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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(child->d_inode, &dotdot);
83 if (!ino)
84 return ERR_PTR(-ENOENT);
85 return d_obtain_alias(ext2_iget(child->d_inode->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
100 dquot_initialize(dir);
101
102 inode = ext2_new_inode(dir, mode, &dentry->d_name);
103 if (IS_ERR(inode))
104 return PTR_ERR(inode);
105
106 inode->i_op = &ext2_file_inode_operations;
107 if (test_opt(inode->i_sb, DAX)) {
108 inode->i_mapping->a_ops = &ext2_aops;
109 inode->i_fop = &ext2_dax_file_operations;
110 } else 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, DAX)) {
129 inode->i_mapping->a_ops = &ext2_aops;
130 inode->i_fop = &ext2_dax_file_operations;
131 } else if (test_opt(inode->i_sb, NOBH)) {
132 inode->i_mapping->a_ops = &ext2_nobh_aops;
133 inode->i_fop = &ext2_file_operations;
134 } else {
135 inode->i_mapping->a_ops = &ext2_aops;
136 inode->i_fop = &ext2_file_operations;
137 }
138 mark_inode_dirty(inode);
139 d_tmpfile(dentry, inode);
140 unlock_new_inode(inode);
141 return 0;
142}
143
144static int ext2_mknod (struct inode * dir, struct dentry *dentry, umode_t mode, dev_t rdev)
145{
146 struct inode * inode;
147 int err;
148
149 if (!new_valid_dev(rdev))
150 return -EINVAL;
151
152 dquot_initialize(dir);
153
154 inode = ext2_new_inode (dir, mode, &dentry->d_name);
155 err = PTR_ERR(inode);
156 if (!IS_ERR(inode)) {
157 init_special_inode(inode, inode->i_mode, rdev);
158#ifdef CONFIG_EXT2_FS_XATTR
159 inode->i_op = &ext2_special_inode_operations;
160#endif
161 mark_inode_dirty(inode);
162 err = ext2_add_nondir(dentry, inode);
163 }
164 return err;
165}
166
167static int ext2_symlink (struct inode * dir, struct dentry * dentry,
168 const char * symname)
169{
170 struct super_block * sb = dir->i_sb;
171 int err = -ENAMETOOLONG;
172 unsigned l = strlen(symname)+1;
173 struct inode * inode;
174
175 if (l > sb->s_blocksize)
176 goto out;
177
178 dquot_initialize(dir);
179
180 inode = ext2_new_inode (dir, S_IFLNK | S_IRWXUGO, &dentry->d_name);
181 err = PTR_ERR(inode);
182 if (IS_ERR(inode))
183 goto out;
184
185 if (l > sizeof (EXT2_I(inode)->i_data)) {
186
187 inode->i_op = &ext2_symlink_inode_operations;
188 if (test_opt(inode->i_sb, NOBH))
189 inode->i_mapping->a_ops = &ext2_nobh_aops;
190 else
191 inode->i_mapping->a_ops = &ext2_aops;
192 err = page_symlink(inode, symname, l);
193 if (err)
194 goto out_fail;
195 } else {
196
197 inode->i_op = &ext2_fast_symlink_inode_operations;
198 memcpy((char*)(EXT2_I(inode)->i_data),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 = old_dentry->d_inode;
218 int err;
219
220 dquot_initialize(dir);
221
222 inode->i_ctime = CURRENT_TIME_SEC;
223 inode_inc_link_count(inode);
224 ihold(inode);
225
226 err = ext2_add_link(dentry, inode);
227 if (!err) {
228 d_instantiate(dentry, inode);
229 return 0;
230 }
231 inode_dec_link_count(inode);
232 iput(inode);
233 return err;
234}
235
236static int ext2_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
237{
238 struct inode * inode;
239 int err;
240
241 dquot_initialize(dir);
242
243 inode_inc_link_count(dir);
244
245 inode = ext2_new_inode(dir, S_IFDIR | mode, &dentry->d_name);
246 err = PTR_ERR(inode);
247 if (IS_ERR(inode))
248 goto out_dir;
249
250 inode->i_op = &ext2_dir_inode_operations;
251 inode->i_fop = &ext2_dir_operations;
252 if (test_opt(inode->i_sb, NOBH))
253 inode->i_mapping->a_ops = &ext2_nobh_aops;
254 else
255 inode->i_mapping->a_ops = &ext2_aops;
256
257 inode_inc_link_count(inode);
258
259 err = ext2_make_empty(inode, dir);
260 if (err)
261 goto out_fail;
262
263 err = ext2_add_link(dentry, inode);
264 if (err)
265 goto out_fail;
266
267 unlock_new_inode(inode);
268 d_instantiate(dentry, inode);
269out:
270 return err;
271
272out_fail:
273 inode_dec_link_count(inode);
274 inode_dec_link_count(inode);
275 unlock_new_inode(inode);
276 iput(inode);
277out_dir:
278 inode_dec_link_count(dir);
279 goto out;
280}
281
282static int ext2_unlink(struct inode * dir, struct dentry *dentry)
283{
284 struct inode * inode = dentry->d_inode;
285 struct ext2_dir_entry_2 * de;
286 struct page * page;
287 int err = -ENOENT;
288
289 dquot_initialize(dir);
290
291 de = ext2_find_entry (dir, &dentry->d_name, &page);
292 if (!de)
293 goto out;
294
295 err = ext2_delete_entry (de, page);
296 if (err)
297 goto out;
298
299 inode->i_ctime = dir->i_ctime;
300 inode_dec_link_count(inode);
301 err = 0;
302out:
303 return err;
304}
305
306static int ext2_rmdir (struct inode * dir, struct dentry *dentry)
307{
308 struct inode * inode = dentry->d_inode;
309 int err = -ENOTEMPTY;
310
311 if (ext2_empty_dir(inode)) {
312 err = ext2_unlink(dir, dentry);
313 if (!err) {
314 inode->i_size = 0;
315 inode_dec_link_count(inode);
316 inode_dec_link_count(dir);
317 }
318 }
319 return err;
320}
321
322static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry,
323 struct inode * new_dir, struct dentry * new_dentry )
324{
325 struct inode * old_inode = old_dentry->d_inode;
326 struct inode * new_inode = new_dentry->d_inode;
327 struct page * dir_page = NULL;
328 struct ext2_dir_entry_2 * dir_de = NULL;
329 struct page * old_page;
330 struct ext2_dir_entry_2 * old_de;
331 int err = -ENOENT;
332
333 dquot_initialize(old_dir);
334 dquot_initialize(new_dir);
335
336 old_de = ext2_find_entry (old_dir, &old_dentry->d_name, &old_page);
337 if (!old_de)
338 goto out;
339
340 if (S_ISDIR(old_inode->i_mode)) {
341 err = -EIO;
342 dir_de = ext2_dotdot(old_inode, &dir_page);
343 if (!dir_de)
344 goto out_old;
345 }
346
347 if (new_inode) {
348 struct page *new_page;
349 struct ext2_dir_entry_2 *new_de;
350
351 err = -ENOTEMPTY;
352 if (dir_de && !ext2_empty_dir (new_inode))
353 goto out_dir;
354
355 err = -ENOENT;
356 new_de = ext2_find_entry (new_dir, &new_dentry->d_name, &new_page);
357 if (!new_de)
358 goto out_dir;
359 ext2_set_link(new_dir, new_de, new_page, old_inode, 1);
360 new_inode->i_ctime = CURRENT_TIME_SEC;
361 if (dir_de)
362 drop_nlink(new_inode);
363 inode_dec_link_count(new_inode);
364 } else {
365 err = ext2_add_link(new_dentry, old_inode);
366 if (err)
367 goto out_dir;
368 if (dir_de)
369 inode_inc_link_count(new_dir);
370 }
371
372
373
374
375
376 old_inode->i_ctime = CURRENT_TIME_SEC;
377 mark_inode_dirty(old_inode);
378
379 ext2_delete_entry (old_de, old_page);
380
381 if (dir_de) {
382 if (old_dir != new_dir)
383 ext2_set_link(old_inode, dir_de, dir_page, new_dir, 0);
384 else {
385 kunmap(dir_page);
386 page_cache_release(dir_page);
387 }
388 inode_dec_link_count(old_dir);
389 }
390 return 0;
391
392
393out_dir:
394 if (dir_de) {
395 kunmap(dir_page);
396 page_cache_release(dir_page);
397 }
398out_old:
399 kunmap(old_page);
400 page_cache_release(old_page);
401out:
402 return err;
403}
404
405const struct inode_operations ext2_dir_inode_operations = {
406 .create = ext2_create,
407 .lookup = ext2_lookup,
408 .link = ext2_link,
409 .unlink = ext2_unlink,
410 .symlink = ext2_symlink,
411 .mkdir = ext2_mkdir,
412 .rmdir = ext2_rmdir,
413 .mknod = ext2_mknod,
414 .rename = ext2_rename,
415#ifdef CONFIG_EXT2_FS_XATTR
416 .setxattr = generic_setxattr,
417 .getxattr = generic_getxattr,
418 .listxattr = ext2_listxattr,
419 .removexattr = generic_removexattr,
420#endif
421 .setattr = ext2_setattr,
422 .get_acl = ext2_get_acl,
423 .set_acl = ext2_set_acl,
424 .tmpfile = ext2_tmpfile,
425};
426
427const struct inode_operations ext2_special_inode_operations = {
428#ifdef CONFIG_EXT2_FS_XATTR
429 .setxattr = generic_setxattr,
430 .getxattr = generic_getxattr,
431 .listxattr = ext2_listxattr,
432 .removexattr = generic_removexattr,
433#endif
434 .setattr = ext2_setattr,
435 .get_acl = ext2_get_acl,
436 .set_acl = ext2_set_acl,
437};
438
