fs/hfsplus/xattr.c

   1 /*
   2  * linux/fs/hfsplus/xattr.c
   3  *
   4  * Vyacheslav Dubeyko <slava@dubeyko.com>
   5  *
   6  * Logic of processing extended attributes
   7  */
   8
   9 #include "hfsplus_fs.h"
  10 #include "xattr.h"
  11 #include "acl.h"
  12
  13 const struct xattr_handler *hfsplus_xattr_handlers[] = {
  14         &hfsplus_xattr_osx_handler,
  15         &hfsplus_xattr_user_handler,
  16         &hfsplus_xattr_trusted_handler,
  17 #ifdef CONFIG_HFSPLUS_FS_POSIX_ACL
  18         &hfsplus_xattr_acl_access_handler,
  19         &hfsplus_xattr_acl_default_handler,
  20 #endif
  21         &hfsplus_xattr_security_handler,
  22         NULL
  23 };
  24
  25 static int strcmp_xattr_finder_info(const char *name)
  26 {
  27         if (name) {
  28                 return strncmp(name, HFSPLUS_XATTR_FINDER_INFO_NAME,
  29                                 sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME));
  30         }
  31         return -1;
  32 }
  33
  34 static int strcmp_xattr_acl(const char *name)
  35 {
  36         if (name) {
  37                 return strncmp(name, HFSPLUS_XATTR_ACL_NAME,
  38                                 sizeof(HFSPLUS_XATTR_ACL_NAME));
  39         }
  40         return -1;
  41 }
  42
  43 static inline int is_known_namespace(const char *name)
  44 {
  45         if (strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) &&
  46             strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) &&
  47             strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) &&
  48             strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN))
  49                 return false;
  50
  51         return true;
  52 }
  53
  54 static int can_set_system_xattr(struct inode *inode, const char *name,
  55                                 const void *value, size_t size)
  56 {
  57 #ifdef CONFIG_HFSPLUS_FS_POSIX_ACL
  58         struct posix_acl *acl;
  59         int err;
  60
  61         if (!inode_owner_or_capable(inode))
  62                 return -EPERM;
  63
  64         /*
  65          * POSIX_ACL_XATTR_ACCESS is tied to i_mode
  66          */
  67         if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0) {
  68                 acl = posix_acl_from_xattr(&init_user_ns, value, size);
  69                 if (IS_ERR(acl))
  70                         return PTR_ERR(acl);
  71                 if (acl) {
  72                         err = posix_acl_equiv_mode(acl, &inode->i_mode);
  73                         posix_acl_release(acl);
  74                         if (err < 0)
  75                                 return err;
  76                         mark_inode_dirty(inode);
  77                 }
  78                 /*
  79                  * We're changing the ACL.  Get rid of the cached one
  80                  */
  81                 forget_cached_acl(inode, ACL_TYPE_ACCESS);
  82
  83                 return 0;
  84         } else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0) {
  85                 acl = posix_acl_from_xattr(&init_user_ns, value, size);
  86                 if (IS_ERR(acl))
  87                         return PTR_ERR(acl);
  88                 posix_acl_release(acl);
  89
  90                 /*
  91                  * We're changing the default ACL.  Get rid of the cached one
  92                  */
  93                 forget_cached_acl(inode, ACL_TYPE_DEFAULT);
  94
  95                 return 0;
  96         }
  97 #endif /* CONFIG_HFSPLUS_FS_POSIX_ACL */
  98         return -EOPNOTSUPP;
  99 }
 100
 101 static int can_set_xattr(struct inode *inode, const char *name,
 102                                 const void *value, size_t value_len)
 103 {
 104         if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
 105                 return can_set_system_xattr(inode, name, value, value_len);
 106
 107         if (!strncmp(name, XATTR_MAC_OSX_PREFIX, XATTR_MAC_OSX_PREFIX_LEN)) {
 108                 /*
 109                  * This makes sure that we aren't trying to set an
 110                  * attribute in a different namespace by prefixing it
 111                  * with "osx."
 112                  */
 113                 if (is_known_namespace(name + XATTR_MAC_OSX_PREFIX_LEN))
 114                         return -EOPNOTSUPP;
 115
 116                 return 0;
 117         }
 118
 119         /*
 120          * Don't allow setting an attribute in an unknown namespace.
 121          */
 122         if (strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) &&
 123             strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) &&
 124             strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
 125                 return -EOPNOTSUPP;
 126
 127         return 0;
 128 }
 129
 130 int __hfsplus_setxattr(struct inode *inode, const char *name,
 131                         const void *value, size_t size, int flags)
 132 {
 133         int err = 0;
 134         struct hfs_find_data cat_fd;
 135         hfsplus_cat_entry entry;
 136         u16 cat_entry_flags, cat_entry_type;
 137         u16 folder_finderinfo_len = sizeof(struct DInfo) +
 138                                         sizeof(struct DXInfo);
 139         u16 file_finderinfo_len = sizeof(struct FInfo) +
 140                                         sizeof(struct FXInfo);
 141
 142         if ((!S_ISREG(inode->i_mode) &&
 143                         !S_ISDIR(inode->i_mode)) ||
 144                                 HFSPLUS_IS_RSRC(inode))
 145                 return -EOPNOTSUPP;
 146
 147         err = can_set_xattr(inode, name, value, size);
 148         if (err)
 149                 return err;
 150
 151         if (strncmp(name, XATTR_MAC_OSX_PREFIX,
 152                                 XATTR_MAC_OSX_PREFIX_LEN) == 0)
 153                 name += XATTR_MAC_OSX_PREFIX_LEN;
 154
 155         if (value == NULL) {
 156                 value = "";
 157                 size = 0;
 158         }
 159
 160         err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd);
 161         if (err) {
 162                 pr_err("can't init xattr find struct\n");
 163                 return err;
 164         }
 165
 166         err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd);
 167         if (err) {
 168                 pr_err("catalog searching failed\n");
 169                 goto end_setxattr;
 170         }
 171
 172         if (!strcmp_xattr_finder_info(name)) {
 173                 if (flags & XATTR_CREATE) {
 174                         pr_err("xattr exists yet\n");
 175                         err = -EOPNOTSUPP;
 176                         goto end_setxattr;
 177                 }
 178                 hfs_bnode_read(cat_fd.bnode, &entry, cat_fd.entryoffset,
 179                                         sizeof(hfsplus_cat_entry));
 180                 if (be16_to_cpu(entry.type) == HFSPLUS_FOLDER) {
 181                         if (size == folder_finderinfo_len) {
 182                                 memcpy(&entry.folder.user_info, value,
 183                                                 folder_finderinfo_len);
 184                                 hfs_bnode_write(cat_fd.bnode, &entry,
 185                                         cat_fd.entryoffset,
 186                                         sizeof(struct hfsplus_cat_folder));
 187                                 hfsplus_mark_inode_dirty(inode,
 188                                                 HFSPLUS_I_CAT_DIRTY);
 189                         } else {
 190                                 err = -ERANGE;
 191                                 goto end_setxattr;
 192                         }
 193                 } else if (be16_to_cpu(entry.type) == HFSPLUS_FILE) {
 194                         if (size == file_finderinfo_len) {
 195                                 memcpy(&entry.file.user_info, value,
 196                                                 file_finderinfo_len);
 197                                 hfs_bnode_write(cat_fd.bnode, &entry,
 198                                         cat_fd.entryoffset,
 199                                         sizeof(struct hfsplus_cat_file));
 200                                 hfsplus_mark_inode_dirty(inode,
 201                                                 HFSPLUS_I_CAT_DIRTY);
 202                         } else {
 203                                 err = -ERANGE;
 204                                 goto end_setxattr;
 205                         }
 206                 } else {
 207                         err = -EOPNOTSUPP;
 208                         goto end_setxattr;
 209                 }
 210                 goto end_setxattr;
 211         }
 212
 213         if (!HFSPLUS_SB(inode->i_sb)->attr_tree) {
 214                 err = -EOPNOTSUPP;
 215                 goto end_setxattr;
 216         }
 217
 218         if (hfsplus_attr_exists(inode, name)) {
 219                 if (flags & XATTR_CREATE) {
 220                         pr_err("xattr exists yet\n");
 221                         err = -EOPNOTSUPP;
 222                         goto end_setxattr;
 223                 }
 224                 err = hfsplus_delete_attr(inode, name);
 225                 if (err)
 226                         goto end_setxattr;
 227                 err = hfsplus_create_attr(inode, name, value, size);
 228                 if (err)
 229                         goto end_setxattr;
 230         } else {
 231                 if (flags & XATTR_REPLACE) {
 232                         pr_err("cannot replace xattr\n");
 233                         err = -EOPNOTSUPP;
 234                         goto end_setxattr;
 235                 }
 236                 err = hfsplus_create_attr(inode, name, value, size);
 237                 if (err)
 238                         goto end_setxattr;
 239         }
 240
 241         cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset);
 242         if (cat_entry_type == HFSPLUS_FOLDER) {
 243                 cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode,
 244                                     cat_fd.entryoffset +
 245                                     offsetof(struct hfsplus_cat_folder, flags));
 246                 cat_entry_flags |= HFSPLUS_XATTR_EXISTS;
 247                 if (!strcmp_xattr_acl(name))
 248                         cat_entry_flags |= HFSPLUS_ACL_EXISTS;
 249                 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
 250                                 offsetof(struct hfsplus_cat_folder, flags),
 251                                 cat_entry_flags);
 252                 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
 253         } else if (cat_entry_type == HFSPLUS_FILE) {
 254                 cat_entry_flags = hfs_bnode_read_u16(cat_fd.bnode,
 255                                     cat_fd.entryoffset +
 256                                     offsetof(struct hfsplus_cat_file, flags));
 257                 cat_entry_flags |= HFSPLUS_XATTR_EXISTS;
 258                 if (!strcmp_xattr_acl(name))
 259                         cat_entry_flags |= HFSPLUS_ACL_EXISTS;
 260                 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
 261                                     offsetof(struct hfsplus_cat_file, flags),
 262                                     cat_entry_flags);
 263                 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
 264         } else {
 265                 pr_err("invalid catalog entry type\n");
 266                 err = -EIO;
 267                 goto end_setxattr;
 268         }
 269
 270 end_setxattr:
 271         hfs_find_exit(&cat_fd);
 272         return err;
 273 }
 274
 275 static inline int is_osx_xattr(const char *xattr_name)
 276 {
 277         return !is_known_namespace(xattr_name);
 278 }
 279
 280 static int name_len(const char *xattr_name, int xattr_name_len)
 281 {
 282         int len = xattr_name_len + 1;
 283
 284         if (is_osx_xattr(xattr_name))
 285                 len += XATTR_MAC_OSX_PREFIX_LEN;
 286
 287         return len;
 288 }
 289
 290 static int copy_name(char *buffer, const char *xattr_name, int name_len)
 291 {
 292         int len = name_len;
 293         int offset = 0;
 294
 295         if (is_osx_xattr(xattr_name)) {
 296                 strncpy(buffer, XATTR_MAC_OSX_PREFIX, XATTR_MAC_OSX_PREFIX_LEN);
 297                 offset += XATTR_MAC_OSX_PREFIX_LEN;
 298                 len += XATTR_MAC_OSX_PREFIX_LEN;
 299         }
 300
 301         strncpy(buffer + offset, xattr_name, name_len);
 302         memset(buffer + offset + name_len, 0, 1);
 303         len += 1;
 304
 305         return len;
 306 }
 307
 308 static ssize_t hfsplus_getxattr_finder_info(struct inode *inode,
 309                                                 void *value, size_t size)
 310 {
 311         ssize_t res = 0;
 312         struct hfs_find_data fd;
 313         u16 entry_type;
 314         u16 folder_rec_len = sizeof(struct DInfo) + sizeof(struct DXInfo);
 315         u16 file_rec_len = sizeof(struct FInfo) + sizeof(struct FXInfo);
 316         u16 record_len = max(folder_rec_len, file_rec_len);
 317         u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)];
 318         u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)];
 319
 320         if (size >= record_len) {
 321                 res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
 322                 if (res) {
 323                         pr_err("can't init xattr find struct\n");
 324                         return res;
 325                 }
 326                 res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
 327                 if (res)
 328                         goto end_getxattr_finder_info;
 329                 entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
 330
 331                 if (entry_type == HFSPLUS_FOLDER) {
 332                         hfs_bnode_read(fd.bnode, folder_finder_info,
 333                                 fd.entryoffset +
 334                                 offsetof(struct hfsplus_cat_folder, user_info),
 335                                 folder_rec_len);
 336                         memcpy(value, folder_finder_info, folder_rec_len);
 337                         res = folder_rec_len;
 338                 } else if (entry_type == HFSPLUS_FILE) {
 339                         hfs_bnode_read(fd.bnode, file_finder_info,
 340                                 fd.entryoffset +
 341                                 offsetof(struct hfsplus_cat_file, user_info),
 342                                 file_rec_len);
 343                         memcpy(value, file_finder_info, file_rec_len);
 344                         res = file_rec_len;
 345                 } else {
 346                         res = -EOPNOTSUPP;
 347                         goto end_getxattr_finder_info;
 348                 }
 349         } else
 350                 res = size ? -ERANGE : record_len;
 351
 352 end_getxattr_finder_info:
 353         if (size >= record_len)
 354                 hfs_find_exit(&fd);
 355         return res;
 356 }
 357
 358 ssize_t __hfsplus_getxattr(struct inode *inode, const char *name,
 359                          void *value, size_t size)
 360 {
 361         struct hfs_find_data fd;
 362         hfsplus_attr_entry *entry;
 363         __be32 xattr_record_type;
 364         u32 record_type;
 365         u16 record_length = 0;
 366         ssize_t res = 0;
 367
 368         if ((!S_ISREG(inode->i_mode) &&
 369                         !S_ISDIR(inode->i_mode)) ||
 370                                 HFSPLUS_IS_RSRC(inode))
 371                 return -EOPNOTSUPP;
 372
 373         if (strncmp(name, XATTR_MAC_OSX_PREFIX,
 374                                 XATTR_MAC_OSX_PREFIX_LEN) == 0) {
 375                 /* skip "osx." prefix */
 376                 name += XATTR_MAC_OSX_PREFIX_LEN;
 377                 /*
 378                  * Don't allow retrieving properly prefixed attributes
 379                  * by prepending them with "osx."
 380                  */
 381                 if (is_known_namespace(name))
 382                         return -EOPNOTSUPP;
 383         }
 384
 385         if (!strcmp_xattr_finder_info(name))
 386                 return hfsplus_getxattr_finder_info(inode, value, size);
 387
 388         if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
 389                 return -EOPNOTSUPP;
 390
 391         entry = hfsplus_alloc_attr_entry();
 392         if (!entry) {
 393                 pr_err("can't allocate xattr entry\n");
 394                 return -ENOMEM;
 395         }
 396
 397         res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd);
 398         if (res) {
 399                 pr_err("can't init xattr find struct\n");
 400                 goto failed_getxattr_init;
 401         }
 402
 403         res = hfsplus_find_attr(inode->i_sb, inode->i_ino, name, &fd);
 404         if (res) {
 405                 if (res == -ENOENT)
 406                         res = -ENODATA;
 407                 else
 408                         pr_err("xattr searching failed\n");
 409                 goto out;
 410         }
 411
 412         hfs_bnode_read(fd.bnode, &xattr_record_type,
 413                         fd.entryoffset, sizeof(xattr_record_type));
 414         record_type = be32_to_cpu(xattr_record_type);
 415         if (record_type == HFSPLUS_ATTR_INLINE_DATA) {
 416                 record_length = hfs_bnode_read_u16(fd.bnode,
 417                                 fd.entryoffset +
 418                                 offsetof(struct hfsplus_attr_inline_data,
 419                                 length));
 420                 if (record_length > HFSPLUS_MAX_INLINE_DATA_SIZE) {
 421                         pr_err("invalid xattr record size\n");
 422                         res = -EIO;
 423                         goto out;
 424                 }
 425         } else if (record_type == HFSPLUS_ATTR_FORK_DATA ||
 426                         record_type == HFSPLUS_ATTR_EXTENTS) {
 427                 pr_err("only inline data xattr are supported\n");
 428                 res = -EOPNOTSUPP;
 429                 goto out;
 430         } else {
 431                 pr_err("invalid xattr record\n");
 432                 res = -EIO;
 433                 goto out;
 434         }
 435
 436         if (size) {
 437                 hfs_bnode_read(fd.bnode, entry, fd.entryoffset,
 438                                 offsetof(struct hfsplus_attr_inline_data,
 439                                         raw_bytes) + record_length);
 440         }
 441
 442         if (size >= record_length) {
 443                 memcpy(value, entry->inline_data.raw_bytes, record_length);
 444                 res = record_length;
 445         } else
 446                 res = size ? -ERANGE : record_length;
 447
 448 out:
 449         hfs_find_exit(&fd);
 450
 451 failed_getxattr_init:
 452         hfsplus_destroy_attr_entry(entry);
 453         return res;
 454 }
 455
 456 static inline int can_list(const char *xattr_name)
 457 {
 458         if (!xattr_name)
 459                 return 0;
 460
 461         return strncmp(xattr_name, XATTR_TRUSTED_PREFIX,
 462                         XATTR_TRUSTED_PREFIX_LEN) ||
 463                                 capable(CAP_SYS_ADMIN);
 464 }
 465
 466 static ssize_t hfsplus_listxattr_finder_info(struct dentry *dentry,
 467                                                 char *buffer, size_t size)
 468 {
 469         ssize_t res = 0;
 470         struct inode *inode = dentry->d_inode;
 471         struct hfs_find_data fd;
 472         u16 entry_type;
 473         u8 folder_finder_info[sizeof(struct DInfo) + sizeof(struct DXInfo)];
 474         u8 file_finder_info[sizeof(struct FInfo) + sizeof(struct FXInfo)];
 475         unsigned long len, found_bit;
 476         int xattr_name_len, symbols_count;
 477
 478         res = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd);
 479         if (res) {
 480                 pr_err("can't init xattr find struct\n");
 481                 return res;
 482         }
 483
 484         res = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd);
 485         if (res)
 486                 goto end_listxattr_finder_info;
 487
 488         entry_type = hfs_bnode_read_u16(fd.bnode, fd.entryoffset);
 489         if (entry_type == HFSPLUS_FOLDER) {
 490                 len = sizeof(struct DInfo) + sizeof(struct DXInfo);
 491                 hfs_bnode_read(fd.bnode, folder_finder_info,
 492                                 fd.entryoffset +
 493                                 offsetof(struct hfsplus_cat_folder, user_info),
 494                                 len);
 495                 found_bit = find_first_bit((void *)folder_finder_info, len*8);
 496         } else if (entry_type == HFSPLUS_FILE) {
 497                 len = sizeof(struct FInfo) + sizeof(struct FXInfo);
 498                 hfs_bnode_read(fd.bnode, file_finder_info,
 499                                 fd.entryoffset +
 500                                 offsetof(struct hfsplus_cat_file, user_info),
 501                                 len);
 502                 found_bit = find_first_bit((void *)file_finder_info, len*8);
 503         } else {
 504                 res = -EOPNOTSUPP;
 505                 goto end_listxattr_finder_info;
 506         }
 507
 508         if (found_bit >= (len*8))
 509                 res = 0;
 510         else {
 511                 symbols_count = sizeof(HFSPLUS_XATTR_FINDER_INFO_NAME) - 1;
 512                 xattr_name_len =
 513                         name_len(HFSPLUS_XATTR_FINDER_INFO_NAME, symbols_count);
 514                 if (!buffer || !size) {
 515                         if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME))
 516                                 res = xattr_name_len;
 517                 } else if (can_list(HFSPLUS_XATTR_FINDER_INFO_NAME)) {
 518                         if (size < xattr_name_len)
 519                                 res = -ERANGE;
 520                         else {
 521                                 res = copy_name(buffer,
 522                                                 HFSPLUS_XATTR_FINDER_INFO_NAME,
 523                                                 symbols_count);
 524                         }
 525                 }
 526         }
 527
 528 end_listxattr_finder_info:
 529         hfs_find_exit(&fd);
 530
 531         return res;
 532 }
 533
 534 ssize_t hfsplus_listxattr(struct dentry *dentry, char *buffer, size_t size)
 535 {
 536         ssize_t err;
 537         ssize_t res = 0;
 538         struct inode *inode = dentry->d_inode;
 539         struct hfs_find_data fd;
 540         u16 key_len = 0;
 541         struct hfsplus_attr_key attr_key;
 542         char strbuf[HFSPLUS_ATTR_MAX_STRLEN +
 543                         XATTR_MAC_OSX_PREFIX_LEN + 1] = {0};
 544         int xattr_name_len;
 545
 546         if ((!S_ISREG(inode->i_mode) &&
 547                         !S_ISDIR(inode->i_mode)) ||
 548                                 HFSPLUS_IS_RSRC(inode))
 549                 return -EOPNOTSUPP;
 550
 551         res = hfsplus_listxattr_finder_info(dentry, buffer, size);
 552         if (res < 0)
 553                 return res;
 554         else if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
 555                 return (res == 0) ? -EOPNOTSUPP : res;
 556
 557         err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->attr_tree, &fd);
 558         if (err) {
 559                 pr_err("can't init xattr find struct\n");
 560                 return err;
 561         }
 562
 563         err = hfsplus_find_attr(inode->i_sb, inode->i_ino, NULL, &fd);
 564         if (err) {
 565                 if (err == -ENOENT) {
 566                         if (res == 0)
 567                                 res = -ENODATA;
 568                         goto end_listxattr;
 569                 } else {
 570                         res = err;
 571                         goto end_listxattr;
 572                 }
 573         }
 574
 575         for (;;) {
 576                 key_len = hfs_bnode_read_u16(fd.bnode, fd.keyoffset);
 577                 if (key_len == 0 || key_len > fd.tree->max_key_len) {
 578                         pr_err("invalid xattr key length: %d\n", key_len);
 579                         res = -EIO;
 580                         goto end_listxattr;
 581                 }
 582
 583                 hfs_bnode_read(fd.bnode, &attr_key,
 584                                 fd.keyoffset, key_len + sizeof(key_len));
 585
 586                 if (be32_to_cpu(attr_key.cnid) != inode->i_ino)
 587                         goto end_listxattr;
 588
 589                 xattr_name_len = HFSPLUS_ATTR_MAX_STRLEN;
 590                 if (hfsplus_uni2asc(inode->i_sb,
 591                         (const struct hfsplus_unistr *)&fd.key->attr.key_name,
 592                                         strbuf, &xattr_name_len)) {
 593                         pr_err("unicode conversion failed\n");
 594                         res = -EIO;
 595                         goto end_listxattr;
 596                 }
 597
 598                 if (!buffer || !size) {
 599                         if (can_list(strbuf))
 600                                 res += name_len(strbuf, xattr_name_len);
 601                 } else if (can_list(strbuf)) {
 602                         if (size < (res + name_len(strbuf, xattr_name_len))) {
 603                                 res = -ERANGE;
 604                                 goto end_listxattr;
 605                         } else
 606                                 res += copy_name(buffer + res,
 607                                                 strbuf, xattr_name_len);
 608                 }
 609
 610                 if (hfs_brec_goto(&fd, 1))
 611                         goto end_listxattr;
 612         }
 613
 614 end_listxattr:
 615         hfs_find_exit(&fd);
 616         return res;
 617 }
 618
 619 int hfsplus_removexattr(struct dentry *dentry, const char *name)
 620 {
 621         int err = 0;
 622         struct inode *inode = dentry->d_inode;
 623         struct hfs_find_data cat_fd;
 624         u16 flags;
 625         u16 cat_entry_type;
 626         int is_xattr_acl_deleted = 0;
 627         int is_all_xattrs_deleted = 0;
 628
 629         if ((!S_ISREG(inode->i_mode) &&
 630                         !S_ISDIR(inode->i_mode)) ||
 631                                 HFSPLUS_IS_RSRC(inode))
 632                 return -EOPNOTSUPP;
 633
 634         if (!HFSPLUS_SB(inode->i_sb)->attr_tree)
 635                 return -EOPNOTSUPP;
 636
 637         err = can_set_xattr(inode, name, NULL, 0);
 638         if (err)
 639                 return err;
 640
 641         if (strncmp(name, XATTR_MAC_OSX_PREFIX,
 642                                 XATTR_MAC_OSX_PREFIX_LEN) == 0)
 643                 name += XATTR_MAC_OSX_PREFIX_LEN;
 644
 645         if (!strcmp_xattr_finder_info(name))
 646                 return -EOPNOTSUPP;
 647
 648         err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &cat_fd);
 649         if (err) {
 650                 pr_err("can't init xattr find struct\n");
 651                 return err;
 652         }
 653
 654         err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &cat_fd);
 655         if (err) {
 656                 pr_err("catalog searching failed\n");
 657                 goto end_removexattr;
 658         }
 659
 660         err = hfsplus_delete_attr(inode, name);
 661         if (err)
 662                 goto end_removexattr;
 663
 664         is_xattr_acl_deleted = !strcmp_xattr_acl(name);
 665         is_all_xattrs_deleted = !hfsplus_attr_exists(inode, NULL);
 666
 667         if (!is_xattr_acl_deleted && !is_all_xattrs_deleted)
 668                 goto end_removexattr;
 669
 670         cat_entry_type = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset);
 671
 672         if (cat_entry_type == HFSPLUS_FOLDER) {
 673                 flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset +
 674                                 offsetof(struct hfsplus_cat_folder, flags));
 675                 if (is_xattr_acl_deleted)
 676                         flags &= ~HFSPLUS_ACL_EXISTS;
 677                 if (is_all_xattrs_deleted)
 678                         flags &= ~HFSPLUS_XATTR_EXISTS;
 679                 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
 680                                 offsetof(struct hfsplus_cat_folder, flags),
 681                                 flags);
 682                 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
 683         } else if (cat_entry_type == HFSPLUS_FILE) {
 684                 flags = hfs_bnode_read_u16(cat_fd.bnode, cat_fd.entryoffset +
 685                                 offsetof(struct hfsplus_cat_file, flags));
 686                 if (is_xattr_acl_deleted)
 687                         flags &= ~HFSPLUS_ACL_EXISTS;
 688                 if (is_all_xattrs_deleted)
 689                         flags &= ~HFSPLUS_XATTR_EXISTS;
 690                 hfs_bnode_write_u16(cat_fd.bnode, cat_fd.entryoffset +
 691                                 offsetof(struct hfsplus_cat_file, flags),
 692                                 flags);
 693                 hfsplus_mark_inode_dirty(inode, HFSPLUS_I_CAT_DIRTY);
 694         } else {
 695                 pr_err("invalid catalog entry type\n");
 696                 err = -EIO;
 697                 goto end_removexattr;
 698         }
 699
 700 end_removexattr:
 701         hfs_find_exit(&cat_fd);
 702         return err;
 703 }
 704
 705 static int hfsplus_osx_getxattr(struct dentry *dentry, const char *name,
 706                                         void *buffer, size_t size, int type)
 707 {
 708         char xattr_name[HFSPLUS_ATTR_MAX_STRLEN +
 709                                 XATTR_MAC_OSX_PREFIX_LEN + 1] = {0};
 710         size_t len = strlen(name);
 711
 712         if (!strcmp(name, ""))
 713                 return -EINVAL;
 714
 715         if (len > HFSPLUS_ATTR_MAX_STRLEN)
 716                 return -EOPNOTSUPP;
 717
 718         strcpy(xattr_name, XATTR_MAC_OSX_PREFIX);
 719         strcpy(xattr_name + XATTR_MAC_OSX_PREFIX_LEN, name);
 720
 721         return hfsplus_getxattr(dentry, xattr_name, buffer, size);
 722 }
 723
 724 static int hfsplus_osx_setxattr(struct dentry *dentry, const char *name,
 725                 const void *buffer, size_t size, int flags, int type)
 726 {
 727         char xattr_name[HFSPLUS_ATTR_MAX_STRLEN +
 728                                 XATTR_MAC_OSX_PREFIX_LEN + 1] = {0};
 729         size_t len = strlen(name);
 730
 731         if (!strcmp(name, ""))
 732                 return -EINVAL;
 733
 734         if (len > HFSPLUS_ATTR_MAX_STRLEN)
 735                 return -EOPNOTSUPP;
 736
 737         strcpy(xattr_name, XATTR_MAC_OSX_PREFIX);
 738         strcpy(xattr_name + XATTR_MAC_OSX_PREFIX_LEN, name);
 739
 740         return hfsplus_setxattr(dentry, xattr_name, buffer, size, flags);
 741 }
 742
 743 static size_t hfsplus_osx_listxattr(struct dentry *dentry, char *list,
 744                 size_t list_size, const char *name, size_t name_len, int type)
 745 {
 746         /*
 747          * This method is not used.
 748          * It is used hfsplus_listxattr() instead of generic_listxattr().
 749          */
 750         return -EOPNOTSUPP;
 751 }
 752
 753 const struct xattr_handler hfsplus_xattr_osx_handler = {
 754         .prefix = XATTR_MAC_OSX_PREFIX,
 755         .list   = hfsplus_osx_listxattr,
 756         .get    = hfsplus_osx_getxattr,
 757         .set    = hfsplus_osx_setxattr,
 758 };