Loading...
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * NILFS pathname lookup operations.
4 *
5 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
6 *
7 * Modified for NILFS by Amagai Yoshiji and Ryusuke Konishi.
8 */
9/*
10 * linux/fs/ext2/namei.c
11 *
12 * Copyright (C) 1992, 1993, 1994, 1995
13 * Remy Card (card@masi.ibp.fr)
14 * Laboratoire MASI - Institut Blaise Pascal
15 * Universite Pierre et Marie Curie (Paris VI)
16 *
17 * from
18 *
19 * linux/fs/minix/namei.c
20 *
21 * Copyright (C) 1991, 1992 Linus Torvalds
22 *
23 * Big-endian to little-endian byte-swapping/bitmaps by
24 * David S. Miller (davem@caip.rutgers.edu), 1995
25 */
26
27#include <linux/pagemap.h>
28#include "nilfs.h"
29#include "export.h"
30
31#define NILFS_FID_SIZE_NON_CONNECTABLE \
32 (offsetof(struct nilfs_fid, parent_gen) / 4)
33#define NILFS_FID_SIZE_CONNECTABLE (sizeof(struct nilfs_fid) / 4)
34
35static inline int nilfs_add_nondir(struct dentry *dentry, struct inode *inode)
36{
37 int err = nilfs_add_link(dentry, inode);
38
39 if (!err) {
40 d_instantiate_new(dentry, inode);
41 return 0;
42 }
43 inode_dec_link_count(inode);
44 unlock_new_inode(inode);
45 iput(inode);
46 return err;
47}
48
49/*
50 * Methods themselves.
51 */
52
53static struct dentry *
54nilfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
55{
56 struct inode *inode;
57 ino_t ino;
58
59 if (dentry->d_name.len > NILFS_NAME_LEN)
60 return ERR_PTR(-ENAMETOOLONG);
61
62 ino = nilfs_inode_by_name(dir, &dentry->d_name);
63 inode = ino ? nilfs_iget(dir->i_sb, NILFS_I(dir)->i_root, ino) : NULL;
64 return d_splice_alias(inode, dentry);
65}
66
67/*
68 * By the time this is called, we already have created
69 * the directory cache entry for the new file, but it
70 * is so far negative - it has no inode.
71 *
72 * If the create succeeds, we fill in the inode information
73 * with d_instantiate().
74 */
75static int nilfs_create(struct user_namespace *mnt_userns, struct inode *dir,
76 struct dentry *dentry, umode_t mode, bool excl)
77{
78 struct inode *inode;
79 struct nilfs_transaction_info ti;
80 int err;
81
82 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
83 if (err)
84 return err;
85 inode = nilfs_new_inode(dir, mode);
86 err = PTR_ERR(inode);
87 if (!IS_ERR(inode)) {
88 inode->i_op = &nilfs_file_inode_operations;
89 inode->i_fop = &nilfs_file_operations;
90 inode->i_mapping->a_ops = &nilfs_aops;
91 nilfs_mark_inode_dirty(inode);
92 err = nilfs_add_nondir(dentry, inode);
93 }
94 if (!err)
95 err = nilfs_transaction_commit(dir->i_sb);
96 else
97 nilfs_transaction_abort(dir->i_sb);
98
99 return err;
100}
101
102static int
103nilfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
104 struct dentry *dentry, umode_t mode, dev_t rdev)
105{
106 struct inode *inode;
107 struct nilfs_transaction_info ti;
108 int err;
109
110 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
111 if (err)
112 return err;
113 inode = nilfs_new_inode(dir, mode);
114 err = PTR_ERR(inode);
115 if (!IS_ERR(inode)) {
116 init_special_inode(inode, inode->i_mode, rdev);
117 nilfs_mark_inode_dirty(inode);
118 err = nilfs_add_nondir(dentry, inode);
119 }
120 if (!err)
121 err = nilfs_transaction_commit(dir->i_sb);
122 else
123 nilfs_transaction_abort(dir->i_sb);
124
125 return err;
126}
127
128static int nilfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
129 struct dentry *dentry, const char *symname)
130{
131 struct nilfs_transaction_info ti;
132 struct super_block *sb = dir->i_sb;
133 unsigned int l = strlen(symname) + 1;
134 struct inode *inode;
135 int err;
136
137 if (l > sb->s_blocksize)
138 return -ENAMETOOLONG;
139
140 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
141 if (err)
142 return err;
143
144 inode = nilfs_new_inode(dir, S_IFLNK | 0777);
145 err = PTR_ERR(inode);
146 if (IS_ERR(inode))
147 goto out;
148
149 /* slow symlink */
150 inode->i_op = &nilfs_symlink_inode_operations;
151 inode_nohighmem(inode);
152 inode->i_mapping->a_ops = &nilfs_aops;
153 err = page_symlink(inode, symname, l);
154 if (err)
155 goto out_fail;
156
157 /* mark_inode_dirty(inode); */
158 /* page_symlink() do this */
159
160 err = nilfs_add_nondir(dentry, inode);
161out:
162 if (!err)
163 err = nilfs_transaction_commit(dir->i_sb);
164 else
165 nilfs_transaction_abort(dir->i_sb);
166
167 return err;
168
169out_fail:
170 drop_nlink(inode);
171 nilfs_mark_inode_dirty(inode);
172 unlock_new_inode(inode);
173 iput(inode);
174 goto out;
175}
176
177static int nilfs_link(struct dentry *old_dentry, struct inode *dir,
178 struct dentry *dentry)
179{
180 struct inode *inode = d_inode(old_dentry);
181 struct nilfs_transaction_info ti;
182 int err;
183
184 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
185 if (err)
186 return err;
187
188 inode->i_ctime = current_time(inode);
189 inode_inc_link_count(inode);
190 ihold(inode);
191
192 err = nilfs_add_link(dentry, inode);
193 if (!err) {
194 d_instantiate(dentry, inode);
195 err = nilfs_transaction_commit(dir->i_sb);
196 } else {
197 inode_dec_link_count(inode);
198 iput(inode);
199 nilfs_transaction_abort(dir->i_sb);
200 }
201
202 return err;
203}
204
205static int nilfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
206 struct dentry *dentry, umode_t mode)
207{
208 struct inode *inode;
209 struct nilfs_transaction_info ti;
210 int err;
211
212 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
213 if (err)
214 return err;
215
216 inc_nlink(dir);
217
218 inode = nilfs_new_inode(dir, S_IFDIR | mode);
219 err = PTR_ERR(inode);
220 if (IS_ERR(inode))
221 goto out_dir;
222
223 inode->i_op = &nilfs_dir_inode_operations;
224 inode->i_fop = &nilfs_dir_operations;
225 inode->i_mapping->a_ops = &nilfs_aops;
226
227 inc_nlink(inode);
228
229 err = nilfs_make_empty(inode, dir);
230 if (err)
231 goto out_fail;
232
233 err = nilfs_add_link(dentry, inode);
234 if (err)
235 goto out_fail;
236
237 nilfs_mark_inode_dirty(inode);
238 d_instantiate_new(dentry, inode);
239out:
240 if (!err)
241 err = nilfs_transaction_commit(dir->i_sb);
242 else
243 nilfs_transaction_abort(dir->i_sb);
244
245 return err;
246
247out_fail:
248 drop_nlink(inode);
249 drop_nlink(inode);
250 nilfs_mark_inode_dirty(inode);
251 unlock_new_inode(inode);
252 iput(inode);
253out_dir:
254 drop_nlink(dir);
255 nilfs_mark_inode_dirty(dir);
256 goto out;
257}
258
259static int nilfs_do_unlink(struct inode *dir, struct dentry *dentry)
260{
261 struct inode *inode;
262 struct nilfs_dir_entry *de;
263 struct page *page;
264 int err;
265
266 err = -ENOENT;
267 de = nilfs_find_entry(dir, &dentry->d_name, &page);
268 if (!de)
269 goto out;
270
271 inode = d_inode(dentry);
272 err = -EIO;
273 if (le64_to_cpu(de->inode) != inode->i_ino)
274 goto out;
275
276 if (!inode->i_nlink) {
277 nilfs_warn(inode->i_sb,
278 "deleting nonexistent file (ino=%lu), %d",
279 inode->i_ino, inode->i_nlink);
280 set_nlink(inode, 1);
281 }
282 err = nilfs_delete_entry(de, page);
283 if (err)
284 goto out;
285
286 inode->i_ctime = dir->i_ctime;
287 drop_nlink(inode);
288 err = 0;
289out:
290 return err;
291}
292
293static int nilfs_unlink(struct inode *dir, struct dentry *dentry)
294{
295 struct nilfs_transaction_info ti;
296 int err;
297
298 err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
299 if (err)
300 return err;
301
302 err = nilfs_do_unlink(dir, dentry);
303
304 if (!err) {
305 nilfs_mark_inode_dirty(dir);
306 nilfs_mark_inode_dirty(d_inode(dentry));
307 err = nilfs_transaction_commit(dir->i_sb);
308 } else
309 nilfs_transaction_abort(dir->i_sb);
310
311 return err;
312}
313
314static int nilfs_rmdir(struct inode *dir, struct dentry *dentry)
315{
316 struct inode *inode = d_inode(dentry);
317 struct nilfs_transaction_info ti;
318 int err;
319
320 err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
321 if (err)
322 return err;
323
324 err = -ENOTEMPTY;
325 if (nilfs_empty_dir(inode)) {
326 err = nilfs_do_unlink(dir, dentry);
327 if (!err) {
328 inode->i_size = 0;
329 drop_nlink(inode);
330 nilfs_mark_inode_dirty(inode);
331 drop_nlink(dir);
332 nilfs_mark_inode_dirty(dir);
333 }
334 }
335 if (!err)
336 err = nilfs_transaction_commit(dir->i_sb);
337 else
338 nilfs_transaction_abort(dir->i_sb);
339
340 return err;
341}
342
343static int nilfs_rename(struct user_namespace *mnt_userns,
344 struct inode *old_dir, struct dentry *old_dentry,
345 struct inode *new_dir, struct dentry *new_dentry,
346 unsigned int flags)
347{
348 struct inode *old_inode = d_inode(old_dentry);
349 struct inode *new_inode = d_inode(new_dentry);
350 struct page *dir_page = NULL;
351 struct nilfs_dir_entry *dir_de = NULL;
352 struct page *old_page;
353 struct nilfs_dir_entry *old_de;
354 struct nilfs_transaction_info ti;
355 int err;
356
357 if (flags & ~RENAME_NOREPLACE)
358 return -EINVAL;
359
360 err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
361 if (unlikely(err))
362 return err;
363
364 err = -ENOENT;
365 old_de = nilfs_find_entry(old_dir, &old_dentry->d_name, &old_page);
366 if (!old_de)
367 goto out;
368
369 if (S_ISDIR(old_inode->i_mode)) {
370 err = -EIO;
371 dir_de = nilfs_dotdot(old_inode, &dir_page);
372 if (!dir_de)
373 goto out_old;
374 }
375
376 if (new_inode) {
377 struct page *new_page;
378 struct nilfs_dir_entry *new_de;
379
380 err = -ENOTEMPTY;
381 if (dir_de && !nilfs_empty_dir(new_inode))
382 goto out_dir;
383
384 err = -ENOENT;
385 new_de = nilfs_find_entry(new_dir, &new_dentry->d_name, &new_page);
386 if (!new_de)
387 goto out_dir;
388 nilfs_set_link(new_dir, new_de, new_page, old_inode);
389 nilfs_mark_inode_dirty(new_dir);
390 new_inode->i_ctime = current_time(new_inode);
391 if (dir_de)
392 drop_nlink(new_inode);
393 drop_nlink(new_inode);
394 nilfs_mark_inode_dirty(new_inode);
395 } else {
396 err = nilfs_add_link(new_dentry, old_inode);
397 if (err)
398 goto out_dir;
399 if (dir_de) {
400 inc_nlink(new_dir);
401 nilfs_mark_inode_dirty(new_dir);
402 }
403 }
404
405 /*
406 * Like most other Unix systems, set the ctime for inodes on a
407 * rename.
408 */
409 old_inode->i_ctime = current_time(old_inode);
410
411 nilfs_delete_entry(old_de, old_page);
412
413 if (dir_de) {
414 nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
415 drop_nlink(old_dir);
416 }
417 nilfs_mark_inode_dirty(old_dir);
418 nilfs_mark_inode_dirty(old_inode);
419
420 err = nilfs_transaction_commit(old_dir->i_sb);
421 return err;
422
423out_dir:
424 if (dir_de) {
425 kunmap(dir_page);
426 put_page(dir_page);
427 }
428out_old:
429 kunmap(old_page);
430 put_page(old_page);
431out:
432 nilfs_transaction_abort(old_dir->i_sb);
433 return err;
434}
435
436/*
437 * Export operations
438 */
439static struct dentry *nilfs_get_parent(struct dentry *child)
440{
441 unsigned long ino;
442 struct inode *inode;
443 struct nilfs_root *root;
444
445 ino = nilfs_inode_by_name(d_inode(child), &dotdot_name);
446 if (!ino)
447 return ERR_PTR(-ENOENT);
448
449 root = NILFS_I(d_inode(child))->i_root;
450
451 inode = nilfs_iget(child->d_sb, root, ino);
452 if (IS_ERR(inode))
453 return ERR_CAST(inode);
454
455 return d_obtain_alias(inode);
456}
457
458static struct dentry *nilfs_get_dentry(struct super_block *sb, u64 cno,
459 u64 ino, u32 gen)
460{
461 struct nilfs_root *root;
462 struct inode *inode;
463
464 if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO)
465 return ERR_PTR(-ESTALE);
466
467 root = nilfs_lookup_root(sb->s_fs_info, cno);
468 if (!root)
469 return ERR_PTR(-ESTALE);
470
471 inode = nilfs_iget(sb, root, ino);
472 nilfs_put_root(root);
473
474 if (IS_ERR(inode))
475 return ERR_CAST(inode);
476 if (gen && inode->i_generation != gen) {
477 iput(inode);
478 return ERR_PTR(-ESTALE);
479 }
480 return d_obtain_alias(inode);
481}
482
483static struct dentry *nilfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
484 int fh_len, int fh_type)
485{
486 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
487
488 if (fh_len < NILFS_FID_SIZE_NON_CONNECTABLE ||
489 (fh_type != FILEID_NILFS_WITH_PARENT &&
490 fh_type != FILEID_NILFS_WITHOUT_PARENT))
491 return NULL;
492
493 return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen);
494}
495
496static struct dentry *nilfs_fh_to_parent(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_CONNECTABLE ||
502 fh_type != FILEID_NILFS_WITH_PARENT)
503 return NULL;
504
505 return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen);
506}
507
508static int nilfs_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
509 struct inode *parent)
510{
511 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
512 struct nilfs_root *root = NILFS_I(inode)->i_root;
513 int type;
514
515 if (parent && *lenp < NILFS_FID_SIZE_CONNECTABLE) {
516 *lenp = NILFS_FID_SIZE_CONNECTABLE;
517 return FILEID_INVALID;
518 }
519 if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE) {
520 *lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
521 return FILEID_INVALID;
522 }
523
524 fid->cno = root->cno;
525 fid->ino = inode->i_ino;
526 fid->gen = inode->i_generation;
527
528 if (parent) {
529 fid->parent_ino = parent->i_ino;
530 fid->parent_gen = parent->i_generation;
531 type = FILEID_NILFS_WITH_PARENT;
532 *lenp = NILFS_FID_SIZE_CONNECTABLE;
533 } else {
534 type = FILEID_NILFS_WITHOUT_PARENT;
535 *lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
536 }
537
538 return type;
539}
540
541const struct inode_operations nilfs_dir_inode_operations = {
542 .create = nilfs_create,
543 .lookup = nilfs_lookup,
544 .link = nilfs_link,
545 .unlink = nilfs_unlink,
546 .symlink = nilfs_symlink,
547 .mkdir = nilfs_mkdir,
548 .rmdir = nilfs_rmdir,
549 .mknod = nilfs_mknod,
550 .rename = nilfs_rename,
551 .setattr = nilfs_setattr,
552 .permission = nilfs_permission,
553 .fiemap = nilfs_fiemap,
554 .fileattr_get = nilfs_fileattr_get,
555 .fileattr_set = nilfs_fileattr_set,
556};
557
558const struct inode_operations nilfs_special_inode_operations = {
559 .setattr = nilfs_setattr,
560 .permission = nilfs_permission,
561};
562
563const struct inode_operations nilfs_symlink_inode_operations = {
564 .get_link = page_get_link,
565 .permission = nilfs_permission,
566};
567
568const struct export_operations nilfs_export_ops = {
569 .encode_fh = nilfs_encode_fh,
570 .fh_to_dentry = nilfs_fh_to_dentry,
571 .fh_to_parent = nilfs_fh_to_parent,
572 .get_parent = nilfs_get_parent,
573};
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 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 * Methods themselves.
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 * By the time this is called, we already have created
83 * the directory cache entry for the new file, but it
84 * is so far negative - it has no inode.
85 *
86 * If the create succeeds, we fill in the inode information
87 * with d_instantiate().
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 /* slow symlink */
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 /* 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 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 * Like most other Unix systems, set the ctime for inodes on a
415 * rename.
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 * Export operations
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};