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