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33#include <linux/pagemap.h>
34#include <linux/quotaops.h>
35#include "ext2.h"
36#include "xattr.h"
37#include "acl.h"
38
39static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
40{
41 int err = ext2_add_link(dentry, inode);
42 if (!err) {
43 unlock_new_inode(inode);
44 d_instantiate(dentry, inode);
45 return 0;
46 }
47 inode_dec_link_count(inode);
48 unlock_new_inode(inode);
49 iput(inode);
50 return err;
51}
52
53
54
55
56
57static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags)
58{
59 struct inode * inode;
60 ino_t ino;
61
62 if (dentry->d_name.len > EXT2_NAME_LEN)
63 return ERR_PTR(-ENAMETOOLONG);
64
65 ino = ext2_inode_by_name(dir, &dentry->d_name);
66 inode = NULL;
67 if (ino) {
68 inode = ext2_iget(dir->i_sb, ino);
69 if (inode == ERR_PTR(-ESTALE)) {
70 ext2_error(dir->i_sb, __func__,
71 "deleted inode referenced: %lu",
72 (unsigned long) ino);
73 return ERR_PTR(-EIO);
74 }
75 }
76 return d_splice_alias(inode, dentry);
77}
78
79struct dentry *ext2_get_parent(struct dentry *child)
80{
81 struct qstr dotdot = QSTR_INIT("..", 2);
82 unsigned long ino = ext2_inode_by_name(d_inode(child), &dotdot);
83 if (!ino)
84 return ERR_PTR(-ENOENT);
85 return d_obtain_alias(ext2_iget(d_inode(child)->i_sb, ino));
86}
87
88
89
90
91
92
93
94
95
96static int ext2_create (struct inode * dir, struct dentry * dentry, umode_t mode, bool excl)
97{
98 struct inode *inode;
99 int err;
100
101 err = dquot_initialize(dir);
102 if (err)
103 return err;
104
105 inode = ext2_new_inode(dir, mode, &dentry->d_name);
106 if (IS_ERR(inode))
107 return PTR_ERR(inode);
108
109 inode->i_op = &ext2_file_inode_operations;
110 if (test_opt(inode->i_sb, NOBH)) {
111 inode->i_mapping->a_ops = &ext2_nobh_aops;
112 inode->i_fop = &ext2_file_operations;
113 } else {
114 inode->i_mapping->a_ops = &ext2_aops;
115 inode->i_fop = &ext2_file_operations;
116 }
117 mark_inode_dirty(inode);
118 return ext2_add_nondir(dentry, inode);
119}
120
121static int ext2_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
122{
123 struct inode *inode = ext2_new_inode(dir, mode, NULL);
124 if (IS_ERR(inode))
125 return PTR_ERR(inode);
126
127 inode->i_op = &ext2_file_inode_operations;
128 if (test_opt(inode->i_sb, NOBH)) {
129 inode->i_mapping->a_ops = &ext2_nobh_aops;
130 inode->i_fop = &ext2_file_operations;
131 } else {
132 inode->i_mapping->a_ops = &ext2_aops;
133 inode->i_fop = &ext2_file_operations;
134 }
135 mark_inode_dirty(inode);
136 d_tmpfile(dentry, inode);
137 unlock_new_inode(inode);
138 return 0;
139}
140
141static int ext2_mknod (struct inode * dir, struct dentry *dentry, umode_t mode, dev_t rdev)
142{
143 struct inode * inode;
144 int err;
145
146 err = dquot_initialize(dir);
147 if (err)
148 return err;
149
150 inode = ext2_new_inode (dir, mode, &dentry->d_name);
151 err = PTR_ERR(inode);
152 if (!IS_ERR(inode)) {
153 init_special_inode(inode, inode->i_mode, rdev);
154#ifdef CONFIG_EXT2_FS_XATTR
155 inode->i_op = &ext2_special_inode_operations;
156#endif
157 mark_inode_dirty(inode);
158 err = ext2_add_nondir(dentry, inode);
159 }
160 return err;
161}
162
163static int ext2_symlink (struct inode * dir, struct dentry * dentry,
164 const char * symname)
165{
166 struct super_block * sb = dir->i_sb;
167 int err = -ENAMETOOLONG;
168 unsigned l = strlen(symname)+1;
169 struct inode * inode;
170
171 if (l > sb->s_blocksize)
172 goto out;
173
174 err = dquot_initialize(dir);
175 if (err)
176 goto out;
177
178 inode = ext2_new_inode (dir, S_IFLNK | S_IRWXUGO, &dentry->d_name);
179 err = PTR_ERR(inode);
180 if (IS_ERR(inode))
181 goto out;
182
183 if (l > sizeof (EXT2_I(inode)->i_data)) {
184
185 inode->i_op = &ext2_symlink_inode_operations;
186 if (test_opt(inode->i_sb, NOBH))
187 inode->i_mapping->a_ops = &ext2_nobh_aops;
188 else
189 inode->i_mapping->a_ops = &ext2_aops;
190 err = page_symlink(inode, symname, l);
191 if (err)
192 goto out_fail;
193 } else {
194
195 inode->i_op = &ext2_fast_symlink_inode_operations;
196 inode->i_link = (char*)EXT2_I(inode)->i_data;
197 memcpy(inode->i_link, symname, l);
198 inode->i_size = l-1;
199 }
200 mark_inode_dirty(inode);
201
202 err = ext2_add_nondir(dentry, inode);
203out:
204 return err;
205
206out_fail:
207 inode_dec_link_count(inode);
208 unlock_new_inode(inode);
209 iput (inode);
210 goto out;
211}
212
213static int ext2_link (struct dentry * old_dentry, struct inode * dir,
214 struct dentry *dentry)
215{
216 struct inode *inode = d_inode(old_dentry);
217 int err;
218
219 err = dquot_initialize(dir);
220 if (err)
221 return err;
222
223 inode->i_ctime = CURRENT_TIME_SEC;
224 inode_inc_link_count(inode);
225 ihold(inode);
226
227 err = ext2_add_link(dentry, inode);
228 if (!err) {
229 d_instantiate(dentry, inode);
230 return 0;
231 }
232 inode_dec_link_count(inode);
233 iput(inode);
234 return err;
235}
236
237static int ext2_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
238{
239 struct inode * inode;
240 int err;
241
242 err = dquot_initialize(dir);
243 if (err)
244 return err;
245
246 inode_inc_link_count(dir);
247
248 inode = ext2_new_inode(dir, S_IFDIR | mode, &dentry->d_name);
249 err = PTR_ERR(inode);
250 if (IS_ERR(inode))
251 goto out_dir;
252
253 inode->i_op = &ext2_dir_inode_operations;
254 inode->i_fop = &ext2_dir_operations;
255 if (test_opt(inode->i_sb, NOBH))
256 inode->i_mapping->a_ops = &ext2_nobh_aops;
257 else
258 inode->i_mapping->a_ops = &ext2_aops;
259
260 inode_inc_link_count(inode);
261
262 err = ext2_make_empty(inode, dir);
263 if (err)
264 goto out_fail;
265
266 err = ext2_add_link(dentry, inode);
267 if (err)
268 goto out_fail;
269
270 unlock_new_inode(inode);
271 d_instantiate(dentry, inode);
272out:
273 return err;
274
275out_fail:
276 inode_dec_link_count(inode);
277 inode_dec_link_count(inode);
278 unlock_new_inode(inode);
279 iput(inode);
280out_dir:
281 inode_dec_link_count(dir);
282 goto out;
283}
284
285static int ext2_unlink(struct inode * dir, struct dentry *dentry)
286{
287 struct inode * inode = d_inode(dentry);
288 struct ext2_dir_entry_2 * de;
289 struct page * page;
290 int err;
291
292 err = dquot_initialize(dir);
293 if (err)
294 goto out;
295
296 de = ext2_find_entry (dir, &dentry->d_name, &page);
297 if (!de) {
298 err = -ENOENT;
299 goto out;
300 }
301
302 err = ext2_delete_entry (de, page);
303 if (err)
304 goto out;
305
306 inode->i_ctime = dir->i_ctime;
307 inode_dec_link_count(inode);
308 err = 0;
309out:
310 return err;
311}
312
313static int ext2_rmdir (struct inode * dir, struct dentry *dentry)
314{
315 struct inode * inode = d_inode(dentry);
316 int err = -ENOTEMPTY;
317
318 if (ext2_empty_dir(inode)) {
319 err = ext2_unlink(dir, dentry);
320 if (!err) {
321 inode->i_size = 0;
322 inode_dec_link_count(inode);
323 inode_dec_link_count(dir);
324 }
325 }
326 return err;
327}
328
329static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry,
330 struct inode * new_dir, struct dentry * new_dentry )
331{
332 struct inode * old_inode = d_inode(old_dentry);
333 struct inode * new_inode = d_inode(new_dentry);
334 struct page * dir_page = NULL;
335 struct ext2_dir_entry_2 * dir_de = NULL;
336 struct page * old_page;
337 struct ext2_dir_entry_2 * old_de;
338 int err;
339
340 err = dquot_initialize(old_dir);
341 if (err)
342 goto out;
343
344 err = dquot_initialize(new_dir);
345 if (err)
346 goto out;
347
348 old_de = ext2_find_entry (old_dir, &old_dentry->d_name, &old_page);
349 if (!old_de) {
350 err = -ENOENT;
351 goto out;
352 }
353
354 if (S_ISDIR(old_inode->i_mode)) {
355 err = -EIO;
356 dir_de = ext2_dotdot(old_inode, &dir_page);
357 if (!dir_de)
358 goto out_old;
359 }
360
361 if (new_inode) {
362 struct page *new_page;
363 struct ext2_dir_entry_2 *new_de;
364
365 err = -ENOTEMPTY;
366 if (dir_de && !ext2_empty_dir (new_inode))
367 goto out_dir;
368
369 err = -ENOENT;
370 new_de = ext2_find_entry (new_dir, &new_dentry->d_name, &new_page);
371 if (!new_de)
372 goto out_dir;
373 ext2_set_link(new_dir, new_de, new_page, old_inode, 1);
374 new_inode->i_ctime = CURRENT_TIME_SEC;
375 if (dir_de)
376 drop_nlink(new_inode);
377 inode_dec_link_count(new_inode);
378 } else {
379 err = ext2_add_link(new_dentry, old_inode);
380 if (err)
381 goto out_dir;
382 if (dir_de)
383 inode_inc_link_count(new_dir);
384 }
385
386
387
388
389
390 old_inode->i_ctime = CURRENT_TIME_SEC;
391 mark_inode_dirty(old_inode);
392
393 ext2_delete_entry (old_de, old_page);
394
395 if (dir_de) {
396 if (old_dir != new_dir)
397 ext2_set_link(old_inode, dir_de, dir_page, new_dir, 0);
398 else {
399 kunmap(dir_page);
400 page_cache_release(dir_page);
401 }
402 inode_dec_link_count(old_dir);
403 }
404 return 0;
405
406
407out_dir:
408 if (dir_de) {
409 kunmap(dir_page);
410 page_cache_release(dir_page);
411 }
412out_old:
413 kunmap(old_page);
414 page_cache_release(old_page);
415out:
416 return err;
417}
418
419const struct inode_operations ext2_dir_inode_operations = {
420 .create = ext2_create,
421 .lookup = ext2_lookup,
422 .link = ext2_link,
423 .unlink = ext2_unlink,
424 .symlink = ext2_symlink,
425 .mkdir = ext2_mkdir,
426 .rmdir = ext2_rmdir,
427 .mknod = ext2_mknod,
428 .rename = ext2_rename,
429#ifdef CONFIG_EXT2_FS_XATTR
430 .setxattr = generic_setxattr,
431 .getxattr = generic_getxattr,
432 .listxattr = ext2_listxattr,
433 .removexattr = generic_removexattr,
434#endif
435 .setattr = ext2_setattr,
436 .get_acl = ext2_get_acl,
437 .set_acl = ext2_set_acl,
438 .tmpfile = ext2_tmpfile,
439};
440
441const struct inode_operations ext2_special_inode_operations = {
442#ifdef CONFIG_EXT2_FS_XATTR
443 .setxattr = generic_setxattr,
444 .getxattr = generic_getxattr,
445 .listxattr = ext2_listxattr,
446 .removexattr = generic_removexattr,
447#endif
448 .setattr = ext2_setattr,
449 .get_acl = ext2_get_acl,
450 .set_acl = ext2_set_acl,
451};
452
