fs/f2fs/xattr.c

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