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); |
1da177e4 | 59 | if (ino) { |
b55c460d DH |
60 | inode = ufs_iget(dir->i_sb, ino); |
61 | if (IS_ERR(inode)) { | |
788257d6 | 62 | unlock_ufs(dir->i_sb); |
b55c460d | 63 | return ERR_CAST(inode); |
1da177e4 LT |
64 | } |
65 | } | |
788257d6 | 66 | unlock_ufs(dir->i_sb); |
1da177e4 LT |
67 | d_add(dentry, inode); |
68 | return NULL; | |
69 | } | |
70 | ||
71 | /* | |
72 | * By the time this is called, we already have created | |
73 | * the directory cache entry for the new file, but it | |
74 | * is so far negative - it has no inode. | |
75 | * | |
76 | * If the create succeeds, we fill in the inode information | |
77 | * with d_instantiate(). | |
78 | */ | |
79 | static int ufs_create (struct inode * dir, struct dentry * dentry, int mode, | |
80 | struct nameidata *nd) | |
81 | { | |
abf5d15f ED |
82 | struct inode *inode; |
83 | int err; | |
84 | ||
85 | UFSD("BEGIN\n"); | |
907f4554 | 86 | |
abf5d15f ED |
87 | inode = ufs_new_inode(dir, mode); |
88 | err = PTR_ERR(inode); | |
89 | ||
1da177e4 LT |
90 | if (!IS_ERR(inode)) { |
91 | inode->i_op = &ufs_file_inode_operations; | |
92 | inode->i_fop = &ufs_file_operations; | |
93 | inode->i_mapping->a_ops = &ufs_aops; | |
94 | mark_inode_dirty(inode); | |
788257d6 | 95 | lock_ufs(dir->i_sb); |
1da177e4 | 96 | err = ufs_add_nondir(dentry, inode); |
788257d6 | 97 | unlock_ufs(dir->i_sb); |
1da177e4 | 98 | } |
abf5d15f | 99 | UFSD("END: err=%d\n", err); |
1da177e4 LT |
100 | return err; |
101 | } | |
102 | ||
103 | static int ufs_mknod (struct inode * dir, struct dentry *dentry, int mode, dev_t rdev) | |
104 | { | |
105 | struct inode *inode; | |
106 | int err; | |
107 | ||
108 | if (!old_valid_dev(rdev)) | |
109 | return -EINVAL; | |
907f4554 | 110 | |
1da177e4 LT |
111 | inode = ufs_new_inode(dir, mode); |
112 | err = PTR_ERR(inode); | |
113 | if (!IS_ERR(inode)) { | |
114 | init_special_inode(inode, mode, rdev); | |
1da177e4 LT |
115 | ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev); |
116 | mark_inode_dirty(inode); | |
788257d6 | 117 | lock_ufs(dir->i_sb); |
1da177e4 | 118 | err = ufs_add_nondir(dentry, inode); |
788257d6 | 119 | unlock_ufs(dir->i_sb); |
1da177e4 LT |
120 | } |
121 | return err; | |
122 | } | |
123 | ||
124 | static int ufs_symlink (struct inode * dir, struct dentry * dentry, | |
125 | const char * symname) | |
126 | { | |
127 | struct super_block * sb = dir->i_sb; | |
128 | int err = -ENAMETOOLONG; | |
129 | unsigned l = strlen(symname)+1; | |
130 | struct inode * inode; | |
131 | ||
132 | if (l > sb->s_blocksize) | |
344fe786 | 133 | goto out_notlocked; |
1da177e4 | 134 | |
788257d6 | 135 | lock_ufs(dir->i_sb); |
1da177e4 LT |
136 | inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO); |
137 | err = PTR_ERR(inode); | |
138 | if (IS_ERR(inode)) | |
139 | goto out; | |
140 | ||
141 | if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) { | |
142 | /* slow symlink */ | |
311b9549 | 143 | inode->i_op = &ufs_symlink_inode_operations; |
1da177e4 LT |
144 | inode->i_mapping->a_ops = &ufs_aops; |
145 | err = page_symlink(inode, symname, l); | |
146 | if (err) | |
147 | goto out_fail; | |
148 | } else { | |
149 | /* fast symlink */ | |
150 | inode->i_op = &ufs_fast_symlink_inode_operations; | |
723be1f3 | 151 | memcpy(UFS_I(inode)->i_u1.i_symlink, symname, l); |
1da177e4 LT |
152 | inode->i_size = l-1; |
153 | } | |
154 | mark_inode_dirty(inode); | |
155 | ||
156 | err = ufs_add_nondir(dentry, inode); | |
157 | out: | |
788257d6 | 158 | unlock_ufs(dir->i_sb); |
344fe786 | 159 | out_notlocked: |
1da177e4 LT |
160 | return err; |
161 | ||
162 | out_fail: | |
3257545e | 163 | inode_dec_link_count(inode); |
1da177e4 LT |
164 | iput(inode); |
165 | goto out; | |
166 | } | |
167 | ||
168 | static int ufs_link (struct dentry * old_dentry, struct inode * dir, | |
169 | struct dentry *dentry) | |
170 | { | |
171 | struct inode *inode = old_dentry->d_inode; | |
172 | int error; | |
173 | ||
788257d6 | 174 | lock_ufs(dir->i_sb); |
1da177e4 | 175 | if (inode->i_nlink >= UFS_LINK_MAX) { |
788257d6 | 176 | unlock_ufs(dir->i_sb); |
1da177e4 LT |
177 | return -EMLINK; |
178 | } | |
179 | ||
180 | inode->i_ctime = CURRENT_TIME_SEC; | |
3257545e | 181 | inode_inc_link_count(inode); |
7de9c6ee | 182 | ihold(inode); |
1da177e4 LT |
183 | |
184 | error = ufs_add_nondir(dentry, inode); | |
788257d6 | 185 | unlock_ufs(dir->i_sb); |
1da177e4 LT |
186 | return error; |
187 | } | |
188 | ||
189 | static int ufs_mkdir(struct inode * dir, struct dentry * dentry, int mode) | |
190 | { | |
191 | struct inode * inode; | |
192 | int err = -EMLINK; | |
193 | ||
194 | if (dir->i_nlink >= UFS_LINK_MAX) | |
195 | goto out; | |
196 | ||
788257d6 | 197 | lock_ufs(dir->i_sb); |
3257545e | 198 | inode_inc_link_count(dir); |
1da177e4 LT |
199 | |
200 | inode = ufs_new_inode(dir, S_IFDIR|mode); | |
201 | err = PTR_ERR(inode); | |
202 | if (IS_ERR(inode)) | |
203 | goto out_dir; | |
204 | ||
205 | inode->i_op = &ufs_dir_inode_operations; | |
206 | inode->i_fop = &ufs_dir_operations; | |
826843a3 | 207 | inode->i_mapping->a_ops = &ufs_aops; |
1da177e4 | 208 | |
3257545e | 209 | inode_inc_link_count(inode); |
1da177e4 LT |
210 | |
211 | err = ufs_make_empty(inode, dir); | |
212 | if (err) | |
213 | goto out_fail; | |
214 | ||
215 | err = ufs_add_link(dentry, inode); | |
216 | if (err) | |
217 | goto out_fail; | |
788257d6 | 218 | unlock_ufs(dir->i_sb); |
1da177e4 LT |
219 | |
220 | d_instantiate(dentry, inode); | |
221 | out: | |
222 | return err; | |
223 | ||
224 | out_fail: | |
3257545e AD |
225 | inode_dec_link_count(inode); |
226 | inode_dec_link_count(inode); | |
1da177e4 LT |
227 | iput (inode); |
228 | out_dir: | |
3257545e | 229 | inode_dec_link_count(dir); |
788257d6 | 230 | unlock_ufs(dir->i_sb); |
1da177e4 LT |
231 | goto out; |
232 | } | |
233 | ||
b71034e5 | 234 | static int ufs_unlink(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
235 | { |
236 | struct inode * inode = dentry->d_inode; | |
b71034e5 ED |
237 | struct ufs_dir_entry *de; |
238 | struct page *page; | |
1da177e4 LT |
239 | int err = -ENOENT; |
240 | ||
08049707 | 241 | de = ufs_find_entry(dir, &dentry->d_name, &page); |
1da177e4 LT |
242 | if (!de) |
243 | goto out; | |
244 | ||
b71034e5 | 245 | err = ufs_delete_entry(dir, de, page); |
1da177e4 LT |
246 | if (err) |
247 | goto out; | |
248 | ||
249 | inode->i_ctime = dir->i_ctime; | |
3257545e | 250 | inode_dec_link_count(inode); |
1da177e4 LT |
251 | err = 0; |
252 | out: | |
1da177e4 LT |
253 | return err; |
254 | } | |
255 | ||
256 | static int ufs_rmdir (struct inode * dir, struct dentry *dentry) | |
257 | { | |
258 | struct inode * inode = dentry->d_inode; | |
259 | int err= -ENOTEMPTY; | |
260 | ||
788257d6 | 261 | lock_ufs(dir->i_sb); |
1da177e4 LT |
262 | if (ufs_empty_dir (inode)) { |
263 | err = ufs_unlink(dir, dentry); | |
264 | if (!err) { | |
265 | inode->i_size = 0; | |
3257545e AD |
266 | inode_dec_link_count(inode); |
267 | inode_dec_link_count(dir); | |
1da177e4 LT |
268 | } |
269 | } | |
788257d6 | 270 | unlock_ufs(dir->i_sb); |
1da177e4 LT |
271 | return err; |
272 | } | |
273 | ||
b71034e5 ED |
274 | static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry, |
275 | struct inode *new_dir, struct dentry *new_dentry) | |
1da177e4 LT |
276 | { |
277 | struct inode *old_inode = old_dentry->d_inode; | |
278 | struct inode *new_inode = new_dentry->d_inode; | |
b71034e5 ED |
279 | struct page *dir_page = NULL; |
280 | struct ufs_dir_entry * dir_de = NULL; | |
281 | struct page *old_page; | |
1da177e4 LT |
282 | struct ufs_dir_entry *old_de; |
283 | int err = -ENOENT; | |
284 | ||
08049707 | 285 | old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page); |
1da177e4 LT |
286 | if (!old_de) |
287 | goto out; | |
288 | ||
289 | if (S_ISDIR(old_inode->i_mode)) { | |
290 | err = -EIO; | |
b71034e5 | 291 | dir_de = ufs_dotdot(old_inode, &dir_page); |
1da177e4 LT |
292 | if (!dir_de) |
293 | goto out_old; | |
294 | } | |
295 | ||
296 | if (new_inode) { | |
b71034e5 | 297 | struct page *new_page; |
1da177e4 LT |
298 | struct ufs_dir_entry *new_de; |
299 | ||
300 | err = -ENOTEMPTY; | |
b71034e5 | 301 | if (dir_de && !ufs_empty_dir(new_inode)) |
1da177e4 | 302 | goto out_dir; |
b71034e5 | 303 | |
1da177e4 | 304 | err = -ENOENT; |
08049707 | 305 | new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page); |
1da177e4 LT |
306 | if (!new_de) |
307 | goto out_dir; | |
b71034e5 | 308 | ufs_set_link(new_dir, new_de, new_page, old_inode); |
1da177e4 LT |
309 | new_inode->i_ctime = CURRENT_TIME_SEC; |
310 | if (dir_de) | |
9a53c3a7 | 311 | drop_nlink(new_inode); |
3257545e | 312 | inode_dec_link_count(new_inode); |
1da177e4 LT |
313 | } else { |
314 | if (dir_de) { | |
315 | err = -EMLINK; | |
316 | if (new_dir->i_nlink >= UFS_LINK_MAX) | |
317 | goto out_dir; | |
318 | } | |
1da177e4 | 319 | err = ufs_add_link(new_dentry, old_inode); |
37750cdd | 320 | if (err) |
1da177e4 | 321 | goto out_dir; |
1da177e4 | 322 | if (dir_de) |
3257545e | 323 | inode_inc_link_count(new_dir); |
1da177e4 LT |
324 | } |
325 | ||
b71034e5 ED |
326 | /* |
327 | * Like most other Unix systems, set the ctime for inodes on a | |
328 | * rename. | |
b71034e5 ED |
329 | */ |
330 | old_inode->i_ctime = CURRENT_TIME_SEC; | |
1da177e4 | 331 | |
b71034e5 | 332 | ufs_delete_entry(old_dir, old_de, old_page); |
37750cdd | 333 | mark_inode_dirty(old_inode); |
1da177e4 LT |
334 | |
335 | if (dir_de) { | |
b71034e5 | 336 | ufs_set_link(old_inode, dir_de, dir_page, new_dir); |
3257545e | 337 | inode_dec_link_count(old_dir); |
1da177e4 | 338 | } |
1da177e4 LT |
339 | return 0; |
340 | ||
b71034e5 | 341 | |
1da177e4 | 342 | out_dir: |
b71034e5 ED |
343 | if (dir_de) { |
344 | kunmap(dir_page); | |
345 | page_cache_release(dir_page); | |
346 | } | |
1da177e4 | 347 | out_old: |
b71034e5 ED |
348 | kunmap(old_page); |
349 | page_cache_release(old_page); | |
1da177e4 | 350 | out: |
1da177e4 LT |
351 | return err; |
352 | } | |
353 | ||
c5ef1c42 | 354 | const struct inode_operations ufs_dir_inode_operations = { |
1da177e4 LT |
355 | .create = ufs_create, |
356 | .lookup = ufs_lookup, | |
357 | .link = ufs_link, | |
358 | .unlink = ufs_unlink, | |
359 | .symlink = ufs_symlink, | |
360 | .mkdir = ufs_mkdir, | |
361 | .rmdir = ufs_rmdir, | |
362 | .mknod = ufs_mknod, | |
363 | .rename = ufs_rename, | |
364 | }; |