1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * fs/f2fs/xattr.c 4 * 5 * Copyright (c) 2012 Samsung Electronics Co., Ltd. 6 * http://www.samsung.com/ 7 * 8 * Portions of this code from linux/fs/ext2/xattr.c 9 * 10 * Copyright (C) 2001-2003 Andreas Gruenbacher <agruen@suse.de> 11 * 12 * Fix by Harrison Xing <harrison@mountainviewdata.com>. 13 * Extended attributes for symlinks and special files added per 14 * suggestion of Luka Renko <luka.renko@hermes.si>. 15 * xattr consolidation Copyright (c) 2004 James Morris <jmorris@redhat.com>, 16 * Red Hat Inc. 17 */ 18 #include <linux/rwsem.h> 19 #include <linux/f2fs_fs.h> 20 #include <linux/security.h> 21 #include <linux/posix_acl_xattr.h> 22 #include "f2fs.h" 23 #include "xattr.h" 24 #include "segment.h" 25 26 static void *xattr_alloc(struct f2fs_sb_info *sbi, int size, bool *is_inline) 27 { 28 if (likely(size == sbi->inline_xattr_slab_size)) { 29 *is_inline = true; 30 return f2fs_kmem_cache_alloc(sbi->inline_xattr_slab, 31 GFP_F2FS_ZERO, false, sbi); 32 } 33 *is_inline = false; 34 return f2fs_kzalloc(sbi, size, GFP_NOFS); 35 } 36 37 static void xattr_free(struct f2fs_sb_info *sbi, void *xattr_addr, 38 bool is_inline) 39 { 40 if (is_inline) 41 kmem_cache_free(sbi->inline_xattr_slab, xattr_addr); 42 else 43 kfree(xattr_addr); 44 } 45 46 static int f2fs_xattr_generic_get(const struct xattr_handler *handler, 47 struct dentry *unused, struct inode *inode, 48 const char *name, void *buffer, size_t size) 49 { 50 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); 51 52 switch (handler->flags) { 53 case F2FS_XATTR_INDEX_USER: 54 if (!test_opt(sbi, XATTR_USER)) 55 return -EOPNOTSUPP; 56 break; 57 case F2FS_XATTR_INDEX_TRUSTED: 58 case F2FS_XATTR_INDEX_SECURITY: 59 break; 60 default: 61 return -EINVAL; 62 } 63 return f2fs_getxattr(inode, handler->flags, name, 64 buffer, size, NULL); 65 } 66 67 static int f2fs_xattr_generic_set(const struct xattr_handler *handler, 68 struct mnt_idmap *idmap, 69 struct dentry *unused, struct inode *inode, 70 const char *name, const void *value, 71 size_t size, int flags) 72 { 73 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb); 74 75 switch (handler->flags) { 76 case F2FS_XATTR_INDEX_USER: 77 if (!test_opt(sbi, XATTR_USER)) 78 return -EOPNOTSUPP; 79 break; 80 case F2FS_XATTR_INDEX_TRUSTED: 81 case F2FS_XATTR_INDEX_SECURITY: 82 break; 83 default: 84 return -EINVAL; 85 } 86 return f2fs_setxattr(inode, handler->flags, name, 87 value, size, NULL, flags); 88 } 89 90 static bool f2fs_xattr_user_list(struct dentry *dentry) 91 { 92 struct f2fs_sb_info *sbi = F2FS_SB(dentry->d_sb); 93 94 return test_opt(sbi, XATTR_USER); 95 } 96 97 static bool f2fs_xattr_trusted_list(struct dentry *dentry) 98 { 99 return capable(CAP_SYS_ADMIN); 100 } 101 102 static int f2fs_xattr_advise_get(const struct xattr_handler *handler, 103 struct dentry *unused, struct inode *inode, 104 const char *name, void *buffer, size_t size) 105 { 106 if (buffer) 107 *((char *)buffer) = F2FS_I(inode)->i_advise; 108 return sizeof(char); 109 } 110 111 static int f2fs_xattr_advise_set(const struct xattr_handler *handler, 112 struct mnt_idmap *idmap, 113 struct dentry *unused, struct inode *inode, 114 const char *name, const void *value, 115 size_t size, int flags) 116 { 117 unsigned char old_advise = F2FS_I(inode)->i_advise; 118 unsigned char new_advise; 119 120 if (!inode_owner_or_capable(&nop_mnt_idmap, inode)) 121 return -EPERM; 122 if (value == NULL) 123 return -EINVAL; 124 125 new_advise = *(char *)value; 126 if (new_advise & ~FADVISE_MODIFIABLE_BITS) 127 return -EINVAL; 128 129 new_advise = new_advise & FADVISE_MODIFIABLE_BITS; 130 new_advise |= old_advise & ~FADVISE_MODIFIABLE_BITS; 131 132 F2FS_I(inode)->i_advise = new_advise; 133 f2fs_mark_inode_dirty_sync(inode, true); 134 return 0; 135 } 136 137 #ifdef CONFIG_F2FS_FS_SECURITY 138 static int f2fs_initxattrs(struct inode *inode, const struct xattr *xattr_array, 139 void *page) 140 { 141 const struct xattr *xattr; 142 int err = 0; 143 144 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 145 err = f2fs_setxattr(inode, F2FS_XATTR_INDEX_SECURITY, 146 xattr->name, xattr->value, 147 xattr->value_len, (struct page *)page, 0); 148 if (err < 0) 149 break; 150 } 151 return err; 152 } 153 154 int f2fs_init_security(struct inode *inode, struct inode *dir, 155 const struct qstr *qstr, struct page *ipage) 156 { 157 return security_inode_init_security(inode, dir, qstr, 158 &f2fs_initxattrs, ipage); 159 } 160 #endif 161 162 const struct xattr_handler f2fs_xattr_user_handler = { 163 .prefix = XATTR_USER_PREFIX, 164 .flags = F2FS_XATTR_INDEX_USER, 165 .list = f2fs_xattr_user_list, 166 .get = f2fs_xattr_generic_get, 167 .set = f2fs_xattr_generic_set, 168 }; 169 170 const struct xattr_handler f2fs_xattr_trusted_handler = { 171 .prefix = XATTR_TRUSTED_PREFIX, 172 .flags = F2FS_XATTR_INDEX_TRUSTED, 173 .list = f2fs_xattr_trusted_list, 174 .get = f2fs_xattr_generic_get, 175 .set = f2fs_xattr_generic_set, 176 }; 177 178 const struct xattr_handler f2fs_xattr_advise_handler = { 179 .name = F2FS_SYSTEM_ADVISE_NAME, 180 .flags = F2FS_XATTR_INDEX_ADVISE, 181 .get = f2fs_xattr_advise_get, 182 .set = f2fs_xattr_advise_set, 183 }; 184 185 const struct xattr_handler f2fs_xattr_security_handler = { 186 .prefix = XATTR_SECURITY_PREFIX, 187 .flags = F2FS_XATTR_INDEX_SECURITY, 188 .get = f2fs_xattr_generic_get, 189 .set = f2fs_xattr_generic_set, 190 }; 191 192 static const struct xattr_handler *f2fs_xattr_handler_map[] = { 193 [F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler, 194 #ifdef CONFIG_F2FS_FS_POSIX_ACL 195 [F2FS_XATTR_INDEX_POSIX_ACL_ACCESS] = &posix_acl_access_xattr_handler, 196 [F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &posix_acl_default_xattr_handler, 197 #endif 198 [F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler, 199 #ifdef CONFIG_F2FS_FS_SECURITY 200 [F2FS_XATTR_INDEX_SECURITY] = &f2fs_xattr_security_handler, 201 #endif 202 [F2FS_XATTR_INDEX_ADVISE] = &f2fs_xattr_advise_handler, 203 }; 204 205 const struct xattr_handler *f2fs_xattr_handlers[] = { 206 &f2fs_xattr_user_handler, 207 #ifdef CONFIG_F2FS_FS_POSIX_ACL 208 &posix_acl_access_xattr_handler, 209 &posix_acl_default_xattr_handler, 210 #endif 211 &f2fs_xattr_trusted_handler, 212 #ifdef CONFIG_F2FS_FS_SECURITY 213 &f2fs_xattr_security_handler, 214 #endif 215 &f2fs_xattr_advise_handler, 216 NULL, 217 }; 218 219 static inline const struct xattr_handler *f2fs_xattr_handler(int index) 220 { 221 const struct xattr_handler *handler = NULL; 222 223 if (index > 0 && index < ARRAY_SIZE(f2fs_xattr_handler_map)) 224 handler = f2fs_xattr_handler_map[index]; 225 return handler; 226 } 227 228 static struct f2fs_xattr_entry *__find_xattr(void *base_addr, 229 void *last_base_addr, void **last_addr, 230 int index, size_t len, const char *name) 231 { 232 struct f2fs_xattr_entry *entry; 233 234 list_for_each_xattr(entry, base_addr) { 235 if ((void *)(entry) + sizeof(__u32) > last_base_addr || 236 (void *)XATTR_NEXT_ENTRY(entry) > last_base_addr) { 237 if (last_addr) 238 *last_addr = entry; 239 return NULL; 240 } 241 242 if (entry->e_name_index != index) 243 continue; 244 if (entry->e_name_len != len) 245 continue; 246 if (!memcmp(entry->e_name, name, len)) 247 break; 248 } 249 return entry; 250 } 251 252 static struct f2fs_xattr_entry *__find_inline_xattr(struct inode *inode, 253 void *base_addr, void **last_addr, int index, 254 size_t len, const char *name) 255 { 256 struct f2fs_xattr_entry *entry; 257 unsigned int inline_size = inline_xattr_size(inode); 258 void *max_addr = base_addr + inline_size; 259 260 entry = __find_xattr(base_addr, max_addr, last_addr, index, len, name); 261 if (!entry) 262 return NULL; 263 264 /* inline xattr header or entry across max inline xattr size */ 265 if (IS_XATTR_LAST_ENTRY(entry) && 266 (void *)entry + sizeof(__u32) > max_addr) { 267 *last_addr = entry; 268 return NULL; 269 } 270 return entry; 271 } 272 273 static int read_inline_xattr(struct inode *inode, struct page *ipage, 274 void *txattr_addr) 275 { 276 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 277 unsigned int inline_size = inline_xattr_size(inode); 278 struct page *page = NULL; 279 void *inline_addr; 280 281 if (ipage) { 282 inline_addr = inline_xattr_addr(inode, ipage); 283 } else { 284 page = f2fs_get_node_page(sbi, inode->i_ino); 285 if (IS_ERR(page)) 286 return PTR_ERR(page); 287 288 inline_addr = inline_xattr_addr(inode, page); 289 } 290 memcpy(txattr_addr, inline_addr, inline_size); 291 f2fs_put_page(page, 1); 292 293 return 0; 294 } 295 296 static int read_xattr_block(struct inode *inode, void *txattr_addr) 297 { 298 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 299 nid_t xnid = F2FS_I(inode)->i_xattr_nid; 300 unsigned int inline_size = inline_xattr_size(inode); 301 struct page *xpage; 302 void *xattr_addr; 303 304 /* The inode already has an extended attribute block. */ 305 xpage = f2fs_get_node_page(sbi, xnid); 306 if (IS_ERR(xpage)) 307 return PTR_ERR(xpage); 308 309 xattr_addr = page_address(xpage); 310 memcpy(txattr_addr + inline_size, xattr_addr, VALID_XATTR_BLOCK_SIZE); 311 f2fs_put_page(xpage, 1); 312 313 return 0; 314 } 315 316 static int lookup_all_xattrs(struct inode *inode, struct page *ipage, 317 unsigned int index, unsigned int len, 318 const char *name, struct f2fs_xattr_entry **xe, 319 void **base_addr, int *base_size, 320 bool *is_inline) 321 { 322 void *cur_addr, *txattr_addr, *last_txattr_addr; 323 void *last_addr = NULL; 324 nid_t xnid = F2FS_I(inode)->i_xattr_nid; 325 unsigned int inline_size = inline_xattr_size(inode); 326 int err; 327 328 if (!xnid && !inline_size) 329 return -ENODATA; 330 331 *base_size = XATTR_SIZE(inode) + XATTR_PADDING_SIZE; 332 txattr_addr = xattr_alloc(F2FS_I_SB(inode), *base_size, is_inline); 333 if (!txattr_addr) 334 return -ENOMEM; 335 336 last_txattr_addr = (void *)txattr_addr + XATTR_SIZE(inode); 337 338 /* read from inline xattr */ 339 if (inline_size) { 340 err = read_inline_xattr(inode, ipage, txattr_addr); 341 if (err) 342 goto out; 343 344 *xe = __find_inline_xattr(inode, txattr_addr, &last_addr, 345 index, len, name); 346 if (*xe) { 347 *base_size = inline_size; 348 goto check; 349 } 350 } 351 352 /* read from xattr node block */ 353 if (xnid) { 354 err = read_xattr_block(inode, txattr_addr); 355 if (err) 356 goto out; 357 } 358 359 if (last_addr) 360 cur_addr = XATTR_HDR(last_addr) - 1; 361 else 362 cur_addr = txattr_addr; 363 364 *xe = __find_xattr(cur_addr, last_txattr_addr, NULL, index, len, name); 365 if (!*xe) { 366 f2fs_err(F2FS_I_SB(inode), "inode (%lu) has corrupted xattr", 367 inode->i_ino); 368 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK); 369 err = -EFSCORRUPTED; 370 f2fs_handle_error(F2FS_I_SB(inode), 371 ERROR_CORRUPTED_XATTR); 372 goto out; 373 } 374 check: 375 if (IS_XATTR_LAST_ENTRY(*xe)) { 376 err = -ENODATA; 377 goto out; 378 } 379 380 *base_addr = txattr_addr; 381 return 0; 382 out: 383 xattr_free(F2FS_I_SB(inode), txattr_addr, *is_inline); 384 return err; 385 } 386 387 static int read_all_xattrs(struct inode *inode, struct page *ipage, 388 void **base_addr) 389 { 390 struct f2fs_xattr_header *header; 391 nid_t xnid = F2FS_I(inode)->i_xattr_nid; 392 unsigned int size = VALID_XATTR_BLOCK_SIZE; 393 unsigned int inline_size = inline_xattr_size(inode); 394 void *txattr_addr; 395 int err; 396 397 txattr_addr = f2fs_kzalloc(F2FS_I_SB(inode), 398 inline_size + size + XATTR_PADDING_SIZE, GFP_NOFS); 399 if (!txattr_addr) 400 return -ENOMEM; 401 402 /* read from inline xattr */ 403 if (inline_size) { 404 err = read_inline_xattr(inode, ipage, txattr_addr); 405 if (err) 406 goto fail; 407 } 408 409 /* read from xattr node block */ 410 if (xnid) { 411 err = read_xattr_block(inode, txattr_addr); 412 if (err) 413 goto fail; 414 } 415 416 header = XATTR_HDR(txattr_addr); 417 418 /* never been allocated xattrs */ 419 if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) { 420 header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC); 421 header->h_refcount = cpu_to_le32(1); 422 } 423 *base_addr = txattr_addr; 424 return 0; 425 fail: 426 kfree(txattr_addr); 427 return err; 428 } 429 430 static inline int write_all_xattrs(struct inode *inode, __u32 hsize, 431 void *txattr_addr, struct page *ipage) 432 { 433 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 434 size_t inline_size = inline_xattr_size(inode); 435 struct page *in_page = NULL; 436 void *xattr_addr; 437 void *inline_addr = NULL; 438 struct page *xpage; 439 nid_t new_nid = 0; 440 int err = 0; 441 442 if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid) 443 if (!f2fs_alloc_nid(sbi, &new_nid)) 444 return -ENOSPC; 445 446 /* write to inline xattr */ 447 if (inline_size) { 448 if (ipage) { 449 inline_addr = inline_xattr_addr(inode, ipage); 450 } else { 451 in_page = f2fs_get_node_page(sbi, inode->i_ino); 452 if (IS_ERR(in_page)) { 453 f2fs_alloc_nid_failed(sbi, new_nid); 454 return PTR_ERR(in_page); 455 } 456 inline_addr = inline_xattr_addr(inode, in_page); 457 } 458 459 f2fs_wait_on_page_writeback(ipage ? ipage : in_page, 460 NODE, true, true); 461 /* no need to use xattr node block */ 462 if (hsize <= inline_size) { 463 err = f2fs_truncate_xattr_node(inode); 464 f2fs_alloc_nid_failed(sbi, new_nid); 465 if (err) { 466 f2fs_put_page(in_page, 1); 467 return err; 468 } 469 memcpy(inline_addr, txattr_addr, inline_size); 470 set_page_dirty(ipage ? ipage : in_page); 471 goto in_page_out; 472 } 473 } 474 475 /* write to xattr node block */ 476 if (F2FS_I(inode)->i_xattr_nid) { 477 xpage = f2fs_get_node_page(sbi, F2FS_I(inode)->i_xattr_nid); 478 if (IS_ERR(xpage)) { 479 err = PTR_ERR(xpage); 480 f2fs_alloc_nid_failed(sbi, new_nid); 481 goto in_page_out; 482 } 483 f2fs_bug_on(sbi, new_nid); 484 f2fs_wait_on_page_writeback(xpage, NODE, true, true); 485 } else { 486 struct dnode_of_data dn; 487 488 set_new_dnode(&dn, inode, NULL, NULL, new_nid); 489 xpage = f2fs_new_node_page(&dn, XATTR_NODE_OFFSET); 490 if (IS_ERR(xpage)) { 491 err = PTR_ERR(xpage); 492 f2fs_alloc_nid_failed(sbi, new_nid); 493 goto in_page_out; 494 } 495 f2fs_alloc_nid_done(sbi, new_nid); 496 } 497 xattr_addr = page_address(xpage); 498 499 if (inline_size) 500 memcpy(inline_addr, txattr_addr, inline_size); 501 memcpy(xattr_addr, txattr_addr + inline_size, VALID_XATTR_BLOCK_SIZE); 502 503 if (inline_size) 504 set_page_dirty(ipage ? ipage : in_page); 505 set_page_dirty(xpage); 506 507 f2fs_put_page(xpage, 1); 508 in_page_out: 509 f2fs_put_page(in_page, 1); 510 return err; 511 } 512 513 int f2fs_getxattr(struct inode *inode, int index, const char *name, 514 void *buffer, size_t buffer_size, struct page *ipage) 515 { 516 struct f2fs_xattr_entry *entry = NULL; 517 int error; 518 unsigned int size, len; 519 void *base_addr = NULL; 520 int base_size; 521 bool is_inline; 522 523 if (name == NULL) 524 return -EINVAL; 525 526 len = strlen(name); 527 if (len > F2FS_NAME_LEN) 528 return -ERANGE; 529 530 f2fs_down_read(&F2FS_I(inode)->i_xattr_sem); 531 error = lookup_all_xattrs(inode, ipage, index, len, name, 532 &entry, &base_addr, &base_size, &is_inline); 533 f2fs_up_read(&F2FS_I(inode)->i_xattr_sem); 534 if (error) 535 return error; 536 537 size = le16_to_cpu(entry->e_value_size); 538 539 if (buffer && size > buffer_size) { 540 error = -ERANGE; 541 goto out; 542 } 543 544 if (buffer) { 545 char *pval = entry->e_name + entry->e_name_len; 546 547 if (base_size - (pval - (char *)base_addr) < size) { 548 error = -ERANGE; 549 goto out; 550 } 551 memcpy(buffer, pval, size); 552 } 553 error = size; 554 out: 555 xattr_free(F2FS_I_SB(inode), base_addr, is_inline); 556 return error; 557 } 558 559 ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) 560 { 561 struct inode *inode = d_inode(dentry); 562 struct f2fs_xattr_entry *entry; 563 void *base_addr, *last_base_addr; 564 int error; 565 size_t rest = buffer_size; 566 567 f2fs_down_read(&F2FS_I(inode)->i_xattr_sem); 568 error = read_all_xattrs(inode, NULL, &base_addr); 569 f2fs_up_read(&F2FS_I(inode)->i_xattr_sem); 570 if (error) 571 return error; 572 573 last_base_addr = (void *)base_addr + XATTR_SIZE(inode); 574 575 list_for_each_xattr(entry, base_addr) { 576 const struct xattr_handler *handler = 577 f2fs_xattr_handler(entry->e_name_index); 578 const char *prefix; 579 size_t prefix_len; 580 size_t size; 581 582 if ((void *)(entry) + sizeof(__u32) > last_base_addr || 583 (void *)XATTR_NEXT_ENTRY(entry) > last_base_addr) { 584 f2fs_err(F2FS_I_SB(inode), "inode (%lu) has corrupted xattr", 585 inode->i_ino); 586 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK); 587 error = -EFSCORRUPTED; 588 f2fs_handle_error(F2FS_I_SB(inode), 589 ERROR_CORRUPTED_XATTR); 590 goto cleanup; 591 } 592 593 if (!handler || (handler->list && !handler->list(dentry))) 594 continue; 595 596 prefix = xattr_prefix(handler); 597 prefix_len = strlen(prefix); 598 size = prefix_len + entry->e_name_len + 1; 599 if (buffer) { 600 if (size > rest) { 601 error = -ERANGE; 602 goto cleanup; 603 } 604 memcpy(buffer, prefix, prefix_len); 605 buffer += prefix_len; 606 memcpy(buffer, entry->e_name, entry->e_name_len); 607 buffer += entry->e_name_len; 608 *buffer++ = 0; 609 } 610 rest -= size; 611 } 612 error = buffer_size - rest; 613 cleanup: 614 kfree(base_addr); 615 return error; 616 } 617 618 static bool f2fs_xattr_value_same(struct f2fs_xattr_entry *entry, 619 const void *value, size_t size) 620 { 621 void *pval = entry->e_name + entry->e_name_len; 622 623 return (le16_to_cpu(entry->e_value_size) == size) && 624 !memcmp(pval, value, size); 625 } 626 627 static int __f2fs_setxattr(struct inode *inode, int index, 628 const char *name, const void *value, size_t size, 629 struct page *ipage, int flags) 630 { 631 struct f2fs_xattr_entry *here, *last; 632 void *base_addr, *last_base_addr; 633 int found, newsize; 634 size_t len; 635 __u32 new_hsize; 636 int error; 637 638 if (name == NULL) 639 return -EINVAL; 640 641 if (value == NULL) 642 size = 0; 643 644 len = strlen(name); 645 646 if (len > F2FS_NAME_LEN) 647 return -ERANGE; 648 649 if (size > MAX_VALUE_LEN(inode)) 650 return -E2BIG; 651 652 error = read_all_xattrs(inode, ipage, &base_addr); 653 if (error) 654 return error; 655 656 last_base_addr = (void *)base_addr + XATTR_SIZE(inode); 657 658 /* find entry with wanted name. */ 659 here = __find_xattr(base_addr, last_base_addr, NULL, index, len, name); 660 if (!here) { 661 f2fs_err(F2FS_I_SB(inode), "inode (%lu) has corrupted xattr", 662 inode->i_ino); 663 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK); 664 error = -EFSCORRUPTED; 665 f2fs_handle_error(F2FS_I_SB(inode), 666 ERROR_CORRUPTED_XATTR); 667 goto exit; 668 } 669 670 found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1; 671 672 if (found) { 673 if ((flags & XATTR_CREATE)) { 674 error = -EEXIST; 675 goto exit; 676 } 677 678 if (value && f2fs_xattr_value_same(here, value, size)) 679 goto same; 680 } else if ((flags & XATTR_REPLACE)) { 681 error = -ENODATA; 682 goto exit; 683 } 684 685 last = here; 686 while (!IS_XATTR_LAST_ENTRY(last)) { 687 if ((void *)(last) + sizeof(__u32) > last_base_addr || 688 (void *)XATTR_NEXT_ENTRY(last) > last_base_addr) { 689 f2fs_err(F2FS_I_SB(inode), "inode (%lu) has invalid last xattr entry, entry_size: %zu", 690 inode->i_ino, ENTRY_SIZE(last)); 691 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK); 692 error = -EFSCORRUPTED; 693 f2fs_handle_error(F2FS_I_SB(inode), 694 ERROR_CORRUPTED_XATTR); 695 goto exit; 696 } 697 last = XATTR_NEXT_ENTRY(last); 698 } 699 700 newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size); 701 702 /* 1. Check space */ 703 if (value) { 704 int free; 705 /* 706 * If value is NULL, it is remove operation. 707 * In case of update operation, we calculate free. 708 */ 709 free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr); 710 if (found) 711 free = free + ENTRY_SIZE(here); 712 713 if (unlikely(free < newsize)) { 714 error = -E2BIG; 715 goto exit; 716 } 717 } 718 719 /* 2. Remove old entry */ 720 if (found) { 721 /* 722 * If entry is found, remove old entry. 723 * If not found, remove operation is not needed. 724 */ 725 struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here); 726 int oldsize = ENTRY_SIZE(here); 727 728 memmove(here, next, (char *)last - (char *)next); 729 last = (struct f2fs_xattr_entry *)((char *)last - oldsize); 730 memset(last, 0, oldsize); 731 } 732 733 new_hsize = (char *)last - (char *)base_addr; 734 735 /* 3. Write new entry */ 736 if (value) { 737 char *pval; 738 /* 739 * Before we come here, old entry is removed. 740 * We just write new entry. 741 */ 742 last->e_name_index = index; 743 last->e_name_len = len; 744 memcpy(last->e_name, name, len); 745 pval = last->e_name + len; 746 memcpy(pval, value, size); 747 last->e_value_size = cpu_to_le16(size); 748 new_hsize += newsize; 749 } 750 751 error = write_all_xattrs(inode, new_hsize, base_addr, ipage); 752 if (error) 753 goto exit; 754 755 if (index == F2FS_XATTR_INDEX_ENCRYPTION && 756 !strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT)) 757 f2fs_set_encrypted_inode(inode); 758 f2fs_mark_inode_dirty_sync(inode, true); 759 if (!error && S_ISDIR(inode->i_mode)) 760 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_CP); 761 762 same: 763 if (is_inode_flag_set(inode, FI_ACL_MODE)) { 764 inode->i_mode = F2FS_I(inode)->i_acl_mode; 765 inode->i_ctime = current_time(inode); 766 clear_inode_flag(inode, FI_ACL_MODE); 767 } 768 769 exit: 770 kfree(base_addr); 771 return error; 772 } 773 774 int f2fs_setxattr(struct inode *inode, int index, const char *name, 775 const void *value, size_t size, 776 struct page *ipage, int flags) 777 { 778 struct f2fs_sb_info *sbi = F2FS_I_SB(inode); 779 int err; 780 781 if (unlikely(f2fs_cp_error(sbi))) 782 return -EIO; 783 if (!f2fs_is_checkpoint_ready(sbi)) 784 return -ENOSPC; 785 786 err = f2fs_dquot_initialize(inode); 787 if (err) 788 return err; 789 790 /* this case is only from f2fs_init_inode_metadata */ 791 if (ipage) 792 return __f2fs_setxattr(inode, index, name, value, 793 size, ipage, flags); 794 f2fs_balance_fs(sbi, true); 795 796 f2fs_lock_op(sbi); 797 f2fs_down_write(&F2FS_I(inode)->i_xattr_sem); 798 err = __f2fs_setxattr(inode, index, name, value, size, ipage, flags); 799 f2fs_up_write(&F2FS_I(inode)->i_xattr_sem); 800 f2fs_unlock_op(sbi); 801 802 f2fs_update_time(sbi, REQ_TIME); 803 return err; 804 } 805 806 int f2fs_init_xattr_caches(struct f2fs_sb_info *sbi) 807 { 808 dev_t dev = sbi->sb->s_bdev->bd_dev; 809 char slab_name[32]; 810 811 sprintf(slab_name, "f2fs_xattr_entry-%u:%u", MAJOR(dev), MINOR(dev)); 812 813 sbi->inline_xattr_slab_size = F2FS_OPTION(sbi).inline_xattr_size * 814 sizeof(__le32) + XATTR_PADDING_SIZE; 815 816 sbi->inline_xattr_slab = f2fs_kmem_cache_create(slab_name, 817 sbi->inline_xattr_slab_size); 818 if (!sbi->inline_xattr_slab) 819 return -ENOMEM; 820 821 return 0; 822 } 823 824 void f2fs_destroy_xattr_caches(struct f2fs_sb_info *sbi) 825 { 826 kmem_cache_destroy(sbi->inline_xattr_slab); 827 } 828