4 * Migration to usage of "page cache" on May 2006 by
5 * Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base.
8 * Daniel Pirkl <daniel.pirkl@email.cz>
9 * Charles University, Faculty of Mathematics and Physics
13 * linux/fs/ext2/namei.c
15 * Copyright (C) 1992, 1993, 1994, 1995
16 * Remy Card (card@masi.ibp.fr)
17 * Laboratoire MASI - Institut Blaise Pascal
18 * Universite Pierre et Marie Curie (Paris VI)
22 * linux/fs/minix/namei.c
24 * Copyright (C) 1991, 1992 Linus Torvalds
26 * Big-endian to little-endian byte-swapping/bitmaps by
27 * David S. Miller (davem@caip.rutgers.edu), 1995
30 #include <linux/time.h>
37 static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode)
39 int err = ufs_add_link(dentry, inode);
41 d_instantiate_new(dentry, inode);
44 inode_dec_link_count(inode);
45 unlock_new_inode(inode);
50 static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags)
52 struct inode * inode = NULL;
55 if (dentry->d_name.len > UFS_MAXNAMLEN)
56 return ERR_PTR(-ENAMETOOLONG);
58 ino = ufs_inode_by_name(dir, &dentry->d_name);
60 inode = ufs_iget(dir->i_sb, ino);
61 return d_splice_alias(inode, dentry);
65 * By the time this is called, we already have created
66 * the directory cache entry for the new file, but it
67 * is so far negative - it has no inode.
69 * If the create succeeds, we fill in the inode information
70 * with d_instantiate().
72 static int ufs_create (struct inode * dir, struct dentry * dentry, umode_t mode,
77 inode = ufs_new_inode(dir, mode);
79 return PTR_ERR(inode);
81 inode->i_op = &ufs_file_inode_operations;
82 inode->i_fop = &ufs_file_operations;
83 inode->i_mapping->a_ops = &ufs_aops;
84 mark_inode_dirty(inode);
85 return ufs_add_nondir(dentry, inode);
88 static int ufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
93 if (!old_valid_dev(rdev))
96 inode = ufs_new_inode(dir, mode);
99 init_special_inode(inode, mode, rdev);
100 ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev);
101 mark_inode_dirty(inode);
102 err = ufs_add_nondir(dentry, inode);
107 static int ufs_symlink (struct inode * dir, struct dentry * dentry,
108 const char * symname)
110 struct super_block * sb = dir->i_sb;
112 unsigned l = strlen(symname)+1;
113 struct inode * inode;
115 if (l > sb->s_blocksize)
116 return -ENAMETOOLONG;
118 inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO);
119 err = PTR_ERR(inode);
123 if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
125 inode->i_op = &ufs_symlink_inode_operations;
126 inode->i_mapping->a_ops = &ufs_aops;
127 err = page_symlink(inode, symname, l);
132 inode->i_op = &ufs_fast_symlink_inode_operations;
133 inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
134 memcpy(inode->i_link, symname, l);
137 mark_inode_dirty(inode);
139 return ufs_add_nondir(dentry, inode);
142 inode_dec_link_count(inode);
143 unlock_new_inode(inode);
148 static int ufs_link (struct dentry * old_dentry, struct inode * dir,
149 struct dentry *dentry)
151 struct inode *inode = d_inode(old_dentry);
154 inode->i_ctime = CURRENT_TIME_SEC;
155 inode_inc_link_count(inode);
158 error = ufs_add_link(dentry, inode);
160 inode_dec_link_count(inode);
163 d_instantiate(dentry, inode);
167 static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
169 struct inode * inode;
172 inode_inc_link_count(dir);
174 inode = ufs_new_inode(dir, S_IFDIR|mode);
175 err = PTR_ERR(inode);
179 inode->i_op = &ufs_dir_inode_operations;
180 inode->i_fop = &ufs_dir_operations;
181 inode->i_mapping->a_ops = &ufs_aops;
183 inode_inc_link_count(inode);
185 err = ufs_make_empty(inode, dir);
189 err = ufs_add_link(dentry, inode);
193 d_instantiate_new(dentry, inode);
197 inode_dec_link_count(inode);
198 inode_dec_link_count(inode);
199 unlock_new_inode(inode);
202 inode_dec_link_count(dir);
206 static int ufs_unlink(struct inode *dir, struct dentry *dentry)
208 struct inode * inode = d_inode(dentry);
209 struct ufs_dir_entry *de;
213 de = ufs_find_entry(dir, &dentry->d_name, &page);
217 err = ufs_delete_entry(dir, de, page);
221 inode->i_ctime = dir->i_ctime;
222 inode_dec_link_count(inode);
228 static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
230 struct inode * inode = d_inode(dentry);
233 if (ufs_empty_dir (inode)) {
234 err = ufs_unlink(dir, dentry);
237 inode_dec_link_count(inode);
238 inode_dec_link_count(dir);
244 static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry,
245 struct inode *new_dir, struct dentry *new_dentry)
247 struct inode *old_inode = d_inode(old_dentry);
248 struct inode *new_inode = d_inode(new_dentry);
249 struct page *dir_page = NULL;
250 struct ufs_dir_entry * dir_de = NULL;
251 struct page *old_page;
252 struct ufs_dir_entry *old_de;
255 old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page);
259 if (S_ISDIR(old_inode->i_mode)) {
261 dir_de = ufs_dotdot(old_inode, &dir_page);
267 struct page *new_page;
268 struct ufs_dir_entry *new_de;
271 if (dir_de && !ufs_empty_dir(new_inode))
275 new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page);
278 ufs_set_link(new_dir, new_de, new_page, old_inode, 1);
279 new_inode->i_ctime = CURRENT_TIME_SEC;
281 drop_nlink(new_inode);
282 inode_dec_link_count(new_inode);
284 err = ufs_add_link(new_dentry, old_inode);
288 inode_inc_link_count(new_dir);
292 * Like most other Unix systems, set the ctime for inodes on a
295 old_inode->i_ctime = CURRENT_TIME_SEC;
297 ufs_delete_entry(old_dir, old_de, old_page);
298 mark_inode_dirty(old_inode);
301 if (old_dir != new_dir)
302 ufs_set_link(old_inode, dir_de, dir_page, new_dir, 0);
305 page_cache_release(dir_page);
307 inode_dec_link_count(old_dir);
315 page_cache_release(dir_page);
319 page_cache_release(old_page);
324 const struct inode_operations ufs_dir_inode_operations = {
325 .create = ufs_create,
326 .lookup = ufs_lookup,
328 .unlink = ufs_unlink,
329 .symlink = ufs_symlink,
333 .rename = ufs_rename,