1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * 4 * Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved. 5 * 6 */ 7 8 #include <linux/fs.h> 9 #include <linux/nls.h> 10 11 #include "debug.h" 12 #include "ntfs.h" 13 #include "ntfs_fs.h" 14 15 /* 16 * fill_name_de - Format NTFS_DE in @buf. 17 */ 18 int fill_name_de(struct ntfs_sb_info *sbi, void *buf, const struct qstr *name, 19 const struct cpu_str *uni) 20 { 21 int err; 22 struct NTFS_DE *e = buf; 23 u16 data_size; 24 struct ATTR_FILE_NAME *fname = (struct ATTR_FILE_NAME *)(e + 1); 25 26 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 27 e->ref.high = fname->home.high = 0; 28 #endif 29 if (uni) { 30 #ifdef __BIG_ENDIAN 31 int ulen = uni->len; 32 __le16 *uname = fname->name; 33 const u16 *name_cpu = uni->name; 34 35 while (ulen--) 36 *uname++ = cpu_to_le16(*name_cpu++); 37 #else 38 memcpy(fname->name, uni->name, uni->len * sizeof(u16)); 39 #endif 40 fname->name_len = uni->len; 41 42 } else { 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); 47 if (err < 0) 48 return err; 49 } 50 51 fname->type = FILE_NAME_POSIX; 52 data_size = fname_full_size(fname); 53 54 e->size = cpu_to_le16(ALIGN(data_size, 8) + sizeof(struct NTFS_DE)); 55 e->key_size = cpu_to_le16(data_size); 56 e->flags = 0; 57 e->res = 0; 58 59 return 0; 60 } 61 62 /* 63 * ntfs_lookup - inode_operations::lookup 64 */ 65 static struct dentry *ntfs_lookup(struct inode *dir, struct dentry *dentry, 66 u32 flags) 67 { 68 struct ntfs_inode *ni = ntfs_i(dir); 69 struct cpu_str *uni = __getname(); 70 struct inode *inode; 71 int err; 72 73 if (!uni) 74 inode = ERR_PTR(-ENOMEM); 75 else { 76 err = ntfs_nls_to_utf16(ni->mi.sbi, dentry->d_name.name, 77 dentry->d_name.len, uni, NTFS_NAME_LEN, 78 UTF16_HOST_ENDIAN); 79 if (err < 0) 80 inode = ERR_PTR(err); 81 else { 82 ni_lock(ni); 83 inode = dir_search_u(dir, uni, NULL); 84 ni_unlock(ni); 85 } 86 __putname(uni); 87 } 88 89 return d_splice_alias(inode, dentry); 90 } 91 92 /* 93 * ntfs_create - inode_operations::create 94 */ 95 static int ntfs_create(struct user_namespace *mnt_userns, struct inode *dir, 96 struct dentry *dentry, umode_t mode, bool excl) 97 { 98 struct inode *inode; 99 100 inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, S_IFREG | mode, 101 0, NULL, 0, NULL); 102 103 return IS_ERR(inode) ? PTR_ERR(inode) : 0; 104 } 105 106 /* 107 * ntfs_mknod 108 * 109 * inode_operations::mknod 110 */ 111 static int ntfs_mknod(struct user_namespace *mnt_userns, struct inode *dir, 112 struct dentry *dentry, umode_t mode, dev_t rdev) 113 { 114 struct inode *inode; 115 116 inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, mode, rdev, 117 NULL, 0, NULL); 118 119 return IS_ERR(inode) ? PTR_ERR(inode) : 0; 120 } 121 122 /* 123 * ntfs_link - inode_operations::link 124 */ 125 static int ntfs_link(struct dentry *ode, struct inode *dir, struct dentry *de) 126 { 127 int err; 128 struct inode *inode = d_inode(ode); 129 struct ntfs_inode *ni = ntfs_i(inode); 130 131 if (S_ISDIR(inode->i_mode)) 132 return -EPERM; 133 134 if (inode->i_nlink >= NTFS_LINK_MAX) 135 return -EMLINK; 136 137 ni_lock_dir(ntfs_i(dir)); 138 if (inode != dir) 139 ni_lock(ni); 140 141 inc_nlink(inode); 142 ihold(inode); 143 144 err = ntfs_link_inode(inode, de); 145 146 if (!err) { 147 dir->i_ctime = dir->i_mtime = inode->i_ctime = 148 current_time(dir); 149 mark_inode_dirty(inode); 150 mark_inode_dirty(dir); 151 d_instantiate(de, inode); 152 } else { 153 drop_nlink(inode); 154 iput(inode); 155 } 156 157 if (inode != dir) 158 ni_unlock(ni); 159 ni_unlock(ntfs_i(dir)); 160 161 return err; 162 } 163 164 /* 165 * ntfs_unlink - inode_operations::unlink 166 */ 167 static int ntfs_unlink(struct inode *dir, struct dentry *dentry) 168 { 169 struct ntfs_inode *ni = ntfs_i(dir); 170 int err; 171 172 ni_lock_dir(ni); 173 174 err = ntfs_unlink_inode(dir, dentry); 175 176 ni_unlock(ni); 177 178 return err; 179 } 180 181 /* 182 * ntfs_symlink - inode_operations::symlink 183 */ 184 static int ntfs_symlink(struct user_namespace *mnt_userns, struct inode *dir, 185 struct dentry *dentry, const char *symname) 186 { 187 u32 size = strlen(symname); 188 struct inode *inode; 189 190 inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, S_IFLNK | 0777, 191 0, symname, size, NULL); 192 193 return IS_ERR(inode) ? PTR_ERR(inode) : 0; 194 } 195 196 /* 197 * ntfs_mkdir- inode_operations::mkdir 198 */ 199 static int ntfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 200 struct dentry *dentry, umode_t mode) 201 { 202 struct inode *inode; 203 204 inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, S_IFDIR | mode, 205 0, NULL, 0, NULL); 206 207 return IS_ERR(inode) ? PTR_ERR(inode) : 0; 208 } 209 210 /* 211 * ntfs_rmdir - inode_operations::rm_dir 212 */ 213 static int ntfs_rmdir(struct inode *dir, struct dentry *dentry) 214 { 215 struct ntfs_inode *ni = ntfs_i(dir); 216 int err; 217 218 ni_lock_dir(ni); 219 220 err = ntfs_unlink_inode(dir, dentry); 221 222 ni_unlock(ni); 223 224 return err; 225 } 226 227 /* 228 * ntfs_rename - inode_operations::rename 229 */ 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) 233 { 234 int err; 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; 244 /* 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) 249 */ 250 static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + SIZEOF_RESIDENT < 1024); 251 static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + sizeof(struct NTFS_DE) < 252 1024); 253 static_assert(PATH_MAX >= 4 * 1024); 254 255 if (flags & ~RENAME_NOREPLACE) 256 return -EINVAL; 257 258 is_same = dentry->d_name.len == new_dentry->d_name.len && 259 !memcmp(dentry->d_name.name, new_dentry->d_name.name, 260 dentry->d_name.len); 261 262 if (is_same && dir == new_dir) { 263 /* Nothing to do. */ 264 return 0; 265 } 266 267 if (ntfs_is_meta_file(sbi, inode->i_ino)) { 268 /* Should we print an error? */ 269 return -EINVAL; 270 } 271 272 if (new_inode) { 273 /* Target name exists. Unlink it. */ 274 dget(new_dentry); 275 ni_lock_dir(new_dir_ni); 276 err = ntfs_unlink_inode(new_dir, new_dentry); 277 ni_unlock(new_dir_ni); 278 dput(new_dentry); 279 if (err) 280 return err; 281 } 282 283 /* Allocate PATH_MAX bytes. */ 284 de = __getname(); 285 if (!de) 286 return -ENOMEM; 287 288 /* Translate dentry->d_name into unicode form. */ 289 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 290 if (err < 0) 291 goto out; 292 293 if (is_same) { 294 /* Reuse 'de'. */ 295 new_de = de; 296 } else { 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); 300 if (err < 0) 301 goto out; 302 } 303 304 ni_lock_dir(dir_ni); 305 ni_lock(ni); 306 307 is_bad = false; 308 err = ni_rename(dir_ni, new_dir_ni, ni, de, new_de, &is_bad); 309 if (is_bad) { 310 /* Restore after failed rename failed too. */ 311 make_bad_inode(inode); 312 ntfs_inode_err(inode, "failed to undo rename"); 313 ntfs_set_state(sbi, NTFS_DIRTY_ERROR); 314 } else if (!err) { 315 inode->i_ctime = dir->i_ctime = dir->i_mtime = 316 current_time(dir); 317 mark_inode_dirty(inode); 318 mark_inode_dirty(dir); 319 if (dir != new_dir) { 320 new_dir->i_mtime = new_dir->i_ctime = dir->i_ctime; 321 mark_inode_dirty(new_dir); 322 } 323 324 if (IS_DIRSYNC(dir)) 325 ntfs_sync_inode(dir); 326 327 if (IS_DIRSYNC(new_dir)) 328 ntfs_sync_inode(inode); 329 } 330 331 ni_unlock(ni); 332 ni_unlock(dir_ni); 333 out: 334 __putname(de); 335 return err; 336 } 337 338 struct dentry *ntfs3_get_parent(struct dentry *child) 339 { 340 struct inode *inode = d_inode(child); 341 struct ntfs_inode *ni = ntfs_i(inode); 342 343 struct ATTR_LIST_ENTRY *le = NULL; 344 struct ATTRIB *attr = NULL; 345 struct ATTR_FILE_NAME *fname; 346 347 while ((attr = ni_find_attr(ni, attr, &le, ATTR_NAME, NULL, 0, NULL, 348 NULL))) { 349 fname = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME); 350 if (!fname) 351 continue; 352 353 return d_obtain_alias( 354 ntfs_iget5(inode->i_sb, &fname->home, NULL)); 355 } 356 357 return ERR_PTR(-ENOENT); 358 } 359 360 // clang-format off 361 const struct inode_operations ntfs_dir_inode_operations = { 362 .lookup = ntfs_lookup, 363 .create = ntfs_create, 364 .link = ntfs_link, 365 .unlink = ntfs_unlink, 366 .symlink = ntfs_symlink, 367 .mkdir = ntfs_mkdir, 368 .rmdir = ntfs_rmdir, 369 .mknod = ntfs_mknod, 370 .rename = ntfs_rename, 371 .permission = ntfs_permission, 372 .get_acl = ntfs_get_acl, 373 .set_acl = ntfs_set_acl, 374 .setattr = ntfs3_setattr, 375 .getattr = ntfs_getattr, 376 .listxattr = ntfs_listxattr, 377 .fiemap = ntfs_fiemap, 378 }; 379 380 const struct inode_operations ntfs_special_inode_operations = { 381 .setattr = ntfs3_setattr, 382 .getattr = ntfs_getattr, 383 .listxattr = ntfs_listxattr, 384 .get_acl = ntfs_get_acl, 385 .set_acl = ntfs_set_acl, 386 }; 387 // clang-format on 388