blob: 1d0c0b84c5a319e61e24f04f3d643f9284b6cee6 [file] [log] [blame]
Ryusuke Konishid2500652009-04-06 19:01:34 -07001/*
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"
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +090043#include "export.h"
Ryusuke Konishid2500652009-04-06 19:01:34 -070044
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +090045#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)
Ryusuke Konishid2500652009-04-06 19:01:34 -070048
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 *
Al Viro00cd8dd2012-06-10 17:13:09 -040066nilfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
Ryusuke Konishid2500652009-04-06 19:01:34 -070067{
68 struct inode *inode;
69 ino_t ino;
70
71 if (dentry->d_name.len > NILFS_NAME_LEN)
72 return ERR_PTR(-ENAMETOOLONG);
73
Al Viro03190032010-01-31 21:02:09 -050074 ino = nilfs_inode_by_name(dir, &dentry->d_name);
Al Viroa9049372011-07-08 21:20:11 -040075 inode = ino ? nilfs_iget(dir->i_sb, NILFS_I(dir)->i_root, ino) : NULL;
Ryusuke Konishid2500652009-04-06 19:01:34 -070076 return d_splice_alias(inode, dentry);
77}
78
Ryusuke Konishid2500652009-04-06 19:01:34 -070079/*
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 */
Al Viro4acdaf22011-07-26 01:42:34 -040087static int nilfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
Al Viroebfc3b42012-06-10 18:05:36 -040088 bool excl)
Ryusuke Konishid2500652009-04-06 19:01:34 -070089{
90 struct inode *inode;
91 struct nilfs_transaction_info ti;
Ryusuke Konishi47420c72009-04-06 19:01:45 -070092 int err;
Ryusuke Konishid2500652009-04-06 19:01:34 -070093
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;
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900103 nilfs_mark_inode_dirty(inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700104 err = nilfs_add_nondir(dentry, inode);
105 }
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700106 if (!err)
107 err = nilfs_transaction_commit(dir->i_sb);
108 else
109 nilfs_transaction_abort(dir->i_sb);
110
111 return err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700112}
113
114static int
Al Viro1a67aaf2011-07-26 01:52:52 -0400115nilfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
Ryusuke Konishid2500652009-04-06 19:01:34 -0700116{
117 struct inode *inode;
118 struct nilfs_transaction_info ti;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700119 int err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700120
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);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900131 nilfs_mark_inode_dirty(inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700132 err = nilfs_add_nondir(dentry, inode);
133 }
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700134 if (!err)
135 err = nilfs_transaction_commit(dir->i_sb);
136 else
137 nilfs_transaction_abort(dir->i_sb);
138
139 return err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700140}
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;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700149 int err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700150
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); */
Jiro SEKIBA9ca941d2009-11-27 19:41:06 +0900171 /* page_symlink() do this */
Ryusuke Konishid2500652009-04-06 19:01:34 -0700172
173 err = nilfs_add_nondir(dentry, inode);
174out:
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700175 if (!err)
176 err = nilfs_transaction_commit(dir->i_sb);
177 else
178 nilfs_transaction_abort(dir->i_sb);
179
180 return err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700181
182out_fail:
Jiro SEKIBA565de402009-11-27 19:41:08 +0900183 drop_nlink(inode);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900184 nilfs_mark_inode_dirty(inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700185 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;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700194 int err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700195
Ryusuke Konishid2500652009-04-06 19:01:34 -0700196 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
197 if (err)
198 return err;
199
200 inode->i_ctime = CURRENT_TIME;
201 inode_inc_link_count(inode);
Al Viro7de9c6ee2010-10-23 11:11:40 -0400202 ihold(inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700203
204 err = nilfs_add_nondir(dentry, inode);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700205 if (!err)
206 err = nilfs_transaction_commit(dir->i_sb);
207 else
208 nilfs_transaction_abort(dir->i_sb);
209
210 return err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700211}
212
Al Viro18bb1db2011-07-26 01:41:39 -0400213static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
Ryusuke Konishid2500652009-04-06 19:01:34 -0700214{
215 struct inode *inode;
216 struct nilfs_transaction_info ti;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700217 int err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700218
Ryusuke Konishid2500652009-04-06 19:01:34 -0700219 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
220 if (err)
221 return err;
222
Jiro SEKIBA565de402009-11-27 19:41:08 +0900223 inc_nlink(dir);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700224
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
Jiro SEKIBA565de402009-11-27 19:41:08 +0900234 inc_nlink(inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700235
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
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900244 nilfs_mark_inode_dirty(inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700245 d_instantiate(dentry, inode);
246out:
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700247 if (!err)
248 err = nilfs_transaction_commit(dir->i_sb);
249 else
250 nilfs_transaction_abort(dir->i_sb);
251
252 return err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700253
254out_fail:
Jiro SEKIBA565de402009-11-27 19:41:08 +0900255 drop_nlink(inode);
Jiro SEKIBA565de402009-11-27 19:41:08 +0900256 drop_nlink(inode);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900257 nilfs_mark_inode_dirty(inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700258 iput(inode);
259out_dir:
Jiro SEKIBA565de402009-11-27 19:41:08 +0900260 drop_nlink(dir);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900261 nilfs_mark_inode_dirty(dir);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700262 goto out;
263}
264
Jiro SEKIBA4cd76c32009-11-27 19:41:10 +0900265static int nilfs_do_unlink(struct inode *dir, struct dentry *dentry)
Ryusuke Konishid2500652009-04-06 19:01:34 -0700266{
267 struct inode *inode;
268 struct nilfs_dir_entry *de;
269 struct page *page;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700270 int err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700271
Ryusuke Konishid2500652009-04-06 19:01:34 -0700272 err = -ENOENT;
Al Viro03190032010-01-31 21:02:09 -0500273 de = nilfs_find_entry(dir, &dentry->d_name, &page);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700274 if (!de)
275 goto out;
276
277 inode = dentry->d_inode;
278 err = -EIO;
279 if (le64_to_cpu(de->inode) != inode->i_ino)
280 goto out;
281
282 if (!inode->i_nlink) {
283 nilfs_warning(inode->i_sb, __func__,
284 "deleting nonexistent file (%lu), %d\n",
285 inode->i_ino, inode->i_nlink);
Miklos Szeredibfe86842011-10-28 14:13:29 +0200286 set_nlink(inode, 1);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700287 }
288 err = nilfs_delete_entry(de, page);
289 if (err)
290 goto out;
291
292 inode->i_ctime = dir->i_ctime;
Jiro SEKIBA565de402009-11-27 19:41:08 +0900293 drop_nlink(inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700294 err = 0;
295out:
Jiro SEKIBA4cd76c32009-11-27 19:41:10 +0900296 return err;
297}
298
299static int nilfs_unlink(struct inode *dir, struct dentry *dentry)
300{
301 struct nilfs_transaction_info ti;
302 int err;
303
304 err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
305 if (err)
306 return err;
307
308 err = nilfs_do_unlink(dir, dentry);
309
310 if (!err) {
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900311 nilfs_mark_inode_dirty(dir);
312 nilfs_mark_inode_dirty(dentry->d_inode);
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700313 err = nilfs_transaction_commit(dir->i_sb);
Jiro SEKIBA4cd76c32009-11-27 19:41:10 +0900314 } else
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700315 nilfs_transaction_abort(dir->i_sb);
316
317 return err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700318}
319
320static int nilfs_rmdir(struct inode *dir, struct dentry *dentry)
321{
322 struct inode *inode = dentry->d_inode;
323 struct nilfs_transaction_info ti;
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700324 int err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700325
326 err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
327 if (err)
328 return err;
329
330 err = -ENOTEMPTY;
331 if (nilfs_empty_dir(inode)) {
Jiro SEKIBA4cd76c32009-11-27 19:41:10 +0900332 err = nilfs_do_unlink(dir, dentry);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700333 if (!err) {
334 inode->i_size = 0;
Jiro SEKIBA565de402009-11-27 19:41:08 +0900335 drop_nlink(inode);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900336 nilfs_mark_inode_dirty(inode);
Jiro SEKIBA565de402009-11-27 19:41:08 +0900337 drop_nlink(dir);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900338 nilfs_mark_inode_dirty(dir);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700339 }
340 }
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700341 if (!err)
342 err = nilfs_transaction_commit(dir->i_sb);
343 else
344 nilfs_transaction_abort(dir->i_sb);
345
346 return err;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700347}
348
349static int nilfs_rename(struct inode *old_dir, struct dentry *old_dentry,
350 struct inode *new_dir, struct dentry *new_dentry)
351{
352 struct inode *old_inode = old_dentry->d_inode;
353 struct inode *new_inode = new_dentry->d_inode;
354 struct page *dir_page = NULL;
355 struct nilfs_dir_entry *dir_de = NULL;
356 struct page *old_page;
357 struct nilfs_dir_entry *old_de;
358 struct nilfs_transaction_info ti;
359 int err;
360
361 err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
362 if (unlikely(err))
363 return err;
364
365 err = -ENOENT;
Al Viro03190032010-01-31 21:02:09 -0500366 old_de = nilfs_find_entry(old_dir, &old_dentry->d_name, &old_page);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700367 if (!old_de)
368 goto out;
369
370 if (S_ISDIR(old_inode->i_mode)) {
371 err = -EIO;
372 dir_de = nilfs_dotdot(old_inode, &dir_page);
373 if (!dir_de)
374 goto out_old;
375 }
376
377 if (new_inode) {
378 struct page *new_page;
379 struct nilfs_dir_entry *new_de;
380
381 err = -ENOTEMPTY;
382 if (dir_de && !nilfs_empty_dir(new_inode))
383 goto out_dir;
384
385 err = -ENOENT;
Al Viro03190032010-01-31 21:02:09 -0500386 new_de = nilfs_find_entry(new_dir, &new_dentry->d_name, &new_page);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700387 if (!new_de)
388 goto out_dir;
Ryusuke Konishid2500652009-04-06 19:01:34 -0700389 nilfs_set_link(new_dir, new_de, new_page, old_inode);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900390 nilfs_mark_inode_dirty(new_dir);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700391 new_inode->i_ctime = CURRENT_TIME;
392 if (dir_de)
393 drop_nlink(new_inode);
Jiro SEKIBA565de402009-11-27 19:41:08 +0900394 drop_nlink(new_inode);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900395 nilfs_mark_inode_dirty(new_inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700396 } else {
Ryusuke Konishid2500652009-04-06 19:01:34 -0700397 err = nilfs_add_link(new_dentry, old_inode);
Al Viro30eb43d2011-03-02 12:01:13 -0500398 if (err)
Ryusuke Konishid2500652009-04-06 19:01:34 -0700399 goto out_dir;
Jiro SEKIBA565de402009-11-27 19:41:08 +0900400 if (dir_de) {
401 inc_nlink(new_dir);
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900402 nilfs_mark_inode_dirty(new_dir);
Jiro SEKIBA565de402009-11-27 19:41:08 +0900403 }
Ryusuke Konishid2500652009-04-06 19:01:34 -0700404 }
405
406 /*
407 * Like most other Unix systems, set the ctime for inodes on a
408 * rename.
Ryusuke Konishid2500652009-04-06 19:01:34 -0700409 */
410 old_inode->i_ctime = CURRENT_TIME;
411
412 nilfs_delete_entry(old_de, old_page);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700413
414 if (dir_de) {
415 nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
Jiro SEKIBA565de402009-11-27 19:41:08 +0900416 drop_nlink(old_dir);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700417 }
Jiro SEKIBAabdb3182009-11-27 19:41:14 +0900418 nilfs_mark_inode_dirty(old_dir);
419 nilfs_mark_inode_dirty(old_inode);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700420
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700421 err = nilfs_transaction_commit(old_dir->i_sb);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700422 return err;
423
424out_dir:
425 if (dir_de) {
426 kunmap(dir_page);
427 page_cache_release(dir_page);
428 }
429out_old:
430 kunmap(old_page);
431 page_cache_release(old_page);
432out:
Ryusuke Konishi47420c72009-04-06 19:01:45 -0700433 nilfs_transaction_abort(old_dir->i_sb);
Ryusuke Konishid2500652009-04-06 19:01:34 -0700434 return err;
435}
436
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900437/*
438 * Export operations
439 */
440static struct dentry *nilfs_get_parent(struct dentry *child)
441{
442 unsigned long ino;
443 struct inode *inode;
Linus Torvalds26fe5752012-05-10 13:14:12 -0700444 struct qstr dotdot = QSTR_INIT("..", 2);
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900445 struct nilfs_root *root;
446
447 ino = nilfs_inode_by_name(child->d_inode, &dotdot);
448 if (!ino)
449 return ERR_PTR(-ENOENT);
450
451 root = NILFS_I(child->d_inode)->i_root;
452
453 inode = nilfs_iget(child->d_inode->i_sb, root, ino);
454 if (IS_ERR(inode))
455 return ERR_CAST(inode);
456
457 return d_obtain_alias(inode);
458}
459
460static struct dentry *nilfs_get_dentry(struct super_block *sb, u64 cno,
461 u64 ino, u32 gen)
462{
463 struct nilfs_root *root;
464 struct inode *inode;
465
466 if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO)
467 return ERR_PTR(-ESTALE);
468
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900469 root = nilfs_lookup_root(sb->s_fs_info, cno);
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900470 if (!root)
471 return ERR_PTR(-ESTALE);
472
473 inode = nilfs_iget(sb, root, ino);
474 nilfs_put_root(root);
475
476 if (IS_ERR(inode))
477 return ERR_CAST(inode);
478 if (gen && inode->i_generation != gen) {
479 iput(inode);
480 return ERR_PTR(-ESTALE);
481 }
482 return d_obtain_alias(inode);
483}
484
485static struct dentry *nilfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
486 int fh_len, int fh_type)
487{
488 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
489
490 if ((fh_len != NILFS_FID_SIZE_NON_CONNECTABLE &&
491 fh_len != NILFS_FID_SIZE_CONNECTABLE) ||
492 (fh_type != FILEID_NILFS_WITH_PARENT &&
493 fh_type != FILEID_NILFS_WITHOUT_PARENT))
494 return NULL;
495
496 return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen);
497}
498
499static struct dentry *nilfs_fh_to_parent(struct super_block *sb, struct fid *fh,
500 int fh_len, int fh_type)
501{
502 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
503
504 if (fh_len != NILFS_FID_SIZE_CONNECTABLE ||
505 fh_type != FILEID_NILFS_WITH_PARENT)
506 return NULL;
507
508 return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen);
509}
510
Al Virob0b03822012-04-02 14:34:06 -0400511static int nilfs_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
512 struct inode *parent)
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900513{
514 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900515 struct nilfs_root *root = NILFS_I(inode)->i_root;
516 int type;
517
Al Virob0b03822012-04-02 14:34:06 -0400518 if (parent && *lenp < NILFS_FID_SIZE_CONNECTABLE) {
519 *lenp = NILFS_FID_SIZE_CONNECTABLE;
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900520 return 255;
Al Virob0b03822012-04-02 14:34:06 -0400521 }
522 if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE) {
523 *lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
524 return 255;
525 }
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900526
527 fid->cno = root->cno;
528 fid->ino = inode->i_ino;
529 fid->gen = inode->i_generation;
530
Al Virob0b03822012-04-02 14:34:06 -0400531 if (parent) {
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900532 fid->parent_ino = parent->i_ino;
533 fid->parent_gen = parent->i_generation;
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900534 type = FILEID_NILFS_WITH_PARENT;
535 *lenp = NILFS_FID_SIZE_CONNECTABLE;
536 } else {
537 type = FILEID_NILFS_WITHOUT_PARENT;
538 *lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
539 }
540
541 return type;
542}
543
Alexey Dobriyan6e1d5dc2009-09-21 17:01:11 -0700544const struct inode_operations nilfs_dir_inode_operations = {
Ryusuke Konishid2500652009-04-06 19:01:34 -0700545 .create = nilfs_create,
546 .lookup = nilfs_lookup,
547 .link = nilfs_link,
548 .unlink = nilfs_unlink,
549 .symlink = nilfs_symlink,
550 .mkdir = nilfs_mkdir,
551 .rmdir = nilfs_rmdir,
552 .mknod = nilfs_mknod,
553 .rename = nilfs_rename,
554 .setattr = nilfs_setattr,
555 .permission = nilfs_permission,
Ryusuke Konishi622daaff2010-12-26 16:38:43 +0900556 .fiemap = nilfs_fiemap,
Ryusuke Konishid2500652009-04-06 19:01:34 -0700557};
558
Alexey Dobriyan6e1d5dc2009-09-21 17:01:11 -0700559const struct inode_operations nilfs_special_inode_operations = {
Ryusuke Konishid2500652009-04-06 19:01:34 -0700560 .setattr = nilfs_setattr,
561 .permission = nilfs_permission,
562};
563
Alexey Dobriyan6e1d5dc2009-09-21 17:01:11 -0700564const struct inode_operations nilfs_symlink_inode_operations = {
Ryusuke Konishid2500652009-04-06 19:01:34 -0700565 .readlink = generic_readlink,
566 .follow_link = page_follow_link_light,
567 .put_link = page_put_link,
Ryusuke Konishidc3d3b82010-08-15 23:33:57 +0900568 .permission = nilfs_permission,
Ryusuke Konishid2500652009-04-06 19:01:34 -0700569};
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +0900570
571const struct export_operations nilfs_export_ops = {
572 .encode_fh = nilfs_encode_fh,
573 .fh_to_dentry = nilfs_fh_to_dentry,
574 .fh_to_parent = nilfs_fh_to_parent,
575 .get_parent = nilfs_get_parent,
576};