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41#include <linux/pagemap.h>
42#include "nilfs.h"
43#include "export.h"
44
45#define NILFS_FID_SIZE_NON_CONNECTABLE \
46 (offsetof(struct nilfs_fid, parent_gen) / 4)
47#define NILFS_FID_SIZE_CONNECTABLE (sizeof(struct nilfs_fid) / 4)
48
49static inline int nilfs_add_nondir(struct dentry *dentry, struct inode *inode)
50{
51 int err = nilfs_add_link(dentry, inode);
52 if (!err) {
53 d_instantiate(dentry, inode);
54 return 0;
55 }
56 inode_dec_link_count(inode);
57 iput(inode);
58 return err;
59}
60
61
62
63
64
65static struct dentry *
66nilfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
67{
68 struct inode *inode;
69 ino_t ino;
70
71 if (dentry->d_name.len > NILFS_NAME_LEN)
72 return ERR_PTR(-ENAMETOOLONG);
73
74 ino = nilfs_inode_by_name(dir, &dentry->d_name);
75 inode = ino ? nilfs_iget(dir->i_sb, NILFS_I(dir)->i_root, ino) : NULL;
76 return d_splice_alias(inode, dentry);
77}
78
79
80
81
82
83
84
85
86
87static int nilfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
88 bool excl)
89{
90 struct inode *inode;
91 struct nilfs_transaction_info ti;
92 int err;
93
94 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
95 if (err)
96 return err;
97 inode = nilfs_new_inode(dir, mode);
98 err = PTR_ERR(inode);
99 if (!IS_ERR(inode)) {
100 inode->i_op = &nilfs_file_inode_operations;
101 inode->i_fop = &nilfs_file_operations;
102 inode->i_mapping->a_ops = &nilfs_aops;
103 nilfs_mark_inode_dirty(inode);
104 err = nilfs_add_nondir(dentry, inode);
105 }
106 if (!err)
107 err = nilfs_transaction_commit(dir->i_sb);
108 else
109 nilfs_transaction_abort(dir->i_sb);
110
111 return err;
112}
113
114static int
115nilfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
116{
117 struct inode *inode;
118 struct nilfs_transaction_info ti;
119 int err;
120
121 if (!new_valid_dev(rdev))
122 return -EINVAL;
123
124 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
125 if (err)
126 return err;
127 inode = nilfs_new_inode(dir, mode);
128 err = PTR_ERR(inode);
129 if (!IS_ERR(inode)) {
130 init_special_inode(inode, inode->i_mode, rdev);
131 nilfs_mark_inode_dirty(inode);
132 err = nilfs_add_nondir(dentry, inode);
133 }
134 if (!err)
135 err = nilfs_transaction_commit(dir->i_sb);
136 else
137 nilfs_transaction_abort(dir->i_sb);
138
139 return err;
140}
141
142static int nilfs_symlink(struct inode *dir, struct dentry *dentry,
143 const char *symname)
144{
145 struct nilfs_transaction_info ti;
146 struct super_block *sb = dir->i_sb;
147 unsigned l = strlen(symname)+1;
148 struct inode *inode;
149 int err;
150
151 if (l > sb->s_blocksize)
152 return -ENAMETOOLONG;
153
154 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
155 if (err)
156 return err;
157
158 inode = nilfs_new_inode(dir, S_IFLNK | S_IRWXUGO);
159 err = PTR_ERR(inode);
160 if (IS_ERR(inode))
161 goto out;
162
163
164 inode->i_op = &nilfs_symlink_inode_operations;
165 inode->i_mapping->a_ops = &nilfs_aops;
166 err = page_symlink(inode, symname, l);
167 if (err)
168 goto out_fail;
169
170
171
172
173 err = nilfs_add_nondir(dentry, inode);
174out:
175 if (!err)
176 err = nilfs_transaction_commit(dir->i_sb);
177 else
178 nilfs_transaction_abort(dir->i_sb);
179
180 return err;
181
182out_fail:
183 drop_nlink(inode);
184 nilfs_mark_inode_dirty(inode);
185 iput(inode);
186 goto out;
187}
188
189static int nilfs_link(struct dentry *old_dentry, struct inode *dir,
190 struct dentry *dentry)
191{
192 struct inode *inode = old_dentry->d_inode;
193 struct nilfs_transaction_info ti;
194 int err;
195
196 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
197 if (err)
198 return err;
199
200 inode->i_ctime = CURRENT_TIME;
201 inode_inc_link_count(inode);
202 ihold(inode);
203
204 err = nilfs_add_nondir(dentry, inode);
205 if (!err)
206 err = nilfs_transaction_commit(dir->i_sb);
207 else
208 nilfs_transaction_abort(dir->i_sb);
209
210 return err;
211}
212
213static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
214{
215 struct inode *inode;
216 struct nilfs_transaction_info ti;
217 int err;
218
219 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
220 if (err)
221 return err;
222
223 inc_nlink(dir);
224
225 inode = nilfs_new_inode(dir, S_IFDIR | mode);
226 err = PTR_ERR(inode);
227 if (IS_ERR(inode))
228 goto out_dir;
229
230 inode->i_op = &nilfs_dir_inode_operations;
231 inode->i_fop = &nilfs_dir_operations;
232 inode->i_mapping->a_ops = &nilfs_aops;
233
234 inc_nlink(inode);
235
236 err = nilfs_make_empty(inode, dir);
237 if (err)
238 goto out_fail;
239
240 err = nilfs_add_link(dentry, inode);
241 if (err)
242 goto out_fail;
243
244 nilfs_mark_inode_dirty(inode);
245 d_instantiate(dentry, inode);
246out:
247 if (!err)
248 err = nilfs_transaction_commit(dir->i_sb);
249 else
250 nilfs_transaction_abort(dir->i_sb);
251
252 return err;
253
254out_fail:
255 drop_nlink(inode);
256 drop_nlink(inode);
257 nilfs_mark_inode_dirty(inode);
258 iput(inode);
259out_dir:
260 drop_nlink(dir);
261 nilfs_mark_inode_dirty(dir);
262 goto out;
263}
264
265static int nilfs_do_unlink(struct inode *dir, struct dentry *dentry)
266{
267 struct inode *inode;
268 struct nilfs_dir_entry *de;
269 struct page *page;
270 int err;
271
272 err = -ENOENT;
273 de = nilfs_find_entry(dir, &dentry->d_name, &page);
274 if (!de)
275 goto out;
276
277 inode = dentry->d_inode;
278 err = -EIO;
279 if (le64_to_cpu(de->inode) != inode->i_ino)
280 goto out;
281
282 if (!inode->i_nlink) {
283 nilfs_warning(inode->i_sb, __func__,
284 "deleting nonexistent file (%lu), %d\n",
285 inode->i_ino, inode->i_nlink);
286 set_nlink(inode, 1);
287 }
288 err = nilfs_delete_entry(de, page);
289 if (err)
290 goto out;
291
292 inode->i_ctime = dir->i_ctime;
293 drop_nlink(inode);
294 err = 0;
295out:
296 return err;
297}
298
299static int nilfs_unlink(struct inode *dir, struct dentry *dentry)
300{
301 struct nilfs_transaction_info ti;
302 int err;
303
304 err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
305 if (err)
306 return err;
307
308 err = nilfs_do_unlink(dir, dentry);
309
310 if (!err) {
311 nilfs_mark_inode_dirty(dir);
312 nilfs_mark_inode_dirty(dentry->d_inode);
313 err = nilfs_transaction_commit(dir->i_sb);
314 } else
315 nilfs_transaction_abort(dir->i_sb);
316
317 return err;
318}
319
320static int nilfs_rmdir(struct inode *dir, struct dentry *dentry)
321{
322 struct inode *inode = dentry->d_inode;
323 struct nilfs_transaction_info ti;
324 int err;
325
326 err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
327 if (err)
328 return err;
329
330 err = -ENOTEMPTY;
331 if (nilfs_empty_dir(inode)) {
332 err = nilfs_do_unlink(dir, dentry);
333 if (!err) {
334 inode->i_size = 0;
335 drop_nlink(inode);
336 nilfs_mark_inode_dirty(inode);
337 drop_nlink(dir);
338 nilfs_mark_inode_dirty(dir);
339 }
340 }
341 if (!err)
342 err = nilfs_transaction_commit(dir->i_sb);
343 else
344 nilfs_transaction_abort(dir->i_sb);
345
346 return err;
347}
348
349static int nilfs_rename(struct inode *old_dir, struct dentry *old_dentry,
350 struct inode *new_dir, struct dentry *new_dentry)
351{
352 struct inode *old_inode = old_dentry->d_inode;
353 struct inode *new_inode = new_dentry->d_inode;
354 struct page *dir_page = NULL;
355 struct nilfs_dir_entry *dir_de = NULL;
356 struct page *old_page;
357 struct nilfs_dir_entry *old_de;
358 struct nilfs_transaction_info ti;
359 int err;
360
361 err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
362 if (unlikely(err))
363 return err;
364
365 err = -ENOENT;
366 old_de = nilfs_find_entry(old_dir, &old_dentry->d_name, &old_page);
367 if (!old_de)
368 goto out;
369
370 if (S_ISDIR(old_inode->i_mode)) {
371 err = -EIO;
372 dir_de = nilfs_dotdot(old_inode, &dir_page);
373 if (!dir_de)
374 goto out_old;
375 }
376
377 if (new_inode) {
378 struct page *new_page;
379 struct nilfs_dir_entry *new_de;
380
381 err = -ENOTEMPTY;
382 if (dir_de && !nilfs_empty_dir(new_inode))
383 goto out_dir;
384
385 err = -ENOENT;
386 new_de = nilfs_find_entry(new_dir, &new_dentry->d_name, &new_page);
387 if (!new_de)
388 goto out_dir;
389 nilfs_set_link(new_dir, new_de, new_page, old_inode);
390 nilfs_mark_inode_dirty(new_dir);
391 new_inode->i_ctime = CURRENT_TIME;
392 if (dir_de)
393 drop_nlink(new_inode);
394 drop_nlink(new_inode);
395 nilfs_mark_inode_dirty(new_inode);
396 } else {
397 err = nilfs_add_link(new_dentry, old_inode);
398 if (err)
399 goto out_dir;
400 if (dir_de) {
401 inc_nlink(new_dir);
402 nilfs_mark_inode_dirty(new_dir);
403 }
404 }
405
406
407
408
409
410 old_inode->i_ctime = CURRENT_TIME;
411
412 nilfs_delete_entry(old_de, old_page);
413
414 if (dir_de) {
415 nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
416 drop_nlink(old_dir);
417 }
418 nilfs_mark_inode_dirty(old_dir);
419 nilfs_mark_inode_dirty(old_inode);
420
421 err = nilfs_transaction_commit(old_dir->i_sb);
422 return err;
423
424out_dir:
425 if (dir_de) {
426 kunmap(dir_page);
427 page_cache_release(dir_page);
428 }
429out_old:
430 kunmap(old_page);
431 page_cache_release(old_page);
432out:
433 nilfs_transaction_abort(old_dir->i_sb);
434 return err;
435}
436
437
438
439
440static struct dentry *nilfs_get_parent(struct dentry *child)
441{
442 unsigned long ino;
443 struct inode *inode;
444 struct qstr dotdot = QSTR_INIT("..", 2);
445 struct nilfs_root *root;
446
447 ino = nilfs_inode_by_name(child->d_inode, &dotdot);
448 if (!ino)
449 return ERR_PTR(-ENOENT);
450
451 root = NILFS_I(child->d_inode)->i_root;
452
453 inode = nilfs_iget(child->d_inode->i_sb, root, ino);
454 if (IS_ERR(inode))
455 return ERR_CAST(inode);
456
457 return d_obtain_alias(inode);
458}
459
460static struct dentry *nilfs_get_dentry(struct super_block *sb, u64 cno,
461 u64 ino, u32 gen)
462{
463 struct nilfs_root *root;
464 struct inode *inode;
465
466 if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO)
467 return ERR_PTR(-ESTALE);
468
469 root = nilfs_lookup_root(sb->s_fs_info, cno);
470 if (!root)
471 return ERR_PTR(-ESTALE);
472
473 inode = nilfs_iget(sb, root, ino);
474 nilfs_put_root(root);
475
476 if (IS_ERR(inode))
477 return ERR_CAST(inode);
478 if (gen && inode->i_generation != gen) {
479 iput(inode);
480 return ERR_PTR(-ESTALE);
481 }
482 return d_obtain_alias(inode);
483}
484
485static struct dentry *nilfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
486 int fh_len, int fh_type)
487{
488 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
489
490 if ((fh_len != NILFS_FID_SIZE_NON_CONNECTABLE &&
491 fh_len != NILFS_FID_SIZE_CONNECTABLE) ||
492 (fh_type != FILEID_NILFS_WITH_PARENT &&
493 fh_type != FILEID_NILFS_WITHOUT_PARENT))
494 return NULL;
495
496 return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen);
497}
498
499static struct dentry *nilfs_fh_to_parent(struct super_block *sb, struct fid *fh,
500 int fh_len, int fh_type)
501{
502 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
503
504 if (fh_len != NILFS_FID_SIZE_CONNECTABLE ||
505 fh_type != FILEID_NILFS_WITH_PARENT)
506 return NULL;
507
508 return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen);
509}
510
511static int nilfs_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
512 struct inode *parent)
513{
514 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
515 struct nilfs_root *root = NILFS_I(inode)->i_root;
516 int type;
517
518 if (parent && *lenp < NILFS_FID_SIZE_CONNECTABLE) {
519 *lenp = NILFS_FID_SIZE_CONNECTABLE;
520 return FILEID_INVALID;
521 }
522 if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE) {
523 *lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
524 return FILEID_INVALID;
525 }
526
527 fid->cno = root->cno;
528 fid->ino = inode->i_ino;
529 fid->gen = inode->i_generation;
530
531 if (parent) {
532 fid->parent_ino = parent->i_ino;
533 fid->parent_gen = parent->i_generation;
534 type = FILEID_NILFS_WITH_PARENT;
535 *lenp = NILFS_FID_SIZE_CONNECTABLE;
536 } else {
537 type = FILEID_NILFS_WITHOUT_PARENT;
538 *lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
539 }
540
541 return type;
542}
543
544const struct inode_operations nilfs_dir_inode_operations = {
545 .create = nilfs_create,
546 .lookup = nilfs_lookup,
547 .link = nilfs_link,
548 .unlink = nilfs_unlink,
549 .symlink = nilfs_symlink,
550 .mkdir = nilfs_mkdir,
551 .rmdir = nilfs_rmdir,
552 .mknod = nilfs_mknod,
553 .rename = nilfs_rename,
554 .setattr = nilfs_setattr,
555 .permission = nilfs_permission,
556 .fiemap = nilfs_fiemap,
557};
558
559const struct inode_operations nilfs_special_inode_operations = {
560 .setattr = nilfs_setattr,
561 .permission = nilfs_permission,
562};
563
564const struct inode_operations nilfs_symlink_inode_operations = {
565 .readlink = generic_readlink,
566 .follow_link = page_follow_link_light,
567 .put_link = page_put_link,
568 .permission = nilfs_permission,
569};
570
571const struct export_operations nilfs_export_ops = {
572 .encode_fh = nilfs_encode_fh,
573 .fh_to_dentry = nilfs_fh_to_dentry,
574 .fh_to_parent = nilfs_fh_to_parent,
575 .get_parent = nilfs_get_parent,
576};
577
