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, const struct inode *inode,
33 /* Truncate the name in place, avoids having to define a compare
35 if (qstr->len > SYSV_NAMELEN) {
36 qstr->len = SYSV_NAMELEN;
37 qstr->hash = full_name_hash(qstr->name, qstr->len);
42 const struct dentry_operations sysv_dentry_operations = {
46 static struct dentry *sysv_lookup(struct inode * dir, struct dentry * dentry, unsigned int flags)
48 struct inode * inode = NULL;
51 if (dentry->d_name.len > SYSV_NAMELEN)
52 return ERR_PTR(-ENAMETOOLONG);
53 ino = sysv_inode_by_name(dentry);
56 inode = sysv_iget(dir->i_sb, ino);
58 return ERR_CAST(inode);
64 static int sysv_mknod(struct inode * dir, struct dentry * dentry, umode_t mode, dev_t rdev)
69 if (!old_valid_dev(rdev))
72 inode = sysv_new_inode(dir, mode);
76 sysv_set_inode(inode, rdev);
77 mark_inode_dirty(inode);
78 err = add_nondir(dentry, inode);
83 static int sysv_create(struct inode * dir, struct dentry * dentry, umode_t mode, bool excl)
85 return sysv_mknod(dir, dentry, mode, 0);
88 static int sysv_symlink(struct inode * dir, struct dentry * dentry,
91 int err = -ENAMETOOLONG;
92 int l = strlen(symname)+1;
95 if (l > dir->i_sb->s_blocksize)
98 inode = sysv_new_inode(dir, S_IFLNK|0777);
103 sysv_set_inode(inode, 0);
104 err = page_symlink(inode, symname, l);
108 mark_inode_dirty(inode);
109 err = add_nondir(dentry, inode);
114 inode_dec_link_count(inode);
119 static int sysv_link(struct dentry * old_dentry, struct inode * dir,
120 struct dentry * dentry)
122 struct inode *inode = old_dentry->d_inode;
124 inode->i_ctime = CURRENT_TIME_SEC;
125 inode_inc_link_count(inode);
128 return add_nondir(dentry, inode);
131 static int sysv_mkdir(struct inode * dir, struct dentry *dentry, umode_t mode)
133 struct inode * inode;
136 inode_inc_link_count(dir);
138 inode = sysv_new_inode(dir, S_IFDIR|mode);
139 err = PTR_ERR(inode);
143 sysv_set_inode(inode, 0);
145 inode_inc_link_count(inode);
147 err = sysv_make_empty(inode, dir);
151 err = sysv_add_link(dentry, inode);
155 d_instantiate(dentry, inode);
160 inode_dec_link_count(inode);
161 inode_dec_link_count(inode);
164 inode_dec_link_count(dir);
168 static int sysv_unlink(struct inode * dir, struct dentry * dentry)
170 struct inode * inode = dentry->d_inode;
172 struct sysv_dir_entry * de;
175 de = sysv_find_entry(dentry, &page);
179 err = sysv_delete_entry (de, page);
183 inode->i_ctime = dir->i_ctime;
184 inode_dec_link_count(inode);
189 static int sysv_rmdir(struct inode * dir, struct dentry * dentry)
191 struct inode *inode = dentry->d_inode;
192 int err = -ENOTEMPTY;
194 if (sysv_empty_dir(inode)) {
195 err = sysv_unlink(dir, dentry);
198 inode_dec_link_count(inode);
199 inode_dec_link_count(dir);
206 * Anybody can rename anything with this: the permission checks are left to the
207 * higher-level routines.
209 static int sysv_rename(struct inode * old_dir, struct dentry * old_dentry,
210 struct inode * new_dir, struct dentry * new_dentry)
212 struct inode * old_inode = old_dentry->d_inode;
213 struct inode * new_inode = new_dentry->d_inode;
214 struct page * dir_page = NULL;
215 struct sysv_dir_entry * dir_de = NULL;
216 struct page * old_page;
217 struct sysv_dir_entry * old_de;
220 old_de = sysv_find_entry(old_dentry, &old_page);
224 if (S_ISDIR(old_inode->i_mode)) {
226 dir_de = sysv_dotdot(old_inode, &dir_page);
232 struct page * new_page;
233 struct sysv_dir_entry * new_de;
236 if (dir_de && !sysv_empty_dir(new_inode))
240 new_de = sysv_find_entry(new_dentry, &new_page);
243 sysv_set_link(new_de, new_page, old_inode);
244 new_inode->i_ctime = CURRENT_TIME_SEC;
246 drop_nlink(new_inode);
247 inode_dec_link_count(new_inode);
249 err = sysv_add_link(new_dentry, old_inode);
253 inode_inc_link_count(new_dir);
256 sysv_delete_entry(old_de, old_page);
257 mark_inode_dirty(old_inode);
260 sysv_set_link(dir_de, dir_page, new_dir);
261 inode_dec_link_count(old_dir);
268 page_cache_release(dir_page);
272 page_cache_release(old_page);
278 * directories can handle most operations...
280 const struct inode_operations sysv_dir_inode_operations = {
281 .create = sysv_create,
282 .lookup = sysv_lookup,
284 .unlink = sysv_unlink,
285 .symlink = sysv_symlink,
289 .rename = sysv_rename,
290 .getattr = sysv_getattr,