1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * This file is part of UBIFS. 4 * 5 * Copyright (C) 2006-2008 Nokia Corporation. 6 * 7 * Authors: Artem Bityutskiy (���������������� ����������) 8 * Adrian Hunter 9 */ 10 11/* 12 * This file implements UBIFS extended attributes support. 13 * 14 * Extended attributes are implemented as regular inodes with attached data, 15 * which limits extended attribute size to UBIFS block size (4KiB). Names of 16 * extended attributes are described by extended attribute entries (xentries), 17 * which are almost identical to directory entries, but have different key type. 18 * 19 * In other words, the situation with extended attributes is very similar to 20 * directories. Indeed, any inode (but of course not xattr inodes) may have a 21 * number of associated xentries, just like directory inodes have associated 22 * directory entries. Extended attribute entries store the name of the extended 23 * attribute, the host inode number, and the extended attribute inode number. 24 * Similarly, direntries store the name, the parent and the target inode 25 * numbers. Thus, most of the common UBIFS mechanisms may be re-used for 26 * extended attributes. 27 * 28 * The number of extended attributes is not limited, but there is Linux 29 * limitation on the maximum possible size of the list of all extended 30 * attributes associated with an inode (%XATTR_LIST_MAX), so UBIFS makes sure 31 * the sum of all extended attribute names of the inode does not exceed that 32 * limit. 33 * 34 * Extended attributes are synchronous, which means they are written to the 35 * flash media synchronously and there is no write-back for extended attribute 36 * inodes. The extended attribute values are not stored in compressed form on 37 * the media. 38 * 39 * Since extended attributes are represented by regular inodes, they are cached 40 * in the VFS inode cache. The xentries are cached in the LNC cache (see 41 * tnc.c). 42 * 43 * ACL support is not implemented. 44 */ 45 46#include "ubifs.h" 47#include <linux/fs.h> 48#include <linux/slab.h> 49#include <linux/xattr.h> 50 51/* 52 * Extended attribute type constants. 53 * 54 * USER_XATTR: user extended attribute ("user.*") 55 * TRUSTED_XATTR: trusted extended attribute ("trusted.*) 56 * SECURITY_XATTR: security extended attribute ("security.*") 57 */ 58enum { 59 USER_XATTR, 60 TRUSTED_XATTR, 61 SECURITY_XATTR, 62}; 63 64static const struct inode_operations empty_iops; 65static const struct file_operations empty_fops; 66 67/** 68 * create_xattr - create an extended attribute. 69 * @c: UBIFS file-system description object 70 * @host: host inode 71 * @nm: extended attribute name 72 * @value: extended attribute value 73 * @size: size of extended attribute value 74 * 75 * This is a helper function which creates an extended attribute of name @nm 76 * and value @value for inode @host. The host inode is also updated on flash 77 * because the ctime and extended attribute accounting data changes. This 78 * function returns zero in case of success and a negative error code in case 79 * of failure. 80 */ 81static int create_xattr(struct ubifs_info *c, struct inode *host, 82 const struct fscrypt_name *nm, const void *value, int size) 83{ 84 int err, names_len; 85 struct inode *inode; 86 struct ubifs_inode *ui, *host_ui = ubifs_inode(host); 87 struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1, 88 .new_ino_d = ALIGN(size, 8), .dirtied_ino = 1, 89 .dirtied_ino_d = ALIGN(host_ui->data_len, 8) }; 90 91 if (host_ui->xattr_cnt >= ubifs_xattr_max_cnt(c)) { 92 ubifs_err(c, "inode %lu already has too many xattrs (%d), cannot create more", 93 host->i_ino, host_ui->xattr_cnt); 94 return -ENOSPC; 95 } 96 /* 97 * Linux limits the maximum size of the extended attribute names list 98 * to %XATTR_LIST_MAX. This means we should not allow creating more 99 * extended attributes if the name list becomes larger. This limitation 100 * is artificial for UBIFS, though. 101 */ 102 names_len = host_ui->xattr_names + host_ui->xattr_cnt + fname_len(nm) + 1; 103 if (names_len > XATTR_LIST_MAX) { 104 ubifs_err(c, "cannot add one more xattr name to inode %lu, total names length would become %d, max. is %d", 105 host->i_ino, names_len, XATTR_LIST_MAX); 106 return -ENOSPC; 107 } 108 109 err = ubifs_budget_space(c, &req); 110 if (err) 111 return err; 112 113 inode = ubifs_new_inode(c, host, S_IFREG | S_IRWXUGO, true); 114 if (IS_ERR(inode)) { 115 err = PTR_ERR(inode); 116 goto out_budg; 117 } 118 119 /* Re-define all operations to be "nothing" */ 120 inode->i_mapping->a_ops = &empty_aops; 121 inode->i_op = &empty_iops; 122 inode->i_fop = &empty_fops; 123 124 inode->i_flags |= S_SYNC | S_NOATIME | S_NOCMTIME; 125 ui = ubifs_inode(inode); 126 ui->xattr = 1; 127 ui->flags |= UBIFS_XATTR_FL; 128 ui->data = kmemdup(value, size, GFP_NOFS); 129 if (!ui->data) { 130 err = -ENOMEM; 131 goto out_free; 132 } 133 inode->i_size = ui->ui_size = size; 134 ui->data_len = size; 135 136 mutex_lock(&host_ui->ui_mutex); 137 inode_set_ctime_current(host); 138 host_ui->xattr_cnt += 1; 139 host_ui->xattr_size += CALC_DENT_SIZE(fname_len(nm)); 140 host_ui->xattr_size += CALC_XATTR_BYTES(size); 141 host_ui->xattr_names += fname_len(nm); 142 143 /* 144 * We handle UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT here because we 145 * have to set the UBIFS_CRYPT_FL flag on the host inode. 146 * To avoid multiple updates of the same inode in the same operation, 147 * let's do it here. 148 */ 149 if (strcmp(fname_name(nm), UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT) == 0) 150 host_ui->flags |= UBIFS_CRYPT_FL; 151 152 err = ubifs_jnl_update(c, host, nm, inode, 0, 1); 153 if (err) 154 goto out_cancel; 155 ubifs_set_inode_flags(host); 156 mutex_unlock(&host_ui->ui_mutex); 157 158 ubifs_release_budget(c, &req); 159 insert_inode_hash(inode); 160 iput(inode); 161 return 0; 162 163out_cancel: 164 host_ui->xattr_cnt -= 1; 165 host_ui->xattr_size -= CALC_DENT_SIZE(fname_len(nm)); 166 host_ui->xattr_size -= CALC_XATTR_BYTES(size); 167 host_ui->xattr_names -= fname_len(nm); 168 host_ui->flags &= ~UBIFS_CRYPT_FL; 169 mutex_unlock(&host_ui->ui_mutex); 170out_free: 171 make_bad_inode(inode); 172 iput(inode); 173out_budg: 174 ubifs_release_budget(c, &req); 175 return err; 176} 177 178/** 179 * change_xattr - change an extended attribute. 180 * @c: UBIFS file-system description object 181 * @host: host inode 182 * @inode: extended attribute inode 183 * @value: extended attribute value 184 * @size: size of extended attribute value 185 * 186 * This helper function changes the value of extended attribute @inode with new 187 * data from @value. Returns zero in case of success and a negative error code 188 * in case of failure. 189 */ 190static int change_xattr(struct ubifs_info *c, struct inode *host, 191 struct inode *inode, const void *value, int size) 192{ 193 int err; 194 struct ubifs_inode *host_ui = ubifs_inode(host); 195 struct ubifs_inode *ui = ubifs_inode(inode); 196 void *buf = NULL; 197 int old_size; 198 struct ubifs_budget_req req = { .dirtied_ino = 2, 199 .dirtied_ino_d = ALIGN(size, 8) + ALIGN(host_ui->data_len, 8) }; 200 201 ubifs_assert(c, ui->data_len == inode->i_size); 202 err = ubifs_budget_space(c, &req); 203 if (err) 204 return err; 205 206 buf = kmemdup(value, size, GFP_NOFS); 207 if (!buf) { 208 err = -ENOMEM; 209 goto out_free; 210 } 211 kfree(ui->data); 212 ui->data = buf; 213 inode->i_size = ui->ui_size = size; 214 old_size = ui->data_len; 215 ui->data_len = size; 216 217 mutex_lock(&host_ui->ui_mutex); 218 inode_set_ctime_current(host); 219 host_ui->xattr_size -= CALC_XATTR_BYTES(old_size); 220 host_ui->xattr_size += CALC_XATTR_BYTES(size); 221 222 /* 223 * It is important to write the host inode after the xattr inode 224 * because if the host inode gets synchronized (via 'fsync()'), then 225 * the extended attribute inode gets synchronized, because it goes 226 * before the host inode in the write-buffer. 227 */ 228 err = ubifs_jnl_change_xattr(c, inode, host); 229 if (err) 230 goto out_cancel; 231 mutex_unlock(&host_ui->ui_mutex); 232 233 ubifs_release_budget(c, &req); 234 return 0; 235 236out_cancel: 237 host_ui->xattr_size -= CALC_XATTR_BYTES(size); 238 host_ui->xattr_size += CALC_XATTR_BYTES(old_size); 239 mutex_unlock(&host_ui->ui_mutex); 240 make_bad_inode(inode); 241out_free: 242 ubifs_release_budget(c, &req); 243 return err; 244} 245 246static struct inode *iget_xattr(struct ubifs_info *c, ino_t inum) 247{ 248 struct inode *inode; 249 250 inode = ubifs_iget(c->vfs_sb, inum); 251 if (IS_ERR(inode)) { 252 ubifs_err(c, "dead extended attribute entry, error %d", 253 (int)PTR_ERR(inode)); 254 return inode; 255 } 256 if (ubifs_inode(inode)->xattr) 257 return inode; 258 ubifs_err(c, "corrupt extended attribute entry"); 259 iput(inode); 260 return ERR_PTR(-EINVAL); 261} 262 263int ubifs_xattr_set(struct inode *host, const char *name, const void *value, 264 size_t size, int flags, bool check_lock) 265{ 266 struct inode *inode; 267 struct ubifs_info *c = host->i_sb->s_fs_info; 268 struct fscrypt_name nm = { .disk_name = FSTR_INIT((char *)name, strlen(name))}; 269 struct ubifs_dent_node *xent; 270 union ubifs_key key; 271 int err; 272 273 if (check_lock) 274 ubifs_assert(c, inode_is_locked(host)); 275 276 if (size > UBIFS_MAX_INO_DATA) 277 return -ERANGE; 278 279 if (fname_len(&nm) > UBIFS_MAX_NLEN) 280 return -ENAMETOOLONG; 281 282 xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS); 283 if (!xent) 284 return -ENOMEM; 285 286 down_write(&ubifs_inode(host)->xattr_sem); 287 /* 288 * The extended attribute entries are stored in LNC, so multiple 289 * look-ups do not involve reading the flash. 290 */ 291 xent_key_init(c, &key, host->i_ino, &nm); 292 err = ubifs_tnc_lookup_nm(c, &key, xent, &nm); 293 if (err) { 294 if (err != -ENOENT) 295 goto out_free; 296 297 if (flags & XATTR_REPLACE) 298 /* We are asked not to create the xattr */ 299 err = -ENODATA; 300 else 301 err = create_xattr(c, host, &nm, value, size); 302 goto out_free; 303 } 304 305 if (flags & XATTR_CREATE) { 306 /* We are asked not to replace the xattr */ 307 err = -EEXIST; 308 goto out_free; 309 } 310 311 inode = iget_xattr(c, le64_to_cpu(xent->inum)); 312 if (IS_ERR(inode)) { 313 err = PTR_ERR(inode); 314 goto out_free; 315 } 316 317 err = change_xattr(c, host, inode, value, size); 318 iput(inode); 319 320out_free: 321 up_write(&ubifs_inode(host)->xattr_sem); 322 kfree(xent); 323 return err; 324} 325 326ssize_t ubifs_xattr_get(struct inode *host, const char *name, void *buf, 327 size_t size) 328{ 329 struct inode *inode; 330 struct ubifs_info *c = host->i_sb->s_fs_info; 331 struct fscrypt_name nm = { .disk_name = FSTR_INIT((char *)name, strlen(name))}; 332 struct ubifs_inode *ui; 333 struct ubifs_dent_node *xent; 334 union ubifs_key key; 335 int err; 336 337 if (fname_len(&nm) > UBIFS_MAX_NLEN) 338 return -ENAMETOOLONG; 339 340 xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS); 341 if (!xent) 342 return -ENOMEM; 343 344 down_read(&ubifs_inode(host)->xattr_sem); 345 xent_key_init(c, &key, host->i_ino, &nm); 346 err = ubifs_tnc_lookup_nm(c, &key, xent, &nm); 347 if (err) { 348 if (err == -ENOENT) 349 err = -ENODATA; 350 goto out_cleanup; 351 } 352 353 inode = iget_xattr(c, le64_to_cpu(xent->inum)); 354 if (IS_ERR(inode)) { 355 err = PTR_ERR(inode); 356 goto out_cleanup; 357 } 358 359 ui = ubifs_inode(inode); 360 ubifs_assert(c, inode->i_size == ui->data_len); 361 ubifs_assert(c, ubifs_inode(host)->xattr_size > ui->data_len); 362 363 if (buf) { 364 /* If @buf is %NULL we are supposed to return the length */ 365 if (ui->data_len > size) { 366 err = -ERANGE; 367 goto out_iput; 368 } 369 370 memcpy(buf, ui->data, ui->data_len); 371 } 372 err = ui->data_len; 373 374out_iput: 375 iput(inode); 376out_cleanup: 377 up_read(&ubifs_inode(host)->xattr_sem); 378 kfree(xent); 379 return err; 380} 381 382static bool xattr_visible(const char *name) 383{ 384 /* File encryption related xattrs are for internal use only */ 385 if (strcmp(name, UBIFS_XATTR_NAME_ENCRYPTION_CONTEXT) == 0) 386 return false; 387 388 /* Show trusted namespace only for "power" users */ 389 if (strncmp(name, XATTR_TRUSTED_PREFIX, 390 XATTR_TRUSTED_PREFIX_LEN) == 0 && !capable(CAP_SYS_ADMIN)) 391 return false; 392 393 return true; 394} 395 396ssize_t ubifs_listxattr(struct dentry *dentry, char *buffer, size_t size) 397{ 398 union ubifs_key key; 399 struct inode *host = d_inode(dentry); 400 struct ubifs_info *c = host->i_sb->s_fs_info; 401 struct ubifs_inode *host_ui = ubifs_inode(host); 402 struct ubifs_dent_node *xent, *pxent = NULL; 403 int err, len, written = 0; 404 struct fscrypt_name nm = {0}; 405 406 dbg_gen("ino %lu ('%pd'), buffer size %zd", host->i_ino, 407 dentry, size); 408 409 down_read(&host_ui->xattr_sem); 410 len = host_ui->xattr_names + host_ui->xattr_cnt; 411 if (!buffer) { 412 /* 413 * We should return the minimum buffer size which will fit a 414 * null-terminated list of all the extended attribute names. 415 */ 416 err = len; 417 goto out_err; 418 } 419 420 if (len > size) { 421 err = -ERANGE; 422 goto out_err; 423 } 424 425 lowest_xent_key(c, &key, host->i_ino); 426 while (1) { 427 xent = ubifs_tnc_next_ent(c, &key, &nm); 428 if (IS_ERR(xent)) { 429 err = PTR_ERR(xent); 430 break; 431 } 432 433 fname_name(&nm) = xent->name; 434 fname_len(&nm) = le16_to_cpu(xent->nlen); 435 436 if (xattr_visible(xent->name)) { 437 memcpy(buffer + written, fname_name(&nm), fname_len(&nm) + 1); 438 written += fname_len(&nm) + 1; 439 } 440 441 kfree(pxent); 442 pxent = xent; 443 key_read(c, &xent->key, &key); 444 } 445 kfree(pxent); 446 up_read(&host_ui->xattr_sem); 447 448 if (err != -ENOENT) { 449 ubifs_err(c, "cannot find next direntry, error %d", err); 450 return err; 451 } 452 453 ubifs_assert(c, written <= size); 454 return written; 455 456out_err: 457 up_read(&host_ui->xattr_sem); 458 return err; 459} 460 461static int remove_xattr(struct ubifs_info *c, struct inode *host, 462 struct inode *inode, const struct fscrypt_name *nm) 463{ 464 int err; 465 struct ubifs_inode *host_ui = ubifs_inode(host); 466 struct ubifs_inode *ui = ubifs_inode(inode); 467 struct ubifs_budget_req req = { .dirtied_ino = 2, .mod_dent = 1, 468 .dirtied_ino_d = ALIGN(host_ui->data_len, 8) }; 469 470 ubifs_assert(c, ui->data_len == inode->i_size); 471 472 err = ubifs_budget_space(c, &req); 473 if (err) 474 return err; 475 476 mutex_lock(&host_ui->ui_mutex); 477 inode_set_ctime_current(host); 478 host_ui->xattr_cnt -= 1; 479 host_ui->xattr_size -= CALC_DENT_SIZE(fname_len(nm)); 480 host_ui->xattr_size -= CALC_XATTR_BYTES(ui->data_len); 481 host_ui->xattr_names -= fname_len(nm); 482 483 err = ubifs_jnl_delete_xattr(c, host, inode, nm); 484 if (err) 485 goto out_cancel; 486 mutex_unlock(&host_ui->ui_mutex); 487 488 ubifs_release_budget(c, &req); 489 return 0; 490 491out_cancel: 492 host_ui->xattr_cnt += 1; 493 host_ui->xattr_size += CALC_DENT_SIZE(fname_len(nm)); 494 host_ui->xattr_size += CALC_XATTR_BYTES(ui->data_len); 495 host_ui->xattr_names += fname_len(nm); 496 mutex_unlock(&host_ui->ui_mutex); 497 ubifs_release_budget(c, &req); 498 make_bad_inode(inode); 499 return err; 500} 501 502int ubifs_purge_xattrs(struct inode *host) 503{ 504 union ubifs_key key; 505 struct ubifs_info *c = host->i_sb->s_fs_info; 506 struct ubifs_dent_node *xent, *pxent = NULL; 507 struct inode *xino; 508 struct fscrypt_name nm = {0}; 509 int err; 510 511 if (ubifs_inode(host)->xattr_cnt <= ubifs_xattr_max_cnt(c)) 512 return 0; 513 514 ubifs_warn(c, "inode %lu has too many xattrs, doing a non-atomic deletion", 515 host->i_ino); 516 517 down_write(&ubifs_inode(host)->xattr_sem); 518 lowest_xent_key(c, &key, host->i_ino); 519 while (1) { 520 xent = ubifs_tnc_next_ent(c, &key, &nm); 521 if (IS_ERR(xent)) { 522 err = PTR_ERR(xent); 523 break; 524 } 525 526 fname_name(&nm) = xent->name; 527 fname_len(&nm) = le16_to_cpu(xent->nlen); 528 529 xino = ubifs_iget(c->vfs_sb, le64_to_cpu(xent->inum)); 530 if (IS_ERR(xino)) { 531 err = PTR_ERR(xino); 532 ubifs_err(c, "dead directory entry '%s', error %d", 533 xent->name, err); 534 ubifs_ro_mode(c, err); 535 kfree(pxent); 536 kfree(xent); 537 goto out_err; 538 } 539 540 ubifs_assert(c, ubifs_inode(xino)->xattr); 541 542 clear_nlink(xino); 543 err = remove_xattr(c, host, xino, &nm); 544 if (err) { 545 kfree(pxent); 546 kfree(xent); 547 iput(xino); 548 ubifs_err(c, "cannot remove xattr, error %d", err); 549 goto out_err; 550 } 551 552 iput(xino); 553 554 kfree(pxent); 555 pxent = xent; 556 key_read(c, &xent->key, &key); 557 } 558 kfree(pxent); 559 up_write(&ubifs_inode(host)->xattr_sem); 560 561 if (err != -ENOENT) { 562 ubifs_err(c, "cannot find next direntry, error %d", err); 563 return err; 564 } 565 566 return 0; 567 568out_err: 569 up_write(&ubifs_inode(host)->xattr_sem); 570 return err; 571} 572 573/** 574 * ubifs_evict_xattr_inode - Evict an xattr inode. 575 * @c: UBIFS file-system description object 576 * @xattr_inum: xattr inode number 577 * 578 * When an inode that hosts xattrs is being removed we have to make sure 579 * that cached inodes of the xattrs also get removed from the inode cache 580 * otherwise we'd waste memory. This function looks up an inode from the 581 * inode cache and clears the link counter such that iput() will evict 582 * the inode. 583 */ 584void ubifs_evict_xattr_inode(struct ubifs_info *c, ino_t xattr_inum) 585{ 586 struct inode *inode; 587 588 inode = ilookup(c->vfs_sb, xattr_inum); 589 if (inode) { 590 clear_nlink(inode); 591 iput(inode); 592 } 593} 594 595static int ubifs_xattr_remove(struct inode *host, const char *name) 596{ 597 struct inode *inode; 598 struct ubifs_info *c = host->i_sb->s_fs_info; 599 struct fscrypt_name nm = { .disk_name = FSTR_INIT((char *)name, strlen(name))}; 600 struct ubifs_dent_node *xent; 601 union ubifs_key key; 602 int err; 603 604 ubifs_assert(c, inode_is_locked(host)); 605 606 if (fname_len(&nm) > UBIFS_MAX_NLEN) 607 return -ENAMETOOLONG; 608 609 xent = kmalloc(UBIFS_MAX_XENT_NODE_SZ, GFP_NOFS); 610 if (!xent) 611 return -ENOMEM; 612 613 down_write(&ubifs_inode(host)->xattr_sem); 614 xent_key_init(c, &key, host->i_ino, &nm); 615 err = ubifs_tnc_lookup_nm(c, &key, xent, &nm); 616 if (err) { 617 if (err == -ENOENT) 618 err = -ENODATA; 619 goto out_free; 620 } 621 622 inode = iget_xattr(c, le64_to_cpu(xent->inum)); 623 if (IS_ERR(inode)) { 624 err = PTR_ERR(inode); 625 goto out_free; 626 } 627 628 ubifs_assert(c, inode->i_nlink == 1); 629 clear_nlink(inode); 630 err = remove_xattr(c, host, inode, &nm); 631 if (err) 632 set_nlink(inode, 1); 633 634 /* If @i_nlink is 0, 'iput()' will delete the inode */ 635 iput(inode); 636 637out_free: 638 up_write(&ubifs_inode(host)->xattr_sem); 639 kfree(xent); 640 return err; 641} 642 643#ifdef CONFIG_UBIFS_FS_SECURITY 644static int init_xattrs(struct inode *inode, const struct xattr *xattr_array, 645 void *fs_info) 646{ 647 const struct xattr *xattr; 648 char *name; 649 int err = 0; 650 651 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 652 name = kmalloc(XATTR_SECURITY_PREFIX_LEN + 653 strlen(xattr->name) + 1, GFP_NOFS); 654 if (!name) { 655 err = -ENOMEM; 656 break; 657 } 658 strcpy(name, XATTR_SECURITY_PREFIX); 659 strcpy(name + XATTR_SECURITY_PREFIX_LEN, xattr->name); 660 /* 661 * creating a new inode without holding the inode rwsem, 662 * no need to check whether inode is locked. 663 */ 664 err = ubifs_xattr_set(inode, name, xattr->value, 665 xattr->value_len, 0, false); 666 kfree(name); 667 if (err < 0) 668 break; 669 } 670 671 return err; 672} 673 674int ubifs_init_security(struct inode *dentry, struct inode *inode, 675 const struct qstr *qstr) 676{ 677 int err; 678 679 err = security_inode_init_security(inode, dentry, qstr, 680 &init_xattrs, NULL); 681 if (err) { 682 struct ubifs_info *c = dentry->i_sb->s_fs_info; 683 ubifs_err(c, "cannot initialize security for inode %lu, error %d", 684 inode->i_ino, err); 685 } 686 return err; 687} 688#endif 689 690static int xattr_get(const struct xattr_handler *handler, 691 struct dentry *dentry, struct inode *inode, 692 const char *name, void *buffer, size_t size) 693{ 694 dbg_gen("xattr '%s', ino %lu ('%pd'), buf size %zd", name, 695 inode->i_ino, dentry, size); 696 697 name = xattr_full_name(handler, name); 698 return ubifs_xattr_get(inode, name, buffer, size); 699} 700 701static int xattr_set(const struct xattr_handler *handler, 702 struct mnt_idmap *idmap, 703 struct dentry *dentry, struct inode *inode, 704 const char *name, const void *value, 705 size_t size, int flags) 706{ 707 dbg_gen("xattr '%s', host ino %lu ('%pd'), size %zd", 708 name, inode->i_ino, dentry, size); 709 710 name = xattr_full_name(handler, name); 711 712 if (value) 713 return ubifs_xattr_set(inode, name, value, size, flags, true); 714 else 715 return ubifs_xattr_remove(inode, name); 716} 717 718static const struct xattr_handler ubifs_user_xattr_handler = { 719 .prefix = XATTR_USER_PREFIX, 720 .get = xattr_get, 721 .set = xattr_set, 722}; 723 724static const struct xattr_handler ubifs_trusted_xattr_handler = { 725 .prefix = XATTR_TRUSTED_PREFIX, 726 .get = xattr_get, 727 .set = xattr_set, 728}; 729 730#ifdef CONFIG_UBIFS_FS_SECURITY 731static const struct xattr_handler ubifs_security_xattr_handler = { 732 .prefix = XATTR_SECURITY_PREFIX, 733 .get = xattr_get, 734 .set = xattr_set, 735}; 736#endif 737 738const struct xattr_handler * const ubifs_xattr_handlers[] = { 739 &ubifs_user_xattr_handler, 740 &ubifs_trusted_xattr_handler, 741#ifdef CONFIG_UBIFS_FS_SECURITY 742 &ubifs_security_xattr_handler, 743#endif 744 NULL 745}; 746