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