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 #include "segment.h"
  25
  26 static 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
  37 static 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         else
  43                 kfree(xattr_addr);
  44 }
  45
  46 static 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
  67 static 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
  90 static 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
  97 static bool f2fs_xattr_trusted_list(struct dentry *dentry)
  98 {
  99         return capable(CAP_SYS_ADMIN);
 100 }
 101
 102 static 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
 111 static 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_SECURITY
 138 static 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
 154 int 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 #endif
 161
 162 const 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
 170 const 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
 178 const 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
 185 const 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
 192 static const struct xattr_handler * const f2fs_xattr_handler_map[] = {
 193         [F2FS_XATTR_INDEX_USER] = &f2fs_xattr_user_handler,
 194 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 195         [F2FS_XATTR_INDEX_POSIX_ACL_ACCESS] = &nop_posix_acl_access,
 196         [F2FS_XATTR_INDEX_POSIX_ACL_DEFAULT] = &nop_posix_acl_default,
 197 #endif
 198         [F2FS_XATTR_INDEX_TRUSTED] = &f2fs_xattr_trusted_handler,
 199 #ifdef CONFIG_F2FS_FS_SECURITY
 200         [F2FS_XATTR_INDEX_SECURITY] = &f2fs_xattr_security_handler,
 201 #endif
 202         [F2FS_XATTR_INDEX_ADVISE] = &f2fs_xattr_advise_handler,
 203 };
 204
 205 const struct xattr_handler * const f2fs_xattr_handlers[] = {
 206         &f2fs_xattr_user_handler,
 207         &f2fs_xattr_trusted_handler,
 208 #ifdef CONFIG_F2FS_FS_SECURITY
 209         &f2fs_xattr_security_handler,
 210 #endif
 211         &f2fs_xattr_advise_handler,
 212         NULL,
 213 };
 214
 215 static 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
 229 static 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
 253 static 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
 274 static 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
 297 static 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
 317 static 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         else
 363                 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         }
 375 check:
 376         if (IS_XATTR_LAST_ENTRY(*xe)) {
 377                 err = -ENODATA;
 378                 goto out;
 379         }
 380
 381         *base_addr = txattr_addr;
 382         return 0;
 383 out:
 384         xattr_free(F2FS_I_SB(inode), txattr_addr, *is_inline);
 385         return err;
 386 }
 387
 388 static 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;
 426 fail:
 427         kfree(txattr_addr);
 428         return err;
 429 }
 430
 431 static 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);
 509 in_page_out:
 510         f2fs_put_page(in_page, 1);
 511         return err;
 512 }
 513
 514 int 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;
 557 out:
 558         xattr_free(F2FS_I_SB(inode), base_addr, is_inline);
 559         return error;
 560 }
 561
 562 ssize_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;
 614 cleanup:
 615         kfree(base_addr);
 616         return error;
 617 }
 618
 619 static 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
 628 static 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_xattr_entry *here, *last;
 633         void *base_addr, *last_base_addr;
 634         int found, newsize;
 635         size_t len;
 636         __u32 new_hsize;
 637         int error;
 638
 639         if (name == NULL)
 640                 return -EINVAL;
 641
 642         if (value == NULL)
 643                 size = 0;
 644
 645         len = strlen(name);
 646
 647         if (len > F2FS_NAME_LEN)
 648                 return -ERANGE;
 649
 650         if (size > MAX_VALUE_LEN(inode))
 651                 return -E2BIG;
 652 retry:
 653         error = read_all_xattrs(inode, ipage, &base_addr);
 654         if (error)
 655                 return error;
 656
 657         last_base_addr = (void *)base_addr + XATTR_SIZE(inode);
 658
 659         /* find entry with wanted name. */
 660         here = __find_xattr(base_addr, last_base_addr, NULL, index, len, name);
 661         if (!here) {
 662                 if (!F2FS_I(inode)->i_xattr_nid) {
 663                         f2fs_notice(F2FS_I_SB(inode),
 664                                 "recover xattr in inode (%lu)", inode->i_ino);
 665                         f2fs_recover_xattr_data(inode, NULL);
 666                         kfree(base_addr);
 667                         goto retry;
 668                 }
 669                 f2fs_err(F2FS_I_SB(inode), "set inode (%lu) has corrupted xattr",
 670                                                                 inode->i_ino);
 671                 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
 672                 error = -EFSCORRUPTED;
 673                 f2fs_handle_error(F2FS_I_SB(inode),
 674                                         ERROR_CORRUPTED_XATTR);
 675                 goto exit;
 676         }
 677
 678         found = IS_XATTR_LAST_ENTRY(here) ? 0 : 1;
 679
 680         if (found) {
 681                 if ((flags & XATTR_CREATE)) {
 682                         error = -EEXIST;
 683                         goto exit;
 684                 }
 685
 686                 if (value && f2fs_xattr_value_same(here, value, size))
 687                         goto same;
 688         } else if ((flags & XATTR_REPLACE)) {
 689                 error = -ENODATA;
 690                 goto exit;
 691         }
 692
 693         last = here;
 694         while (!IS_XATTR_LAST_ENTRY(last)) {
 695                 if ((void *)(last) + sizeof(__u32) > last_base_addr ||
 696                         (void *)XATTR_NEXT_ENTRY(last) > last_base_addr) {
 697                         f2fs_err(F2FS_I_SB(inode), "inode (%lu) has invalid last xattr entry, entry_size: %zu",
 698                                         inode->i_ino, ENTRY_SIZE(last));
 699                         set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
 700                         error = -EFSCORRUPTED;
 701                         f2fs_handle_error(F2FS_I_SB(inode),
 702                                                 ERROR_CORRUPTED_XATTR);
 703                         goto exit;
 704                 }
 705                 last = XATTR_NEXT_ENTRY(last);
 706         }
 707
 708         newsize = XATTR_ALIGN(sizeof(struct f2fs_xattr_entry) + len + size);
 709
 710         /* 1. Check space */
 711         if (value) {
 712                 int free;
 713                 /*
 714                  * If value is NULL, it is remove operation.
 715                  * In case of update operation, we calculate free.
 716                  */
 717                 free = MIN_OFFSET(inode) - ((char *)last - (char *)base_addr);
 718                 if (found)
 719                         free = free + ENTRY_SIZE(here);
 720
 721                 if (unlikely(free < newsize)) {
 722                         error = -E2BIG;
 723                         goto exit;
 724                 }
 725         }
 726
 727         /* 2. Remove old entry */
 728         if (found) {
 729                 /*
 730                  * If entry is found, remove old entry.
 731                  * If not found, remove operation is not needed.
 732                  */
 733                 struct f2fs_xattr_entry *next = XATTR_NEXT_ENTRY(here);
 734                 int oldsize = ENTRY_SIZE(here);
 735
 736                 memmove(here, next, (char *)last - (char *)next);
 737                 last = (struct f2fs_xattr_entry *)((char *)last - oldsize);
 738                 memset(last, 0, oldsize);
 739         }
 740
 741         new_hsize = (char *)last - (char *)base_addr;
 742
 743         /* 3. Write new entry */
 744         if (value) {
 745                 char *pval;
 746                 /*
 747                  * Before we come here, old entry is removed.
 748                  * We just write new entry.
 749                  */
 750                 last->e_name_index = index;
 751                 last->e_name_len = len;
 752                 memcpy(last->e_name, name, len);
 753                 pval = last->e_name + len;
 754                 memcpy(pval, value, size);
 755                 last->e_value_size = cpu_to_le16(size);
 756                 new_hsize += newsize;
 757         }
 758
 759         error = write_all_xattrs(inode, new_hsize, base_addr, ipage);
 760         if (error)
 761                 goto exit;
 762
 763         if (index == F2FS_XATTR_INDEX_ENCRYPTION &&
 764                         !strcmp(name, F2FS_XATTR_NAME_ENCRYPTION_CONTEXT))
 765                 f2fs_set_encrypted_inode(inode);
 766         if (S_ISDIR(inode->i_mode))
 767                 set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_CP);
 768
 769 same:
 770         if (is_inode_flag_set(inode, FI_ACL_MODE)) {
 771                 inode->i_mode = F2FS_I(inode)->i_acl_mode;
 772                 clear_inode_flag(inode, FI_ACL_MODE);
 773         }
 774
 775         inode_set_ctime_current(inode);
 776         f2fs_mark_inode_dirty_sync(inode, true);
 777 exit:
 778         kfree(base_addr);
 779         return error;
 780 }
 781
 782 int f2fs_setxattr(struct inode *inode, int index, const char *name,
 783                                 const void *value, size_t size,
 784                                 struct page *ipage, int flags)
 785 {
 786         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 787         int err;
 788
 789         if (unlikely(f2fs_cp_error(sbi)))
 790                 return -EIO;
 791         if (!f2fs_is_checkpoint_ready(sbi))
 792                 return -ENOSPC;
 793
 794         err = f2fs_dquot_initialize(inode);
 795         if (err)
 796                 return err;
 797
 798         /* this case is only from f2fs_init_inode_metadata */
 799         if (ipage)
 800                 return __f2fs_setxattr(inode, index, name, value,
 801                                                 size, ipage, flags);
 802         f2fs_balance_fs(sbi, true);
 803
 804         f2fs_lock_op(sbi);
 805         f2fs_down_write(&F2FS_I(inode)->i_xattr_sem);
 806         err = __f2fs_setxattr(inode, index, name, value, size, ipage, flags);
 807         f2fs_up_write(&F2FS_I(inode)->i_xattr_sem);
 808         f2fs_unlock_op(sbi);
 809
 810         f2fs_update_time(sbi, REQ_TIME);
 811         return err;
 812 }
 813
 814 int f2fs_init_xattr_caches(struct f2fs_sb_info *sbi)
 815 {
 816         dev_t dev = sbi->sb->s_bdev->bd_dev;
 817         char slab_name[32];
 818
 819         sprintf(slab_name, "f2fs_xattr_entry-%u:%u", MAJOR(dev), MINOR(dev));
 820
 821         sbi->inline_xattr_slab_size = F2FS_OPTION(sbi).inline_xattr_size *
 822                                         sizeof(__le32) + XATTR_PADDING_SIZE;
 823
 824         sbi->inline_xattr_slab = f2fs_kmem_cache_create(slab_name,
 825                                         sbi->inline_xattr_slab_size);
 826         if (!sbi->inline_xattr_slab)
 827                 return -ENOMEM;
 828
 829         return 0;
 830 }
 831
 832 void f2fs_destroy_xattr_caches(struct f2fs_sb_info *sbi)
 833 {
 834         kmem_cache_destroy(sbi->inline_xattr_slab);
 835 }