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