2 * namei.c - NILFS pathname lookup operations.
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
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.
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.
16 * Modified for NILFS by Amagai Yoshiji and Ryusuke Konishi.
19 * linux/fs/ext2/namei.c
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)
28 * linux/fs/minix/namei.c
30 * Copyright (C) 1991, 1992 Linus Torvalds
32 * Big-endian to little-endian byte-swapping/bitmaps by
33 * David S. Miller (davem@caip.rutgers.edu), 1995
36 #include <linux/pagemap.h>
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)
44 static inline int nilfs_add_nondir(struct dentry *dentry, struct inode *inode)
46 int err = nilfs_add_link(dentry, inode);
48 d_instantiate(dentry, inode);
49 unlock_new_inode(inode);
52 inode_dec_link_count(inode);
53 unlock_new_inode(inode);
62 static struct dentry *
63 nilfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
68 if (dentry->d_name.len > NILFS_NAME_LEN)
69 return ERR_PTR(-ENAMETOOLONG);
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);
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.
81 * If the create succeeds, we fill in the inode information
82 * with d_instantiate().
84 static int nilfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
88 struct nilfs_transaction_info ti;
91 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
94 inode = nilfs_new_inode(dir, mode);
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);
104 err = nilfs_transaction_commit(dir->i_sb);
106 nilfs_transaction_abort(dir->i_sb);
112 nilfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
115 struct nilfs_transaction_info ti;
118 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
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);
129 err = nilfs_transaction_commit(dir->i_sb);
131 nilfs_transaction_abort(dir->i_sb);
136 static int nilfs_symlink(struct inode *dir, struct dentry *dentry,
139 struct nilfs_transaction_info ti;
140 struct super_block *sb = dir->i_sb;
141 unsigned l = strlen(symname)+1;
145 if (l > sb->s_blocksize)
146 return -ENAMETOOLONG;
148 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
152 inode = nilfs_new_inode(dir, S_IFLNK | S_IRWXUGO);
153 err = PTR_ERR(inode);
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);
165 /* mark_inode_dirty(inode); */
166 /* page_symlink() do this */
168 err = nilfs_add_nondir(dentry, inode);
171 err = nilfs_transaction_commit(dir->i_sb);
173 nilfs_transaction_abort(dir->i_sb);
179 nilfs_mark_inode_dirty(inode);
180 unlock_new_inode(inode);
185 static int nilfs_link(struct dentry *old_dentry, struct inode *dir,
186 struct dentry *dentry)
188 struct inode *inode = d_inode(old_dentry);
189 struct nilfs_transaction_info ti;
192 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
196 inode->i_ctime = CURRENT_TIME;
197 inode_inc_link_count(inode);
200 err = nilfs_add_link(dentry, inode);
202 d_instantiate(dentry, inode);
203 err = nilfs_transaction_commit(dir->i_sb);
205 inode_dec_link_count(inode);
207 nilfs_transaction_abort(dir->i_sb);
213 static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
216 struct nilfs_transaction_info ti;
219 err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
225 inode = nilfs_new_inode(dir, S_IFDIR | mode);
226 err = PTR_ERR(inode);
230 inode->i_op = &nilfs_dir_inode_operations;
231 inode->i_fop = &nilfs_dir_operations;
232 inode->i_mapping->a_ops = &nilfs_aops;
236 err = nilfs_make_empty(inode, dir);
240 err = nilfs_add_link(dentry, inode);
244 nilfs_mark_inode_dirty(inode);
245 d_instantiate(dentry, inode);
246 unlock_new_inode(inode);
249 err = nilfs_transaction_commit(dir->i_sb);
251 nilfs_transaction_abort(dir->i_sb);
258 nilfs_mark_inode_dirty(inode);
259 unlock_new_inode(inode);
263 nilfs_mark_inode_dirty(dir);
267 static int nilfs_do_unlink(struct inode *dir, struct dentry *dentry)
270 struct nilfs_dir_entry *de;
275 de = nilfs_find_entry(dir, &dentry->d_name, &page);
279 inode = d_inode(dentry);
281 if (le64_to_cpu(de->inode) != inode->i_ino)
284 if (!inode->i_nlink) {
285 nilfs_warning(inode->i_sb, __func__,
286 "deleting nonexistent file (%lu), %d\n",
287 inode->i_ino, inode->i_nlink);
290 err = nilfs_delete_entry(de, page);
294 inode->i_ctime = dir->i_ctime;
301 static int nilfs_unlink(struct inode *dir, struct dentry *dentry)
303 struct nilfs_transaction_info ti;
306 err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
310 err = nilfs_do_unlink(dir, dentry);
313 nilfs_mark_inode_dirty(dir);
314 nilfs_mark_inode_dirty(d_inode(dentry));
315 err = nilfs_transaction_commit(dir->i_sb);
317 nilfs_transaction_abort(dir->i_sb);
322 static int nilfs_rmdir(struct inode *dir, struct dentry *dentry)
324 struct inode *inode = d_inode(dentry);
325 struct nilfs_transaction_info ti;
328 err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
333 if (nilfs_empty_dir(inode)) {
334 err = nilfs_do_unlink(dir, dentry);
338 nilfs_mark_inode_dirty(inode);
340 nilfs_mark_inode_dirty(dir);
344 err = nilfs_transaction_commit(dir->i_sb);
346 nilfs_transaction_abort(dir->i_sb);
351 static int nilfs_rename(struct inode *old_dir, struct dentry *old_dentry,
352 struct inode *new_dir, struct dentry *new_dentry)
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;
363 err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
368 old_de = nilfs_find_entry(old_dir, &old_dentry->d_name, &old_page);
372 if (S_ISDIR(old_inode->i_mode)) {
374 dir_de = nilfs_dotdot(old_inode, &dir_page);
380 struct page *new_page;
381 struct nilfs_dir_entry *new_de;
384 if (dir_de && !nilfs_empty_dir(new_inode))
388 new_de = nilfs_find_entry(new_dir, &new_dentry->d_name, &new_page);
391 nilfs_set_link(new_dir, new_de, new_page, old_inode);
392 nilfs_mark_inode_dirty(new_dir);
393 new_inode->i_ctime = CURRENT_TIME;
395 drop_nlink(new_inode);
396 drop_nlink(new_inode);
397 nilfs_mark_inode_dirty(new_inode);
399 err = nilfs_add_link(new_dentry, old_inode);
404 nilfs_mark_inode_dirty(new_dir);
409 * Like most other Unix systems, set the ctime for inodes on a
412 old_inode->i_ctime = CURRENT_TIME;
414 nilfs_delete_entry(old_de, old_page);
417 nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
420 nilfs_mark_inode_dirty(old_dir);
421 nilfs_mark_inode_dirty(old_inode);
423 err = nilfs_transaction_commit(old_dir->i_sb);
435 nilfs_transaction_abort(old_dir->i_sb);
442 static struct dentry *nilfs_get_parent(struct dentry *child)
446 struct qstr dotdot = QSTR_INIT("..", 2);
447 struct nilfs_root *root;
449 ino = nilfs_inode_by_name(d_inode(child), &dotdot);
451 return ERR_PTR(-ENOENT);
453 root = NILFS_I(d_inode(child))->i_root;
455 inode = nilfs_iget(child->d_sb, root, ino);
457 return ERR_CAST(inode);
459 return d_obtain_alias(inode);
462 static struct dentry *nilfs_get_dentry(struct super_block *sb, u64 cno,
465 struct nilfs_root *root;
468 if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO)
469 return ERR_PTR(-ESTALE);
471 root = nilfs_lookup_root(sb->s_fs_info, cno);
473 return ERR_PTR(-ESTALE);
475 inode = nilfs_iget(sb, root, ino);
476 nilfs_put_root(root);
479 return ERR_CAST(inode);
480 if (gen && inode->i_generation != gen) {
482 return ERR_PTR(-ESTALE);
484 return d_obtain_alias(inode);
487 static struct dentry *nilfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
488 int fh_len, int fh_type)
490 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
492 if (fh_len < NILFS_FID_SIZE_NON_CONNECTABLE ||
493 (fh_type != FILEID_NILFS_WITH_PARENT &&
494 fh_type != FILEID_NILFS_WITHOUT_PARENT))
497 return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen);
500 static struct dentry *nilfs_fh_to_parent(struct super_block *sb, struct fid *fh,
501 int fh_len, int fh_type)
503 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
505 if (fh_len < NILFS_FID_SIZE_CONNECTABLE ||
506 fh_type != FILEID_NILFS_WITH_PARENT)
509 return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen);
512 static int nilfs_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
513 struct inode *parent)
515 struct nilfs_fid *fid = (struct nilfs_fid *)fh;
516 struct nilfs_root *root = NILFS_I(inode)->i_root;
519 if (parent && *lenp < NILFS_FID_SIZE_CONNECTABLE) {
520 *lenp = NILFS_FID_SIZE_CONNECTABLE;
521 return FILEID_INVALID;
523 if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE) {
524 *lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
525 return FILEID_INVALID;
528 fid->cno = root->cno;
529 fid->ino = inode->i_ino;
530 fid->gen = inode->i_generation;
533 fid->parent_ino = parent->i_ino;
534 fid->parent_gen = parent->i_generation;
535 type = FILEID_NILFS_WITH_PARENT;
536 *lenp = NILFS_FID_SIZE_CONNECTABLE;
538 type = FILEID_NILFS_WITHOUT_PARENT;
539 *lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
545 const struct inode_operations nilfs_dir_inode_operations = {
546 .create = nilfs_create,
547 .lookup = nilfs_lookup,
549 .unlink = nilfs_unlink,
550 .symlink = nilfs_symlink,
551 .mkdir = nilfs_mkdir,
552 .rmdir = nilfs_rmdir,
553 .mknod = nilfs_mknod,
554 .rename = nilfs_rename,
555 .setattr = nilfs_setattr,
556 .permission = nilfs_permission,
557 .fiemap = nilfs_fiemap,
560 const struct inode_operations nilfs_special_inode_operations = {
561 .setattr = nilfs_setattr,
562 .permission = nilfs_permission,
565 const struct inode_operations nilfs_symlink_inode_operations = {
566 .readlink = generic_readlink,
567 .get_link = page_get_link,
568 .permission = nilfs_permission,
571 const 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,