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1/*
2 * namei.c - NILFS pathname lookup operations.
3 *
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * Modified for NILFS by Amagai Yoshiji and Ryusuke Konishi.
17 */
18/*
19 * linux/fs/ext2/namei.c
20 *
21 * Copyright (C) 1992, 1993, 1994, 1995
22 * Remy Card (card@masi.ibp.fr)
23 * Laboratoire MASI - Institut Blaise Pascal
24 * Universite Pierre et Marie Curie (Paris VI)
25 *
26 * from
27 *
28 * linux/fs/minix/namei.c
29 *
30 * Copyright (C) 1991, 1992 Linus Torvalds
31 *
32 * Big-endian to little-endian byte-swapping/bitmaps by
33 * David S. Miller (davem@caip.rutgers.edu), 1995
34 */
35
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_new(dentry, inode);
50 return 0;
51 }
52 inode_dec_link_count(inode);
53 unlock_new_inode(inode);
54 iput(inode);
55 return err;
56}
57
58/*
59 * Methods themselves.
60 */
61
62static struct dentry *
63nilfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
64{
65 struct inode *inode;
66 ino_t ino;
67
68 if (dentry->d_name.len > NILFS_NAME_LEN)
69 return ERR_PTR(-ENAMETOOLONG);
70
71 ino = nilfs_inode_by_name(dir, &dentry->d_name);
72 inode = ino ? nilfs_iget(dir->i_sb, NILFS_I(dir)->i_root, ino) : NULL;
73 return d_splice_alias(inode, dentry);
74}
75
76/*
77 * By the time this is called, we already have created
78 * the directory cache entry for the new file, but it
79 * is so far negative - it has no inode.
80 *
81 * If the create succeeds, we fill in the inode information
82 * with d_instantiate().
83 */
84static int nilfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
85 bool excl)
86{
87 struct inode *inode;
88 struct nilfs_transaction_info ti;
89 int err;
90
91 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
92 if (err)
93 return err;
94 inode = nilfs_new_inode(dir, mode);
95 err = PTR_ERR(inode);
96 if (!IS_ERR(inode)) {
97 inode->i_op = &nilfs_file_inode_operations;
98 inode->i_fop = &nilfs_file_operations;
99 inode->i_mapping->a_ops = &nilfs_aops;
100 nilfs_mark_inode_dirty(inode);
101 err = nilfs_add_nondir(dentry, inode);
102 }
103 if (!err)
104 err = nilfs_transaction_commit(dir->i_sb);
105 else
106 nilfs_transaction_abort(dir->i_sb);
107
108 return err;
109}
110
111static int
112nilfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
113{
114 struct inode *inode;
115 struct nilfs_transaction_info ti;
116 int err;
117
118 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
119 if (err)
120 return err;
121 inode = nilfs_new_inode(dir, mode);
122 err = PTR_ERR(inode);
123 if (!IS_ERR(inode)) {
124 init_special_inode(inode, inode->i_mode, rdev);
125 nilfs_mark_inode_dirty(inode);
126 err = nilfs_add_nondir(dentry, inode);
127 }
128 if (!err)
129 err = nilfs_transaction_commit(dir->i_sb);
130 else
131 nilfs_transaction_abort(dir->i_sb);
132
133 return err;
134}
135
136static int nilfs_symlink(struct inode *dir, struct dentry *dentry,
137 const char *symname)
138{
139 struct nilfs_transaction_info ti;
140 struct super_block *sb = dir->i_sb;
141 unsigned int l = strlen(symname) + 1;
142 struct inode *inode;
143 int err;
144
145 if (l > sb->s_blocksize)
146 return -ENAMETOOLONG;
147
148 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
149 if (err)
150 return err;
151
152 inode = nilfs_new_inode(dir, S_IFLNK | 0777);
153 err = PTR_ERR(inode);
154 if (IS_ERR(inode))
155 goto out;
156
157 /* slow symlink */
158 inode->i_op = &nilfs_symlink_inode_operations;
159 inode_nohighmem(inode);
160 inode->i_mapping->a_ops = &nilfs_aops;
161 err = page_symlink(inode, symname, l);
162 if (err)
163 goto out_fail;
164
165 /* mark_inode_dirty(inode); */
166 /* page_symlink() do this */
167
168 err = nilfs_add_nondir(dentry, inode);
169out:
170 if (!err)
171 err = nilfs_transaction_commit(dir->i_sb);
172 else
173 nilfs_transaction_abort(dir->i_sb);
174
175 return err;
176
177out_fail:
178 drop_nlink(inode);
179 nilfs_mark_inode_dirty(inode);
180 unlock_new_inode(inode);
181 iput(inode);
182 goto out;
183}
184
185static int nilfs_link(struct dentry *old_dentry, struct inode *dir,
186 struct dentry *dentry)
187{
188 struct inode *inode = d_inode(old_dentry);
189 struct nilfs_transaction_info ti;
190 int err;
191
192 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
193 if (err)
194 return err;
195
196 inode->i_ctime = current_time(inode);
197 inode_inc_link_count(inode);
198 ihold(inode);
199
200 err = nilfs_add_link(dentry, inode);
201 if (!err) {
202 d_instantiate(dentry, inode);
203 err = nilfs_transaction_commit(dir->i_sb);
204 } else {
205 inode_dec_link_count(inode);
206 iput(inode);
207 nilfs_transaction_abort(dir->i_sb);
208 }
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_new(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 unlock_new_inode(inode);
259 iput(inode);
260out_dir:
261 drop_nlink(dir);
262 nilfs_mark_inode_dirty(dir);
263 goto out;
264}
265
266static int nilfs_do_unlink(struct inode *dir, struct dentry *dentry)
267{
268 struct inode *inode;
269 struct nilfs_dir_entry *de;
270 struct page *page;
271 int err;
272
273 err = -ENOENT;
274 de = nilfs_find_entry(dir, &dentry->d_name, &page);
275 if (!de)
276 goto out;
277
278 inode = d_inode(dentry);
279 err = -EIO;
280 if (le64_to_cpu(de->inode) != inode->i_ino)
281 goto out;
282
283 if (!inode->i_nlink) {
284 nilfs_msg(inode->i_sb, KERN_WARNING,
285 "deleting nonexistent file (ino=%lu), %d",
286 inode->i_ino, inode->i_nlink);
287 set_nlink(inode, 1);
288 }
289 err = nilfs_delete_entry(de, page);
290 if (err)
291 goto out;
292
293 inode->i_ctime = dir->i_ctime;
294 drop_nlink(inode);
295 err = 0;
296out:
297 return err;
298}
299
300static int nilfs_unlink(struct inode *dir, struct dentry *dentry)
301{
302 struct nilfs_transaction_info ti;
303 int err;
304
305 err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
306 if (err)
307 return err;
308
309 err = nilfs_do_unlink(dir, dentry);
310
311 if (!err) {
312 nilfs_mark_inode_dirty(dir);
313 nilfs_mark_inode_dirty(d_inode(dentry));
314 err = nilfs_transaction_commit(dir->i_sb);
315 } else
316 nilfs_transaction_abort(dir->i_sb);
317
318 return err;
319}
320
321static int nilfs_rmdir(struct inode *dir, struct dentry *dentry)
322{
323 struct inode *inode = d_inode(dentry);
324 struct nilfs_transaction_info ti;
325 int err;
326
327 err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
328 if (err)
329 return err;
330
331 err = -ENOTEMPTY;
332 if (nilfs_empty_dir(inode)) {
333 err = nilfs_do_unlink(dir, dentry);
334 if (!err) {
335 inode->i_size = 0;
336 drop_nlink(inode);
337 nilfs_mark_inode_dirty(inode);
338 drop_nlink(dir);
339 nilfs_mark_inode_dirty(dir);
340 }
341 }
342 if (!err)
343 err = nilfs_transaction_commit(dir->i_sb);
344 else
345 nilfs_transaction_abort(dir->i_sb);
346
347 return err;
348}
349
350static int nilfs_rename(struct inode *old_dir, struct dentry *old_dentry,
351 struct inode *new_dir, struct dentry *new_dentry,
352 unsigned int flags)
353{
354 struct inode *old_inode = d_inode(old_dentry);
355 struct inode *new_inode = d_inode(new_dentry);
356 struct page *dir_page = NULL;
357 struct nilfs_dir_entry *dir_de = NULL;
358 struct page *old_page;
359 struct nilfs_dir_entry *old_de;
360 struct nilfs_transaction_info ti;
361 int err;
362
363 if (flags & ~RENAME_NOREPLACE)
364 return -EINVAL;
365
366 err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
367 if (unlikely(err))
368 return err;
369
370 err = -ENOENT;
371 old_de = nilfs_find_entry(old_dir, &old_dentry->d_name, &old_page);
372 if (!old_de)
373 goto out;
374
375 if (S_ISDIR(old_inode->i_mode)) {
376 err = -EIO;
377 dir_de = nilfs_dotdot(old_inode, &dir_page);
378 if (!dir_de)
379 goto out_old;
380 }
381
382 if (new_inode) {
383 struct page *new_page;
384 struct nilfs_dir_entry *new_de;
385
386 err = -ENOTEMPTY;
387 if (dir_de && !nilfs_empty_dir(new_inode))
388 goto out_dir;
389
390 err = -ENOENT;
391 new_de = nilfs_find_entry(new_dir, &new_dentry->d_name, &new_page);
392 if (!new_de)
393 goto out_dir;
394 nilfs_set_link(new_dir, new_de, new_page, old_inode);
395 nilfs_mark_inode_dirty(new_dir);
396 new_inode->i_ctime = current_time(new_inode);
397 if (dir_de)
398 drop_nlink(new_inode);
399 drop_nlink(new_inode);
400 nilfs_mark_inode_dirty(new_inode);
401 } else {
402 err = nilfs_add_link(new_dentry, old_inode);
403 if (err)
404 goto out_dir;
405 if (dir_de) {
406 inc_nlink(new_dir);
407 nilfs_mark_inode_dirty(new_dir);
408 }
409 }
410
411 /*
412 * Like most other Unix systems, set the ctime for inodes on a
413 * rename.
414 */
415 old_inode->i_ctime = current_time(old_inode);
416
417 nilfs_delete_entry(old_de, old_page);
418
419 if (dir_de) {
420 nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
421 drop_nlink(old_dir);
422 }
423 nilfs_mark_inode_dirty(old_dir);
424 nilfs_mark_inode_dirty(old_inode);
425
426 err = nilfs_transaction_commit(old_dir->i_sb);
427 return err;
428
429out_dir:
430 if (dir_de) {
431 kunmap(dir_page);
432 put_page(dir_page);
433 }
434out_old:
435 kunmap(old_page);
436 put_page(old_page);
437out:
438 nilfs_transaction_abort(old_dir->i_sb);
439 return err;
440}
441
442/*
443 * Export operations
444 */
445static struct dentry *nilfs_get_parent(struct dentry *child)
446{
447 unsigned long ino;
448 struct inode *inode;
449 struct qstr dotdot = QSTR_INIT("..", 2);
450 struct nilfs_root *root;
451
452 ino = nilfs_inode_by_name(d_inode(child), &dotdot);
453 if (!ino)
454 return ERR_PTR(-ENOENT);
455
456 root = NILFS_I(d_inode(child))->i_root;
457
458 inode = nilfs_iget(child->d_sb, root, ino);
459 if (IS_ERR(inode))
460 return ERR_CAST(inode);
461
462 return d_obtain_alias(inode);
463}
464
465static struct dentry *nilfs_get_dentry(struct super_block *sb, u64 cno,
466 u64 ino, u32 gen)
467{
468 struct nilfs_root *root;
469 struct inode *inode;
470
471 if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO)
472 return ERR_PTR(-ESTALE);
473
474 root = nilfs_lookup_root(sb->s_fs_info, cno);
475 if (!root)
476 return ERR_PTR(-ESTALE);
477
478 inode = nilfs_iget(sb, root, ino);
479 nilfs_put_root(root);
480
481 if (IS_ERR(inode))
482 return ERR_CAST(inode);
483 if (gen && inode->i_generation != gen) {
484 iput(inode);
485 return ERR_PTR(-ESTALE);
486 }
487 return d_obtain_alias(inode);
488}
489
490static struct dentry *nilfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
491 int fh_len, int fh_type)
492{
493 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
494
495 if (fh_len < NILFS_FID_SIZE_NON_CONNECTABLE ||
496 (fh_type != FILEID_NILFS_WITH_PARENT &&
497 fh_type != FILEID_NILFS_WITHOUT_PARENT))
498 return NULL;
499
500 return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen);
501}
502
503static struct dentry *nilfs_fh_to_parent(struct super_block *sb, struct fid *fh,
504 int fh_len, int fh_type)
505{
506 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
507
508 if (fh_len < NILFS_FID_SIZE_CONNECTABLE ||
509 fh_type != FILEID_NILFS_WITH_PARENT)
510 return NULL;
511
512 return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen);
513}
514
515static int nilfs_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
516 struct inode *parent)
517{
518 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
519 struct nilfs_root *root = NILFS_I(inode)->i_root;
520 int type;
521
522 if (parent && *lenp < NILFS_FID_SIZE_CONNECTABLE) {
523 *lenp = NILFS_FID_SIZE_CONNECTABLE;
524 return FILEID_INVALID;
525 }
526 if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE) {
527 *lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
528 return FILEID_INVALID;
529 }
530
531 fid->cno = root->cno;
532 fid->ino = inode->i_ino;
533 fid->gen = inode->i_generation;
534
535 if (parent) {
536 fid->parent_ino = parent->i_ino;
537 fid->parent_gen = parent->i_generation;
538 type = FILEID_NILFS_WITH_PARENT;
539 *lenp = NILFS_FID_SIZE_CONNECTABLE;
540 } else {
541 type = FILEID_NILFS_WITHOUT_PARENT;
542 *lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
543 }
544
545 return type;
546}
547
548const struct inode_operations nilfs_dir_inode_operations = {
549 .create = nilfs_create,
550 .lookup = nilfs_lookup,
551 .link = nilfs_link,
552 .unlink = nilfs_unlink,
553 .symlink = nilfs_symlink,
554 .mkdir = nilfs_mkdir,
555 .rmdir = nilfs_rmdir,
556 .mknod = nilfs_mknod,
557 .rename = nilfs_rename,
558 .setattr = nilfs_setattr,
559 .permission = nilfs_permission,
560 .fiemap = nilfs_fiemap,
561};
562
563const struct inode_operations nilfs_special_inode_operations = {
564 .setattr = nilfs_setattr,
565 .permission = nilfs_permission,
566};
567
568const struct inode_operations nilfs_symlink_inode_operations = {
569 .get_link = page_get_link,
570 .permission = nilfs_permission,
571};
572
573const struct export_operations nilfs_export_ops = {
574 .encode_fh = nilfs_encode_fh,
575 .fh_to_dentry = nilfs_fh_to_dentry,
576 .fh_to_parent = nilfs_fh_to_parent,
577 .get_parent = nilfs_get_parent,
578};
1/*
2 * namei.c - NILFS pathname lookup operations.
3 *
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Modified for NILFS by Amagai Yoshiji <amagai@osrg.net>,
21 * Ryusuke Konishi <ryusuke@osrg.net>
22 */
23/*
24 * linux/fs/ext2/namei.c
25 *
26 * Copyright (C) 1992, 1993, 1994, 1995
27 * Remy Card (card@masi.ibp.fr)
28 * Laboratoire MASI - Institut Blaise Pascal
29 * Universite Pierre et Marie Curie (Paris VI)
30 *
31 * from
32 *
33 * linux/fs/minix/namei.c
34 *
35 * Copyright (C) 1991, 1992 Linus Torvalds
36 *
37 * Big-endian to little-endian byte-swapping/bitmaps by
38 * David S. Miller (davem@caip.rutgers.edu), 1995
39 */
40
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 * Methods themselves.
63 */
64
65static struct dentry *
66nilfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
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 * By the time this is called, we already have created
81 * the directory cache entry for the new file, but it
82 * is so far negative - it has no inode.
83 *
84 * If the create succeeds, we fill in the inode information
85 * with d_instantiate().
86 */
87static int nilfs_create(struct inode *dir, struct dentry *dentry, int mode,
88 struct nameidata *nd)
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, int 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 /* slow symlink */
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 /* mark_inode_dirty(inode); */
171 /* page_symlink() do this */
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 if (inode->i_nlink >= NILFS_LINK_MAX)
197 return -EMLINK;
198
199 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
200 if (err)
201 return err;
202
203 inode->i_ctime = CURRENT_TIME;
204 inode_inc_link_count(inode);
205 ihold(inode);
206
207 err = nilfs_add_nondir(dentry, inode);
208 if (!err)
209 err = nilfs_transaction_commit(dir->i_sb);
210 else
211 nilfs_transaction_abort(dir->i_sb);
212
213 return err;
214}
215
216static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
217{
218 struct inode *inode;
219 struct nilfs_transaction_info ti;
220 int err;
221
222 if (dir->i_nlink >= NILFS_LINK_MAX)
223 return -EMLINK;
224
225 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
226 if (err)
227 return err;
228
229 inc_nlink(dir);
230
231 inode = nilfs_new_inode(dir, S_IFDIR | mode);
232 err = PTR_ERR(inode);
233 if (IS_ERR(inode))
234 goto out_dir;
235
236 inode->i_op = &nilfs_dir_inode_operations;
237 inode->i_fop = &nilfs_dir_operations;
238 inode->i_mapping->a_ops = &nilfs_aops;
239
240 inc_nlink(inode);
241
242 err = nilfs_make_empty(inode, dir);
243 if (err)
244 goto out_fail;
245
246 err = nilfs_add_link(dentry, inode);
247 if (err)
248 goto out_fail;
249
250 nilfs_mark_inode_dirty(inode);
251 d_instantiate(dentry, 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 iput(inode);
265out_dir:
266 drop_nlink(dir);
267 nilfs_mark_inode_dirty(dir);
268 goto out;
269}
270
271static int nilfs_do_unlink(struct inode *dir, struct dentry *dentry)
272{
273 struct inode *inode;
274 struct nilfs_dir_entry *de;
275 struct page *page;
276 int err;
277
278 err = -ENOENT;
279 de = nilfs_find_entry(dir, &dentry->d_name, &page);
280 if (!de)
281 goto out;
282
283 inode = dentry->d_inode;
284 err = -EIO;
285 if (le64_to_cpu(de->inode) != inode->i_ino)
286 goto out;
287
288 if (!inode->i_nlink) {
289 nilfs_warning(inode->i_sb, __func__,
290 "deleting nonexistent file (%lu), %d\n",
291 inode->i_ino, inode->i_nlink);
292 inode->i_nlink = 1;
293 }
294 err = nilfs_delete_entry(de, page);
295 if (err)
296 goto out;
297
298 inode->i_ctime = dir->i_ctime;
299 drop_nlink(inode);
300 err = 0;
301out:
302 return err;
303}
304
305static int nilfs_unlink(struct inode *dir, struct dentry *dentry)
306{
307 struct nilfs_transaction_info ti;
308 int err;
309
310 err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
311 if (err)
312 return err;
313
314 err = nilfs_do_unlink(dir, dentry);
315
316 if (!err) {
317 nilfs_mark_inode_dirty(dir);
318 nilfs_mark_inode_dirty(dentry->d_inode);
319 err = nilfs_transaction_commit(dir->i_sb);
320 } else
321 nilfs_transaction_abort(dir->i_sb);
322
323 return err;
324}
325
326static int nilfs_rmdir(struct inode *dir, struct dentry *dentry)
327{
328 struct inode *inode = dentry->d_inode;
329 struct nilfs_transaction_info ti;
330 int err;
331
332 err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
333 if (err)
334 return err;
335
336 err = -ENOTEMPTY;
337 if (nilfs_empty_dir(inode)) {
338 err = nilfs_do_unlink(dir, dentry);
339 if (!err) {
340 inode->i_size = 0;
341 drop_nlink(inode);
342 nilfs_mark_inode_dirty(inode);
343 drop_nlink(dir);
344 nilfs_mark_inode_dirty(dir);
345 }
346 }
347 if (!err)
348 err = nilfs_transaction_commit(dir->i_sb);
349 else
350 nilfs_transaction_abort(dir->i_sb);
351
352 return err;
353}
354
355static int nilfs_rename(struct inode *old_dir, struct dentry *old_dentry,
356 struct inode *new_dir, struct dentry *new_dentry)
357{
358 struct inode *old_inode = old_dentry->d_inode;
359 struct inode *new_inode = new_dentry->d_inode;
360 struct page *dir_page = NULL;
361 struct nilfs_dir_entry *dir_de = NULL;
362 struct page *old_page;
363 struct nilfs_dir_entry *old_de;
364 struct nilfs_transaction_info ti;
365 int err;
366
367 err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
368 if (unlikely(err))
369 return err;
370
371 err = -ENOENT;
372 old_de = nilfs_find_entry(old_dir, &old_dentry->d_name, &old_page);
373 if (!old_de)
374 goto out;
375
376 if (S_ISDIR(old_inode->i_mode)) {
377 err = -EIO;
378 dir_de = nilfs_dotdot(old_inode, &dir_page);
379 if (!dir_de)
380 goto out_old;
381 }
382
383 if (new_inode) {
384 struct page *new_page;
385 struct nilfs_dir_entry *new_de;
386
387 err = -ENOTEMPTY;
388 if (dir_de && !nilfs_empty_dir(new_inode))
389 goto out_dir;
390
391 err = -ENOENT;
392 new_de = nilfs_find_entry(new_dir, &new_dentry->d_name, &new_page);
393 if (!new_de)
394 goto out_dir;
395 nilfs_set_link(new_dir, new_de, new_page, old_inode);
396 nilfs_mark_inode_dirty(new_dir);
397 new_inode->i_ctime = CURRENT_TIME;
398 if (dir_de)
399 drop_nlink(new_inode);
400 drop_nlink(new_inode);
401 nilfs_mark_inode_dirty(new_inode);
402 } else {
403 if (dir_de) {
404 err = -EMLINK;
405 if (new_dir->i_nlink >= NILFS_LINK_MAX)
406 goto out_dir;
407 }
408 err = nilfs_add_link(new_dentry, old_inode);
409 if (err)
410 goto out_dir;
411 if (dir_de) {
412 inc_nlink(new_dir);
413 nilfs_mark_inode_dirty(new_dir);
414 }
415 }
416
417 /*
418 * Like most other Unix systems, set the ctime for inodes on a
419 * rename.
420 */
421 old_inode->i_ctime = CURRENT_TIME;
422
423 nilfs_delete_entry(old_de, old_page);
424
425 if (dir_de) {
426 nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
427 drop_nlink(old_dir);
428 }
429 nilfs_mark_inode_dirty(old_dir);
430 nilfs_mark_inode_dirty(old_inode);
431
432 err = nilfs_transaction_commit(old_dir->i_sb);
433 return err;
434
435out_dir:
436 if (dir_de) {
437 kunmap(dir_page);
438 page_cache_release(dir_page);
439 }
440out_old:
441 kunmap(old_page);
442 page_cache_release(old_page);
443out:
444 nilfs_transaction_abort(old_dir->i_sb);
445 return err;
446}
447
448/*
449 * Export operations
450 */
451static struct dentry *nilfs_get_parent(struct dentry *child)
452{
453 unsigned long ino;
454 struct inode *inode;
455 struct qstr dotdot = {.name = "..", .len = 2};
456 struct nilfs_root *root;
457
458 ino = nilfs_inode_by_name(child->d_inode, &dotdot);
459 if (!ino)
460 return ERR_PTR(-ENOENT);
461
462 root = NILFS_I(child->d_inode)->i_root;
463
464 inode = nilfs_iget(child->d_inode->i_sb, root, ino);
465 if (IS_ERR(inode))
466 return ERR_CAST(inode);
467
468 return d_obtain_alias(inode);
469}
470
471static struct dentry *nilfs_get_dentry(struct super_block *sb, u64 cno,
472 u64 ino, u32 gen)
473{
474 struct nilfs_root *root;
475 struct inode *inode;
476
477 if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO)
478 return ERR_PTR(-ESTALE);
479
480 root = nilfs_lookup_root(sb->s_fs_info, cno);
481 if (!root)
482 return ERR_PTR(-ESTALE);
483
484 inode = nilfs_iget(sb, root, ino);
485 nilfs_put_root(root);
486
487 if (IS_ERR(inode))
488 return ERR_CAST(inode);
489 if (gen && inode->i_generation != gen) {
490 iput(inode);
491 return ERR_PTR(-ESTALE);
492 }
493 return d_obtain_alias(inode);
494}
495
496static struct dentry *nilfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
497 int fh_len, int fh_type)
498{
499 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
500
501 if ((fh_len != NILFS_FID_SIZE_NON_CONNECTABLE &&
502 fh_len != NILFS_FID_SIZE_CONNECTABLE) ||
503 (fh_type != FILEID_NILFS_WITH_PARENT &&
504 fh_type != FILEID_NILFS_WITHOUT_PARENT))
505 return NULL;
506
507 return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen);
508}
509
510static struct dentry *nilfs_fh_to_parent(struct super_block *sb, struct fid *fh,
511 int fh_len, int fh_type)
512{
513 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
514
515 if (fh_len != NILFS_FID_SIZE_CONNECTABLE ||
516 fh_type != FILEID_NILFS_WITH_PARENT)
517 return NULL;
518
519 return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen);
520}
521
522static int nilfs_encode_fh(struct dentry *dentry, __u32 *fh, int *lenp,
523 int connectable)
524{
525 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
526 struct inode *inode = dentry->d_inode;
527 struct nilfs_root *root = NILFS_I(inode)->i_root;
528 int type;
529
530 if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE ||
531 (connectable && *lenp < NILFS_FID_SIZE_CONNECTABLE))
532 return 255;
533
534 fid->cno = root->cno;
535 fid->ino = inode->i_ino;
536 fid->gen = inode->i_generation;
537
538 if (connectable && !S_ISDIR(inode->i_mode)) {
539 struct inode *parent;
540
541 spin_lock(&dentry->d_lock);
542 parent = dentry->d_parent->d_inode;
543 fid->parent_ino = parent->i_ino;
544 fid->parent_gen = parent->i_generation;
545 spin_unlock(&dentry->d_lock);
546
547 type = FILEID_NILFS_WITH_PARENT;
548 *lenp = NILFS_FID_SIZE_CONNECTABLE;
549 } else {
550 type = FILEID_NILFS_WITHOUT_PARENT;
551 *lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
552 }
553
554 return type;
555}
556
557const struct inode_operations nilfs_dir_inode_operations = {
558 .create = nilfs_create,
559 .lookup = nilfs_lookup,
560 .link = nilfs_link,
561 .unlink = nilfs_unlink,
562 .symlink = nilfs_symlink,
563 .mkdir = nilfs_mkdir,
564 .rmdir = nilfs_rmdir,
565 .mknod = nilfs_mknod,
566 .rename = nilfs_rename,
567 .setattr = nilfs_setattr,
568 .permission = nilfs_permission,
569 .fiemap = nilfs_fiemap,
570};
571
572const struct inode_operations nilfs_special_inode_operations = {
573 .setattr = nilfs_setattr,
574 .permission = nilfs_permission,
575};
576
577const struct inode_operations nilfs_symlink_inode_operations = {
578 .readlink = generic_readlink,
579 .follow_link = page_follow_link_light,
580 .put_link = page_put_link,
581 .permission = nilfs_permission,
582};
583
584const struct export_operations nilfs_export_ops = {
585 .encode_fh = nilfs_encode_fh,
586 .fh_to_dentry = nilfs_fh_to_dentry,
587 .fh_to_parent = nilfs_fh_to_parent,
588 .get_parent = nilfs_get_parent,
589};