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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 unlock_new_inode(inode);
55 return 0;
56 }
57 inode_dec_link_count(inode);
58 unlock_new_inode(inode);
59 iput(inode);
60 return err;
61}
62
63
64
65
66
67static struct dentry *
68nilfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
69{
70 struct inode *inode;
71 ino_t ino;
72
73 if (dentry->d_name.len > NILFS_NAME_LEN)
74 return ERR_PTR(-ENAMETOOLONG);
75
76 ino = nilfs_inode_by_name(dir, &dentry->d_name);
77 inode = ino ? nilfs_iget(dir->i_sb, NILFS_I(dir)->i_root, ino) : NULL;
78 return d_splice_alias(inode, dentry);
79}
80
81
82
83
84
85
86
87
88
89static int nilfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
90 bool excl)
91{
92 struct inode *inode;
93 struct nilfs_transaction_info ti;
94 int err;
95
96 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
97 if (err)
98 return err;
99 inode = nilfs_new_inode(dir, mode);
100 err = PTR_ERR(inode);
101 if (!IS_ERR(inode)) {
102 inode->i_op = &nilfs_file_inode_operations;
103 inode->i_fop = &nilfs_file_operations;
104 inode->i_mapping->a_ops = &nilfs_aops;
105 nilfs_mark_inode_dirty(inode);
106 err = nilfs_add_nondir(dentry, inode);
107 }
108 if (!err)
109 err = nilfs_transaction_commit(dir->i_sb);
110 else
111 nilfs_transaction_abort(dir->i_sb);
112
113 return err;
114}
115
116static int
117nilfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
118{
119 struct inode *inode;
120 struct nilfs_transaction_info ti;
121 int err;
122
123 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
124 if (err)
125 return err;
126 inode = nilfs_new_inode(dir, mode);
127 err = PTR_ERR(inode);
128 if (!IS_ERR(inode)) {
129 init_special_inode(inode, inode->i_mode, rdev);
130 nilfs_mark_inode_dirty(inode);
131 err = nilfs_add_nondir(dentry, inode);
132 }
133 if (!err)
134 err = nilfs_transaction_commit(dir->i_sb);
135 else
136 nilfs_transaction_abort(dir->i_sb);
137
138 return err;
139}
140
141static int nilfs_symlink(struct inode *dir, struct dentry *dentry,
142 const char *symname)
143{
144 struct nilfs_transaction_info ti;
145 struct super_block *sb = dir->i_sb;
146 unsigned l = strlen(symname)+1;
147 struct inode *inode;
148 int err;
149
150 if (l > sb->s_blocksize)
151 return -ENAMETOOLONG;
152
153 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
154 if (err)
155 return err;
156
157 inode = nilfs_new_inode(dir, S_IFLNK | S_IRWXUGO);
158 err = PTR_ERR(inode);
159 if (IS_ERR(inode))
160 goto out;
161
162
163 inode->i_op = &nilfs_symlink_inode_operations;
164 inode_nohighmem(inode);
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 unlock_new_inode(inode);
186 iput(inode);
187 goto out;
188}
189
190static int nilfs_link(struct dentry *old_dentry, struct inode *dir,
191 struct dentry *dentry)
192{
193 struct inode *inode = d_inode(old_dentry);
194 struct nilfs_transaction_info ti;
195 int err;
196
197 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
198 if (err)
199 return err;
200
201 inode->i_ctime = CURRENT_TIME;
202 inode_inc_link_count(inode);
203 ihold(inode);
204
205 err = nilfs_add_link(dentry, inode);
206 if (!err) {
207 d_instantiate(dentry, inode);
208 err = nilfs_transaction_commit(dir->i_sb);
209 } else {
210 inode_dec_link_count(inode);
211 iput(inode);
212 nilfs_transaction_abort(dir->i_sb);
213 }
214
215 return err;
216}
217
218static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
219{
220 struct inode *inode;
221 struct nilfs_transaction_info ti;
222 int err;
223
224 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
225 if (err)
226 return err;
227
228 inc_nlink(dir);
229
230 inode = nilfs_new_inode(dir, S_IFDIR | mode);
231 err = PTR_ERR(inode);
232 if (IS_ERR(inode))
233 goto out_dir;
234
235 inode->i_op = &nilfs_dir_inode_operations;
236 inode->i_fop = &nilfs_dir_operations;
237 inode->i_mapping->a_ops = &nilfs_aops;
238
239 inc_nlink(inode);
240
241 err = nilfs_make_empty(inode, dir);
242 if (err)
243 goto out_fail;
244
245 err = nilfs_add_link(dentry, inode);
246 if (err)
247 goto out_fail;
248
249 nilfs_mark_inode_dirty(inode);
250 d_instantiate(dentry, inode);
251 unlock_new_inode(inode);
252out:
253 if (!err)
254 err = nilfs_transaction_commit(dir->i_sb);
255 else
256 nilfs_transaction_abort(dir->i_sb);
257
258 return err;
259
260out_fail:
261 drop_nlink(inode);
262 drop_nlink(inode);
263 nilfs_mark_inode_dirty(inode);
264 unlock_new_inode(inode);
265 iput(inode);
266out_dir:
267 drop_nlink(dir);
268 nilfs_mark_inode_dirty(dir);
269 goto out;
270}
271
272static int nilfs_do_unlink(struct inode *dir, struct dentry *dentry)
273{
274 struct inode *inode;
275 struct nilfs_dir_entry *de;
276 struct page *page;
277 int err;
278
279 err = -ENOENT;
280 de = nilfs_find_entry(dir, &dentry->d_name, &page);
281 if (!de)
282 goto out;
283
284 inode = d_inode(dentry);
285 err = -EIO;
286 if (le64_to_cpu(de->inode) != inode->i_ino)
287 goto out;
288
289 if (!inode->i_nlink) {
290 nilfs_warning(inode->i_sb, __func__,
291 "deleting nonexistent file (%lu), %d\n",
292 inode->i_ino, inode->i_nlink);
293 set_nlink(inode, 1);
294 }
295 err = nilfs_delete_entry(de, page);
296 if (err)
297 goto out;
298
299 inode->i_ctime = dir->i_ctime;
300 drop_nlink(inode);
301 err = 0;
302out:
303 return err;
304}
305
306static int nilfs_unlink(struct inode *dir, struct dentry *dentry)
307{
308 struct nilfs_transaction_info ti;
309 int err;
310
311 err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
312 if (err)
313 return err;
314
315 err = nilfs_do_unlink(dir, dentry);
316
317 if (!err) {
318 nilfs_mark_inode_dirty(dir);
319 nilfs_mark_inode_dirty(d_inode(dentry));
320 err = nilfs_transaction_commit(dir->i_sb);
321 } else
322 nilfs_transaction_abort(dir->i_sb);
323
324 return err;
325}
326
327static int nilfs_rmdir(struct inode *dir, struct dentry *dentry)
328{
329 struct inode *inode = d_inode(dentry);
330 struct nilfs_transaction_info ti;
331 int err;
332
333 err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
334 if (err)
335 return err;
336
337 err = -ENOTEMPTY;
338 if (nilfs_empty_dir(inode)) {
339 err = nilfs_do_unlink(dir, dentry);
340 if (!err) {
341 inode->i_size = 0;
342 drop_nlink(inode);
343 nilfs_mark_inode_dirty(inode);
344 drop_nlink(dir);
345 nilfs_mark_inode_dirty(dir);
346 }
347 }
348 if (!err)
349 err = nilfs_transaction_commit(dir->i_sb);
350 else
351 nilfs_transaction_abort(dir->i_sb);
352
353 return err;
354}
355
356static int nilfs_rename(struct inode *old_dir, struct dentry *old_dentry,
357 struct inode *new_dir, struct dentry *new_dentry)
358{
359 struct inode *old_inode = d_inode(old_dentry);
360 struct inode *new_inode = d_inode(new_dentry);
361 struct page *dir_page = NULL;
362 struct nilfs_dir_entry *dir_de = NULL;
363 struct page *old_page;
364 struct nilfs_dir_entry *old_de;
365 struct nilfs_transaction_info ti;
366 int err;
367
368 err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
369 if (unlikely(err))
370 return err;
371
372 err = -ENOENT;
373 old_de = nilfs_find_entry(old_dir, &old_dentry->d_name, &old_page);
374 if (!old_de)
375 goto out;
376
377 if (S_ISDIR(old_inode->i_mode)) {
378 err = -EIO;
379 dir_de = nilfs_dotdot(old_inode, &dir_page);
380 if (!dir_de)
381 goto out_old;
382 }
383
384 if (new_inode) {
385 struct page *new_page;
386 struct nilfs_dir_entry *new_de;
387
388 err = -ENOTEMPTY;
389 if (dir_de && !nilfs_empty_dir(new_inode))
390 goto out_dir;
391
392 err = -ENOENT;
393 new_de = nilfs_find_entry(new_dir, &new_dentry->d_name, &new_page);
394 if (!new_de)
395 goto out_dir;
396 nilfs_set_link(new_dir, new_de, new_page, old_inode);
397 nilfs_mark_inode_dirty(new_dir);
398 new_inode->i_ctime = CURRENT_TIME;
399 if (dir_de)
400 drop_nlink(new_inode);
401 drop_nlink(new_inode);
402 nilfs_mark_inode_dirty(new_inode);
403 } else {
404 err = nilfs_add_link(new_dentry, old_inode);
405 if (err)
406 goto out_dir;
407 if (dir_de) {
408 inc_nlink(new_dir);
409 nilfs_mark_inode_dirty(new_dir);
410 }
411 }
412
413
414
415
416
417 old_inode->i_ctime = CURRENT_TIME;
418
419 nilfs_delete_entry(old_de, old_page);
420
421 if (dir_de) {
422 nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
423 drop_nlink(old_dir);
424 }
425 nilfs_mark_inode_dirty(old_dir);
426 nilfs_mark_inode_dirty(old_inode);
427
428 err = nilfs_transaction_commit(old_dir->i_sb);
429 return err;
430
431out_dir:
432 if (dir_de) {
433 kunmap(dir_page);
434 put_page(dir_page);
435 }
436out_old:
437 kunmap(old_page);
438 put_page(old_page);
439out:
440 nilfs_transaction_abort(old_dir->i_sb);
441 return err;
442}
443
444
445
446
447static struct dentry *nilfs_get_parent(struct dentry *child)
448{
449 unsigned long ino;
450 struct inode *inode;
451 struct qstr dotdot = QSTR_INIT("..", 2);
452 struct nilfs_root *root;
453
454 ino = nilfs_inode_by_name(d_inode(child), &dotdot);
455 if (!ino)
456 return ERR_PTR(-ENOENT);
457
458 root = NILFS_I(d_inode(child))->i_root;
459
460 inode = nilfs_iget(d_inode(child)->i_sb, root, ino);
461 if (IS_ERR(inode))
462 return ERR_CAST(inode);
463
464 return d_obtain_alias(inode);
465}
466
467static struct dentry *nilfs_get_dentry(struct super_block *sb, u64 cno,
468 u64 ino, u32 gen)
469{
470 struct nilfs_root *root;
471 struct inode *inode;
472
473 if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO)
474 return ERR_PTR(-ESTALE);
475
476 root = nilfs_lookup_root(sb->s_fs_info, cno);
477 if (!root)
478 return ERR_PTR(-ESTALE);
479
480 inode = nilfs_iget(sb, root, ino);
481 nilfs_put_root(root);
482
483 if (IS_ERR(inode))
484 return ERR_CAST(inode);
485 if (gen && inode->i_generation != gen) {
486 iput(inode);
487 return ERR_PTR(-ESTALE);
488 }
489 return d_obtain_alias(inode);
490}
491
492static struct dentry *nilfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
493 int fh_len, int fh_type)
494{
495 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
496
497 if (fh_len < NILFS_FID_SIZE_NON_CONNECTABLE ||
498 (fh_type != FILEID_NILFS_WITH_PARENT &&
499 fh_type != FILEID_NILFS_WITHOUT_PARENT))
500 return NULL;
501
502 return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen);
503}
504
505static struct dentry *nilfs_fh_to_parent(struct super_block *sb, struct fid *fh,
506 int fh_len, int fh_type)
507{
508 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
509
510 if (fh_len < NILFS_FID_SIZE_CONNECTABLE ||
511 fh_type != FILEID_NILFS_WITH_PARENT)
512 return NULL;
513
514 return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen);
515}
516
517static int nilfs_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
518 struct inode *parent)
519{
520 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
521 struct nilfs_root *root = NILFS_I(inode)->i_root;
522 int type;
523
524 if (parent && *lenp < NILFS_FID_SIZE_CONNECTABLE) {
525 *lenp = NILFS_FID_SIZE_CONNECTABLE;
526 return FILEID_INVALID;
527 }
528 if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE) {
529 *lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
530 return FILEID_INVALID;
531 }
532
533 fid->cno = root->cno;
534 fid->ino = inode->i_ino;
535 fid->gen = inode->i_generation;
536
537 if (parent) {
538 fid->parent_ino = parent->i_ino;
539 fid->parent_gen = parent->i_generation;
540 type = FILEID_NILFS_WITH_PARENT;
541 *lenp = NILFS_FID_SIZE_CONNECTABLE;
542 } else {
543 type = FILEID_NILFS_WITHOUT_PARENT;
544 *lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
545 }
546
547 return type;
548}
549
550const struct inode_operations nilfs_dir_inode_operations = {
551 .create = nilfs_create,
552 .lookup = nilfs_lookup,
553 .link = nilfs_link,
554 .unlink = nilfs_unlink,
555 .symlink = nilfs_symlink,
556 .mkdir = nilfs_mkdir,
557 .rmdir = nilfs_rmdir,
558 .mknod = nilfs_mknod,
559 .rename = nilfs_rename,
560 .setattr = nilfs_setattr,
561 .permission = nilfs_permission,
562 .fiemap = nilfs_fiemap,
563};
564
565const struct inode_operations nilfs_special_inode_operations = {
566 .setattr = nilfs_setattr,
567 .permission = nilfs_permission,
568};
569
570const struct inode_operations nilfs_symlink_inode_operations = {
571 .readlink = generic_readlink,
572 .get_link = page_get_link,
573 .permission = nilfs_permission,
574};
575
576const struct export_operations nilfs_export_ops = {
577 .encode_fh = nilfs_encode_fh,
578 .fh_to_dentry = nilfs_fh_to_dentry,
579 .fh_to_parent = nilfs_fh_to_parent,
580 .get_parent = nilfs_get_parent,
581};
582
