Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/ufs/namei.c | |
3 | * | |
4 | * Copyright (C) 1998 | |
5 | * Daniel Pirkl <daniel.pirkl@email.cz> | |
6 | * Charles University, Faculty of Mathematics and Physics | |
7 | * | |
8 | * from | |
9 | * | |
10 | * linux/fs/ext2/namei.c | |
11 | * | |
12 | * Copyright (C) 1992, 1993, 1994, 1995 | |
13 | * Remy Card (card@masi.ibp.fr) | |
14 | * Laboratoire MASI - Institut Blaise Pascal | |
15 | * Universite Pierre et Marie Curie (Paris VI) | |
16 | * | |
17 | * from | |
18 | * | |
19 | * linux/fs/minix/namei.c | |
20 | * | |
21 | * Copyright (C) 1991, 1992 Linus Torvalds | |
22 | * | |
23 | * Big-endian to little-endian byte-swapping/bitmaps by | |
24 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
25 | */ | |
26 | ||
27 | #include <linux/time.h> | |
28 | #include <linux/fs.h> | |
29 | #include <linux/ufs_fs.h> | |
30 | #include <linux/smp_lock.h> | |
31 | #include <linux/buffer_head.h> | |
32 | #include "swab.h" /* will go away - see comment in mknod() */ | |
33 | #include "util.h" | |
34 | ||
35 | /* | |
36 | #undef UFS_NAMEI_DEBUG | |
37 | */ | |
38 | #define UFS_NAMEI_DEBUG | |
39 | ||
40 | #ifdef UFS_NAMEI_DEBUG | |
41 | #define UFSD(x) printk("(%s, %d), %s: ", __FILE__, __LINE__, __FUNCTION__); printk x; | |
42 | #else | |
43 | #define UFSD(x) | |
44 | #endif | |
45 | ||
46 | static inline void ufs_inc_count(struct inode *inode) | |
47 | { | |
48 | inode->i_nlink++; | |
49 | mark_inode_dirty(inode); | |
50 | } | |
51 | ||
52 | static inline void ufs_dec_count(struct inode *inode) | |
53 | { | |
54 | inode->i_nlink--; | |
55 | mark_inode_dirty(inode); | |
56 | } | |
57 | ||
58 | static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode) | |
59 | { | |
60 | int err = ufs_add_link(dentry, inode); | |
61 | if (!err) { | |
62 | d_instantiate(dentry, inode); | |
63 | return 0; | |
64 | } | |
65 | ufs_dec_count(inode); | |
66 | iput(inode); | |
67 | return err; | |
68 | } | |
69 | ||
70 | static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd) | |
71 | { | |
72 | struct inode * inode = NULL; | |
73 | ino_t ino; | |
74 | ||
75 | if (dentry->d_name.len > UFS_MAXNAMLEN) | |
76 | return ERR_PTR(-ENAMETOOLONG); | |
77 | ||
78 | lock_kernel(); | |
79 | ino = ufs_inode_by_name(dir, dentry); | |
80 | if (ino) { | |
81 | inode = iget(dir->i_sb, ino); | |
82 | if (!inode) { | |
83 | unlock_kernel(); | |
84 | return ERR_PTR(-EACCES); | |
85 | } | |
86 | } | |
87 | unlock_kernel(); | |
88 | d_add(dentry, inode); | |
89 | return NULL; | |
90 | } | |
91 | ||
92 | /* | |
93 | * By the time this is called, we already have created | |
94 | * the directory cache entry for the new file, but it | |
95 | * is so far negative - it has no inode. | |
96 | * | |
97 | * If the create succeeds, we fill in the inode information | |
98 | * with d_instantiate(). | |
99 | */ | |
100 | static int ufs_create (struct inode * dir, struct dentry * dentry, int mode, | |
101 | struct nameidata *nd) | |
102 | { | |
103 | struct inode * inode = ufs_new_inode(dir, mode); | |
104 | int err = PTR_ERR(inode); | |
105 | if (!IS_ERR(inode)) { | |
106 | inode->i_op = &ufs_file_inode_operations; | |
107 | inode->i_fop = &ufs_file_operations; | |
108 | inode->i_mapping->a_ops = &ufs_aops; | |
109 | mark_inode_dirty(inode); | |
110 | lock_kernel(); | |
111 | err = ufs_add_nondir(dentry, inode); | |
112 | unlock_kernel(); | |
113 | } | |
114 | return err; | |
115 | } | |
116 | ||
117 | static int ufs_mknod (struct inode * dir, struct dentry *dentry, int mode, dev_t rdev) | |
118 | { | |
119 | struct inode *inode; | |
120 | int err; | |
121 | ||
122 | if (!old_valid_dev(rdev)) | |
123 | return -EINVAL; | |
124 | inode = ufs_new_inode(dir, mode); | |
125 | err = PTR_ERR(inode); | |
126 | if (!IS_ERR(inode)) { | |
127 | init_special_inode(inode, mode, rdev); | |
128 | /* NOTE: that'll go when we get wide dev_t */ | |
129 | ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev); | |
130 | mark_inode_dirty(inode); | |
131 | lock_kernel(); | |
132 | err = ufs_add_nondir(dentry, inode); | |
133 | unlock_kernel(); | |
134 | } | |
135 | return err; | |
136 | } | |
137 | ||
138 | static int ufs_symlink (struct inode * dir, struct dentry * dentry, | |
139 | const char * symname) | |
140 | { | |
141 | struct super_block * sb = dir->i_sb; | |
142 | int err = -ENAMETOOLONG; | |
143 | unsigned l = strlen(symname)+1; | |
144 | struct inode * inode; | |
145 | ||
146 | if (l > sb->s_blocksize) | |
147 | goto out; | |
148 | ||
149 | lock_kernel(); | |
150 | inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO); | |
151 | err = PTR_ERR(inode); | |
152 | if (IS_ERR(inode)) | |
153 | goto out; | |
154 | ||
155 | if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) { | |
156 | /* slow symlink */ | |
157 | inode->i_op = &page_symlink_inode_operations; | |
158 | inode->i_mapping->a_ops = &ufs_aops; | |
159 | err = page_symlink(inode, symname, l); | |
160 | if (err) | |
161 | goto out_fail; | |
162 | } else { | |
163 | /* fast symlink */ | |
164 | inode->i_op = &ufs_fast_symlink_inode_operations; | |
165 | memcpy((char*)&UFS_I(inode)->i_u1.i_data,symname,l); | |
166 | inode->i_size = l-1; | |
167 | } | |
168 | mark_inode_dirty(inode); | |
169 | ||
170 | err = ufs_add_nondir(dentry, inode); | |
171 | out: | |
172 | unlock_kernel(); | |
173 | return err; | |
174 | ||
175 | out_fail: | |
176 | ufs_dec_count(inode); | |
177 | iput(inode); | |
178 | goto out; | |
179 | } | |
180 | ||
181 | static int ufs_link (struct dentry * old_dentry, struct inode * dir, | |
182 | struct dentry *dentry) | |
183 | { | |
184 | struct inode *inode = old_dentry->d_inode; | |
185 | int error; | |
186 | ||
187 | lock_kernel(); | |
188 | if (inode->i_nlink >= UFS_LINK_MAX) { | |
189 | unlock_kernel(); | |
190 | return -EMLINK; | |
191 | } | |
192 | ||
193 | inode->i_ctime = CURRENT_TIME_SEC; | |
194 | ufs_inc_count(inode); | |
195 | atomic_inc(&inode->i_count); | |
196 | ||
197 | error = ufs_add_nondir(dentry, inode); | |
198 | unlock_kernel(); | |
199 | return error; | |
200 | } | |
201 | ||
202 | static int ufs_mkdir(struct inode * dir, struct dentry * dentry, int mode) | |
203 | { | |
204 | struct inode * inode; | |
205 | int err = -EMLINK; | |
206 | ||
207 | if (dir->i_nlink >= UFS_LINK_MAX) | |
208 | goto out; | |
209 | ||
210 | lock_kernel(); | |
211 | ufs_inc_count(dir); | |
212 | ||
213 | inode = ufs_new_inode(dir, S_IFDIR|mode); | |
214 | err = PTR_ERR(inode); | |
215 | if (IS_ERR(inode)) | |
216 | goto out_dir; | |
217 | ||
218 | inode->i_op = &ufs_dir_inode_operations; | |
219 | inode->i_fop = &ufs_dir_operations; | |
220 | ||
221 | ufs_inc_count(inode); | |
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: | |
237 | ufs_dec_count(inode); | |
238 | ufs_dec_count(inode); | |
239 | iput (inode); | |
240 | out_dir: | |
241 | ufs_dec_count(dir); | |
242 | unlock_kernel(); | |
243 | goto out; | |
244 | } | |
245 | ||
246 | static int ufs_unlink(struct inode * dir, struct dentry *dentry) | |
247 | { | |
248 | struct inode * inode = dentry->d_inode; | |
249 | struct buffer_head * bh; | |
250 | struct ufs_dir_entry * de; | |
251 | int err = -ENOENT; | |
252 | ||
253 | lock_kernel(); | |
254 | de = ufs_find_entry (dentry, &bh); | |
255 | if (!de) | |
256 | goto out; | |
257 | ||
258 | err = ufs_delete_entry (dir, de, bh); | |
259 | if (err) | |
260 | goto out; | |
261 | ||
262 | inode->i_ctime = dir->i_ctime; | |
263 | ufs_dec_count(inode); | |
264 | err = 0; | |
265 | out: | |
266 | unlock_kernel(); | |
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; | |
280 | ufs_dec_count(inode); | |
281 | ufs_dec_count(dir); | |
282 | } | |
283 | } | |
284 | unlock_kernel(); | |
285 | return err; | |
286 | } | |
287 | ||
288 | static int ufs_rename (struct inode * old_dir, struct dentry * old_dentry, | |
289 | struct inode * new_dir, struct dentry * new_dentry ) | |
290 | { | |
291 | struct inode *old_inode = old_dentry->d_inode; | |
292 | struct inode *new_inode = new_dentry->d_inode; | |
293 | struct buffer_head *dir_bh = NULL; | |
294 | struct ufs_dir_entry *dir_de = NULL; | |
295 | struct buffer_head *old_bh; | |
296 | struct ufs_dir_entry *old_de; | |
297 | int err = -ENOENT; | |
298 | ||
299 | lock_kernel(); | |
300 | old_de = ufs_find_entry (old_dentry, &old_bh); | |
301 | if (!old_de) | |
302 | goto out; | |
303 | ||
304 | if (S_ISDIR(old_inode->i_mode)) { | |
305 | err = -EIO; | |
306 | dir_de = ufs_dotdot(old_inode, &dir_bh); | |
307 | if (!dir_de) | |
308 | goto out_old; | |
309 | } | |
310 | ||
311 | if (new_inode) { | |
312 | struct buffer_head *new_bh; | |
313 | struct ufs_dir_entry *new_de; | |
314 | ||
315 | err = -ENOTEMPTY; | |
316 | if (dir_de && !ufs_empty_dir (new_inode)) | |
317 | goto out_dir; | |
318 | err = -ENOENT; | |
319 | new_de = ufs_find_entry (new_dentry, &new_bh); | |
320 | if (!new_de) | |
321 | goto out_dir; | |
322 | ufs_inc_count(old_inode); | |
323 | ufs_set_link(new_dir, new_de, new_bh, old_inode); | |
324 | new_inode->i_ctime = CURRENT_TIME_SEC; | |
325 | if (dir_de) | |
326 | new_inode->i_nlink--; | |
327 | ufs_dec_count(new_inode); | |
328 | } else { | |
329 | if (dir_de) { | |
330 | err = -EMLINK; | |
331 | if (new_dir->i_nlink >= UFS_LINK_MAX) | |
332 | goto out_dir; | |
333 | } | |
334 | ufs_inc_count(old_inode); | |
335 | err = ufs_add_link(new_dentry, old_inode); | |
336 | if (err) { | |
337 | ufs_dec_count(old_inode); | |
338 | goto out_dir; | |
339 | } | |
340 | if (dir_de) | |
341 | ufs_inc_count(new_dir); | |
342 | } | |
343 | ||
344 | ufs_delete_entry (old_dir, old_de, old_bh); | |
345 | ||
346 | ufs_dec_count(old_inode); | |
347 | ||
348 | if (dir_de) { | |
349 | ufs_set_link(old_inode, dir_de, dir_bh, new_dir); | |
350 | ufs_dec_count(old_dir); | |
351 | } | |
352 | unlock_kernel(); | |
353 | return 0; | |
354 | ||
355 | out_dir: | |
356 | if (dir_de) | |
357 | brelse(dir_bh); | |
358 | out_old: | |
359 | brelse (old_bh); | |
360 | out: | |
361 | unlock_kernel(); | |
362 | return err; | |
363 | } | |
364 | ||
365 | struct inode_operations ufs_dir_inode_operations = { | |
366 | .create = ufs_create, | |
367 | .lookup = ufs_lookup, | |
368 | .link = ufs_link, | |
369 | .unlink = ufs_unlink, | |
370 | .symlink = ufs_symlink, | |
371 | .mkdir = ufs_mkdir, | |
372 | .rmdir = ufs_rmdir, | |
373 | .mknod = ufs_mknod, | |
374 | .rename = ufs_rename, | |
375 | }; |