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