2 * linux/fs/minix/namei.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
9 static int add_nondir(struct dentry *dentry, struct inode *inode)
11 int err = minix_add_link(dentry, inode);
13 d_instantiate(dentry, inode);
16 inode_dec_link_count(inode);
21 static struct dentry *minix_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd)
23 struct inode * inode = NULL;
26 if (dentry->d_name.len > minix_sb(dir->i_sb)->s_namelen)
27 return ERR_PTR(-ENAMETOOLONG);
29 ino = minix_inode_by_name(dentry);
31 inode = minix_iget(dir->i_sb, ino);
33 return ERR_CAST(inode);
39 static int minix_mknod(struct inode * dir, struct dentry *dentry, int mode, dev_t rdev)
44 if (!old_valid_dev(rdev))
47 inode = minix_new_inode(dir, mode, &error);
50 minix_set_inode(inode, rdev);
51 mark_inode_dirty(inode);
52 error = add_nondir(dentry, inode);
57 static int minix_create(struct inode * dir, struct dentry *dentry, int mode,
60 return minix_mknod(dir, dentry, mode, 0);
63 static int minix_symlink(struct inode * dir, struct dentry *dentry,
66 int err = -ENAMETOOLONG;
67 int i = strlen(symname)+1;
70 if (i > dir->i_sb->s_blocksize)
73 inode = minix_new_inode(dir, S_IFLNK | 0777, &err);
77 minix_set_inode(inode, 0);
78 err = page_symlink(inode, symname, i);
82 err = add_nondir(dentry, inode);
87 inode_dec_link_count(inode);
92 static int minix_link(struct dentry * old_dentry, struct inode * dir,
93 struct dentry *dentry)
95 struct inode *inode = old_dentry->d_inode;
97 if (inode->i_nlink >= minix_sb(inode->i_sb)->s_link_max)
100 inode->i_ctime = CURRENT_TIME_SEC;
101 inode_inc_link_count(inode);
103 return add_nondir(dentry, inode);
106 static int minix_mkdir(struct inode * dir, struct dentry *dentry, int mode)
108 struct inode * inode;
111 if (dir->i_nlink >= minix_sb(dir->i_sb)->s_link_max)
114 inode_inc_link_count(dir);
116 inode = minix_new_inode(dir, S_IFDIR | mode, &err);
120 minix_set_inode(inode, 0);
122 inode_inc_link_count(inode);
124 err = minix_make_empty(inode, dir);
128 err = minix_add_link(dentry, inode);
132 d_instantiate(dentry, inode);
137 inode_dec_link_count(inode);
138 inode_dec_link_count(inode);
141 inode_dec_link_count(dir);
145 static int minix_unlink(struct inode * dir, struct dentry *dentry)
148 struct inode * inode = dentry->d_inode;
150 struct minix_dir_entry * de;
152 de = minix_find_entry(dentry, &page);
156 err = minix_delete_entry(de, page);
160 inode->i_ctime = dir->i_ctime;
161 inode_dec_link_count(inode);
166 static int minix_rmdir(struct inode * dir, struct dentry *dentry)
168 struct inode * inode = dentry->d_inode;
169 int err = -ENOTEMPTY;
171 if (minix_empty_dir(inode)) {
172 err = minix_unlink(dir, dentry);
174 inode_dec_link_count(dir);
175 inode_dec_link_count(inode);
181 static int minix_rename(struct inode * old_dir, struct dentry *old_dentry,
182 struct inode * new_dir, struct dentry *new_dentry)
184 struct minix_sb_info * info = minix_sb(old_dir->i_sb);
185 struct inode * old_inode = old_dentry->d_inode;
186 struct inode * new_inode = new_dentry->d_inode;
187 struct page * dir_page = NULL;
188 struct minix_dir_entry * dir_de = NULL;
189 struct page * old_page;
190 struct minix_dir_entry * old_de;
193 old_de = minix_find_entry(old_dentry, &old_page);
197 if (S_ISDIR(old_inode->i_mode)) {
199 dir_de = minix_dotdot(old_inode, &dir_page);
205 struct page * new_page;
206 struct minix_dir_entry * new_de;
209 if (dir_de && !minix_empty_dir(new_inode))
213 new_de = minix_find_entry(new_dentry, &new_page);
216 minix_set_link(new_de, new_page, old_inode);
217 new_inode->i_ctime = CURRENT_TIME_SEC;
219 drop_nlink(new_inode);
220 inode_dec_link_count(new_inode);
224 if (new_dir->i_nlink >= info->s_link_max)
227 err = minix_add_link(new_dentry, old_inode);
231 inode_inc_link_count(new_dir);
234 minix_delete_entry(old_de, old_page);
235 mark_inode_dirty(old_inode);
238 minix_set_link(dir_de, dir_page, new_dir);
239 inode_dec_link_count(old_dir);
246 page_cache_release(dir_page);
250 page_cache_release(old_page);
256 * directories can handle most operations...
258 const struct inode_operations minix_dir_inode_operations = {
259 .create = minix_create,
260 .lookup = minix_lookup,
262 .unlink = minix_unlink,
263 .symlink = minix_symlink,
264 .mkdir = minix_mkdir,
265 .rmdir = minix_rmdir,
266 .mknod = minix_mknod,
267 .rename = minix_rename,
268 .getattr = minix_getattr,