293 | ||
294 | err = -ENOTEMPTY; | |
b71034e5 | 295 | if (dir_de && !ufs_empty_dir(new_inode)) |
1da177e4 | 296 | goto out_dir; |
b71034e5 | 297 | |
1da177e4 | 298 | err = -ENOENT; |
08049707 | 299 | new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page); |
1da177e4 LT |
300 | if (!new_de) |
301 | goto out_dir; | |
b71034e5 | 302 | ufs_set_link(new_dir, new_de, new_page, old_inode); |
1da177e4 LT |
303 | new_inode->i_ctime = CURRENT_TIME_SEC; |
304 | if (dir_de) | |
9a53c3a7 | 305 | drop_nlink(new_inode); |
3257545e | 306 | inode_dec_link_count(new_inode); |
1da177e4 LT |
307 | } else { |
308 | if (dir_de) { | |
309 | err = -EMLINK; | |
310 | if (new_dir->i_nlink >= UFS_LINK_MAX) | |
311 | goto out_dir; | |
312 | } | |
1da177e4 | 313 | err = ufs_add_link(new_dentry, old_inode); |
37750cdd | 314 | if (err) |
1da177e4 | 315 | goto out_dir; |
1da177e4 | 316 | if (dir_de) |
3257545e | 317 | inode_inc_link_count(new_dir); |
1da177e4 LT |
318 | } |
319 | ||
b71034e5 ED |
320 | /* |
321 | * Like most other Unix systems, set the ctime for inodes on a | |
322 | * rename. | |
b71034e5 ED |
323 | */ |
324 | old_inode->i_ctime = CURRENT_TIME_SEC; | |
1da177e4 | 325 | |
b71034e5 | 326 | ufs_delete_entry(old_dir, old_de, old_page); |
37750cdd | 327 | mark_inode_dirty(old_inode); |
1da177e4 LT |
328 | |
329 | if (dir_de) { | |
b71034e5 | 330 | ufs_set_link(old_inode, dir_de, dir_page, new_dir); |
3257545e | 331 | inode_dec_link_count(old_dir); |
1da177e4 | 332 | } |
1da177e4 LT |
333 | return 0; |
334 | ||
b71034e5 | 335 | |
1da177e4 | 336 | out_dir: |
b71034e5 ED |
337 | if (dir_de) { |
338 | kunmap(dir_page); | |
339 | page_cache_release(dir_page); | |
340 | } | |
1da177e4 | 341 | out_old: |
b71034e5 ED |
342 | kunmap(old_page); |
343 | page_cache_release(old_page); | |
1da177e4 | 344 | out: |
1da177e4 LT |
345 | return err; |
346 | } | |
347 | ||
c5ef1c42 | 348 | const struct inode_operations ufs_dir_inode_operations = { |
1da177e4 LT |
349 | .create = ufs_create, |
350 | .lookup = ufs_lookup, | |
351 | .link = ufs_link, | |
352 | .unlink = ufs_unlink, | |
353 | .symlink = ufs_symlink, | |
354 | .mkdir = ufs_mkdir, | |
355 | .rmdir = ufs_rmdir, | |
356 | .mknod = ufs_mknod, | |
357 | .rename = ufs_rename, | |
358 | }; |