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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 discard_new_inode(inode);
49 return err;
50}
51
52
53
54
55
56static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags)
57{
58 struct inode * inode;
59 ino_t ino;
60
61 if (dentry->d_name.len > EXT2_NAME_LEN)
62 return ERR_PTR(-ENAMETOOLONG);
63
64 ino = ext2_inode_by_name(dir, &dentry->d_name);
65 inode = NULL;
66 if (ino) {
67 inode = ext2_iget(dir->i_sb, ino);
68 if (inode == ERR_PTR(-ESTALE)) {
69 ext2_error(dir->i_sb, __func__,
70 "deleted inode referenced: %lu",
71 (unsigned long) ino);
72 return ERR_PTR(-EIO);
73 }
74 }
75 return d_splice_alias(inode, dentry);
76}
77
78struct dentry *ext2_get_parent(struct dentry *child)
79{
80 struct qstr dotdot = QSTR_INIT("..", 2);
81 unsigned long ino = ext2_inode_by_name(d_inode(child), &dotdot);
82 if (!ino)
83 return ERR_PTR(-ENOENT);
84 return d_obtain_alias(ext2_iget(child->d_sb, ino));
85}
86
87
88
89
90
91
92
93
94
95static int ext2_create (struct inode * dir, struct dentry * dentry, umode_t mode, bool excl)
96{
97 struct inode *inode;
98 int err;
99
100 err = dquot_initialize(dir);
101 if (err)
102 return err;
103
104 inode = ext2_new_inode(dir, mode, &dentry->d_name);
105 if (IS_ERR(inode))
106 return PTR_ERR(inode);
107
108 ext2_set_file_ops(inode);
109 mark_inode_dirty(inode);
110 return ext2_add_nondir(dentry, inode);
111}
112
113static int ext2_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
114{
115 struct inode *inode = ext2_new_inode(dir, mode, NULL);
116 if (IS_ERR(inode))
117 return PTR_ERR(inode);
118
119 ext2_set_file_ops(inode);
120 mark_inode_dirty(inode);
121 d_tmpfile(dentry, inode);
122 unlock_new_inode(inode);
123 return 0;
124}
125
126static int ext2_mknod (struct inode * dir, struct dentry *dentry, umode_t mode, dev_t rdev)
127{
128 struct inode * inode;
129 int err;
130
131 err = dquot_initialize(dir);
132 if (err)
133 return err;
134
135 inode = ext2_new_inode (dir, mode, &dentry->d_name);
136 err = PTR_ERR(inode);
137 if (!IS_ERR(inode)) {
138 init_special_inode(inode, inode->i_mode, rdev);
139#ifdef CONFIG_EXT2_FS_XATTR
140 inode->i_op = &ext2_special_inode_operations;
141#endif
142 mark_inode_dirty(inode);
143 err = ext2_add_nondir(dentry, inode);
144 }
145 return err;
146}
147
148static int ext2_symlink (struct inode * dir, struct dentry * dentry,
149 const char * symname)
150{
151 struct super_block * sb = dir->i_sb;
152 int err = -ENAMETOOLONG;
153 unsigned l = strlen(symname)+1;
154 struct inode * inode;
155
156 if (l > sb->s_blocksize)
157 goto out;
158
159 err = dquot_initialize(dir);
160 if (err)
161 goto out;
162
163 inode = ext2_new_inode (dir, S_IFLNK | S_IRWXUGO, &dentry->d_name);
164 err = PTR_ERR(inode);
165 if (IS_ERR(inode))
166 goto out;
167
168 if (l > sizeof (EXT2_I(inode)->i_data)) {
169
170 inode->i_op = &ext2_symlink_inode_operations;
171 inode_nohighmem(inode);
172 if (test_opt(inode->i_sb, NOBH))
173 inode->i_mapping->a_ops = &ext2_nobh_aops;
174 else
175 inode->i_mapping->a_ops = &ext2_aops;
176 err = page_symlink(inode, symname, l);
177 if (err)
178 goto out_fail;
179 } else {
180
181 inode->i_op = &ext2_fast_symlink_inode_operations;
182 inode->i_link = (char*)EXT2_I(inode)->i_data;
183 memcpy(inode->i_link, symname, l);
184 inode->i_size = l-1;
185 }
186 mark_inode_dirty(inode);
187
188 err = ext2_add_nondir(dentry, inode);
189out:
190 return err;
191
192out_fail:
193 inode_dec_link_count(inode);
194 discard_new_inode(inode);
195 goto out;
196}
197
198static int ext2_link (struct dentry * old_dentry, struct inode * dir,
199 struct dentry *dentry)
200{
201 struct inode *inode = d_inode(old_dentry);
202 int err;
203
204 err = dquot_initialize(dir);
205 if (err)
206 return err;
207
208 inode->i_ctime = current_time(inode);
209 inode_inc_link_count(inode);
210 ihold(inode);
211
212 err = ext2_add_link(dentry, inode);
213 if (!err) {
214 d_instantiate(dentry, inode);
215 return 0;
216 }
217 inode_dec_link_count(inode);
218 iput(inode);
219 return err;
220}
221
222static int ext2_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
223{
224 struct inode * inode;
225 int err;
226
227 err = dquot_initialize(dir);
228 if (err)
229 return err;
230
231 inode_inc_link_count(dir);
232
233 inode = ext2_new_inode(dir, S_IFDIR | mode, &dentry->d_name);
234 err = PTR_ERR(inode);
235 if (IS_ERR(inode))
236 goto out_dir;
237
238 inode->i_op = &ext2_dir_inode_operations;
239 inode->i_fop = &ext2_dir_operations;
240 if (test_opt(inode->i_sb, NOBH))
241 inode->i_mapping->a_ops = &ext2_nobh_aops;
242 else
243 inode->i_mapping->a_ops = &ext2_aops;
244
245 inode_inc_link_count(inode);
246
247 err = ext2_make_empty(inode, dir);
248 if (err)
249 goto out_fail;
250
251 err = ext2_add_link(dentry, inode);
252 if (err)
253 goto out_fail;
254
255 d_instantiate_new(dentry, inode);
256out:
257 return err;
258
259out_fail:
260 inode_dec_link_count(inode);
261 inode_dec_link_count(inode);
262 discard_new_inode(inode);
263out_dir:
264 inode_dec_link_count(dir);
265 goto out;
266}
267
268static int ext2_unlink(struct inode * dir, struct dentry *dentry)
269{
270 struct inode * inode = d_inode(dentry);
271 struct ext2_dir_entry_2 * de;
272 struct page * page;
273 int err;
274
275 err = dquot_initialize(dir);
276 if (err)
277 goto out;
278
279 de = ext2_find_entry (dir, &dentry->d_name, &page);
280 if (!de) {
281 err = -ENOENT;
282 goto out;
283 }
284
285 err = ext2_delete_entry (de, page);
286 if (err)
287 goto out;
288
289 inode->i_ctime = dir->i_ctime;
290 inode_dec_link_count(inode);
291 err = 0;
292out:
293 return err;
294}
295
296static int ext2_rmdir (struct inode * dir, struct dentry *dentry)
297{
298 struct inode * inode = d_inode(dentry);
299 int err = -ENOTEMPTY;
300
301 if (ext2_empty_dir(inode)) {
302 err = ext2_unlink(dir, dentry);
303 if (!err) {
304 inode->i_size = 0;
305 inode_dec_link_count(inode);
306 inode_dec_link_count(dir);
307 }
308 }
309 return err;
310}
311
312static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry,
313 struct inode * new_dir, struct dentry * new_dentry,
314 unsigned int flags)
315{
316 struct inode * old_inode = d_inode(old_dentry);
317 struct inode * new_inode = d_inode(new_dentry);
318 struct page * dir_page = NULL;
319 struct ext2_dir_entry_2 * dir_de = NULL;
320 struct page * old_page;
321 struct ext2_dir_entry_2 * old_de;
322 int err;
323
324 if (flags & ~RENAME_NOREPLACE)
325 return -EINVAL;
326
327 err = dquot_initialize(old_dir);
328 if (err)
329 goto out;
330
331 err = dquot_initialize(new_dir);
332 if (err)
333 goto out;
334
335 old_de = ext2_find_entry (old_dir, &old_dentry->d_name, &old_page);
336 if (!old_de) {
337 err = -ENOENT;
338 goto out;
339 }
340
341 if (S_ISDIR(old_inode->i_mode)) {
342 err = -EIO;
343 dir_de = ext2_dotdot(old_inode, &dir_page);
344 if (!dir_de)
345 goto out_old;
346 }
347
348 if (new_inode) {
349 struct page *new_page;
350 struct ext2_dir_entry_2 *new_de;
351
352 err = -ENOTEMPTY;
353 if (dir_de && !ext2_empty_dir (new_inode))
354 goto out_dir;
355
356 err = -ENOENT;
357 new_de = ext2_find_entry (new_dir, &new_dentry->d_name, &new_page);
358 if (!new_de)
359 goto out_dir;
360 ext2_set_link(new_dir, new_de, new_page, old_inode, 1);
361 new_inode->i_ctime = current_time(new_inode);
362 if (dir_de)
363 drop_nlink(new_inode);
364 inode_dec_link_count(new_inode);
365 } else {
366 err = ext2_add_link(new_dentry, old_inode);
367 if (err)
368 goto out_dir;
369 if (dir_de)
370 inode_inc_link_count(new_dir);
371 }
372
373
374
375
376
377 old_inode->i_ctime = current_time(old_inode);
378 mark_inode_dirty(old_inode);
379
380 ext2_delete_entry (old_de, old_page);
381
382 if (dir_de) {
383 if (old_dir != new_dir)
384 ext2_set_link(old_inode, dir_de, dir_page, new_dir, 0);
385 else {
386 kunmap(dir_page);
387 put_page(dir_page);
388 }
389 inode_dec_link_count(old_dir);
390 }
391 return 0;
392
393
394out_dir:
395 if (dir_de) {
396 kunmap(dir_page);
397 put_page(dir_page);
398 }
399out_old:
400 kunmap(old_page);
401 put_page(old_page);
402out:
403 return err;
404}
405
406const struct inode_operations ext2_dir_inode_operations = {
407 .create = ext2_create,
408 .lookup = ext2_lookup,
409 .link = ext2_link,
410 .unlink = ext2_unlink,
411 .symlink = ext2_symlink,
412 .mkdir = ext2_mkdir,
413 .rmdir = ext2_rmdir,
414 .mknod = ext2_mknod,
415 .rename = ext2_rename,
416#ifdef CONFIG_EXT2_FS_XATTR
417 .listxattr = ext2_listxattr,
418#endif
419 .setattr = ext2_setattr,
420 .get_acl = ext2_get_acl,
421 .set_acl = ext2_set_acl,
422 .tmpfile = ext2_tmpfile,
423};
424
425const struct inode_operations ext2_special_inode_operations = {
426#ifdef CONFIG_EXT2_FS_XATTR
427 .listxattr = ext2_listxattr,
428#endif
429 .setattr = ext2_setattr,
430 .get_acl = ext2_get_acl,
431 .set_acl = ext2_set_acl,
432};
433
