Commit | Line | Data |
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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> | |
1da177e4 | 32 | #include <linux/smp_lock.h> |
e5420598 MF |
33 | |
34 | #include "ufs_fs.h" | |
bcd6d4ec | 35 | #include "ufs.h" |
1da177e4 LT |
36 | #include "util.h" |
37 | ||
1da177e4 LT |
38 | static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode) |
39 | { | |
40 | int err = ufs_add_link(dentry, inode); | |
41 | if (!err) { | |
42 | d_instantiate(dentry, inode); | |
43 | return 0; | |
44 | } | |
3257545e | 45 | inode_dec_link_count(inode); |
1da177e4 LT |
46 | iput(inode); |
47 | return err; | |
48 | } | |
49 | ||
50 | static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd) | |
51 | { | |
52 | struct inode * inode = NULL; | |
53 | ino_t ino; | |
54 | ||
55 | if (dentry->d_name.len > UFS_MAXNAMLEN) | |
56 | return ERR_PTR(-ENAMETOOLONG); | |
57 | ||
58 | lock_kernel(); | |
08049707 | 59 | ino = ufs_inode_by_name(dir, &dentry->d_name); |
1da177e4 | 60 | if (ino) { |
b55c460d DH |
61 | inode = ufs_iget(dir->i_sb, ino); |
62 | if (IS_ERR(inode)) { | |
1da177e4 | 63 | unlock_kernel(); |
b55c460d | 64 | return ERR_CAST(inode); |
1da177e4 LT |
65 | } |
66 | } | |
67 | unlock_kernel(); | |
68 | d_add(dentry, inode); | |
69 | return NULL; | |
70 | } | |
71 | ||
72 | /* | |
73 | * By the time this is called, we already have created | |
74 | * the directory cache entry for the new file, but it | |
75 | * is so far negative - it has no inode. | |
76 | * | |
77 | * If the create succeeds, we fill in the inode information | |
78 | * with d_instantiate(). | |
79 | */ | |
80 | static int ufs_create (struct inode * dir, struct dentry * dentry, int mode, | |
81 | struct nameidata *nd) | |
82 | { | |
abf5d15f ED |
83 | struct inode *inode; |
84 | int err; | |
85 | ||
86 | UFSD("BEGIN\n"); | |
907f4554 | 87 | |
abf5d15f ED |
88 | inode = ufs_new_inode(dir, mode); |
89 | err = PTR_ERR(inode); | |
90 | ||
1da177e4 LT |
91 | if (!IS_ERR(inode)) { |
92 | inode->i_op = &ufs_file_inode_operations; | |
93 | inode->i_fop = &ufs_file_operations; | |
94 | inode->i_mapping->a_ops = &ufs_aops; | |
95 | mark_inode_dirty(inode); | |
96 | lock_kernel(); | |
97 | err = ufs_add_nondir(dentry, inode); | |
98 | unlock_kernel(); | |
99 | } | |
abf5d15f | 100 | UFSD("END: err=%d\n", err); |
1da177e4 LT |
101 | return err; |
102 | } | |
103 | ||
104 | static int ufs_mknod (struct inode * dir, struct dentry *dentry, int mode, dev_t rdev) | |
105 | { | |
106 | struct inode *inode; | |
107 | int err; | |
108 | ||
109 | if (!old_valid_dev(rdev)) | |
110 | return -EINVAL; | |
907f4554 | 111 | |
1da177e4 LT |
112 | inode = ufs_new_inode(dir, mode); |
113 | err = PTR_ERR(inode); | |
114 | if (!IS_ERR(inode)) { | |
115 | init_special_inode(inode, mode, rdev); | |
1da177e4 LT |
116 | ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev); |
117 | mark_inode_dirty(inode); | |
118 | lock_kernel(); | |
119 | err = ufs_add_nondir(dentry, inode); | |
120 | unlock_kernel(); | |
121 | } | |
122 | return err; | |
123 | } | |
124 | ||
125 | static int ufs_symlink (struct inode * dir, struct dentry * dentry, | |
126 | const char * symname) | |
127 | { | |
128 | struct super_block * sb = dir->i_sb; | |
129 | int err = -ENAMETOOLONG; | |
130 | unsigned l = strlen(symname)+1; | |
131 | struct inode * inode; | |
132 | ||
133 | if (l > sb->s_blocksize) | |
344fe786 | 134 | goto out_notlocked; |
1da177e4 LT |
135 | |
136 | lock_kernel(); | |
137 | inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO); | |
138 | err = PTR_ERR(inode); | |
139 | if (IS_ERR(inode)) | |
140 | goto out; | |
141 | ||
142 | if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) { | |
143 | /* slow symlink */ | |
311b9549 | 144 | inode->i_op = &ufs_symlink_inode_operations; |
1da177e4 LT |
145 | inode->i_mapping->a_ops = &ufs_aops; |
146 | err = page_symlink(inode, symname, l); | |
147 | if (err) | |
148 | goto out_fail; | |
149 | } else { | |
150 | /* fast symlink */ | |
151 | inode->i_op = &ufs_fast_symlink_inode_operations; | |
723be1f3 | 152 | memcpy(UFS_I(inode)->i_u1.i_symlink, symname, l); |
1da177e4 LT |
153 | inode->i_size = l-1; |
154 | } | |
155 | mark_inode_dirty(inode); | |
156 | ||
157 | err = ufs_add_nondir(dentry, inode); | |
158 | out: | |
159 | unlock_kernel(); | |
344fe786 | 160 | out_notlocked: |
1da177e4 LT |
161 | return err; |
162 | ||
163 | out_fail: | |
3257545e | 164 | inode_dec_link_count(inode); |
1da177e4 LT |
165 | iput(inode); |
166 | goto out; | |
167 | } | |
168 | ||
169 | static int ufs_link (struct dentry * old_dentry, struct inode * dir, | |
170 | struct dentry *dentry) | |
171 | { | |
172 | struct inode *inode = old_dentry->d_inode; | |
173 | int error; | |
174 | ||
175 | lock_kernel(); | |
176 | if (inode->i_nlink >= UFS_LINK_MAX) { | |
177 | unlock_kernel(); | |
178 | return -EMLINK; | |
179 | } | |
180 | ||
181 | inode->i_ctime = CURRENT_TIME_SEC; | |
3257545e | 182 | inode_inc_link_count(inode); |
7de9c6ee | 183 | ihold(inode); |
1da177e4 LT |
184 | |
185 | error = ufs_add_nondir(dentry, inode); | |
186 | unlock_kernel(); | |
187 | return error; | |
188 | } | |
189 | ||
190 | static int ufs_mkdir(struct inode * dir, struct dentry * dentry, int mode) | |
191 | { | |
192 | struct inode * inode; | |
193 | int err = -EMLINK; | |
194 | ||
195 | if (dir->i_nlink >= UFS_LINK_MAX) | |
196 | goto out; | |
197 | ||
198 | lock_kernel(); | |
3257545e | 199 | inode_inc_link_count(dir); |
1da177e4 LT |
200 | |
201 | inode = ufs_new_inode(dir, S_IFDIR|mode); | |
202 | err = PTR_ERR(inode); | |
203 | if (IS_ERR(inode)) | |
204 | goto out_dir; | |
205 | ||
206 | inode->i_op = &ufs_dir_inode_operations; | |
207 | inode->i_fop = &ufs_dir_operations; | |
826843a3 | 208 | inode->i_mapping->a_ops = &ufs_aops; |
1da177e4 | 209 | |
3257545e | 210 | inode_inc_link_count(inode); |
1da177e4 LT |
211 | |
212 | err = ufs_make_empty(inode, dir); | |
213 | if (err) | |
214 | goto out_fail; | |
215 | ||
216 | err = ufs_add_link(dentry, inode); | |
217 | if (err) | |
218 | goto out_fail; | |
219 | unlock_kernel(); | |
220 | ||
221 | d_instantiate(dentry, inode); | |
222 | out: | |
223 | return err; | |
224 | ||
225 | out_fail: | |
3257545e AD |
226 | inode_dec_link_count(inode); |
227 | inode_dec_link_count(inode); | |
1da177e4 LT |
228 | iput (inode); |
229 | out_dir: | |
3257545e | 230 | inode_dec_link_count(dir); |
1da177e4 LT |
231 | unlock_kernel(); |
232 | goto out; | |
233 | } | |
234 | ||
b71034e5 | 235 | static int ufs_unlink(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
236 | { |
237 | struct inode * inode = dentry->d_inode; | |
b71034e5 ED |
238 | struct ufs_dir_entry *de; |
239 | struct page *page; | |
1da177e4 LT |
240 | int err = -ENOENT; |
241 | ||
08049707 | 242 | de = ufs_find_entry(dir, &dentry->d_name, &page); |
1da177e4 LT |
243 | if (!de) |
244 | goto out; | |
245 | ||
b71034e5 | 246 | err = ufs_delete_entry(dir, de, page); |
1da177e4 LT |
247 | if (err) |
248 | goto out; | |
249 | ||
250 | inode->i_ctime = dir->i_ctime; | |
3257545e | 251 | inode_dec_link_count(inode); |
1da177e4 LT |
252 | err = 0; |
253 | out: | |
1da177e4 LT |
254 | return err; |
255 | } | |
256 | ||
257 | static int ufs_rmdir (struct inode * dir, struct dentry *dentry) | |
258 | { | |
259 | struct inode * inode = dentry->d_inode; | |
260 | int err= -ENOTEMPTY; | |
261 | ||
262 | lock_kernel(); | |
263 | if (ufs_empty_dir (inode)) { | |
264 | err = ufs_unlink(dir, dentry); | |
265 | if (!err) { | |
266 | inode->i_size = 0; | |
3257545e AD |
267 | inode_dec_link_count(inode); |
268 | inode_dec_link_count(dir); | |
1da177e4 LT |
269 | } |
270 | } | |
271 | unlock_kernel(); | |
272 | return err; | |
273 | } | |
274 | ||
b71034e5 ED |
275 | static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry, |
276 | struct inode *new_dir, struct dentry *new_dentry) | |
1da177e4 LT |
277 | { |
278 | struct inode *old_inode = old_dentry->d_inode; | |
279 | struct inode *new_inode = new_dentry->d_inode; | |
b71034e5 ED |
280 | struct page *dir_page = NULL; |
281 | struct ufs_dir_entry * dir_de = NULL; | |
282 | struct page *old_page; | |
1da177e4 LT |
283 | struct ufs_dir_entry *old_de; |
284 | int err = -ENOENT; | |
285 | ||
08049707 | 286 | old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page); |
1da177e4 LT |
287 | if (!old_de) |
288 | goto out; | |
289 | ||
290 | if (S_ISDIR(old_inode->i_mode)) { | |
291 | err = -EIO; | |
b71034e5 | 292 | dir_de = ufs_dotdot(old_inode, &dir_page); |
1da177e4 LT |
293 | if (!dir_de) |
294 | goto out_old; | |
295 | } | |
296 | ||
297 | if (new_inode) { | |
b71034e5 | 298 | struct page *new_page; |
1da177e4 LT |
299 | struct ufs_dir_entry *new_de; |
300 | ||
301 | err = -ENOTEMPTY; | |
b71034e5 | 302 | if (dir_de && !ufs_empty_dir(new_inode)) |
1da177e4 | 303 | goto out_dir; |
b71034e5 | 304 | |
1da177e4 | 305 | err = -ENOENT; |
08049707 | 306 | new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page); |
1da177e4 LT |
307 | if (!new_de) |
308 | goto out_dir; | |
3257545e | 309 | inode_inc_link_count(old_inode); |
b71034e5 | 310 | ufs_set_link(new_dir, new_de, new_page, old_inode); |
1da177e4 LT |
311 | new_inode->i_ctime = CURRENT_TIME_SEC; |
312 | if (dir_de) | |
9a53c3a7 | 313 | drop_nlink(new_inode); |
3257545e | 314 | inode_dec_link_count(new_inode); |
1da177e4 LT |
315 | } else { |
316 | if (dir_de) { | |
317 | err = -EMLINK; | |
318 | if (new_dir->i_nlink >= UFS_LINK_MAX) | |
319 | goto out_dir; | |
320 | } | |
3257545e | 321 | inode_inc_link_count(old_inode); |
1da177e4 LT |
322 | err = ufs_add_link(new_dentry, old_inode); |
323 | if (err) { | |
3257545e | 324 | inode_dec_link_count(old_inode); |
1da177e4 LT |
325 | goto out_dir; |
326 | } | |
327 | if (dir_de) | |
3257545e | 328 | inode_inc_link_count(new_dir); |
1da177e4 LT |
329 | } |
330 | ||
b71034e5 ED |
331 | /* |
332 | * Like most other Unix systems, set the ctime for inodes on a | |
333 | * rename. | |
334 | * inode_dec_link_count() will mark the inode dirty. | |
335 | */ | |
336 | old_inode->i_ctime = CURRENT_TIME_SEC; | |
1da177e4 | 337 | |
b71034e5 | 338 | ufs_delete_entry(old_dir, old_de, old_page); |
3257545e | 339 | inode_dec_link_count(old_inode); |
1da177e4 LT |
340 | |
341 | if (dir_de) { | |
b71034e5 | 342 | ufs_set_link(old_inode, dir_de, dir_page, new_dir); |
3257545e | 343 | inode_dec_link_count(old_dir); |
1da177e4 | 344 | } |
1da177e4 LT |
345 | return 0; |
346 | ||
b71034e5 | 347 | |
1da177e4 | 348 | out_dir: |
b71034e5 ED |
349 | if (dir_de) { |
350 | kunmap(dir_page); | |
351 | page_cache_release(dir_page); | |
352 | } | |
1da177e4 | 353 | out_old: |
b71034e5 ED |
354 | kunmap(old_page); |
355 | page_cache_release(old_page); | |
1da177e4 | 356 | out: |
1da177e4 LT |
357 | return err; |
358 | } | |
359 | ||
c5ef1c42 | 360 | const struct inode_operations ufs_dir_inode_operations = { |
1da177e4 LT |
361 | .create = ufs_create, |
362 | .lookup = ufs_lookup, | |
363 | .link = ufs_link, | |
364 | .unlink = ufs_unlink, | |
365 | .symlink = ufs_symlink, | |
366 | .mkdir = ufs_mkdir, | |
367 | .rmdir = ufs_rmdir, | |
368 | .mknod = ufs_mknod, | |
369 | .rename = ufs_rename, | |
370 | }; |