1 // SPDX-License-Identifier: GPL-2.0
4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
16 * fill_name_de - Format NTFS_DE in @buf.
18 int fill_name_de(struct ntfs_sb_info *sbi, void *buf, const struct qstr *name,
19 const struct cpu_str *uni)
22 struct NTFS_DE *e = buf;
24 struct ATTR_FILE_NAME *fname = (struct ATTR_FILE_NAME *)(e + 1);
26 #ifndef CONFIG_NTFS3_64BIT_CLUSTER
27 e->ref.high = fname->home.high = 0;
32 __le16 *uname = fname->name;
33 const u16 *name_cpu = uni->name;
36 *uname++ = cpu_to_le16(*name_cpu++);
38 memcpy(fname->name, uni->name, uni->len * sizeof(u16));
40 fname->name_len = uni->len;
43 /* Convert input string to unicode. */
44 err = ntfs_nls_to_utf16(sbi, name->name, name->len,
45 (struct cpu_str *)&fname->name_len,
46 NTFS_NAME_LEN, UTF16_LITTLE_ENDIAN);
51 fname->type = FILE_NAME_POSIX;
52 data_size = fname_full_size(fname);
54 e->size = cpu_to_le16(ALIGN(data_size, 8) + sizeof(struct NTFS_DE));
55 e->key_size = cpu_to_le16(data_size);
63 * ntfs_lookup - inode_operations::lookup
65 static struct dentry *ntfs_lookup(struct inode *dir, struct dentry *dentry,
68 struct ntfs_inode *ni = ntfs_i(dir);
69 struct cpu_str *uni = __getname();
74 inode = ERR_PTR(-ENOMEM);
76 err = ntfs_nls_to_utf16(ni->mi.sbi, dentry->d_name.name,
77 dentry->d_name.len, uni, NTFS_NAME_LEN,
83 inode = dir_search_u(dir, uni, NULL);
89 return d_splice_alias(inode, dentry);
93 * ntfs_create - inode_operations::create
95 static int ntfs_create(struct user_namespace *mnt_userns, struct inode *dir,
96 struct dentry *dentry, umode_t mode, bool excl)
100 inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, S_IFREG | mode,
103 return IS_ERR(inode) ? PTR_ERR(inode) : 0;
109 * inode_operations::mknod
111 static int ntfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
112 struct dentry *dentry, umode_t mode, dev_t rdev)
116 inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, mode, rdev,
119 return IS_ERR(inode) ? PTR_ERR(inode) : 0;
123 * ntfs_link - inode_operations::link
125 static int ntfs_link(struct dentry *ode, struct inode *dir, struct dentry *de)
128 struct inode *inode = d_inode(ode);
129 struct ntfs_inode *ni = ntfs_i(inode);
131 if (S_ISDIR(inode->i_mode))
134 if (inode->i_nlink >= NTFS_LINK_MAX)
137 ni_lock_dir(ntfs_i(dir));
144 err = ntfs_link_inode(inode, de);
147 dir->i_ctime = dir->i_mtime = inode->i_ctime =
149 mark_inode_dirty(inode);
150 mark_inode_dirty(dir);
151 d_instantiate(de, inode);
159 ni_unlock(ntfs_i(dir));
165 * ntfs_unlink - inode_operations::unlink
167 static int ntfs_unlink(struct inode *dir, struct dentry *dentry)
169 struct ntfs_inode *ni = ntfs_i(dir);
174 err = ntfs_unlink_inode(dir, dentry);
182 * ntfs_symlink - inode_operations::symlink
184 static int ntfs_symlink(struct user_namespace *mnt_userns, struct inode *dir,
185 struct dentry *dentry, const char *symname)
187 u32 size = strlen(symname);
190 inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, S_IFLNK | 0777,
191 0, symname, size, NULL);
193 return IS_ERR(inode) ? PTR_ERR(inode) : 0;
197 * ntfs_mkdir- inode_operations::mkdir
199 static int ntfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
200 struct dentry *dentry, umode_t mode)
204 inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, S_IFDIR | mode,
207 return IS_ERR(inode) ? PTR_ERR(inode) : 0;
211 * ntfs_rmdir - inode_operations::rmdir
213 static int ntfs_rmdir(struct inode *dir, struct dentry *dentry)
215 struct ntfs_inode *ni = ntfs_i(dir);
220 err = ntfs_unlink_inode(dir, dentry);
228 * ntfs_rename - inode_operations::rename
230 static int ntfs_rename(struct user_namespace *mnt_userns, struct inode *dir,
231 struct dentry *dentry, struct inode *new_dir,
232 struct dentry *new_dentry, u32 flags)
235 struct super_block *sb = dir->i_sb;
236 struct ntfs_sb_info *sbi = sb->s_fs_info;
237 struct ntfs_inode *dir_ni = ntfs_i(dir);
238 struct ntfs_inode *new_dir_ni = ntfs_i(new_dir);
239 struct inode *inode = d_inode(dentry);
240 struct ntfs_inode *ni = ntfs_i(inode);
241 struct inode *new_inode = d_inode(new_dentry);
242 struct NTFS_DE *de, *new_de;
243 bool is_same, is_bad;
245 * de - memory of PATH_MAX bytes:
246 * [0-1024) - original name (dentry->d_name)
247 * [1024-2048) - paired to original name, usually DOS variant of dentry->d_name
248 * [2048-3072) - new name (new_dentry->d_name)
250 static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + SIZEOF_RESIDENT < 1024);
251 static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + sizeof(struct NTFS_DE) <
253 static_assert(PATH_MAX >= 4 * 1024);
255 if (flags & ~RENAME_NOREPLACE)
258 is_same = dentry->d_name.len == new_dentry->d_name.len &&
259 !memcmp(dentry->d_name.name, new_dentry->d_name.name,
262 if (is_same && dir == new_dir) {
267 if (ntfs_is_meta_file(sbi, inode->i_ino)) {
268 /* Should we print an error? */
273 /* Target name exists. Unlink it. */
275 ni_lock_dir(new_dir_ni);
276 err = ntfs_unlink_inode(new_dir, new_dentry);
277 ni_unlock(new_dir_ni);
283 /* Allocate PATH_MAX bytes. */
288 /* Translate dentry->d_name into unicode form. */
289 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
297 /* Translate new_dentry->d_name into unicode form. */
298 new_de = Add2Ptr(de, 2048);
299 err = fill_name_de(sbi, new_de, &new_dentry->d_name, NULL);
308 err = ni_rename(dir_ni, new_dir_ni, ni, de, new_de, &is_bad);
310 /* Restore after failed rename failed too. */
311 _ntfs_bad_inode(inode);
313 inode->i_ctime = dir->i_ctime = dir->i_mtime =
315 mark_inode_dirty(inode);
316 mark_inode_dirty(dir);
317 if (dir != new_dir) {
318 new_dir->i_mtime = new_dir->i_ctime = dir->i_ctime;
319 mark_inode_dirty(new_dir);
323 ntfs_sync_inode(dir);
325 if (IS_DIRSYNC(new_dir))
326 ntfs_sync_inode(inode);
336 struct dentry *ntfs3_get_parent(struct dentry *child)
338 struct inode *inode = d_inode(child);
339 struct ntfs_inode *ni = ntfs_i(inode);
341 struct ATTR_LIST_ENTRY *le = NULL;
342 struct ATTRIB *attr = NULL;
343 struct ATTR_FILE_NAME *fname;
345 while ((attr = ni_find_attr(ni, attr, &le, ATTR_NAME, NULL, 0, NULL,
347 fname = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
351 return d_obtain_alias(
352 ntfs_iget5(inode->i_sb, &fname->home, NULL));
355 return ERR_PTR(-ENOENT);
359 const struct inode_operations ntfs_dir_inode_operations = {
360 .lookup = ntfs_lookup,
361 .create = ntfs_create,
363 .unlink = ntfs_unlink,
364 .symlink = ntfs_symlink,
368 .rename = ntfs_rename,
369 .permission = ntfs_permission,
370 .get_acl = ntfs_get_acl,
371 .set_acl = ntfs_set_acl,
372 .setattr = ntfs3_setattr,
373 .getattr = ntfs_getattr,
374 .listxattr = ntfs_listxattr,
375 .fiemap = ntfs_fiemap,
378 const struct inode_operations ntfs_special_inode_operations = {
379 .setattr = ntfs3_setattr,
380 .getattr = ntfs_getattr,
381 .listxattr = ntfs_listxattr,
382 .get_acl = ntfs_get_acl,
383 .set_acl = ntfs_set_acl,