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 unlock_new_inode(inode);
42 d_instantiate(dentry, inode);
45 inode_dec_link_count(inode);
46 unlock_new_inode(inode);
51 static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags)
53 struct inode * inode = NULL;
56 if (dentry->d_name.len > UFS_MAXNAMLEN)
57 return ERR_PTR(-ENAMETOOLONG);
60 ino = ufs_inode_by_name(dir, &dentry->d_name);
62 inode = ufs_iget(dir->i_sb, ino);
63 unlock_ufs(dir->i_sb);
64 return d_splice_alias(inode, dentry);
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.
72 * If the create succeeds, we fill in the inode information
73 * with d_instantiate().
75 static int ufs_create (struct inode * dir, struct dentry * dentry, umode_t mode,
83 inode = ufs_new_inode(dir, mode);
87 inode->i_op = &ufs_file_inode_operations;
88 inode->i_fop = &ufs_file_operations;
89 inode->i_mapping->a_ops = &ufs_aops;
90 mark_inode_dirty(inode);
92 err = ufs_add_nondir(dentry, inode);
93 unlock_ufs(dir->i_sb);
95 UFSD("END: err=%d\n", err);
99 static int ufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
104 if (!old_valid_dev(rdev))
107 inode = ufs_new_inode(dir, mode);
108 err = PTR_ERR(inode);
109 if (!IS_ERR(inode)) {
110 init_special_inode(inode, mode, rdev);
111 ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev);
112 mark_inode_dirty(inode);
114 err = ufs_add_nondir(dentry, inode);
115 unlock_ufs(dir->i_sb);
120 static int ufs_symlink (struct inode * dir, struct dentry * dentry,
121 const char * symname)
123 struct super_block * sb = dir->i_sb;
124 int err = -ENAMETOOLONG;
125 unsigned l = strlen(symname)+1;
126 struct inode * inode;
128 if (l > sb->s_blocksize)
131 inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO);
132 err = PTR_ERR(inode);
137 if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
139 inode->i_op = &ufs_symlink_inode_operations;
140 inode->i_mapping->a_ops = &ufs_aops;
141 err = page_symlink(inode, symname, l);
146 inode->i_op = &ufs_fast_symlink_inode_operations;
147 inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
148 memcpy(inode->i_link, symname, l);
151 mark_inode_dirty(inode);
153 err = ufs_add_nondir(dentry, inode);
155 unlock_ufs(dir->i_sb);
160 inode_dec_link_count(inode);
161 unlock_new_inode(inode);
166 static int ufs_link (struct dentry * old_dentry, struct inode * dir,
167 struct dentry *dentry)
169 struct inode *inode = d_inode(old_dentry);
174 inode->i_ctime = CURRENT_TIME_SEC;
175 inode_inc_link_count(inode);
178 error = ufs_add_nondir(dentry, inode);
179 unlock_ufs(dir->i_sb);
183 static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
185 struct inode * inode;
188 inode = ufs_new_inode(dir, S_IFDIR|mode);
190 return PTR_ERR(inode);
192 inode->i_op = &ufs_dir_inode_operations;
193 inode->i_fop = &ufs_dir_operations;
194 inode->i_mapping->a_ops = &ufs_aops;
196 inode_inc_link_count(inode);
199 inode_inc_link_count(dir);
201 err = ufs_make_empty(inode, dir);
205 err = ufs_add_link(dentry, inode);
208 unlock_ufs(dir->i_sb);
210 d_instantiate(dentry, inode);
215 inode_dec_link_count(inode);
216 inode_dec_link_count(inode);
217 unlock_new_inode(inode);
219 inode_dec_link_count(dir);
220 unlock_ufs(dir->i_sb);
224 static int ufs_unlink(struct inode *dir, struct dentry *dentry)
226 struct inode * inode = d_inode(dentry);
227 struct ufs_dir_entry *de;
231 de = ufs_find_entry(dir, &dentry->d_name, &page);
235 err = ufs_delete_entry(dir, de, page);
239 inode->i_ctime = dir->i_ctime;
240 inode_dec_link_count(inode);
246 static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
248 struct inode * inode = d_inode(dentry);
252 if (ufs_empty_dir (inode)) {
253 err = ufs_unlink(dir, dentry);
256 inode_dec_link_count(inode);
257 inode_dec_link_count(dir);
260 unlock_ufs(dir->i_sb);
264 static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry,
265 struct inode *new_dir, struct dentry *new_dentry)
267 struct inode *old_inode = d_inode(old_dentry);
268 struct inode *new_inode = d_inode(new_dentry);
269 struct page *dir_page = NULL;
270 struct ufs_dir_entry * dir_de = NULL;
271 struct page *old_page;
272 struct ufs_dir_entry *old_de;
275 old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page);
279 if (S_ISDIR(old_inode->i_mode)) {
281 dir_de = ufs_dotdot(old_inode, &dir_page);
287 struct page *new_page;
288 struct ufs_dir_entry *new_de;
291 if (dir_de && !ufs_empty_dir(new_inode))
295 new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page);
298 ufs_set_link(new_dir, new_de, new_page, old_inode);
299 new_inode->i_ctime = CURRENT_TIME_SEC;
301 drop_nlink(new_inode);
302 inode_dec_link_count(new_inode);
304 err = ufs_add_link(new_dentry, old_inode);
308 inode_inc_link_count(new_dir);
312 * Like most other Unix systems, set the ctime for inodes on a
315 old_inode->i_ctime = CURRENT_TIME_SEC;
317 ufs_delete_entry(old_dir, old_de, old_page);
318 mark_inode_dirty(old_inode);
321 ufs_set_link(old_inode, dir_de, dir_page, new_dir);
322 inode_dec_link_count(old_dir);
330 page_cache_release(dir_page);
334 page_cache_release(old_page);
339 const struct inode_operations ufs_dir_inode_operations = {
340 .create = ufs_create,
341 .lookup = ufs_lookup,
343 .unlink = ufs_unlink,
344 .symlink = ufs_symlink,
348 .rename = ufs_rename,