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34#include <linux/pagemap.h>
35#include <linux/quotaops.h>
36#include "ext2.h"
37#include "xattr.h"
38#include "acl.h"
39
40static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
41{
42 int err = ext2_add_link(dentry, inode);
43 if (!err) {
44 d_instantiate_new(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(child->d_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 ext2_set_file_ops(inode);
110 mark_inode_dirty(inode);
111 return ext2_add_nondir(dentry, inode);
112}
113
114static int ext2_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
115{
116 struct inode *inode = ext2_new_inode(dir, mode, NULL);
117 if (IS_ERR(inode))
118 return PTR_ERR(inode);
119
120 ext2_set_file_ops(inode);
121 mark_inode_dirty(inode);
122 d_tmpfile(dentry, inode);
123 unlock_new_inode(inode);
124 return 0;
125}
126
127static int ext2_mknod (struct inode * dir, struct dentry *dentry, umode_t mode, dev_t rdev)
128{
129 struct inode * inode;
130 int err;
131
132 err = dquot_initialize(dir);
133 if (err)
134 return err;
135
136 inode = ext2_new_inode (dir, mode, &dentry->d_name);
137 err = PTR_ERR(inode);
138 if (!IS_ERR(inode)) {
139 init_special_inode(inode, inode->i_mode, rdev);
140#ifdef CONFIG_EXT2_FS_XATTR
141 inode->i_op = &ext2_special_inode_operations;
142#endif
143 mark_inode_dirty(inode);
144 err = ext2_add_nondir(dentry, inode);
145 }
146 return err;
147}
148
149static int ext2_symlink (struct inode * dir, struct dentry * dentry,
150 const char * symname)
151{
152 struct super_block * sb = dir->i_sb;
153 int err = -ENAMETOOLONG;
154 unsigned l = strlen(symname)+1;
155 struct inode * inode;
156
157 if (l > sb->s_blocksize)
158 goto out;
159
160 err = dquot_initialize(dir);
161 if (err)
162 goto out;
163
164 inode = ext2_new_inode (dir, S_IFLNK | S_IRWXUGO, &dentry->d_name);
165 err = PTR_ERR(inode);
166 if (IS_ERR(inode))
167 goto out;
168
169 if (l > sizeof (EXT2_I(inode)->i_data)) {
170
171 inode->i_op = &ext2_symlink_inode_operations;
172 inode_nohighmem(inode);
173 if (test_opt(inode->i_sb, NOBH))
174 inode->i_mapping->a_ops = &ext2_nobh_aops;
175 else
176 inode->i_mapping->a_ops = &ext2_aops;
177 err = page_symlink(inode, symname, l);
178 if (err)
179 goto out_fail;
180 } else {
181
182 inode->i_op = &ext2_fast_symlink_inode_operations;
183 inode->i_link = (char*)EXT2_I(inode)->i_data;
184 memcpy(inode->i_link, symname, l);
185 inode->i_size = l-1;
186 }
187 mark_inode_dirty(inode);
188
189 err = ext2_add_nondir(dentry, inode);
190out:
191 return err;
192
193out_fail:
194 inode_dec_link_count(inode);
195 unlock_new_inode(inode);
196 iput (inode);
197 goto out;
198}
199
200static int ext2_link (struct dentry * old_dentry, struct inode * dir,
201 struct dentry *dentry)
202{
203 struct inode *inode = d_inode(old_dentry);
204 int err;
205
206 err = dquot_initialize(dir);
207 if (err)
208 return err;
209
210 inode->i_ctime = current_time(inode);
211 inode_inc_link_count(inode);
212 ihold(inode);
213
214 err = ext2_add_link(dentry, inode);
215 if (!err) {
216 d_instantiate(dentry, inode);
217 return 0;
218 }
219 inode_dec_link_count(inode);
220 iput(inode);
221 return err;
222}
223
224static int ext2_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
225{
226 struct inode * inode;
227 int err;
228
229 err = dquot_initialize(dir);
230 if (err)
231 return err;
232
233 inode_inc_link_count(dir);
234
235 inode = ext2_new_inode(dir, S_IFDIR | mode, &dentry->d_name);
236 err = PTR_ERR(inode);
237 if (IS_ERR(inode))
238 goto out_dir;
239
240 inode->i_op = &ext2_dir_inode_operations;
241 inode->i_fop = &ext2_dir_operations;
242 if (test_opt(inode->i_sb, NOBH))
243 inode->i_mapping->a_ops = &ext2_nobh_aops;
244 else
245 inode->i_mapping->a_ops = &ext2_aops;
246
247 inode_inc_link_count(inode);
248
249 err = ext2_make_empty(inode, dir);
250 if (err)
251 goto out_fail;
252
253 err = ext2_add_link(dentry, inode);
254 if (err)
255 goto out_fail;
256
257 d_instantiate_new(dentry, inode);
258out:
259 return err;
260
261out_fail:
262 inode_dec_link_count(inode);
263 inode_dec_link_count(inode);
264 unlock_new_inode(inode);
265 iput(inode);
266out_dir:
267 inode_dec_link_count(dir);
268 goto out;
269}
270
271static int ext2_unlink(struct inode * dir, struct dentry *dentry)
272{
273 struct inode * inode = d_inode(dentry);
274 struct ext2_dir_entry_2 * de;
275 struct page * page;
276 int err;
277
278 err = dquot_initialize(dir);
279 if (err)
280 goto out;
281
282 de = ext2_find_entry (dir, &dentry->d_name, &page);
283 if (!de) {
284 err = -ENOENT;
285 goto out;
286 }
287
288 err = ext2_delete_entry (de, page);
289 if (err)
290 goto out;
291
292 inode->i_ctime = dir->i_ctime;
293 inode_dec_link_count(inode);
294 err = 0;
295out:
296 return err;
297}
298
299static int ext2_rmdir (struct inode * dir, struct dentry *dentry)
300{
301 struct inode * inode = d_inode(dentry);
302 int err = -ENOTEMPTY;
303
304 if (ext2_empty_dir(inode)) {
305 err = ext2_unlink(dir, dentry);
306 if (!err) {
307 inode->i_size = 0;
308 inode_dec_link_count(inode);
309 inode_dec_link_count(dir);
310 }
311 }
312 return err;
313}
314
315static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry,
316 struct inode * new_dir, struct dentry * new_dentry,
317 unsigned int flags)
318{
319 struct inode * old_inode = d_inode(old_dentry);
320 struct inode * new_inode = d_inode(new_dentry);
321 struct page * dir_page = NULL;
322 struct ext2_dir_entry_2 * dir_de = NULL;
323 struct page * old_page;
324 struct ext2_dir_entry_2 * old_de;
325 int err;
326
327 if (flags & ~RENAME_NOREPLACE)
328 return -EINVAL;
329
330 err = dquot_initialize(old_dir);
331 if (err)
332 goto out;
333
334 err = dquot_initialize(new_dir);
335 if (err)
336 goto out;
337
338 old_de = ext2_find_entry (old_dir, &old_dentry->d_name, &old_page);
339 if (!old_de) {
340 err = -ENOENT;
341 goto out;
342 }
343
344 if (S_ISDIR(old_inode->i_mode)) {
345 err = -EIO;
346 dir_de = ext2_dotdot(old_inode, &dir_page);
347 if (!dir_de)
348 goto out_old;
349 }
350
351 if (new_inode) {
352 struct page *new_page;
353 struct ext2_dir_entry_2 *new_de;
354
355 err = -ENOTEMPTY;
356 if (dir_de && !ext2_empty_dir (new_inode))
357 goto out_dir;
358
359 err = -ENOENT;
360 new_de = ext2_find_entry (new_dir, &new_dentry->d_name, &new_page);
361 if (!new_de)
362 goto out_dir;
363 ext2_set_link(new_dir, new_de, new_page, old_inode, 1);
364 new_inode->i_ctime = current_time(new_inode);
365 if (dir_de)
366 drop_nlink(new_inode);
367 inode_dec_link_count(new_inode);
368 } else {
369 err = ext2_add_link(new_dentry, old_inode);
370 if (err)
371 goto out_dir;
372 if (dir_de)
373 inode_inc_link_count(new_dir);
374 }
375
376
377
378
379
380 old_inode->i_ctime = current_time(old_inode);
381 mark_inode_dirty(old_inode);
382
383 ext2_delete_entry (old_de, old_page);
384
385 if (dir_de) {
386 if (old_dir != new_dir)
387 ext2_set_link(old_inode, dir_de, dir_page, new_dir, 0);
388 else {
389 kunmap(dir_page);
390 put_page(dir_page);
391 }
392 inode_dec_link_count(old_dir);
393 }
394 return 0;
395
396
397out_dir:
398 if (dir_de) {
399 kunmap(dir_page);
400 put_page(dir_page);
401 }
402out_old:
403 kunmap(old_page);
404 put_page(old_page);
405out:
406 return err;
407}
408
409const struct inode_operations ext2_dir_inode_operations = {
410 .create = ext2_create,
411 .lookup = ext2_lookup,
412 .link = ext2_link,
413 .unlink = ext2_unlink,
414 .symlink = ext2_symlink,
415 .mkdir = ext2_mkdir,
416 .rmdir = ext2_rmdir,
417 .mknod = ext2_mknod,
418 .rename = ext2_rename,
419#ifdef CONFIG_EXT2_FS_XATTR
420 .listxattr = ext2_listxattr,
421#endif
422 .setattr = ext2_setattr,
423 .get_acl = ext2_get_acl,
424 .set_acl = ext2_set_acl,
425 .tmpfile = ext2_tmpfile,
426};
427
428const struct inode_operations ext2_special_inode_operations = {
429#ifdef CONFIG_EXT2_FS_XATTR
430 .listxattr = ext2_listxattr,
431#endif
432 .setattr = ext2_setattr,
433 .get_acl = ext2_get_acl,
434 .set_acl = ext2_set_acl,
435};
436
