fs/f2fs/xattr.c

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