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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * namei.c - 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 inode *dir, struct dentry *dentry, umode_t mode,
76 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 inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
104{
105 struct inode *inode;
106 struct nilfs_transaction_info ti;
107 int err;
108
109 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
110 if (err)
111 return err;
112 inode = nilfs_new_inode(dir, mode);
113 err = PTR_ERR(inode);
114 if (!IS_ERR(inode)) {
115 init_special_inode(inode, inode->i_mode, rdev);
116 nilfs_mark_inode_dirty(inode);
117 err = nilfs_add_nondir(dentry, inode);
118 }
119 if (!err)
120 err = nilfs_transaction_commit(dir->i_sb);
121 else
122 nilfs_transaction_abort(dir->i_sb);
123
124 return err;
125}
126
127static int nilfs_symlink(struct inode *dir, struct dentry *dentry,
128 const char *symname)
129{
130 struct nilfs_transaction_info ti;
131 struct super_block *sb = dir->i_sb;
132 unsigned int l = strlen(symname) + 1;
133 struct inode *inode;
134 int err;
135
136 if (l > sb->s_blocksize)
137 return -ENAMETOOLONG;
138
139 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
140 if (err)
141 return err;
142
143 inode = nilfs_new_inode(dir, S_IFLNK | 0777);
144 err = PTR_ERR(inode);
145 if (IS_ERR(inode))
146 goto out;
147
148 /* slow symlink */
149 inode->i_op = &nilfs_symlink_inode_operations;
150 inode_nohighmem(inode);
151 inode->i_mapping->a_ops = &nilfs_aops;
152 err = page_symlink(inode, symname, l);
153 if (err)
154 goto out_fail;
155
156 /* mark_inode_dirty(inode); */
157 /* page_symlink() do this */
158
159 err = nilfs_add_nondir(dentry, inode);
160out:
161 if (!err)
162 err = nilfs_transaction_commit(dir->i_sb);
163 else
164 nilfs_transaction_abort(dir->i_sb);
165
166 return err;
167
168out_fail:
169 drop_nlink(inode);
170 nilfs_mark_inode_dirty(inode);
171 unlock_new_inode(inode);
172 iput(inode);
173 goto out;
174}
175
176static int nilfs_link(struct dentry *old_dentry, struct inode *dir,
177 struct dentry *dentry)
178{
179 struct inode *inode = d_inode(old_dentry);
180 struct nilfs_transaction_info ti;
181 int err;
182
183 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
184 if (err)
185 return err;
186
187 inode->i_ctime = current_time(inode);
188 inode_inc_link_count(inode);
189 ihold(inode);
190
191 err = nilfs_add_link(dentry, inode);
192 if (!err) {
193 d_instantiate(dentry, inode);
194 err = nilfs_transaction_commit(dir->i_sb);
195 } else {
196 inode_dec_link_count(inode);
197 iput(inode);
198 nilfs_transaction_abort(dir->i_sb);
199 }
200
201 return err;
202}
203
204static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
205{
206 struct inode *inode;
207 struct nilfs_transaction_info ti;
208 int err;
209
210 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
211 if (err)
212 return err;
213
214 inc_nlink(dir);
215
216 inode = nilfs_new_inode(dir, S_IFDIR | mode);
217 err = PTR_ERR(inode);
218 if (IS_ERR(inode))
219 goto out_dir;
220
221 inode->i_op = &nilfs_dir_inode_operations;
222 inode->i_fop = &nilfs_dir_operations;
223 inode->i_mapping->a_ops = &nilfs_aops;
224
225 inc_nlink(inode);
226
227 err = nilfs_make_empty(inode, dir);
228 if (err)
229 goto out_fail;
230
231 err = nilfs_add_link(dentry, inode);
232 if (err)
233 goto out_fail;
234
235 nilfs_mark_inode_dirty(inode);
236 d_instantiate_new(dentry, inode);
237out:
238 if (!err)
239 err = nilfs_transaction_commit(dir->i_sb);
240 else
241 nilfs_transaction_abort(dir->i_sb);
242
243 return err;
244
245out_fail:
246 drop_nlink(inode);
247 drop_nlink(inode);
248 nilfs_mark_inode_dirty(inode);
249 unlock_new_inode(inode);
250 iput(inode);
251out_dir:
252 drop_nlink(dir);
253 nilfs_mark_inode_dirty(dir);
254 goto out;
255}
256
257static int nilfs_do_unlink(struct inode *dir, struct dentry *dentry)
258{
259 struct inode *inode;
260 struct nilfs_dir_entry *de;
261 struct page *page;
262 int err;
263
264 err = -ENOENT;
265 de = nilfs_find_entry(dir, &dentry->d_name, &page);
266 if (!de)
267 goto out;
268
269 inode = d_inode(dentry);
270 err = -EIO;
271 if (le64_to_cpu(de->inode) != inode->i_ino)
272 goto out;
273
274 if (!inode->i_nlink) {
275 nilfs_msg(inode->i_sb, KERN_WARNING,
276 "deleting nonexistent file (ino=%lu), %d",
277 inode->i_ino, inode->i_nlink);
278 set_nlink(inode, 1);
279 }
280 err = nilfs_delete_entry(de, page);
281 if (err)
282 goto out;
283
284 inode->i_ctime = dir->i_ctime;
285 drop_nlink(inode);
286 err = 0;
287out:
288 return err;
289}
290
291static int nilfs_unlink(struct inode *dir, struct dentry *dentry)
292{
293 struct nilfs_transaction_info ti;
294 int err;
295
296 err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
297 if (err)
298 return err;
299
300 err = nilfs_do_unlink(dir, dentry);
301
302 if (!err) {
303 nilfs_mark_inode_dirty(dir);
304 nilfs_mark_inode_dirty(d_inode(dentry));
305 err = nilfs_transaction_commit(dir->i_sb);
306 } else
307 nilfs_transaction_abort(dir->i_sb);
308
309 return err;
310}
311
312static int nilfs_rmdir(struct inode *dir, struct dentry *dentry)
313{
314 struct inode *inode = d_inode(dentry);
315 struct nilfs_transaction_info ti;
316 int err;
317
318 err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
319 if (err)
320 return err;
321
322 err = -ENOTEMPTY;
323 if (nilfs_empty_dir(inode)) {
324 err = nilfs_do_unlink(dir, dentry);
325 if (!err) {
326 inode->i_size = 0;
327 drop_nlink(inode);
328 nilfs_mark_inode_dirty(inode);
329 drop_nlink(dir);
330 nilfs_mark_inode_dirty(dir);
331 }
332 }
333 if (!err)
334 err = nilfs_transaction_commit(dir->i_sb);
335 else
336 nilfs_transaction_abort(dir->i_sb);
337
338 return err;
339}
340
341static int nilfs_rename(struct inode *old_dir, struct dentry *old_dentry,
342 struct inode *new_dir, struct dentry *new_dentry,
343 unsigned int flags)
344{
345 struct inode *old_inode = d_inode(old_dentry);
346 struct inode *new_inode = d_inode(new_dentry);
347 struct page *dir_page = NULL;
348 struct nilfs_dir_entry *dir_de = NULL;
349 struct page *old_page;
350 struct nilfs_dir_entry *old_de;
351 struct nilfs_transaction_info ti;
352 int err;
353
354 if (flags & ~RENAME_NOREPLACE)
355 return -EINVAL;
356
357 err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
358 if (unlikely(err))
359 return err;
360
361 err = -ENOENT;
362 old_de = nilfs_find_entry(old_dir, &old_dentry->d_name, &old_page);
363 if (!old_de)
364 goto out;
365
366 if (S_ISDIR(old_inode->i_mode)) {
367 err = -EIO;
368 dir_de = nilfs_dotdot(old_inode, &dir_page);
369 if (!dir_de)
370 goto out_old;
371 }
372
373 if (new_inode) {
374 struct page *new_page;
375 struct nilfs_dir_entry *new_de;
376
377 err = -ENOTEMPTY;
378 if (dir_de && !nilfs_empty_dir(new_inode))
379 goto out_dir;
380
381 err = -ENOENT;
382 new_de = nilfs_find_entry(new_dir, &new_dentry->d_name, &new_page);
383 if (!new_de)
384 goto out_dir;
385 nilfs_set_link(new_dir, new_de, new_page, old_inode);
386 nilfs_mark_inode_dirty(new_dir);
387 new_inode->i_ctime = current_time(new_inode);
388 if (dir_de)
389 drop_nlink(new_inode);
390 drop_nlink(new_inode);
391 nilfs_mark_inode_dirty(new_inode);
392 } else {
393 err = nilfs_add_link(new_dentry, old_inode);
394 if (err)
395 goto out_dir;
396 if (dir_de) {
397 inc_nlink(new_dir);
398 nilfs_mark_inode_dirty(new_dir);
399 }
400 }
401
402 /*
403 * Like most other Unix systems, set the ctime for inodes on a
404 * rename.
405 */
406 old_inode->i_ctime = current_time(old_inode);
407
408 nilfs_delete_entry(old_de, old_page);
409
410 if (dir_de) {
411 nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
412 drop_nlink(old_dir);
413 }
414 nilfs_mark_inode_dirty(old_dir);
415 nilfs_mark_inode_dirty(old_inode);
416
417 err = nilfs_transaction_commit(old_dir->i_sb);
418 return err;
419
420out_dir:
421 if (dir_de) {
422 kunmap(dir_page);
423 put_page(dir_page);
424 }
425out_old:
426 kunmap(old_page);
427 put_page(old_page);
428out:
429 nilfs_transaction_abort(old_dir->i_sb);
430 return err;
431}
432
433/*
434 * Export operations
435 */
436static struct dentry *nilfs_get_parent(struct dentry *child)
437{
438 unsigned long ino;
439 struct inode *inode;
440 struct qstr dotdot = QSTR_INIT("..", 2);
441 struct nilfs_root *root;
442
443 ino = nilfs_inode_by_name(d_inode(child), &dotdot);
444 if (!ino)
445 return ERR_PTR(-ENOENT);
446
447 root = NILFS_I(d_inode(child))->i_root;
448
449 inode = nilfs_iget(child->d_sb, root, ino);
450 if (IS_ERR(inode))
451 return ERR_CAST(inode);
452
453 return d_obtain_alias(inode);
454}
455
456static struct dentry *nilfs_get_dentry(struct super_block *sb, u64 cno,
457 u64 ino, u32 gen)
458{
459 struct nilfs_root *root;
460 struct inode *inode;
461
462 if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO)
463 return ERR_PTR(-ESTALE);
464
465 root = nilfs_lookup_root(sb->s_fs_info, cno);
466 if (!root)
467 return ERR_PTR(-ESTALE);
468
469 inode = nilfs_iget(sb, root, ino);
470 nilfs_put_root(root);
471
472 if (IS_ERR(inode))
473 return ERR_CAST(inode);
474 if (gen && inode->i_generation != gen) {
475 iput(inode);
476 return ERR_PTR(-ESTALE);
477 }
478 return d_obtain_alias(inode);
479}
480
481static struct dentry *nilfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
482 int fh_len, int fh_type)
483{
484 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
485
486 if (fh_len < NILFS_FID_SIZE_NON_CONNECTABLE ||
487 (fh_type != FILEID_NILFS_WITH_PARENT &&
488 fh_type != FILEID_NILFS_WITHOUT_PARENT))
489 return NULL;
490
491 return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen);
492}
493
494static struct dentry *nilfs_fh_to_parent(struct super_block *sb, struct fid *fh,
495 int fh_len, int fh_type)
496{
497 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
498
499 if (fh_len < NILFS_FID_SIZE_CONNECTABLE ||
500 fh_type != FILEID_NILFS_WITH_PARENT)
501 return NULL;
502
503 return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen);
504}
505
506static int nilfs_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
507 struct inode *parent)
508{
509 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
510 struct nilfs_root *root = NILFS_I(inode)->i_root;
511 int type;
512
513 if (parent && *lenp < NILFS_FID_SIZE_CONNECTABLE) {
514 *lenp = NILFS_FID_SIZE_CONNECTABLE;
515 return FILEID_INVALID;
516 }
517 if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE) {
518 *lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
519 return FILEID_INVALID;
520 }
521
522 fid->cno = root->cno;
523 fid->ino = inode->i_ino;
524 fid->gen = inode->i_generation;
525
526 if (parent) {
527 fid->parent_ino = parent->i_ino;
528 fid->parent_gen = parent->i_generation;
529 type = FILEID_NILFS_WITH_PARENT;
530 *lenp = NILFS_FID_SIZE_CONNECTABLE;
531 } else {
532 type = FILEID_NILFS_WITHOUT_PARENT;
533 *lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
534 }
535
536 return type;
537}
538
539const struct inode_operations nilfs_dir_inode_operations = {
540 .create = nilfs_create,
541 .lookup = nilfs_lookup,
542 .link = nilfs_link,
543 .unlink = nilfs_unlink,
544 .symlink = nilfs_symlink,
545 .mkdir = nilfs_mkdir,
546 .rmdir = nilfs_rmdir,
547 .mknod = nilfs_mknod,
548 .rename = nilfs_rename,
549 .setattr = nilfs_setattr,
550 .permission = nilfs_permission,
551 .fiemap = nilfs_fiemap,
552};
553
554const struct inode_operations nilfs_special_inode_operations = {
555 .setattr = nilfs_setattr,
556 .permission = nilfs_permission,
557};
558
559const struct inode_operations nilfs_symlink_inode_operations = {
560 .get_link = page_get_link,
561 .permission = nilfs_permission,
562};
563
564const struct export_operations nilfs_export_ops = {
565 .encode_fh = nilfs_encode_fh,
566 .fh_to_dentry = nilfs_fh_to_dentry,
567 .fh_to_parent = nilfs_fh_to_parent,
568 .get_parent = nilfs_get_parent,
569};
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};