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/blkdev.h> 9 #include <linux/buffer_head.h> 10 #include <linux/fs.h> 11 #include <linux/iversion.h> 12 #include <linux/namei.h> 13 #include <linux/nls.h> 14 15 #include "debug.h" 16 #include "ntfs.h" 17 #include "ntfs_fs.h" 18 19 /* 20 * fill_name_de - Format NTFS_DE in @buf. 21 */ 22 int fill_name_de(struct ntfs_sb_info *sbi, void *buf, const struct qstr *name, 23 const struct cpu_str *uni) 24 { 25 int err; 26 struct NTFS_DE *e = buf; 27 u16 data_size; 28 struct ATTR_FILE_NAME *fname = (struct ATTR_FILE_NAME *)(e + 1); 29 30 #ifndef CONFIG_NTFS3_64BIT_CLUSTER 31 e->ref.high = fname->home.high = 0; 32 #endif 33 if (uni) { 34 #ifdef __BIG_ENDIAN 35 int ulen = uni->len; 36 __le16 *uname = fname->name; 37 const u16 *name_cpu = uni->name; 38 39 while (ulen--) 40 *uname++ = cpu_to_le16(*name_cpu++); 41 #else 42 memcpy(fname->name, uni->name, uni->len * sizeof(u16)); 43 #endif 44 fname->name_len = uni->len; 45 46 } else { 47 /* Convert input string to unicode. */ 48 err = ntfs_nls_to_utf16(sbi, name->name, name->len, 49 (struct cpu_str *)&fname->name_len, 50 NTFS_NAME_LEN, UTF16_LITTLE_ENDIAN); 51 if (err < 0) 52 return err; 53 } 54 55 fname->type = FILE_NAME_POSIX; 56 data_size = fname_full_size(fname); 57 58 e->size = cpu_to_le16(ALIGN(data_size, 8) + sizeof(struct NTFS_DE)); 59 e->key_size = cpu_to_le16(data_size); 60 e->flags = 0; 61 e->res = 0; 62 63 return 0; 64 } 65 66 /* 67 * ntfs_lookup - inode_operations::lookup 68 */ 69 static struct dentry *ntfs_lookup(struct inode *dir, struct dentry *dentry, 70 u32 flags) 71 { 72 struct ntfs_inode *ni = ntfs_i(dir); 73 struct cpu_str *uni = __getname(); 74 struct inode *inode; 75 int err; 76 77 if (!uni) 78 inode = ERR_PTR(-ENOMEM); 79 else { 80 err = ntfs_nls_to_utf16(ni->mi.sbi, dentry->d_name.name, 81 dentry->d_name.len, uni, NTFS_NAME_LEN, 82 UTF16_HOST_ENDIAN); 83 if (err < 0) 84 inode = ERR_PTR(err); 85 else { 86 ni_lock(ni); 87 inode = dir_search_u(dir, uni, NULL); 88 ni_unlock(ni); 89 } 90 __putname(uni); 91 } 92 93 return d_splice_alias(inode, dentry); 94 } 95 96 /* 97 * ntfs_create - inode_operations::create 98 */ 99 static int ntfs_create(struct user_namespace *mnt_userns, struct inode *dir, 100 struct dentry *dentry, umode_t mode, bool excl) 101 { 102 struct ntfs_inode *ni = ntfs_i(dir); 103 struct inode *inode; 104 105 ni_lock_dir(ni); 106 107 inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, S_IFREG | mode, 108 0, NULL, 0, NULL); 109 110 ni_unlock(ni); 111 112 return IS_ERR(inode) ? PTR_ERR(inode) : 0; 113 } 114 115 /* 116 * ntfs_mknod 117 * 118 * inode_operations::mknod 119 */ 120 static int ntfs_mknod(struct user_namespace *mnt_userns, struct inode *dir, 121 struct dentry *dentry, umode_t mode, dev_t rdev) 122 { 123 struct ntfs_inode *ni = ntfs_i(dir); 124 struct inode *inode; 125 126 ni_lock_dir(ni); 127 128 inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, mode, rdev, 129 NULL, 0, NULL); 130 131 ni_unlock(ni); 132 133 return IS_ERR(inode) ? PTR_ERR(inode) : 0; 134 } 135 136 /* 137 * ntfs_link - inode_operations::link 138 */ 139 static int ntfs_link(struct dentry *ode, struct inode *dir, struct dentry *de) 140 { 141 int err; 142 struct inode *inode = d_inode(ode); 143 struct ntfs_inode *ni = ntfs_i(inode); 144 145 if (S_ISDIR(inode->i_mode)) 146 return -EPERM; 147 148 if (inode->i_nlink >= NTFS_LINK_MAX) 149 return -EMLINK; 150 151 ni_lock_dir(ntfs_i(dir)); 152 if (inode != dir) 153 ni_lock(ni); 154 155 inc_nlink(inode); 156 ihold(inode); 157 158 err = ntfs_link_inode(inode, de); 159 160 if (!err) { 161 dir->i_ctime = dir->i_mtime = inode->i_ctime = 162 current_time(dir); 163 mark_inode_dirty(inode); 164 mark_inode_dirty(dir); 165 d_instantiate(de, inode); 166 } else { 167 drop_nlink(inode); 168 iput(inode); 169 } 170 171 if (inode != dir) 172 ni_unlock(ni); 173 ni_unlock(ntfs_i(dir)); 174 175 return err; 176 } 177 178 /* 179 * ntfs_unlink - inode_operations::unlink 180 */ 181 static int ntfs_unlink(struct inode *dir, struct dentry *dentry) 182 { 183 struct ntfs_inode *ni = ntfs_i(dir); 184 int err; 185 186 ni_lock_dir(ni); 187 188 err = ntfs_unlink_inode(dir, dentry); 189 190 ni_unlock(ni); 191 192 return err; 193 } 194 195 /* 196 * ntfs_symlink - inode_operations::symlink 197 */ 198 static int ntfs_symlink(struct user_namespace *mnt_userns, struct inode *dir, 199 struct dentry *dentry, const char *symname) 200 { 201 u32 size = strlen(symname); 202 struct inode *inode; 203 struct ntfs_inode *ni = ntfs_i(dir); 204 205 ni_lock_dir(ni); 206 207 inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, S_IFLNK | 0777, 208 0, symname, size, NULL); 209 210 ni_unlock(ni); 211 212 return IS_ERR(inode) ? PTR_ERR(inode) : 0; 213 } 214 215 /* 216 * ntfs_mkdir- inode_operations::mkdir 217 */ 218 static int ntfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 219 struct dentry *dentry, umode_t mode) 220 { 221 struct inode *inode; 222 struct ntfs_inode *ni = ntfs_i(dir); 223 224 ni_lock_dir(ni); 225 226 inode = ntfs_create_inode(mnt_userns, dir, dentry, NULL, S_IFDIR | mode, 227 0, NULL, 0, NULL); 228 229 ni_unlock(ni); 230 231 return IS_ERR(inode) ? PTR_ERR(inode) : 0; 232 } 233 234 /* 235 * ntfs_rmdir - inode_operations::rm_dir 236 */ 237 static int ntfs_rmdir(struct inode *dir, struct dentry *dentry) 238 { 239 struct ntfs_inode *ni = ntfs_i(dir); 240 int err; 241 242 ni_lock_dir(ni); 243 244 err = ntfs_unlink_inode(dir, dentry); 245 246 ni_unlock(ni); 247 248 return err; 249 } 250 251 /* 252 * ntfs_rename - inode_operations::rename 253 */ 254 static int ntfs_rename(struct user_namespace *mnt_userns, struct inode *dir, 255 struct dentry *dentry, struct inode *new_dir, 256 struct dentry *new_dentry, u32 flags) 257 { 258 int err; 259 struct super_block *sb = dir->i_sb; 260 struct ntfs_sb_info *sbi = sb->s_fs_info; 261 struct ntfs_inode *dir_ni = ntfs_i(dir); 262 struct ntfs_inode *new_dir_ni = ntfs_i(new_dir); 263 struct inode *inode = d_inode(dentry); 264 struct ntfs_inode *ni = ntfs_i(inode); 265 struct inode *new_inode = d_inode(new_dentry); 266 struct NTFS_DE *de, *new_de; 267 bool is_same, is_bad; 268 /* 269 * de - memory of PATH_MAX bytes: 270 * [0-1024) - original name (dentry->d_name) 271 * [1024-2048) - paired to original name, usually DOS variant of dentry->d_name 272 * [2048-3072) - new name (new_dentry->d_name) 273 */ 274 static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + SIZEOF_RESIDENT < 1024); 275 static_assert(SIZEOF_ATTRIBUTE_FILENAME_MAX + sizeof(struct NTFS_DE) < 276 1024); 277 static_assert(PATH_MAX >= 4 * 1024); 278 279 if (flags & ~RENAME_NOREPLACE) 280 return -EINVAL; 281 282 is_same = dentry->d_name.len == new_dentry->d_name.len && 283 !memcmp(dentry->d_name.name, new_dentry->d_name.name, 284 dentry->d_name.len); 285 286 if (is_same && dir == new_dir) { 287 /* Nothing to do. */ 288 return 0; 289 } 290 291 if (ntfs_is_meta_file(sbi, inode->i_ino)) { 292 /* Should we print an error? */ 293 return -EINVAL; 294 } 295 296 if (new_inode) { 297 /* Target name exists. Unlink it. */ 298 dget(new_dentry); 299 ni_lock_dir(new_dir_ni); 300 err = ntfs_unlink_inode(new_dir, new_dentry); 301 ni_unlock(new_dir_ni); 302 dput(new_dentry); 303 if (err) 304 return err; 305 } 306 307 /* Allocate PATH_MAX bytes. */ 308 de = __getname(); 309 if (!de) 310 return -ENOMEM; 311 312 /* Translate dentry->d_name into unicode form. */ 313 err = fill_name_de(sbi, de, &dentry->d_name, NULL); 314 if (err < 0) 315 goto out; 316 317 if (is_same) { 318 /* Reuse 'de'. */ 319 new_de = de; 320 } else { 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); 324 if (err < 0) 325 goto out; 326 } 327 328 ni_lock_dir(dir_ni); 329 ni_lock(ni); 330 331 is_bad = false; 332 err = ni_rename(dir_ni, new_dir_ni, ni, de, new_de, &is_bad); 333 if (is_bad) { 334 /* Restore after failed rename failed too. */ 335 make_bad_inode(inode); 336 ntfs_inode_err(inode, "failed to undo rename"); 337 ntfs_set_state(sbi, NTFS_DIRTY_ERROR); 338 } else if (!err) { 339 inode->i_ctime = dir->i_ctime = dir->i_mtime = 340 current_time(dir); 341 mark_inode_dirty(inode); 342 mark_inode_dirty(dir); 343 if (dir != new_dir) { 344 new_dir->i_mtime = new_dir->i_ctime = dir->i_ctime; 345 mark_inode_dirty(new_dir); 346 } 347 348 if (IS_DIRSYNC(dir)) 349 ntfs_sync_inode(dir); 350 351 if (IS_DIRSYNC(new_dir)) 352 ntfs_sync_inode(inode); 353 } 354 355 ni_unlock(ni); 356 ni_unlock(dir_ni); 357 out: 358 __putname(de); 359 return err; 360 } 361 362 struct dentry *ntfs3_get_parent(struct dentry *child) 363 { 364 struct inode *inode = d_inode(child); 365 struct ntfs_inode *ni = ntfs_i(inode); 366 367 struct ATTR_LIST_ENTRY *le = NULL; 368 struct ATTRIB *attr = NULL; 369 struct ATTR_FILE_NAME *fname; 370 371 while ((attr = ni_find_attr(ni, attr, &le, ATTR_NAME, NULL, 0, NULL, 372 NULL))) { 373 fname = resident_data_ex(attr, SIZEOF_ATTRIBUTE_FILENAME); 374 if (!fname) 375 continue; 376 377 return d_obtain_alias( 378 ntfs_iget5(inode->i_sb, &fname->home, NULL)); 379 } 380 381 return ERR_PTR(-ENOENT); 382 } 383 384 // clang-format off 385 const struct inode_operations ntfs_dir_inode_operations = { 386 .lookup = ntfs_lookup, 387 .create = ntfs_create, 388 .link = ntfs_link, 389 .unlink = ntfs_unlink, 390 .symlink = ntfs_symlink, 391 .mkdir = ntfs_mkdir, 392 .rmdir = ntfs_rmdir, 393 .mknod = ntfs_mknod, 394 .rename = ntfs_rename, 395 .permission = ntfs_permission, 396 .get_acl = ntfs_get_acl, 397 .set_acl = ntfs_set_acl, 398 .setattr = ntfs3_setattr, 399 .getattr = ntfs_getattr, 400 .listxattr = ntfs_listxattr, 401 .fiemap = ntfs_fiemap, 402 }; 403 404 const struct inode_operations ntfs_special_inode_operations = { 405 .setattr = ntfs3_setattr, 406 .getattr = ntfs_getattr, 407 .listxattr = ntfs_listxattr, 408 .get_acl = ntfs_get_acl, 409 .set_acl = ntfs_set_acl, 410 }; 411 // clang-format on 412