1 // SPDX-License-Identifier: GPL-2.0
4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
10 #include <linux/ctype.h>
11 #include <linux/posix_acl.h>
18 * fill_name_de - Format NTFS_DE in @buf.
20 int fill_name_de(struct ntfs_sb_info *sbi, void *buf, const struct qstr *name,
21 const struct cpu_str *uni)
24 struct NTFS_DE *e = buf;
26 struct ATTR_FILE_NAME *fname = (struct ATTR_FILE_NAME *)(e + 1);
28 #ifndef CONFIG_NTFS3_64BIT_CLUSTER
29 e->ref.high = fname->home.high = 0;
34 __le16 *uname = fname->name;
35 const u16 *name_cpu = uni->name;
38 *uname++ = cpu_to_le16(*name_cpu++);
40 memcpy(fname->name, uni->name, uni->len * sizeof(u16));
42 fname->name_len = uni->len;
45 /* Convert input string to unicode. */
46 err = ntfs_nls_to_utf16(sbi, name->name, name->len,
47 (struct cpu_str *)&fname->name_len,
48 NTFS_NAME_LEN, UTF16_LITTLE_ENDIAN);
53 fname->type = FILE_NAME_POSIX;
54 data_size = fname_full_size(fname);
56 e->size = cpu_to_le16(ALIGN(data_size, 8) + sizeof(struct NTFS_DE));
57 e->key_size = cpu_to_le16(data_size);
65 * ntfs_lookup - inode_operations::lookup
67 static struct dentry *ntfs_lookup(struct inode *dir, struct dentry *dentry,
70 struct ntfs_inode *ni = ntfs_i(dir);
71 struct cpu_str *uni = __getname();
76 inode = ERR_PTR(-ENOMEM);
78 err = ntfs_nls_to_utf16(ni->mi.sbi, dentry->d_name.name,
79 dentry->d_name.len, uni, NTFS_NAME_LEN,
85 inode = dir_search_u(dir, uni, NULL);
92 * Check for a null pointer
93 * If the MFT record of ntfs inode is not a base record, inode->i_op can be NULL.
94 * This causes null pointer dereference in d_splice_alias().
96 if (!IS_ERR_OR_NULL(inode) && !inode->i_op) {
98 inode = ERR_PTR(-EINVAL);
101 return d_splice_alias(inode, dentry);
105 * ntfs_create - inode_operations::create
107 static int ntfs_create(struct mnt_idmap *idmap, struct inode *dir,
108 struct dentry *dentry, umode_t mode, bool excl)
112 inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFREG | mode, 0,
115 return IS_ERR(inode) ? PTR_ERR(inode) : 0;
121 * inode_operations::mknod
123 static int ntfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
124 struct dentry *dentry, umode_t mode, dev_t rdev)
128 inode = ntfs_create_inode(idmap, dir, dentry, NULL, mode, rdev, NULL, 0,
131 return IS_ERR(inode) ? PTR_ERR(inode) : 0;
135 * ntfs_link - inode_operations::link
137 static int ntfs_link(struct dentry *ode, struct inode *dir, struct dentry *de)
140 struct inode *inode = d_inode(ode);
141 struct ntfs_inode *ni = ntfs_i(inode);
143 if (S_ISDIR(inode->i_mode))
146 if (inode->i_nlink >= NTFS_LINK_MAX)
149 ni_lock_dir(ntfs_i(dir));
156 err = ntfs_link_inode(inode, de);
159 inode_set_ctime_current(inode);
160 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
161 mark_inode_dirty(inode);
162 mark_inode_dirty(dir);
163 d_instantiate(de, inode);
171 ni_unlock(ntfs_i(dir));
177 * ntfs_unlink - inode_operations::unlink
179 static int ntfs_unlink(struct inode *dir, struct dentry *dentry)
181 struct ntfs_inode *ni = ntfs_i(dir);
184 if (unlikely(ntfs3_forced_shutdown(dir->i_sb)))
189 err = ntfs_unlink_inode(dir, dentry);
197 * ntfs_symlink - inode_operations::symlink
199 static int ntfs_symlink(struct mnt_idmap *idmap, struct inode *dir,
200 struct dentry *dentry, const char *symname)
202 u32 size = strlen(symname);
205 if (unlikely(ntfs3_forced_shutdown(dir->i_sb)))
208 inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFLNK | 0777, 0,
209 symname, size, NULL);
211 return IS_ERR(inode) ? PTR_ERR(inode) : 0;
215 * ntfs_mkdir- inode_operations::mkdir
217 static int ntfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
218 struct dentry *dentry, umode_t mode)
222 inode = ntfs_create_inode(idmap, dir, dentry, NULL, S_IFDIR | mode, 0,
225 return IS_ERR(inode) ? PTR_ERR(inode) : 0;
229 * ntfs_rmdir - inode_operations::rmdir
231 static int ntfs_rmdir(struct inode *dir, struct dentry *dentry)
233 struct ntfs_inode *ni = ntfs_i(dir);
236 if (unlikely(ntfs3_forced_shutdown(dir->i_sb)))
241 err = ntfs_unlink_inode(dir, dentry);
249 * ntfs_rename - inode_operations::rename
251 static int ntfs_rename(struct mnt_idmap *idmap, struct inode *dir,
252 struct dentry *dentry, struct inode *new_dir,
253 struct dentry *new_dentry, u32 flags)
256 struct super_block *sb = dir->i_sb;
257 struct ntfs_sb_info *sbi = sb->s_fs_info;
258 struct ntfs_inode *dir_ni = ntfs_i(dir);
259 struct ntfs_inode *new_dir_ni = ntfs_i(new_dir);
260 struct inode *inode = d_inode(dentry);
261 struct ntfs_inode *ni = ntfs_i(inode);
262 struct inode *new_inode = d_inode(new_dentry);
263 struct NTFS_DE *de, *new_de;
264 bool is_same, is_bad;
266 * de - memory of PATH_MAX bytes:
267 * [0-1024) - original name (dentry->d_name)
268 * [1024-2048) - paired to original name, usually DOS variant of dentry->d_name
269 * [2048-3072) - new name (new_dentry->d_name)
271 static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + SIZEOF_RESIDENT < 1024);
272 static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + sizeof(struct NTFS_DE) <
274 static_assert(PATH_MAX >= 4 * 1024);
276 if (unlikely(ntfs3_forced_shutdown(sb)))
279 if (flags & ~RENAME_NOREPLACE)
282 is_same = dentry->d_name.len == new_dentry->d_name.len &&
283 !memcmp(dentry->d_name.name, new_dentry->d_name.name,
286 if (is_same && dir == new_dir) {
291 if (ntfs_is_meta_file(sbi, inode->i_ino)) {
292 /* Should we print an error? */
297 /* Target name exists. Unlink it. */
299 ni_lock_dir(new_dir_ni);
300 err = ntfs_unlink_inode(new_dir, new_dentry);
301 ni_unlock(new_dir_ni);
307 /* Allocate PATH_MAX bytes. */
312 /* Translate dentry->d_name into unicode form. */
313 err = fill_name_de(sbi, de, &dentry->d_name, NULL);
321 /* Translate new_dentry->d_name into unicode form. */
322 new_de = Add2Ptr(de, 2048);
323 err = fill_name_de(sbi, new_de, &new_dentry->d_name, NULL);
330 if (dir_ni != new_dir_ni)
331 ni_lock_dir2(new_dir_ni);
334 err = ni_rename(dir_ni, new_dir_ni, ni, de, new_de, &is_bad);
336 /* Restore after failed rename failed too. */
337 _ntfs_bad_inode(inode);
339 simple_rename_timestamp(dir, dentry, new_dir, new_dentry);
340 mark_inode_dirty(inode);
341 mark_inode_dirty(dir);
343 mark_inode_dirty(new_dir);
346 ntfs_sync_inode(dir);
348 if (IS_DIRSYNC(new_dir))
349 ntfs_sync_inode(inode);
352 if (dir_ni != new_dir_ni)
353 ni_unlock(new_dir_ni);
364 * inode_operations::atomic_open
366 static int ntfs_atomic_open(struct inode *dir, struct dentry *dentry,
367 struct file *file, u32 flags, umode_t mode)
371 struct ntfs_fnd *fnd = NULL;
372 struct ntfs_inode *ni = ntfs_i(dir);
373 struct dentry *d = NULL;
374 struct cpu_str *uni = __getname();
380 err = ntfs_nls_to_utf16(ni->mi.sbi, dentry->d_name.name,
381 dentry->d_name.len, uni, NTFS_NAME_LEN,
386 #ifdef CONFIG_NTFS3_FS_POSIX_ACL
387 if (IS_POSIXACL(dir)) {
389 * Load in cache current acl to avoid ni_lock(dir):
390 * ntfs_create_inode -> ntfs_init_acl -> posix_acl_create ->
391 * ntfs_get_acl -> ntfs_get_acl_ex -> ni_lock
393 struct posix_acl *p = get_inode_acl(dir, ACL_TYPE_DEFAULT);
399 posix_acl_release(p);
403 if (d_in_lookup(dentry)) {
412 d = d_splice_alias(dir_search_u(dir, uni, fnd), dentry);
423 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) {
424 err = finish_no_open(file, d);
428 file->f_mode |= FMODE_CREATED;
431 * fnd contains tree's path to insert to.
432 * If fnd is not NULL then dir is locked.
434 inode = ntfs_create_inode(file_mnt_idmap(file), dir, dentry, uni,
435 mode, 0, NULL, 0, fnd);
436 err = IS_ERR(inode) ? PTR_ERR(inode) :
437 finish_open(file, dentry, ntfs_file_open);
450 struct dentry *ntfs3_get_parent(struct dentry *child)
452 struct inode *inode = d_inode(child);
453 struct ntfs_inode *ni = ntfs_i(inode);
455 struct ATTR_LIST_ENTRY *le = NULL;
456 struct ATTRIB *attr = NULL;
457 struct ATTR_FILE_NAME *fname;
459 while ((attr = ni_find_attr(ni, attr, &le, ATTR_NAME, NULL, 0, NULL,
461 fname = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME);
465 return d_obtain_alias(
466 ntfs_iget5(inode->i_sb, &fname->home, NULL));
469 return ERR_PTR(-ENOENT);
473 * dentry_operations::d_hash
475 static int ntfs_d_hash(const struct dentry *dentry, struct qstr *name)
477 struct ntfs_sb_info *sbi;
478 const char *n = name->name;
479 unsigned int len = name->len;
485 /* First try fast implementation. */
486 hash = init_name_hash(dentry);
490 name->hash = end_name_hash(hash);
498 hash = partial_name_hash(toupper(c), hash);
502 * Try slow way with current upcase table
508 sbi = dentry->d_sb->s_fs_info;
510 err = ntfs_nls_to_utf16(sbi, name->name, name->len, uni, NTFS_NAME_LEN,
520 hash = ntfs_names_hash(uni->name, uni->len, sbi->upcase,
521 init_name_hash(dentry));
522 name->hash = end_name_hash(hash);
531 * dentry_operations::d_compare
533 static int ntfs_d_compare(const struct dentry *dentry, unsigned int len1,
534 const char *str, const struct qstr *name)
536 struct ntfs_sb_info *sbi;
538 const char *n1 = str;
539 const char *n2 = name->name;
540 unsigned int len2 = name->len;
541 unsigned int lm = min(len1, len2);
542 unsigned char c1, c2;
543 struct cpu_str *uni1;
546 /* First try fast implementation. */
551 if ((c1 = *n1++) == (c2 = *n2++))
554 if (c1 >= 0x80 || c2 >= 0x80)
557 if (toupper(c1) != toupper(c2))
562 * Try slow way with current upcase table
564 sbi = dentry->d_sb->s_fs_info;
569 ret = ntfs_nls_to_utf16(sbi, str, len1, uni1, NTFS_NAME_LEN,
579 uni2 = Add2Ptr(uni1, 2048);
581 ret = ntfs_nls_to_utf16(sbi, name->name, name->len,
582 (struct cpu_str *)uni2, NTFS_NAME_LEN,
583 UTF16_LITTLE_ENDIAN);
592 ret = !ntfs_cmp_names_cpu(uni1, uni2, sbi->upcase, false) ? 0 : 1;
600 const struct inode_operations ntfs_dir_inode_operations = {
601 .lookup = ntfs_lookup,
602 .create = ntfs_create,
604 .unlink = ntfs_unlink,
605 .symlink = ntfs_symlink,
609 .rename = ntfs_rename,
610 .get_acl = ntfs_get_acl,
611 .set_acl = ntfs_set_acl,
612 .setattr = ntfs3_setattr,
613 .getattr = ntfs_getattr,
614 .listxattr = ntfs_listxattr,
615 .atomic_open = ntfs_atomic_open,
616 .fiemap = ntfs_fiemap,
619 const struct inode_operations ntfs_special_inode_operations = {
620 .setattr = ntfs3_setattr,
621 .getattr = ntfs_getattr,
622 .listxattr = ntfs_listxattr,
623 .get_acl = ntfs_get_acl,
624 .set_acl = ntfs_set_acl,
627 const struct dentry_operations ntfs_dentry_ops = {
628 .d_hash = ntfs_d_hash,
629 .d_compare = ntfs_d_compare,