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1// SPDX-License-Identifier: GPL-2.02/*3 * fs/f2fs/xattr.c4 *5 * Copyright (c) 2012 Samsung Electronics Co., Ltd.6 * http://www.samsung.com/7 *8 * Portions of this code from linux/fs/ext2/xattr.c9 *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 per14 * 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 26static 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 37static 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 else43 kfree(xattr_addr);44}45 46static 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 67static 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 90static 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 97static bool f2fs_xattr_trusted_list(struct dentry *dentry)98{99 return capable(CAP_SYS_ADMIN);100}101 102static 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 111static 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_SECURITY138static 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 154int 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#endif161 162const 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 170const 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 178const 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 185const 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 192static const struct xattr_handler * const f2fs_xattr_handler_map[] = {193 [F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler,194#ifdef CONFIG_F2FS_FS_POSIX_ACL195 [F2FS_XATTR_INDEX_POSIX_ACL_ACCESS] = &nop_posix_acl_access,196 [F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &nop_posix_acl_default,197#endif198 [F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler,199#ifdef CONFIG_F2FS_FS_SECURITY200 [F2FS_XATTR_INDEX_SECURITY] = &f2fs_xattr_security_handler,201#endif202 [F2FS_XATTR_INDEX_ADVISE] = &f2fs_xattr_advise_handler,203};204 205const struct xattr_handler * const f2fs_xattr_handlers[] = {206 &f2fs_xattr_user_handler,207 &f2fs_xattr_trusted_handler,208#ifdef CONFIG_F2FS_FS_SECURITY209 &f2fs_xattr_security_handler,210#endif211 &f2fs_xattr_advise_handler,212 NULL,213};214 215static inline const char *f2fs_xattr_prefix(int index,216 struct dentry *dentry)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];222 223 if (!xattr_handler_can_list(handler, dentry))224 return NULL;225 226 return xattr_prefix(handler);227}228 229static struct f2fs_xattr_entry *__find_xattr(void *base_addr,230 void *last_base_addr, void **last_addr,231 int index, size_t len, const char *name)232{233 struct f2fs_xattr_entry *entry;234 235 list_for_each_xattr(entry, base_addr) {236 if ((void *)(entry) + sizeof(__u32) > last_base_addr ||237 (void *)XATTR_NEXT_ENTRY(entry) > last_base_addr) {238 if (last_addr)239 *last_addr = entry;240 return NULL;241 }242 243 if (entry->e_name_index != index)244 continue;245 if (entry->e_name_len != len)246 continue;247 if (!memcmp(entry->e_name, name, len))248 break;249 }250 return entry;251}252 253static struct f2fs_xattr_entry *__find_inline_xattr(struct inode *inode,254 void *base_addr, void **last_addr, int index,255 size_t len, const char *name)256{257 struct f2fs_xattr_entry *entry;258 unsigned int inline_size = inline_xattr_size(inode);259 void *max_addr = base_addr + inline_size;260 261 entry = __find_xattr(base_addr, max_addr, last_addr, index, len, name);262 if (!entry)263 return NULL;264 265 /* inline xattr header or entry across max inline xattr size */266 if (IS_XATTR_LAST_ENTRY(entry) &&267 (void *)entry + sizeof(__u32) > max_addr) {268 *last_addr = entry;269 return NULL;270 }271 return entry;272}273 274static int read_inline_xattr(struct inode *inode, struct page *ipage,275 void *txattr_addr)276{277 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);278 unsigned int inline_size = inline_xattr_size(inode);279 struct page *page = NULL;280 void *inline_addr;281 282 if (ipage) {283 inline_addr = inline_xattr_addr(inode, ipage);284 } else {285 page = f2fs_get_node_page(sbi, inode->i_ino);286 if (IS_ERR(page))287 return PTR_ERR(page);288 289 inline_addr = inline_xattr_addr(inode, page);290 }291 memcpy(txattr_addr, inline_addr, inline_size);292 f2fs_put_page(page, 1);293 294 return 0;295}296 297static int read_xattr_block(struct inode *inode, void *txattr_addr)298{299 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);300 nid_t xnid = F2FS_I(inode)->i_xattr_nid;301 unsigned int inline_size = inline_xattr_size(inode);302 struct page *xpage;303 void *xattr_addr;304 305 /* The inode already has an extended attribute block. */306 xpage = f2fs_get_node_page(sbi, xnid);307 if (IS_ERR(xpage))308 return PTR_ERR(xpage);309 310 xattr_addr = page_address(xpage);311 memcpy(txattr_addr + inline_size, xattr_addr, VALID_XATTR_BLOCK_SIZE);312 f2fs_put_page(xpage, 1);313 314 return 0;315}316 317static int lookup_all_xattrs(struct inode *inode, struct page *ipage,318 unsigned int index, unsigned int len,319 const char *name, struct f2fs_xattr_entry **xe,320 void **base_addr, int *base_size,321 bool *is_inline)322{323 void *cur_addr, *txattr_addr, *last_txattr_addr;324 void *last_addr = NULL;325 nid_t xnid = F2FS_I(inode)->i_xattr_nid;326 unsigned int inline_size = inline_xattr_size(inode);327 int err;328 329 if (!xnid && !inline_size)330 return -ENODATA;331 332 *base_size = XATTR_SIZE(inode) + XATTR_PADDING_SIZE;333 txattr_addr = xattr_alloc(F2FS_I_SB(inode), *base_size, is_inline);334 if (!txattr_addr)335 return -ENOMEM;336 337 last_txattr_addr = (void *)txattr_addr + XATTR_SIZE(inode);338 339 /* read from inline xattr */340 if (inline_size) {341 err = read_inline_xattr(inode, ipage, txattr_addr);342 if (err)343 goto out;344 345 *xe = __find_inline_xattr(inode, txattr_addr, &last_addr,346 index, len, name);347 if (*xe) {348 *base_size = inline_size;349 goto check;350 }351 }352 353 /* read from xattr node block */354 if (xnid) {355 err = read_xattr_block(inode, txattr_addr);356 if (err)357 goto out;358 }359 360 if (last_addr)361 cur_addr = XATTR_HDR(last_addr) - 1;362 else363 cur_addr = txattr_addr;364 365 *xe = __find_xattr(cur_addr, last_txattr_addr, NULL, index, len, name);366 if (!*xe) {367 f2fs_err(F2FS_I_SB(inode), "lookup inode (%lu) has corrupted xattr",368 inode->i_ino);369 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);370 err = -ENODATA;371 f2fs_handle_error(F2FS_I_SB(inode),372 ERROR_CORRUPTED_XATTR);373 goto out;374 }375check:376 if (IS_XATTR_LAST_ENTRY(*xe)) {377 err = -ENODATA;378 goto out;379 }380 381 *base_addr = txattr_addr;382 return 0;383out:384 xattr_free(F2FS_I_SB(inode), txattr_addr, *is_inline);385 return err;386}387 388static int read_all_xattrs(struct inode *inode, struct page *ipage,389 void **base_addr)390{391 struct f2fs_xattr_header *header;392 nid_t xnid = F2FS_I(inode)->i_xattr_nid;393 unsigned int size = VALID_XATTR_BLOCK_SIZE;394 unsigned int inline_size = inline_xattr_size(inode);395 void *txattr_addr;396 int err;397 398 txattr_addr = f2fs_kzalloc(F2FS_I_SB(inode),399 inline_size + size + XATTR_PADDING_SIZE, GFP_NOFS);400 if (!txattr_addr)401 return -ENOMEM;402 403 /* read from inline xattr */404 if (inline_size) {405 err = read_inline_xattr(inode, ipage, txattr_addr);406 if (err)407 goto fail;408 }409 410 /* read from xattr node block */411 if (xnid) {412 err = read_xattr_block(inode, txattr_addr);413 if (err)414 goto fail;415 }416 417 header = XATTR_HDR(txattr_addr);418 419 /* never been allocated xattrs */420 if (le32_to_cpu(header->h_magic) != F2FS_XATTR_MAGIC) {421 header->h_magic = cpu_to_le32(F2FS_XATTR_MAGIC);422 header->h_refcount = cpu_to_le32(1);423 }424 *base_addr = txattr_addr;425 return 0;426fail:427 kfree(txattr_addr);428 return err;429}430 431static inline int write_all_xattrs(struct inode *inode, __u32 hsize,432 void *txattr_addr, struct page *ipage)433{434 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);435 size_t inline_size = inline_xattr_size(inode);436 struct page *in_page = NULL;437 void *xattr_addr;438 void *inline_addr = NULL;439 struct page *xpage;440 nid_t new_nid = 0;441 int err = 0;442 443 if (hsize > inline_size && !F2FS_I(inode)->i_xattr_nid)444 if (!f2fs_alloc_nid(sbi, &new_nid))445 return -ENOSPC;446 447 /* write to inline xattr */448 if (inline_size) {449 if (ipage) {450 inline_addr = inline_xattr_addr(inode, ipage);451 } else {452 in_page = f2fs_get_node_page(sbi, inode->i_ino);453 if (IS_ERR(in_page)) {454 f2fs_alloc_nid_failed(sbi, new_nid);455 return PTR_ERR(in_page);456 }457 inline_addr = inline_xattr_addr(inode, in_page);458 }459 460 f2fs_wait_on_page_writeback(ipage ? ipage : in_page,461 NODE, true, true);462 /* no need to use xattr node block */463 if (hsize <= inline_size) {464 err = f2fs_truncate_xattr_node(inode);465 f2fs_alloc_nid_failed(sbi, new_nid);466 if (err) {467 f2fs_put_page(in_page, 1);468 return err;469 }470 memcpy(inline_addr, txattr_addr, inline_size);471 set_page_dirty(ipage ? ipage : in_page);472 goto in_page_out;473 }474 }475 476 /* write to xattr node block */477 if (F2FS_I(inode)->i_xattr_nid) {478 xpage = f2fs_get_node_page(sbi, F2FS_I(inode)->i_xattr_nid);479 if (IS_ERR(xpage)) {480 err = PTR_ERR(xpage);481 f2fs_alloc_nid_failed(sbi, new_nid);482 goto in_page_out;483 }484 f2fs_bug_on(sbi, new_nid);485 f2fs_wait_on_page_writeback(xpage, NODE, true, true);486 } else {487 struct dnode_of_data dn;488 489 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);509in_page_out:510 f2fs_put_page(in_page, 1);511 return err;512}513 514int 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;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 if (!ipage)532 f2fs_down_read(&F2FS_I(inode)->i_xattr_sem);533 error = lookup_all_xattrs(inode, ipage, index, len, name,534 &entry, &base_addr, &base_size, &is_inline);535 if (!ipage)536 f2fs_up_read(&F2FS_I(inode)->i_xattr_sem);537 if (error)538 return error;539 540 size = le16_to_cpu(entry->e_value_size);541 542 if (buffer && size > buffer_size) {543 error = -ERANGE;544 goto out;545 }546 547 if (buffer) {548 char *pval = entry->e_name + entry->e_name_len;549 550 if (base_size - (pval - (char *)base_addr) < size) {551 error = -ERANGE;552 goto out;553 }554 memcpy(buffer, pval, size);555 }556 error = size;557out:558 xattr_free(F2FS_I_SB(inode), base_addr, is_inline);559 return error;560}561 562ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)563{564 struct inode *inode = d_inode(dentry);565 struct f2fs_xattr_entry *entry;566 void *base_addr, *last_base_addr;567 int error;568 size_t rest = buffer_size;569 570 f2fs_down_read(&F2FS_I(inode)->i_xattr_sem);571 error = read_all_xattrs(inode, NULL, &base_addr);572 f2fs_up_read(&F2FS_I(inode)->i_xattr_sem);573 if (error)574 return error;575 576 last_base_addr = (void *)base_addr + XATTR_SIZE(inode);577 578 list_for_each_xattr(entry, base_addr) {579 const char *prefix;580 size_t prefix_len;581 size_t size;582 583 prefix = f2fs_xattr_prefix(entry->e_name_index, dentry);584 585 if ((void *)(entry) + sizeof(__u32) > last_base_addr ||586 (void *)XATTR_NEXT_ENTRY(entry) > last_base_addr) {587 f2fs_err(F2FS_I_SB(inode), "list inode (%lu) has corrupted xattr",588 inode->i_ino);589 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);590 f2fs_handle_error(F2FS_I_SB(inode),591 ERROR_CORRUPTED_XATTR);592 break;593 }594 595 if (!prefix)596 continue;597 598 prefix_len = strlen(prefix);599 size = prefix_len + entry->e_name_len + 1;600 if (buffer) {601 if (size > rest) {602 error = -ERANGE;603 goto cleanup;604 }605 memcpy(buffer, prefix, prefix_len);606 buffer += prefix_len;607 memcpy(buffer, entry->e_name, entry->e_name_len);608 buffer += entry->e_name_len;609 *buffer++ = 0;610 }611 rest -= size;612 }613 error = buffer_size - rest;614cleanup:615 kfree(base_addr);616 return error;617}618 619static bool f2fs_xattr_value_same(struct f2fs_xattr_entry *entry,620 const void *value, size_t size)621{622 void *pval = entry->e_name + entry->e_name_len;623 624 return (le16_to_cpu(entry->e_value_size) == size) &&625 !memcmp(pval, value, size);626}627 628static int __f2fs_setxattr(struct inode *inode, int index,629 const char *name, const void *value, size_t size,630 struct page *ipage, int flags)631{632 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);633 struct f2fs_xattr_entry *here, *last;634 void *base_addr, *last_base_addr;635 int found, newsize;636 size_t len;637 __u32 new_hsize;638 int error;639 640 if (name == NULL)641 return -EINVAL;642 643 if (value == NULL)644 size = 0;645 646 len = strlen(name);647 648 if (len > F2FS_NAME_LEN)649 return -ERANGE;650 651 if (size > MAX_VALUE_LEN(inode))652 return -E2BIG;653retry:654 error = read_all_xattrs(inode, ipage, &base_addr);655 if (error)656 return error;657 658 last_base_addr = (void *)base_addr + XATTR_SIZE(inode);659 660 /* find entry with wanted name. */661 here = __find_xattr(base_addr, last_base_addr, NULL, index, len, name);662 if (!here) {663 if (!F2FS_I(inode)->i_xattr_nid) {664 error = f2fs_recover_xattr_data(inode, NULL);665 f2fs_notice(F2FS_I_SB(inode),666 "recover xattr in inode (%lu), error(%d)",667 inode->i_ino, error);668 if (!error) {669 kfree(base_addr);670 goto retry;671 }672 }673 f2fs_err(F2FS_I_SB(inode), "set inode (%lu) has corrupted xattr",674 inode->i_ino);675 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);676 error = -EFSCORRUPTED;677 f2fs_handle_error(F2FS_I_SB(inode),678 ERROR_CORRUPTED_XATTR);679 goto exit;680 }681 682 found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;683 684 if (found) {685 if ((flags & XATTR_CREATE)) {686 error = -EEXIST;687 goto exit;688 }689 690 if (value && f2fs_xattr_value_same(here, value, size))691 goto same;692 } else if ((flags & XATTR_REPLACE)) {693 error = -ENODATA;694 goto exit;695 }696 697 last = here;698 while (!IS_XATTR_LAST_ENTRY(last)) {699 if ((void *)(last) + sizeof(__u32) > last_base_addr ||700 (void *)XATTR_NEXT_ENTRY(last) > last_base_addr) {701 f2fs_err(F2FS_I_SB(inode), "inode (%lu) has invalid last xattr entry, entry_size: %zu",702 inode->i_ino, ENTRY_SIZE(last));703 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);704 error = -EFSCORRUPTED;705 f2fs_handle_error(F2FS_I_SB(inode),706 ERROR_CORRUPTED_XATTR);707 goto exit;708 }709 last = XATTR_NEXT_ENTRY(last);710 }711 712 newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size);713 714 /* 1. Check space */715 if (value) {716 int free;717 /*718 * If value is NULL, it is remove operation.719 * In case of update operation, we calculate free.720 */721 free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr);722 if (found)723 free = free + ENTRY_SIZE(here);724 725 if (unlikely(free < newsize)) {726 error = -E2BIG;727 goto exit;728 }729 }730 731 /* 2. Remove old entry */732 if (found) {733 /*734 * If entry is found, remove old entry.735 * If not found, remove operation is not needed.736 */737 struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);738 int oldsize = ENTRY_SIZE(here);739 740 memmove(here, next, (char *)last - (char *)next);741 last = (struct f2fs_xattr_entry *)((char *)last - oldsize);742 memset(last, 0, oldsize);743 }744 745 new_hsize = (char *)last - (char *)base_addr;746 747 /* 3. Write new entry */748 if (value) {749 char *pval;750 /*751 * Before we come here, old entry is removed.752 * We just write new entry.753 */754 last->e_name_index = index;755 last->e_name_len = len;756 memcpy(last->e_name, name, len);757 pval = last->e_name + len;758 memcpy(pval, value, size);759 last->e_value_size = cpu_to_le16(size);760 new_hsize += newsize;761 /*762 * Explicitly add the null terminator. The unused xattr space763 * is supposed to always be zeroed, which would make this764 * unnecessary, but don't depend on that.765 */766 *(u32 *)((u8 *)last + newsize) = 0;767 }768 769 error = write_all_xattrs(inode, new_hsize, base_addr, ipage);770 if (error)771 goto exit;772 773 if (index == F2FS_XATTR_INDEX_ENCRYPTION &&774 !strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT))775 f2fs_set_encrypted_inode(inode);776 777 if (!S_ISDIR(inode->i_mode))778 goto same;779 /*780 * In restrict mode, fsync() always try to trigger checkpoint for all781 * metadata consistency, in other mode, it triggers checkpoint when782 * parent's xattr metadata was updated.783 */784 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT)785 set_sbi_flag(sbi, SBI_NEED_CP);786 else787 f2fs_add_ino_entry(sbi, inode->i_ino, XATTR_DIR_INO);788same:789 if (is_inode_flag_set(inode, FI_ACL_MODE)) {790 inode->i_mode = F2FS_I(inode)->i_acl_mode;791 clear_inode_flag(inode, FI_ACL_MODE);792 }793 794 inode_set_ctime_current(inode);795 f2fs_mark_inode_dirty_sync(inode, true);796exit:797 kfree(base_addr);798 return error;799}800 801int f2fs_setxattr(struct inode *inode, int index, const char *name,802 const void *value, size_t size,803 struct page *ipage, int flags)804{805 struct f2fs_sb_info *sbi = F2FS_I_SB(inode);806 int err;807 808 if (unlikely(f2fs_cp_error(sbi)))809 return -EIO;810 if (!f2fs_is_checkpoint_ready(sbi))811 return -ENOSPC;812 813 err = f2fs_dquot_initialize(inode);814 if (err)815 return err;816 817 /* this case is only from f2fs_init_inode_metadata */818 if (ipage)819 return __f2fs_setxattr(inode, index, name, value,820 size, ipage, flags);821 f2fs_balance_fs(sbi, true);822 823 f2fs_lock_op(sbi);824 f2fs_down_write(&F2FS_I(inode)->i_xattr_sem);825 err = __f2fs_setxattr(inode, index, name, value, size, ipage, flags);826 f2fs_up_write(&F2FS_I(inode)->i_xattr_sem);827 f2fs_unlock_op(sbi);828 829 f2fs_update_time(sbi, REQ_TIME);830 return err;831}832 833int f2fs_init_xattr_caches(struct f2fs_sb_info *sbi)834{835 dev_t dev = sbi->sb->s_bdev->bd_dev;836 char slab_name[32];837 838 sprintf(slab_name, "f2fs_xattr_entry-%u:%u", MAJOR(dev), MINOR(dev));839 840 sbi->inline_xattr_slab_size = F2FS_OPTION(sbi).inline_xattr_size *841 sizeof(__le32) + XATTR_PADDING_SIZE;842 843 sbi->inline_xattr_slab = f2fs_kmem_cache_create(slab_name,844 sbi->inline_xattr_slab_size);845 if (!sbi->inline_xattr_slab)846 return -ENOMEM;847 848 return 0;849}850 851void f2fs_destroy_xattr_caches(struct f2fs_sb_info *sbi)852{853 kmem_cache_destroy(sbi->inline_xattr_slab);854}855