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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> |
907f4554 | 33 | #include <linux/quotaops.h> |
e5420598 MF |
34 | |
35 | #include "ufs_fs.h" | |
bcd6d4ec | 36 | #include "ufs.h" |
1da177e4 LT |
37 | #include "util.h" |
38 | ||
1da177e4 LT |
39 | static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode) |
40 | { | |
41 | int err = ufs_add_link(dentry, inode); | |
42 | if (!err) { | |
43 | d_instantiate(dentry, inode); | |
44 | return 0; | |
45 | } | |
3257545e | 46 | inode_dec_link_count(inode); |
1da177e4 LT |
47 | iput(inode); |
48 | return err; | |
49 | } | |
50 | ||
51 | static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd) | |
52 | { | |
53 | struct inode * inode = NULL; | |
54 | ino_t ino; | |
55 | ||
56 | if (dentry->d_name.len > UFS_MAXNAMLEN) | |
57 | return ERR_PTR(-ENAMETOOLONG); | |
58 | ||
59 | lock_kernel(); | |
08049707 | 60 | ino = ufs_inode_by_name(dir, &dentry->d_name); |
1da177e4 | 61 | if (ino) { |
b55c460d DH |
62 | inode = ufs_iget(dir->i_sb, ino); |
63 | if (IS_ERR(inode)) { | |
1da177e4 | 64 | unlock_kernel(); |
b55c460d | 65 | return ERR_CAST(inode); |
1da177e4 LT |
66 | } |
67 | } | |
68 | unlock_kernel(); | |
69 | d_add(dentry, inode); | |
70 | return NULL; | |
71 | } | |
72 | ||
73 | /* | |
74 | * By the time this is called, we already have created | |
75 | * the directory cache entry for the new file, but it | |
76 | * is so far negative - it has no inode. | |
77 | * | |
78 | * If the create succeeds, we fill in the inode information | |
79 | * with d_instantiate(). | |
80 | */ | |
81 | static int ufs_create (struct inode * dir, struct dentry * dentry, int mode, | |
82 | struct nameidata *nd) | |
83 | { | |
abf5d15f ED |
84 | struct inode *inode; |
85 | int err; | |
86 | ||
87 | UFSD("BEGIN\n"); | |
907f4554 | 88 | |
871a2931 | 89 | dquot_initialize(dir); |
907f4554 | 90 | |
abf5d15f ED |
91 | inode = ufs_new_inode(dir, mode); |
92 | err = PTR_ERR(inode); | |
93 | ||
1da177e4 LT |
94 | if (!IS_ERR(inode)) { |
95 | inode->i_op = &ufs_file_inode_operations; | |
96 | inode->i_fop = &ufs_file_operations; | |
97 | inode->i_mapping->a_ops = &ufs_aops; | |
98 | mark_inode_dirty(inode); | |
99 | lock_kernel(); | |
100 | err = ufs_add_nondir(dentry, inode); | |
101 | unlock_kernel(); | |
102 | } | |
abf5d15f | 103 | UFSD("END: err=%d\n", err); |
1da177e4 LT |
104 | return err; |
105 | } | |
106 | ||
107 | static int ufs_mknod (struct inode * dir, struct dentry *dentry, int mode, dev_t rdev) | |
108 | { | |
109 | struct inode *inode; | |
110 | int err; | |
111 | ||
112 | if (!old_valid_dev(rdev)) | |
113 | return -EINVAL; | |
907f4554 | 114 | |
871a2931 | 115 | dquot_initialize(dir); |
907f4554 | 116 | |
1da177e4 LT |
117 | inode = ufs_new_inode(dir, mode); |
118 | err = PTR_ERR(inode); | |
119 | if (!IS_ERR(inode)) { | |
120 | init_special_inode(inode, mode, rdev); | |
1da177e4 LT |
121 | ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev); |
122 | mark_inode_dirty(inode); | |
123 | lock_kernel(); | |
124 | err = ufs_add_nondir(dentry, inode); | |
125 | unlock_kernel(); | |
126 | } | |
127 | return err; | |
128 | } | |
129 | ||
130 | static int ufs_symlink (struct inode * dir, struct dentry * dentry, | |
131 | const char * symname) | |
132 | { | |
133 | struct super_block * sb = dir->i_sb; | |
134 | int err = -ENAMETOOLONG; | |
135 | unsigned l = strlen(symname)+1; | |
136 | struct inode * inode; | |
137 | ||
138 | if (l > sb->s_blocksize) | |
344fe786 | 139 | goto out_notlocked; |
1da177e4 | 140 | |
871a2931 | 141 | dquot_initialize(dir); |
907f4554 | 142 | |
1da177e4 LT |
143 | lock_kernel(); |
144 | inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO); | |
145 | err = PTR_ERR(inode); | |
146 | if (IS_ERR(inode)) | |
147 | goto out; | |
148 | ||
149 | if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) { | |
150 | /* slow symlink */ | |
151 | inode->i_op = &page_symlink_inode_operations; | |
152 | inode->i_mapping->a_ops = &ufs_aops; | |
153 | err = page_symlink(inode, symname, l); | |
154 | if (err) | |
155 | goto out_fail; | |
156 | } else { | |
157 | /* fast symlink */ | |
158 | inode->i_op = &ufs_fast_symlink_inode_operations; | |
723be1f3 | 159 | memcpy(UFS_I(inode)->i_u1.i_symlink, symname, l); |
1da177e4 LT |
160 | inode->i_size = l-1; |
161 | } | |
162 | mark_inode_dirty(inode); | |
163 | ||
164 | err = ufs_add_nondir(dentry, inode); | |
165 | out: | |
166 | unlock_kernel(); | |
344fe786 | 167 | out_notlocked: |
1da177e4 LT |
168 | return err; |
169 | ||
170 | out_fail: | |
3257545e | 171 | inode_dec_link_count(inode); |
1da177e4 LT |
172 | iput(inode); |
173 | goto out; | |
174 | } | |
175 | ||
176 | static int ufs_link (struct dentry * old_dentry, struct inode * dir, | |
177 | struct dentry *dentry) | |
178 | { | |
179 | struct inode *inode = old_dentry->d_inode; | |
180 | int error; | |
181 | ||
182 | lock_kernel(); | |
183 | if (inode->i_nlink >= UFS_LINK_MAX) { | |
184 | unlock_kernel(); | |
185 | return -EMLINK; | |
186 | } | |
187 | ||
871a2931 | 188 | dquot_initialize(dir); |
907f4554 | 189 | |
1da177e4 | 190 | inode->i_ctime = CURRENT_TIME_SEC; |
3257545e | 191 | inode_inc_link_count(inode); |
1da177e4 LT |
192 | atomic_inc(&inode->i_count); |
193 | ||
194 | error = ufs_add_nondir(dentry, inode); | |
195 | unlock_kernel(); | |
196 | return error; | |
197 | } | |
198 | ||
199 | static int ufs_mkdir(struct inode * dir, struct dentry * dentry, int mode) | |
200 | { | |
201 | struct inode * inode; | |
202 | int err = -EMLINK; | |
203 | ||
204 | if (dir->i_nlink >= UFS_LINK_MAX) | |
205 | goto out; | |
206 | ||
871a2931 | 207 | dquot_initialize(dir); |
907f4554 | 208 | |
1da177e4 | 209 | lock_kernel(); |
3257545e | 210 | inode_inc_link_count(dir); |
1da177e4 LT |
211 | |
212 | inode = ufs_new_inode(dir, S_IFDIR|mode); | |
213 | err = PTR_ERR(inode); | |
214 | if (IS_ERR(inode)) | |
215 | goto out_dir; | |
216 | ||
217 | inode->i_op = &ufs_dir_inode_operations; | |
218 | inode->i_fop = &ufs_dir_operations; | |
826843a3 | 219 | inode->i_mapping->a_ops = &ufs_aops; |
1da177e4 | 220 | |
3257545e | 221 | inode_inc_link_count(inode); |
1da177e4 LT |
222 | |
223 | err = ufs_make_empty(inode, dir); | |
224 | if (err) | |
225 | goto out_fail; | |
226 | ||
227 | err = ufs_add_link(dentry, inode); | |
228 | if (err) | |
229 | goto out_fail; | |
230 | unlock_kernel(); | |
231 | ||
232 | d_instantiate(dentry, inode); | |
233 | out: | |
234 | return err; | |
235 | ||
236 | out_fail: | |
3257545e AD |
237 | inode_dec_link_count(inode); |
238 | inode_dec_link_count(inode); | |
1da177e4 LT |
239 | iput (inode); |
240 | out_dir: | |
3257545e | 241 | inode_dec_link_count(dir); |
1da177e4 LT |
242 | unlock_kernel(); |
243 | goto out; | |
244 | } | |
245 | ||
b71034e5 | 246 | static int ufs_unlink(struct inode *dir, struct dentry *dentry) |
1da177e4 LT |
247 | { |
248 | struct inode * inode = dentry->d_inode; | |
b71034e5 ED |
249 | struct ufs_dir_entry *de; |
250 | struct page *page; | |
1da177e4 LT |
251 | int err = -ENOENT; |
252 | ||
871a2931 | 253 | dquot_initialize(dir); |
907f4554 | 254 | |
08049707 | 255 | de = ufs_find_entry(dir, &dentry->d_name, &page); |
1da177e4 LT |
256 | if (!de) |
257 | goto out; | |
258 | ||
b71034e5 | 259 | err = ufs_delete_entry(dir, de, page); |
1da177e4 LT |
260 | if (err) |
261 | goto out; | |
262 | ||
263 | inode->i_ctime = dir->i_ctime; | |
3257545e | 264 | inode_dec_link_count(inode); |
1da177e4 LT |
265 | err = 0; |
266 | out: | |
1da177e4 LT |
267 | return err; |
268 | } | |
269 | ||
270 | static int ufs_rmdir (struct inode * dir, struct dentry *dentry) | |
271 | { | |
272 | struct inode * inode = dentry->d_inode; | |
273 | int err= -ENOTEMPTY; | |
274 | ||
275 | lock_kernel(); | |
276 | if (ufs_empty_dir (inode)) { | |
277 | err = ufs_unlink(dir, dentry); | |
278 | if (!err) { | |
279 | inode->i_size = 0; | |
3257545e AD |
280 | inode_dec_link_count(inode); |
281 | inode_dec_link_count(dir); | |
1da177e4 LT |
282 | } |
283 | } | |
284 | unlock_kernel(); | |
285 | return err; | |
286 | } | |
287 | ||
b71034e5 ED |
288 | static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry, |
289 | struct inode *new_dir, struct dentry *new_dentry) | |
1da177e4 LT |
290 | { |
291 | struct inode *old_inode = old_dentry->d_inode; | |
292 | struct inode *new_inode = new_dentry->d_inode; | |
b71034e5 ED |
293 | struct page *dir_page = NULL; |
294 | struct ufs_dir_entry * dir_de = NULL; | |
295 | struct page *old_page; | |
1da177e4 LT |
296 | struct ufs_dir_entry *old_de; |
297 | int err = -ENOENT; | |
298 | ||
871a2931 CH |
299 | dquot_initialize(old_dir); |
300 | dquot_initialize(new_dir); | |
907f4554 | 301 | |
08049707 | 302 | old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page); |
1da177e4 LT |
303 | if (!old_de) |
304 | goto out; | |
305 | ||
306 | if (S_ISDIR(old_inode->i_mode)) { | |
307 | err = -EIO; | |
b71034e5 | 308 | dir_de = ufs_dotdot(old_inode, &dir_page); |
1da177e4 LT |
309 | if (!dir_de) |
310 | goto out_old; | |
311 | } | |
312 | ||
313 | if (new_inode) { | |
b71034e5 | 314 | struct page *new_page; |
1da177e4 LT |
315 | struct ufs_dir_entry *new_de; |
316 | ||
317 | err = -ENOTEMPTY; | |
b71034e5 | 318 | if (dir_de && !ufs_empty_dir(new_inode)) |
1da177e4 | 319 | goto out_dir; |
b71034e5 | 320 | |
1da177e4 | 321 | err = -ENOENT; |
08049707 | 322 | new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page); |
1da177e4 LT |
323 | if (!new_de) |
324 | goto out_dir; | |
3257545e | 325 | inode_inc_link_count(old_inode); |
b71034e5 | 326 | ufs_set_link(new_dir, new_de, new_page, old_inode); |
1da177e4 LT |
327 | new_inode->i_ctime = CURRENT_TIME_SEC; |
328 | if (dir_de) | |
9a53c3a7 | 329 | drop_nlink(new_inode); |
3257545e | 330 | inode_dec_link_count(new_inode); |
1da177e4 LT |
331 | } else { |
332 | if (dir_de) { | |
333 | err = -EMLINK; | |
334 | if (new_dir->i_nlink >= UFS_LINK_MAX) | |
335 | goto out_dir; | |
336 | } | |
3257545e | 337 | inode_inc_link_count(old_inode); |
1da177e4 LT |
338 | err = ufs_add_link(new_dentry, old_inode); |
339 | if (err) { | |
3257545e | 340 | inode_dec_link_count(old_inode); |
1da177e4 LT |
341 | goto out_dir; |
342 | } | |
343 | if (dir_de) | |
3257545e | 344 | inode_inc_link_count(new_dir); |
1da177e4 LT |
345 | } |
346 | ||
b71034e5 ED |
347 | /* |
348 | * Like most other Unix systems, set the ctime for inodes on a | |
349 | * rename. | |
350 | * inode_dec_link_count() will mark the inode dirty. | |
351 | */ | |
352 | old_inode->i_ctime = CURRENT_TIME_SEC; | |
1da177e4 | 353 | |
b71034e5 | 354 | ufs_delete_entry(old_dir, old_de, old_page); |
3257545e | 355 | inode_dec_link_count(old_inode); |
1da177e4 LT |
356 | |
357 | if (dir_de) { | |
b71034e5 | 358 | ufs_set_link(old_inode, dir_de, dir_page, new_dir); |
3257545e | 359 | inode_dec_link_count(old_dir); |
1da177e4 | 360 | } |
1da177e4 LT |
361 | return 0; |
362 | ||
b71034e5 | 363 | |
1da177e4 | 364 | out_dir: |
b71034e5 ED |
365 | if (dir_de) { |
366 | kunmap(dir_page); | |
367 | page_cache_release(dir_page); | |
368 | } | |
1da177e4 | 369 | out_old: |
b71034e5 ED |
370 | kunmap(old_page); |
371 | page_cache_release(old_page); | |
1da177e4 | 372 | out: |
1da177e4 LT |
373 | return err; |
374 | } | |
375 | ||
c5ef1c42 | 376 | const struct inode_operations ufs_dir_inode_operations = { |
1da177e4 LT |
377 | .create = ufs_create, |
378 | .lookup = ufs_lookup, | |
379 | .link = ufs_link, | |
380 | .unlink = ufs_unlink, | |
381 | .symlink = ufs_symlink, | |
382 | .mkdir = ufs_mkdir, | |
383 | .rmdir = ufs_rmdir, | |
384 | .mknod = ufs_mknod, | |
385 | .rename = ufs_rename, | |
386 | }; |