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