1 // SPDX-License-Identifier: GPL-2.0
3 * linux/fs/minix/namei.c
5 * Copyright (C) 1991, 1992 Linus Torvalds
10 static int add_nondir(struct dentry *dentry, struct inode *inode)
12 int err = minix_add_link(dentry, inode);
14 d_instantiate(dentry, inode);
17 inode_dec_link_count(inode);
22 static struct dentry *minix_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags)
24 struct inode * inode = NULL;
27 if (dentry->d_name.len > minix_sb(dir->i_sb)->s_namelen)
28 return ERR_PTR(-ENAMETOOLONG);
30 ino = minix_inode_by_name(dentry);
32 inode = minix_iget(dir->i_sb, ino);
33 return d_splice_alias(inode, dentry);
36 static int minix_mknod(struct inode * dir, struct dentry *dentry, umode_t mode, dev_t rdev)
41 if (!old_valid_dev(rdev))
44 inode = minix_new_inode(dir, mode, &error);
47 minix_set_inode(inode, rdev);
48 mark_inode_dirty(inode);
49 error = add_nondir(dentry, inode);
54 static int minix_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
57 struct inode *inode = minix_new_inode(dir, mode, &error);
59 minix_set_inode(inode, 0);
60 mark_inode_dirty(inode);
61 d_tmpfile(dentry, inode);
66 static int minix_create(struct inode *dir, struct dentry *dentry, umode_t mode,
69 return minix_mknod(dir, dentry, mode, 0);
72 static int minix_symlink(struct inode * dir, struct dentry *dentry,
75 int err = -ENAMETOOLONG;
76 int i = strlen(symname)+1;
79 if (i > dir->i_sb->s_blocksize)
82 inode = minix_new_inode(dir, S_IFLNK | 0777, &err);
86 minix_set_inode(inode, 0);
87 err = page_symlink(inode, symname, i);
91 err = add_nondir(dentry, inode);
96 inode_dec_link_count(inode);
101 static int minix_link(struct dentry * old_dentry, struct inode * dir,
102 struct dentry *dentry)
104 struct inode *inode = d_inode(old_dentry);
106 inode->i_ctime = current_time(inode);
107 inode_inc_link_count(inode);
109 return add_nondir(dentry, inode);
112 static int minix_mkdir(struct inode * dir, struct dentry *dentry, umode_t mode)
114 struct inode * inode;
117 inode_inc_link_count(dir);
119 inode = minix_new_inode(dir, S_IFDIR | mode, &err);
123 minix_set_inode(inode, 0);
125 inode_inc_link_count(inode);
127 err = minix_make_empty(inode, dir);
131 err = minix_add_link(dentry, inode);
135 d_instantiate(dentry, inode);
140 inode_dec_link_count(inode);
141 inode_dec_link_count(inode);
144 inode_dec_link_count(dir);
148 static int minix_unlink(struct inode * dir, struct dentry *dentry)
151 struct inode * inode = d_inode(dentry);
153 struct minix_dir_entry * de;
155 de = minix_find_entry(dentry, &page);
159 err = minix_delete_entry(de, page);
163 inode->i_ctime = dir->i_ctime;
164 inode_dec_link_count(inode);
169 static int minix_rmdir(struct inode * dir, struct dentry *dentry)
171 struct inode * inode = d_inode(dentry);
172 int err = -ENOTEMPTY;
174 if (minix_empty_dir(inode)) {
175 err = minix_unlink(dir, dentry);
177 inode_dec_link_count(dir);
178 inode_dec_link_count(inode);
184 static int minix_rename(struct inode * old_dir, struct dentry *old_dentry,
185 struct inode * new_dir, struct dentry *new_dentry,
188 struct inode * old_inode = d_inode(old_dentry);
189 struct inode * new_inode = d_inode(new_dentry);
190 struct page * dir_page = NULL;
191 struct minix_dir_entry * dir_de = NULL;
192 struct page * old_page;
193 struct minix_dir_entry * old_de;
196 if (flags & ~RENAME_NOREPLACE)
199 old_de = minix_find_entry(old_dentry, &old_page);
203 if (S_ISDIR(old_inode->i_mode)) {
205 dir_de = minix_dotdot(old_inode, &dir_page);
211 struct page * new_page;
212 struct minix_dir_entry * new_de;
215 if (dir_de && !minix_empty_dir(new_inode))
219 new_de = minix_find_entry(new_dentry, &new_page);
222 minix_set_link(new_de, new_page, old_inode);
223 new_inode->i_ctime = current_time(new_inode);
225 drop_nlink(new_inode);
226 inode_dec_link_count(new_inode);
228 err = minix_add_link(new_dentry, old_inode);
232 inode_inc_link_count(new_dir);
235 minix_delete_entry(old_de, old_page);
236 mark_inode_dirty(old_inode);
239 minix_set_link(dir_de, dir_page, new_dir);
240 inode_dec_link_count(old_dir);
257 * directories can handle most operations...
259 const struct inode_operations minix_dir_inode_operations = {
260 .create = minix_create,
261 .lookup = minix_lookup,
263 .unlink = minix_unlink,
264 .symlink = minix_symlink,
265 .mkdir = minix_mkdir,
266 .rmdir = minix_rmdir,
267 .mknod = minix_mknod,
268 .rename = minix_rename,
269 .getattr = minix_getattr,
270 .tmpfile = minix_tmpfile,