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36#include <linux/pagemap.h>
37#include "nilfs.h"
38#include "export.h"
39
40#define NILFS_FID_SIZE_NON_CONNECTABLE \
41 (offsetof(struct nilfs_fid, parent_gen) / 4)
42#define NILFS_FID_SIZE_CONNECTABLE (sizeof(struct nilfs_fid) / 4)
43
44static inline int nilfs_add_nondir(struct dentry *dentry, struct inode *inode)
45{
46 int err = nilfs_add_link(dentry, inode);
47
48 if (!err) {
49 d_instantiate(dentry, inode);
50 unlock_new_inode(inode);
51 return 0;
52 }
53 inode_dec_link_count(inode);
54 unlock_new_inode(inode);
55 iput(inode);
56 return err;
57}
58
59
60
61
62
63static struct dentry *
64nilfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
65{
66 struct inode *inode;
67 ino_t ino;
68
69 if (dentry->d_name.len > NILFS_NAME_LEN)
70 return ERR_PTR(-ENAMETOOLONG);
71
72 ino = nilfs_inode_by_name(dir, &dentry->d_name);
73 inode = ino ? nilfs_iget(dir->i_sb, NILFS_I(dir)->i_root, ino) : NULL;
74 return d_splice_alias(inode, dentry);
75}
76
77
78
79
80
81
82
83
84
85static int nilfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
86 bool excl)
87{
88 struct inode *inode;
89 struct nilfs_transaction_info ti;
90 int err;
91
92 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
93 if (err)
94 return err;
95 inode = nilfs_new_inode(dir, mode);
96 err = PTR_ERR(inode);
97 if (!IS_ERR(inode)) {
98 inode->i_op = &nilfs_file_inode_operations;
99 inode->i_fop = &nilfs_file_operations;
100 inode->i_mapping->a_ops = &nilfs_aops;
101 nilfs_mark_inode_dirty(inode);
102 err = nilfs_add_nondir(dentry, inode);
103 }
104 if (!err)
105 err = nilfs_transaction_commit(dir->i_sb);
106 else
107 nilfs_transaction_abort(dir->i_sb);
108
109 return err;
110}
111
112static int
113nilfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
114{
115 struct inode *inode;
116 struct nilfs_transaction_info ti;
117 int err;
118
119 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
120 if (err)
121 return err;
122 inode = nilfs_new_inode(dir, mode);
123 err = PTR_ERR(inode);
124 if (!IS_ERR(inode)) {
125 init_special_inode(inode, inode->i_mode, rdev);
126 nilfs_mark_inode_dirty(inode);
127 err = nilfs_add_nondir(dentry, inode);
128 }
129 if (!err)
130 err = nilfs_transaction_commit(dir->i_sb);
131 else
132 nilfs_transaction_abort(dir->i_sb);
133
134 return err;
135}
136
137static int nilfs_symlink(struct inode *dir, struct dentry *dentry,
138 const char *symname)
139{
140 struct nilfs_transaction_info ti;
141 struct super_block *sb = dir->i_sb;
142 unsigned int l = strlen(symname) + 1;
143 struct inode *inode;
144 int err;
145
146 if (l > sb->s_blocksize)
147 return -ENAMETOOLONG;
148
149 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
150 if (err)
151 return err;
152
153 inode = nilfs_new_inode(dir, S_IFLNK | S_IRWXUGO);
154 err = PTR_ERR(inode);
155 if (IS_ERR(inode))
156 goto out;
157
158
159 inode->i_op = &nilfs_symlink_inode_operations;
160 inode_nohighmem(inode);
161 inode->i_mapping->a_ops = &nilfs_aops;
162 err = page_symlink(inode, symname, l);
163 if (err)
164 goto out_fail;
165
166
167
168
169 err = nilfs_add_nondir(dentry, inode);
170out:
171 if (!err)
172 err = nilfs_transaction_commit(dir->i_sb);
173 else
174 nilfs_transaction_abort(dir->i_sb);
175
176 return err;
177
178out_fail:
179 drop_nlink(inode);
180 nilfs_mark_inode_dirty(inode);
181 unlock_new_inode(inode);
182 iput(inode);
183 goto out;
184}
185
186static int nilfs_link(struct dentry *old_dentry, struct inode *dir,
187 struct dentry *dentry)
188{
189 struct inode *inode = d_inode(old_dentry);
190 struct nilfs_transaction_info ti;
191 int err;
192
193 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
194 if (err)
195 return err;
196
197 inode->i_ctime = CURRENT_TIME;
198 inode_inc_link_count(inode);
199 ihold(inode);
200
201 err = nilfs_add_link(dentry, inode);
202 if (!err) {
203 d_instantiate(dentry, inode);
204 err = nilfs_transaction_commit(dir->i_sb);
205 } else {
206 inode_dec_link_count(inode);
207 iput(inode);
208 nilfs_transaction_abort(dir->i_sb);
209 }
210
211 return err;
212}
213
214static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
215{
216 struct inode *inode;
217 struct nilfs_transaction_info ti;
218 int err;
219
220 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
221 if (err)
222 return err;
223
224 inc_nlink(dir);
225
226 inode = nilfs_new_inode(dir, S_IFDIR | mode);
227 err = PTR_ERR(inode);
228 if (IS_ERR(inode))
229 goto out_dir;
230
231 inode->i_op = &nilfs_dir_inode_operations;
232 inode->i_fop = &nilfs_dir_operations;
233 inode->i_mapping->a_ops = &nilfs_aops;
234
235 inc_nlink(inode);
236
237 err = nilfs_make_empty(inode, dir);
238 if (err)
239 goto out_fail;
240
241 err = nilfs_add_link(dentry, inode);
242 if (err)
243 goto out_fail;
244
245 nilfs_mark_inode_dirty(inode);
246 d_instantiate(dentry, inode);
247 unlock_new_inode(inode);
248out:
249 if (!err)
250 err = nilfs_transaction_commit(dir->i_sb);
251 else
252 nilfs_transaction_abort(dir->i_sb);
253
254 return err;
255
256out_fail:
257 drop_nlink(inode);
258 drop_nlink(inode);
259 nilfs_mark_inode_dirty(inode);
260 unlock_new_inode(inode);
261 iput(inode);
262out_dir:
263 drop_nlink(dir);
264 nilfs_mark_inode_dirty(dir);
265 goto out;
266}
267
268static int nilfs_do_unlink(struct inode *dir, struct dentry *dentry)
269{
270 struct inode *inode;
271 struct nilfs_dir_entry *de;
272 struct page *page;
273 int err;
274
275 err = -ENOENT;
276 de = nilfs_find_entry(dir, &dentry->d_name, &page);
277 if (!de)
278 goto out;
279
280 inode = d_inode(dentry);
281 err = -EIO;
282 if (le64_to_cpu(de->inode) != inode->i_ino)
283 goto out;
284
285 if (!inode->i_nlink) {
286 nilfs_msg(inode->i_sb, KERN_WARNING,
287 "deleting nonexistent file (ino=%lu), %d",
288 inode->i_ino, inode->i_nlink);
289 set_nlink(inode, 1);
290 }
291 err = nilfs_delete_entry(de, page);
292 if (err)
293 goto out;
294
295 inode->i_ctime = dir->i_ctime;
296 drop_nlink(inode);
297 err = 0;
298out:
299 return err;
300}
301
302static int nilfs_unlink(struct inode *dir, struct dentry *dentry)
303{
304 struct nilfs_transaction_info ti;
305 int err;
306
307 err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
308 if (err)
309 return err;
310
311 err = nilfs_do_unlink(dir, dentry);
312
313 if (!err) {
314 nilfs_mark_inode_dirty(dir);
315 nilfs_mark_inode_dirty(d_inode(dentry));
316 err = nilfs_transaction_commit(dir->i_sb);
317 } else
318 nilfs_transaction_abort(dir->i_sb);
319
320 return err;
321}
322
323static int nilfs_rmdir(struct inode *dir, struct dentry *dentry)
324{
325 struct inode *inode = d_inode(dentry);
326 struct nilfs_transaction_info ti;
327 int err;
328
329 err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
330 if (err)
331 return err;
332
333 err = -ENOTEMPTY;
334 if (nilfs_empty_dir(inode)) {
335 err = nilfs_do_unlink(dir, dentry);
336 if (!err) {
337 inode->i_size = 0;
338 drop_nlink(inode);
339 nilfs_mark_inode_dirty(inode);
340 drop_nlink(dir);
341 nilfs_mark_inode_dirty(dir);
342 }
343 }
344 if (!err)
345 err = nilfs_transaction_commit(dir->i_sb);
346 else
347 nilfs_transaction_abort(dir->i_sb);
348
349 return err;
350}
351
352static int nilfs_rename(struct inode *old_dir, struct dentry *old_dentry,
353 struct inode *new_dir, struct dentry *new_dentry)
354{
355 struct inode *old_inode = d_inode(old_dentry);
356 struct inode *new_inode = d_inode(new_dentry);
357 struct page *dir_page = NULL;
358 struct nilfs_dir_entry *dir_de = NULL;
359 struct page *old_page;
360 struct nilfs_dir_entry *old_de;
361 struct nilfs_transaction_info ti;
362 int err;
363
364 err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
365 if (unlikely(err))
366 return err;
367
368 err = -ENOENT;
369 old_de = nilfs_find_entry(old_dir, &old_dentry->d_name, &old_page);
370 if (!old_de)
371 goto out;
372
373 if (S_ISDIR(old_inode->i_mode)) {
374 err = -EIO;
375 dir_de = nilfs_dotdot(old_inode, &dir_page);
376 if (!dir_de)
377 goto out_old;
378 }
379
380 if (new_inode) {
381 struct page *new_page;
382 struct nilfs_dir_entry *new_de;
383
384 err = -ENOTEMPTY;
385 if (dir_de && !nilfs_empty_dir(new_inode))
386 goto out_dir;
387
388 err = -ENOENT;
389 new_de = nilfs_find_entry(new_dir, &new_dentry->d_name, &new_page);
390 if (!new_de)
391 goto out_dir;
392 nilfs_set_link(new_dir, new_de, new_page, old_inode);
393 nilfs_mark_inode_dirty(new_dir);
394 new_inode->i_ctime = CURRENT_TIME;
395 if (dir_de)
396 drop_nlink(new_inode);
397 drop_nlink(new_inode);
398 nilfs_mark_inode_dirty(new_inode);
399 } else {
400 err = nilfs_add_link(new_dentry, old_inode);
401 if (err)
402 goto out_dir;
403 if (dir_de) {
404 inc_nlink(new_dir);
405 nilfs_mark_inode_dirty(new_dir);
406 }
407 }
408
409
410
411
412
413 old_inode->i_ctime = CURRENT_TIME;
414
415 nilfs_delete_entry(old_de, old_page);
416
417 if (dir_de) {
418 nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
419 drop_nlink(old_dir);
420 }
421 nilfs_mark_inode_dirty(old_dir);
422 nilfs_mark_inode_dirty(old_inode);
423
424 err = nilfs_transaction_commit(old_dir->i_sb);
425 return err;
426
427out_dir:
428 if (dir_de) {
429 kunmap(dir_page);
430 put_page(dir_page);
431 }
432out_old:
433 kunmap(old_page);
434 put_page(old_page);
435out:
436 nilfs_transaction_abort(old_dir->i_sb);
437 return err;
438}
439
440
441
442
443static struct dentry *nilfs_get_parent(struct dentry *child)
444{
445 unsigned long ino;
446 struct inode *inode;
447 struct qstr dotdot = QSTR_INIT("..", 2);
448 struct nilfs_root *root;
449
450 ino = nilfs_inode_by_name(d_inode(child), &dotdot);
451 if (!ino)
452 return ERR_PTR(-ENOENT);
453
454 root = NILFS_I(d_inode(child))->i_root;
455
456 inode = nilfs_iget(child->d_sb, root, ino);
457 if (IS_ERR(inode))
458 return ERR_CAST(inode);
459
460 return d_obtain_alias(inode);
461}
462
463static struct dentry *nilfs_get_dentry(struct super_block *sb, u64 cno,
464 u64 ino, u32 gen)
465{
466 struct nilfs_root *root;
467 struct inode *inode;
468
469 if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO)
470 return ERR_PTR(-ESTALE);
471
472 root = nilfs_lookup_root(sb->s_fs_info, cno);
473 if (!root)
474 return ERR_PTR(-ESTALE);
475
476 inode = nilfs_iget(sb, root, ino);
477 nilfs_put_root(root);
478
479 if (IS_ERR(inode))
480 return ERR_CAST(inode);
481 if (gen && inode->i_generation != gen) {
482 iput(inode);
483 return ERR_PTR(-ESTALE);
484 }
485 return d_obtain_alias(inode);
486}
487
488static struct dentry *nilfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
489 int fh_len, int fh_type)
490{
491 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
492
493 if (fh_len < NILFS_FID_SIZE_NON_CONNECTABLE ||
494 (fh_type != FILEID_NILFS_WITH_PARENT &&
495 fh_type != FILEID_NILFS_WITHOUT_PARENT))
496 return NULL;
497
498 return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen);
499}
500
501static struct dentry *nilfs_fh_to_parent(struct super_block *sb, struct fid *fh,
502 int fh_len, int fh_type)
503{
504 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
505
506 if (fh_len < NILFS_FID_SIZE_CONNECTABLE ||
507 fh_type != FILEID_NILFS_WITH_PARENT)
508 return NULL;
509
510 return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen);
511}
512
513static int nilfs_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
514 struct inode *parent)
515{
516 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
517 struct nilfs_root *root = NILFS_I(inode)->i_root;
518 int type;
519
520 if (parent && *lenp < NILFS_FID_SIZE_CONNECTABLE) {
521 *lenp = NILFS_FID_SIZE_CONNECTABLE;
522 return FILEID_INVALID;
523 }
524 if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE) {
525 *lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
526 return FILEID_INVALID;
527 }
528
529 fid->cno = root->cno;
530 fid->ino = inode->i_ino;
531 fid->gen = inode->i_generation;
532
533 if (parent) {
534 fid->parent_ino = parent->i_ino;
535 fid->parent_gen = parent->i_generation;
536 type = FILEID_NILFS_WITH_PARENT;
537 *lenp = NILFS_FID_SIZE_CONNECTABLE;
538 } else {
539 type = FILEID_NILFS_WITHOUT_PARENT;
540 *lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
541 }
542
543 return type;
544}
545
546const struct inode_operations nilfs_dir_inode_operations = {
547 .create = nilfs_create,
548 .lookup = nilfs_lookup,
549 .link = nilfs_link,
550 .unlink = nilfs_unlink,
551 .symlink = nilfs_symlink,
552 .mkdir = nilfs_mkdir,
553 .rmdir = nilfs_rmdir,
554 .mknod = nilfs_mknod,
555 .rename = nilfs_rename,
556 .setattr = nilfs_setattr,
557 .permission = nilfs_permission,
558 .fiemap = nilfs_fiemap,
559};
560
561const struct inode_operations nilfs_special_inode_operations = {
562 .setattr = nilfs_setattr,
563 .permission = nilfs_permission,
564};
565
566const struct inode_operations nilfs_symlink_inode_operations = {
567 .readlink = generic_readlink,
568 .get_link = page_get_link,
569 .permission = nilfs_permission,
570};
571
572const struct export_operations nilfs_export_ops = {
573 .encode_fh = nilfs_encode_fh,
574 .fh_to_dentry = nilfs_fh_to_dentry,
575 .fh_to_parent = nilfs_fh_to_parent,
576 .get_parent = nilfs_get_parent,
577};
578
