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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 inode_nohighmem(inode);
187 if (test_opt(inode->i_sb, NOBH))
188 inode->i_mapping->a_ops = &ext2_nobh_aops;
189 else
190 inode->i_mapping->a_ops = &ext2_aops;
191 err = page_symlink(inode, symname, l);
192 if (err)
193 goto out_fail;
194 } else {
195
196 inode->i_op = &ext2_fast_symlink_inode_operations;
197 inode->i_link = (char*)EXT2_I(inode)->i_data;
198 memcpy(inode->i_link, symname, l);
199 inode->i_size = l-1;
200 }
201 mark_inode_dirty(inode);
202
203 err = ext2_add_nondir(dentry, inode);
204out:
205 return err;
206
207out_fail:
208 inode_dec_link_count(inode);
209 unlock_new_inode(inode);
210 iput (inode);
211 goto out;
212}
213
214static int ext2_link (struct dentry * old_dentry, struct inode * dir,
215 struct dentry *dentry)
216{
217 struct inode *inode = d_inode(old_dentry);
218 int err;
219
220 err = dquot_initialize(dir);
221 if (err)
222 return err;
223
224 inode->i_ctime = CURRENT_TIME_SEC;
225 inode_inc_link_count(inode);
226 ihold(inode);
227
228 err = ext2_add_link(dentry, inode);
229 if (!err) {
230 d_instantiate(dentry, inode);
231 return 0;
232 }
233 inode_dec_link_count(inode);
234 iput(inode);
235 return err;
236}
237
238static int ext2_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
239{
240 struct inode * inode;
241 int err;
242
243 err = dquot_initialize(dir);
244 if (err)
245 return err;
246
247 inode_inc_link_count(dir);
248
249 inode = ext2_new_inode(dir, S_IFDIR | mode, &dentry->d_name);
250 err = PTR_ERR(inode);
251 if (IS_ERR(inode))
252 goto out_dir;
253
254 inode->i_op = &ext2_dir_inode_operations;
255 inode->i_fop = &ext2_dir_operations;
256 if (test_opt(inode->i_sb, NOBH))
257 inode->i_mapping->a_ops = &ext2_nobh_aops;
258 else
259 inode->i_mapping->a_ops = &ext2_aops;
260
261 inode_inc_link_count(inode);
262
263 err = ext2_make_empty(inode, dir);
264 if (err)
265 goto out_fail;
266
267 err = ext2_add_link(dentry, inode);
268 if (err)
269 goto out_fail;
270
271 unlock_new_inode(inode);
272 d_instantiate(dentry, inode);
273out:
274 return err;
275
276out_fail:
277 inode_dec_link_count(inode);
278 inode_dec_link_count(inode);
279 unlock_new_inode(inode);
280 iput(inode);
281out_dir:
282 inode_dec_link_count(dir);
283 goto out;
284}
285
286static int ext2_unlink(struct inode * dir, struct dentry *dentry)
287{
288 struct inode * inode = d_inode(dentry);
289 struct ext2_dir_entry_2 * de;
290 struct page * page;
291 int err;
292
293 err = dquot_initialize(dir);
294 if (err)
295 goto out;
296
297 de = ext2_find_entry (dir, &dentry->d_name, &page);
298 if (!de) {
299 err = -ENOENT;
300 goto out;
301 }
302
303 err = ext2_delete_entry (de, page);
304 if (err)
305 goto out;
306
307 inode->i_ctime = dir->i_ctime;
308 inode_dec_link_count(inode);
309 err = 0;
310out:
311 return err;
312}
313
314static int ext2_rmdir (struct inode * dir, struct dentry *dentry)
315{
316 struct inode * inode = d_inode(dentry);
317 int err = -ENOTEMPTY;
318
319 if (ext2_empty_dir(inode)) {
320 err = ext2_unlink(dir, dentry);
321 if (!err) {
322 inode->i_size = 0;
323 inode_dec_link_count(inode);
324 inode_dec_link_count(dir);
325 }
326 }
327 return err;
328}
329
330static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry,
331 struct inode * new_dir, struct dentry * new_dentry )
332{
333 struct inode * old_inode = d_inode(old_dentry);
334 struct inode * new_inode = d_inode(new_dentry);
335 struct page * dir_page = NULL;
336 struct ext2_dir_entry_2 * dir_de = NULL;
337 struct page * old_page;
338 struct ext2_dir_entry_2 * old_de;
339 int err;
340
341 err = dquot_initialize(old_dir);
342 if (err)
343 goto out;
344
345 err = dquot_initialize(new_dir);
346 if (err)
347 goto out;
348
349 old_de = ext2_find_entry (old_dir, &old_dentry->d_name, &old_page);
350 if (!old_de) {
351 err = -ENOENT;
352 goto out;
353 }
354
355 if (S_ISDIR(old_inode->i_mode)) {
356 err = -EIO;
357 dir_de = ext2_dotdot(old_inode, &dir_page);
358 if (!dir_de)
359 goto out_old;
360 }
361
362 if (new_inode) {
363 struct page *new_page;
364 struct ext2_dir_entry_2 *new_de;
365
366 err = -ENOTEMPTY;
367 if (dir_de && !ext2_empty_dir (new_inode))
368 goto out_dir;
369
370 err = -ENOENT;
371 new_de = ext2_find_entry (new_dir, &new_dentry->d_name, &new_page);
372 if (!new_de)
373 goto out_dir;
374 ext2_set_link(new_dir, new_de, new_page, old_inode, 1);
375 new_inode->i_ctime = CURRENT_TIME_SEC;
376 if (dir_de)
377 drop_nlink(new_inode);
378 inode_dec_link_count(new_inode);
379 } else {
380 err = ext2_add_link(new_dentry, old_inode);
381 if (err)
382 goto out_dir;
383 if (dir_de)
384 inode_inc_link_count(new_dir);
385 }
386
387
388
389
390
391 old_inode->i_ctime = CURRENT_TIME_SEC;
392 mark_inode_dirty(old_inode);
393
394 ext2_delete_entry (old_de, old_page);
395
396 if (dir_de) {
397 if (old_dir != new_dir)
398 ext2_set_link(old_inode, dir_de, dir_page, new_dir, 0);
399 else {
400 kunmap(dir_page);
401 put_page(dir_page);
402 }
403 inode_dec_link_count(old_dir);
404 }
405 return 0;
406
407
408out_dir:
409 if (dir_de) {
410 kunmap(dir_page);
411 put_page(dir_page);
412 }
413out_old:
414 kunmap(old_page);
415 put_page(old_page);
416out:
417 return err;
418}
419
420const struct inode_operations ext2_dir_inode_operations = {
421 .create = ext2_create,
422 .lookup = ext2_lookup,
423 .link = ext2_link,
424 .unlink = ext2_unlink,
425 .symlink = ext2_symlink,
426 .mkdir = ext2_mkdir,
427 .rmdir = ext2_rmdir,
428 .mknod = ext2_mknod,
429 .rename = ext2_rename,
430#ifdef CONFIG_EXT2_FS_XATTR
431 .setxattr = generic_setxattr,
432 .getxattr = generic_getxattr,
433 .listxattr = ext2_listxattr,
434 .removexattr = generic_removexattr,
435#endif
436 .setattr = ext2_setattr,
437 .get_acl = ext2_get_acl,
438 .set_acl = ext2_set_acl,
439 .tmpfile = ext2_tmpfile,
440};
441
442const struct inode_operations ext2_special_inode_operations = {
443#ifdef CONFIG_EXT2_FS_XATTR
444 .setxattr = generic_setxattr,
445 .getxattr = generic_getxattr,
446 .listxattr = ext2_listxattr,
447 .removexattr = generic_removexattr,
448#endif
449 .setattr = ext2_setattr,
450 .get_acl = ext2_get_acl,
451 .set_acl = ext2_set_acl,
452};
453
