2 * linux/fs/sysv/namei.c
5 * Copyright (C) 1991, 1992 Linus Torvalds
8 * Copyright (C) 1993 Pascal Haible, Bruno Haible
11 * Copyright (C) 1993 Bruno Haible
12 * Copyright (C) 1997, 1998 Krzysztof G. Baranowski
15 #include <linux/pagemap.h>
18 static int add_nondir(struct dentry *dentry, struct inode *inode)
20 int err = sysv_add_link(dentry, inode);
22 d_instantiate(dentry, inode);
25 inode_dec_link_count(inode);
30 static int sysv_hash(const struct dentry *dentry, struct qstr *qstr)
32 /* Truncate the name in place, avoids having to define a compare
34 if (qstr->len > SYSV_NAMELEN) {
35 qstr->len = SYSV_NAMELEN;
36 qstr->hash = full_name_hash(qstr->name, qstr->len);
41 const struct dentry_operations sysv_dentry_operations = {
45 static struct dentry *sysv_lookup(struct inode * dir, struct dentry * dentry, unsigned int flags)
47 struct inode * inode = NULL;
50 if (dentry->d_name.len > SYSV_NAMELEN)
51 return ERR_PTR(-ENAMETOOLONG);
52 ino = sysv_inode_by_name(dentry);
55 inode = sysv_iget(dir->i_sb, ino);
57 return ERR_CAST(inode);
63 static int sysv_mknod(struct inode * dir, struct dentry * dentry, umode_t mode, dev_t rdev)
68 if (!old_valid_dev(rdev))
71 inode = sysv_new_inode(dir, mode);
75 sysv_set_inode(inode, rdev);
76 mark_inode_dirty(inode);
77 err = add_nondir(dentry, inode);
82 static int sysv_create(struct inode * dir, struct dentry * dentry, umode_t mode, bool excl)
84 return sysv_mknod(dir, dentry, mode, 0);
87 static int sysv_symlink(struct inode * dir, struct dentry * dentry,
90 int err = -ENAMETOOLONG;
91 int l = strlen(symname)+1;
94 if (l > dir->i_sb->s_blocksize)
97 inode = sysv_new_inode(dir, S_IFLNK|0777);
102 sysv_set_inode(inode, 0);
103 err = page_symlink(inode, symname, l);
107 mark_inode_dirty(inode);
108 err = add_nondir(dentry, inode);
113 inode_dec_link_count(inode);
118 static int sysv_link(struct dentry * old_dentry, struct inode * dir,
119 struct dentry * dentry)
121 struct inode *inode = old_dentry->d_inode;
123 inode->i_ctime = CURRENT_TIME_SEC;
124 inode_inc_link_count(inode);
127 return add_nondir(dentry, inode);
130 static int sysv_mkdir(struct inode * dir, struct dentry *dentry, umode_t mode)
132 struct inode * inode;
135 inode_inc_link_count(dir);
137 inode = sysv_new_inode(dir, S_IFDIR|mode);
138 err = PTR_ERR(inode);
142 sysv_set_inode(inode, 0);
144 inode_inc_link_count(inode);
146 err = sysv_make_empty(inode, dir);
150 err = sysv_add_link(dentry, inode);
154 d_instantiate(dentry, inode);
159 inode_dec_link_count(inode);
160 inode_dec_link_count(inode);
163 inode_dec_link_count(dir);
167 static int sysv_unlink(struct inode * dir, struct dentry * dentry)
169 struct inode * inode = dentry->d_inode;
171 struct sysv_dir_entry * de;
174 de = sysv_find_entry(dentry, &page);
178 err = sysv_delete_entry (de, page);
182 inode->i_ctime = dir->i_ctime;
183 inode_dec_link_count(inode);
188 static int sysv_rmdir(struct inode * dir, struct dentry * dentry)
190 struct inode *inode = dentry->d_inode;
191 int err = -ENOTEMPTY;
193 if (sysv_empty_dir(inode)) {
194 err = sysv_unlink(dir, dentry);
197 inode_dec_link_count(inode);
198 inode_dec_link_count(dir);
205 * Anybody can rename anything with this: the permission checks are left to the
206 * higher-level routines.
208 static int sysv_rename(struct inode * old_dir, struct dentry * old_dentry,
209 struct inode * new_dir, struct dentry * new_dentry)
211 struct inode * old_inode = old_dentry->d_inode;
212 struct inode * new_inode = new_dentry->d_inode;
213 struct page * dir_page = NULL;
214 struct sysv_dir_entry * dir_de = NULL;
215 struct page * old_page;
216 struct sysv_dir_entry * old_de;
219 old_de = sysv_find_entry(old_dentry, &old_page);
223 if (S_ISDIR(old_inode->i_mode)) {
225 dir_de = sysv_dotdot(old_inode, &dir_page);
231 struct page * new_page;
232 struct sysv_dir_entry * new_de;
235 if (dir_de && !sysv_empty_dir(new_inode))
239 new_de = sysv_find_entry(new_dentry, &new_page);
242 sysv_set_link(new_de, new_page, old_inode);
243 new_inode->i_ctime = CURRENT_TIME_SEC;
245 drop_nlink(new_inode);
246 inode_dec_link_count(new_inode);
248 err = sysv_add_link(new_dentry, old_inode);
252 inode_inc_link_count(new_dir);
255 sysv_delete_entry(old_de, old_page);
256 mark_inode_dirty(old_inode);
259 sysv_set_link(dir_de, dir_page, new_dir);
260 inode_dec_link_count(old_dir);
267 page_cache_release(dir_page);
271 page_cache_release(old_page);
277 * directories can handle most operations...
279 const struct inode_operations sysv_dir_inode_operations = {
280 .create = sysv_create,
281 .lookup = sysv_lookup,
283 .unlink = sysv_unlink,
284 .symlink = sysv_symlink,
288 .rename = sysv_rename,
289 .getattr = sysv_getattr,