1 /* 2 * linux/fs/hfsplus/inode.c 3 * 4 * Copyright (C) 2001 5 * Brad Boyer (flar@allandria.com) 6 * (C) 2003 Ardis Technologies <roman@ardistech.com> 7 * 8 * Inode handling routines 9 */ 10 11 #include <linux/blkdev.h> 12 #include <linux/mm.h> 13 #include <linux/fs.h> 14 #include <linux/pagemap.h> 15 #include <linux/mpage.h> 16 #include <linux/sched.h> 17 #include <linux/uio.h> 18 19 #include "hfsplus_fs.h" 20 #include "hfsplus_raw.h" 21 #include "xattr.h" 22 #include "acl.h" 23 24 static int hfsplus_readpage(struct file *file, struct page *page) 25 { 26 return block_read_full_page(page, hfsplus_get_block); 27 } 28 29 static int hfsplus_writepage(struct page *page, struct writeback_control *wbc) 30 { 31 return block_write_full_page(page, hfsplus_get_block, wbc); 32 } 33 34 static void hfsplus_write_failed(struct address_space *mapping, loff_t to) 35 { 36 struct inode *inode = mapping->host; 37 38 if (to > inode->i_size) { 39 truncate_pagecache(inode, inode->i_size); 40 hfsplus_file_truncate(inode); 41 } 42 } 43 44 static int hfsplus_write_begin(struct file *file, struct address_space *mapping, 45 loff_t pos, unsigned len, unsigned flags, 46 struct page **pagep, void **fsdata) 47 { 48 int ret; 49 50 *pagep = NULL; 51 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, 52 hfsplus_get_block, 53 &HFSPLUS_I(mapping->host)->phys_size); 54 if (unlikely(ret)) 55 hfsplus_write_failed(mapping, pos + len); 56 57 return ret; 58 } 59 60 static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block) 61 { 62 return generic_block_bmap(mapping, block, hfsplus_get_block); 63 } 64 65 static int hfsplus_releasepage(struct page *page, gfp_t mask) 66 { 67 struct inode *inode = page->mapping->host; 68 struct super_block *sb = inode->i_sb; 69 struct hfs_btree *tree; 70 struct hfs_bnode *node; 71 u32 nidx; 72 int i, res = 1; 73 74 switch (inode->i_ino) { 75 case HFSPLUS_EXT_CNID: 76 tree = HFSPLUS_SB(sb)->ext_tree; 77 break; 78 case HFSPLUS_CAT_CNID: 79 tree = HFSPLUS_SB(sb)->cat_tree; 80 break; 81 case HFSPLUS_ATTR_CNID: 82 tree = HFSPLUS_SB(sb)->attr_tree; 83 break; 84 default: 85 BUG(); 86 return 0; 87 } 88 if (!tree) 89 return 0; 90 if (tree->node_size >= PAGE_CACHE_SIZE) { 91 nidx = page->index >> 92 (tree->node_size_shift - PAGE_CACHE_SHIFT); 93 spin_lock(&tree->hash_lock); 94 node = hfs_bnode_findhash(tree, nidx); 95 if (!node) 96 ; 97 else if (atomic_read(&node->refcnt)) 98 res = 0; 99 if (res && node) { 100 hfs_bnode_unhash(node); 101 hfs_bnode_free(node); 102 } 103 spin_unlock(&tree->hash_lock); 104 } else { 105 nidx = page->index << 106 (PAGE_CACHE_SHIFT - tree->node_size_shift); 107 i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift); 108 spin_lock(&tree->hash_lock); 109 do { 110 node = hfs_bnode_findhash(tree, nidx++); 111 if (!node) 112 continue; 113 if (atomic_read(&node->refcnt)) { 114 res = 0; 115 break; 116 } 117 hfs_bnode_unhash(node); 118 hfs_bnode_free(node); 119 } while (--i && nidx < tree->node_count); 120 spin_unlock(&tree->hash_lock); 121 } 122 return res ? try_to_free_buffers(page) : 0; 123 } 124 125 static ssize_t hfsplus_direct_IO(struct kiocb *iocb, struct iov_iter *iter, 126 loff_t offset) 127 { 128 struct file *file = iocb->ki_filp; 129 struct address_space *mapping = file->f_mapping; 130 struct inode *inode = file_inode(file)->i_mapping->host; 131 size_t count = iov_iter_count(iter); 132 ssize_t ret; 133 134 ret = blockdev_direct_IO(iocb, inode, iter, offset, hfsplus_get_block); 135 136 /* 137 * In case of error extending write may have instantiated a few 138 * blocks outside i_size. Trim these off again. 139 */ 140 if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) { 141 loff_t isize = i_size_read(inode); 142 loff_t end = offset + count; 143 144 if (end > isize) 145 hfsplus_write_failed(mapping, end); 146 } 147 148 return ret; 149 } 150 151 static int hfsplus_writepages(struct address_space *mapping, 152 struct writeback_control *wbc) 153 { 154 return mpage_writepages(mapping, wbc, hfsplus_get_block); 155 } 156 157 const struct address_space_operations hfsplus_btree_aops = { 158 .readpage = hfsplus_readpage, 159 .writepage = hfsplus_writepage, 160 .write_begin = hfsplus_write_begin, 161 .write_end = generic_write_end, 162 .bmap = hfsplus_bmap, 163 .releasepage = hfsplus_releasepage, 164 }; 165 166 const struct address_space_operations hfsplus_aops = { 167 .readpage = hfsplus_readpage, 168 .writepage = hfsplus_writepage, 169 .write_begin = hfsplus_write_begin, 170 .write_end = generic_write_end, 171 .bmap = hfsplus_bmap, 172 .direct_IO = hfsplus_direct_IO, 173 .writepages = hfsplus_writepages, 174 }; 175 176 const struct dentry_operations hfsplus_dentry_operations = { 177 .d_hash = hfsplus_hash_dentry, 178 .d_compare = hfsplus_compare_dentry, 179 }; 180 181 static void hfsplus_get_perms(struct inode *inode, 182 struct hfsplus_perm *perms, int dir) 183 { 184 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); 185 u16 mode; 186 187 mode = be16_to_cpu(perms->mode); 188 189 i_uid_write(inode, be32_to_cpu(perms->owner)); 190 if (!i_uid_read(inode) && !mode) 191 inode->i_uid = sbi->uid; 192 193 i_gid_write(inode, be32_to_cpu(perms->group)); 194 if (!i_gid_read(inode) && !mode) 195 inode->i_gid = sbi->gid; 196 197 if (dir) { 198 mode = mode ? (mode & S_IALLUGO) : (S_IRWXUGO & ~(sbi->umask)); 199 mode |= S_IFDIR; 200 } else if (!mode) 201 mode = S_IFREG | ((S_IRUGO|S_IWUGO) & ~(sbi->umask)); 202 inode->i_mode = mode; 203 204 HFSPLUS_I(inode)->userflags = perms->userflags; 205 if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE) 206 inode->i_flags |= S_IMMUTABLE; 207 else 208 inode->i_flags &= ~S_IMMUTABLE; 209 if (perms->rootflags & HFSPLUS_FLG_APPEND) 210 inode->i_flags |= S_APPEND; 211 else 212 inode->i_flags &= ~S_APPEND; 213 } 214 215 static int hfsplus_file_open(struct inode *inode, struct file *file) 216 { 217 if (HFSPLUS_IS_RSRC(inode)) 218 inode = HFSPLUS_I(inode)->rsrc_inode; 219 if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS) 220 return -EOVERFLOW; 221 atomic_inc(&HFSPLUS_I(inode)->opencnt); 222 return 0; 223 } 224 225 static int hfsplus_file_release(struct inode *inode, struct file *file) 226 { 227 struct super_block *sb = inode->i_sb; 228 229 if (HFSPLUS_IS_RSRC(inode)) 230 inode = HFSPLUS_I(inode)->rsrc_inode; 231 if (atomic_dec_and_test(&HFSPLUS_I(inode)->opencnt)) { 232 mutex_lock(&inode->i_mutex); 233 hfsplus_file_truncate(inode); 234 if (inode->i_flags & S_DEAD) { 235 hfsplus_delete_cat(inode->i_ino, 236 HFSPLUS_SB(sb)->hidden_dir, NULL); 237 hfsplus_delete_inode(inode); 238 } 239 mutex_unlock(&inode->i_mutex); 240 } 241 return 0; 242 } 243 244 static int hfsplus_setattr(struct dentry *dentry, struct iattr *attr) 245 { 246 struct inode *inode = d_inode(dentry); 247 int error; 248 249 error = inode_change_ok(inode, attr); 250 if (error) 251 return error; 252 253 if ((attr->ia_valid & ATTR_SIZE) && 254 attr->ia_size != i_size_read(inode)) { 255 inode_dio_wait(inode); 256 if (attr->ia_size > inode->i_size) { 257 error = generic_cont_expand_simple(inode, 258 attr->ia_size); 259 if (error) 260 return error; 261 } 262 truncate_setsize(inode, attr->ia_size); 263 hfsplus_file_truncate(inode); 264 } 265 266 setattr_copy(inode, attr); 267 mark_inode_dirty(inode); 268 269 if (attr->ia_valid & ATTR_MODE) { 270 error = posix_acl_chmod(inode, inode->i_mode); 271 if (unlikely(error)) 272 return error; 273 } 274 275 return 0; 276 } 277 278 int hfsplus_file_fsync(struct file *file, loff_t start, loff_t end, 279 int datasync) 280 { 281 struct inode *inode = file->f_mapping->host; 282 struct hfsplus_inode_info *hip = HFSPLUS_I(inode); 283 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); 284 int error = 0, error2; 285 286 error = filemap_write_and_wait_range(inode->i_mapping, start, end); 287 if (error) 288 return error; 289 mutex_lock(&inode->i_mutex); 290 291 /* 292 * Sync inode metadata into the catalog and extent trees. 293 */ 294 sync_inode_metadata(inode, 1); 295 296 /* 297 * And explicitly write out the btrees. 298 */ 299 if (test_and_clear_bit(HFSPLUS_I_CAT_DIRTY, &hip->flags)) 300 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping); 301 302 if (test_and_clear_bit(HFSPLUS_I_EXT_DIRTY, &hip->flags)) { 303 error2 = 304 filemap_write_and_wait(sbi->ext_tree->inode->i_mapping); 305 if (!error) 306 error = error2; 307 } 308 309 if (test_and_clear_bit(HFSPLUS_I_ATTR_DIRTY, &hip->flags)) { 310 if (sbi->attr_tree) { 311 error2 = 312 filemap_write_and_wait( 313 sbi->attr_tree->inode->i_mapping); 314 if (!error) 315 error = error2; 316 } else { 317 pr_err("sync non-existent attributes tree\n"); 318 } 319 } 320 321 if (test_and_clear_bit(HFSPLUS_I_ALLOC_DIRTY, &hip->flags)) { 322 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping); 323 if (!error) 324 error = error2; 325 } 326 327 if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags)) 328 blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL); 329 330 mutex_unlock(&inode->i_mutex); 331 332 return error; 333 } 334 335 static const struct inode_operations hfsplus_file_inode_operations = { 336 .setattr = hfsplus_setattr, 337 .setxattr = generic_setxattr, 338 .getxattr = generic_getxattr, 339 .listxattr = hfsplus_listxattr, 340 .removexattr = generic_removexattr, 341 #ifdef CONFIG_HFSPLUS_FS_POSIX_ACL 342 .get_acl = hfsplus_get_posix_acl, 343 .set_acl = hfsplus_set_posix_acl, 344 #endif 345 }; 346 347 static const struct file_operations hfsplus_file_operations = { 348 .llseek = generic_file_llseek, 349 .read_iter = generic_file_read_iter, 350 .write_iter = generic_file_write_iter, 351 .mmap = generic_file_mmap, 352 .splice_read = generic_file_splice_read, 353 .fsync = hfsplus_file_fsync, 354 .open = hfsplus_file_open, 355 .release = hfsplus_file_release, 356 .unlocked_ioctl = hfsplus_ioctl, 357 }; 358 359 struct inode *hfsplus_new_inode(struct super_block *sb, umode_t mode) 360 { 361 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 362 struct inode *inode = new_inode(sb); 363 struct hfsplus_inode_info *hip; 364 365 if (!inode) 366 return NULL; 367 368 inode->i_ino = sbi->next_cnid++; 369 inode->i_mode = mode; 370 inode->i_uid = current_fsuid(); 371 inode->i_gid = current_fsgid(); 372 set_nlink(inode, 1); 373 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; 374 375 hip = HFSPLUS_I(inode); 376 INIT_LIST_HEAD(&hip->open_dir_list); 377 mutex_init(&hip->extents_lock); 378 atomic_set(&hip->opencnt, 0); 379 hip->extent_state = 0; 380 hip->flags = 0; 381 hip->userflags = 0; 382 hip->subfolders = 0; 383 memset(hip->first_extents, 0, sizeof(hfsplus_extent_rec)); 384 memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec)); 385 hip->alloc_blocks = 0; 386 hip->first_blocks = 0; 387 hip->cached_start = 0; 388 hip->cached_blocks = 0; 389 hip->phys_size = 0; 390 hip->fs_blocks = 0; 391 hip->rsrc_inode = NULL; 392 if (S_ISDIR(inode->i_mode)) { 393 inode->i_size = 2; 394 sbi->folder_count++; 395 inode->i_op = &hfsplus_dir_inode_operations; 396 inode->i_fop = &hfsplus_dir_operations; 397 } else if (S_ISREG(inode->i_mode)) { 398 sbi->file_count++; 399 inode->i_op = &hfsplus_file_inode_operations; 400 inode->i_fop = &hfsplus_file_operations; 401 inode->i_mapping->a_ops = &hfsplus_aops; 402 hip->clump_blocks = sbi->data_clump_blocks; 403 } else if (S_ISLNK(inode->i_mode)) { 404 sbi->file_count++; 405 inode->i_op = &page_symlink_inode_operations; 406 inode->i_mapping->a_ops = &hfsplus_aops; 407 hip->clump_blocks = 1; 408 } else 409 sbi->file_count++; 410 insert_inode_hash(inode); 411 mark_inode_dirty(inode); 412 hfsplus_mark_mdb_dirty(sb); 413 414 return inode; 415 } 416 417 void hfsplus_delete_inode(struct inode *inode) 418 { 419 struct super_block *sb = inode->i_sb; 420 421 if (S_ISDIR(inode->i_mode)) { 422 HFSPLUS_SB(sb)->folder_count--; 423 hfsplus_mark_mdb_dirty(sb); 424 return; 425 } 426 HFSPLUS_SB(sb)->file_count--; 427 if (S_ISREG(inode->i_mode)) { 428 if (!inode->i_nlink) { 429 inode->i_size = 0; 430 hfsplus_file_truncate(inode); 431 } 432 } else if (S_ISLNK(inode->i_mode)) { 433 inode->i_size = 0; 434 hfsplus_file_truncate(inode); 435 } 436 hfsplus_mark_mdb_dirty(sb); 437 } 438 439 void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork) 440 { 441 struct super_block *sb = inode->i_sb; 442 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 443 struct hfsplus_inode_info *hip = HFSPLUS_I(inode); 444 u32 count; 445 int i; 446 447 memcpy(&hip->first_extents, &fork->extents, sizeof(hfsplus_extent_rec)); 448 for (count = 0, i = 0; i < 8; i++) 449 count += be32_to_cpu(fork->extents[i].block_count); 450 hip->first_blocks = count; 451 memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec)); 452 hip->cached_start = 0; 453 hip->cached_blocks = 0; 454 455 hip->alloc_blocks = be32_to_cpu(fork->total_blocks); 456 hip->phys_size = inode->i_size = be64_to_cpu(fork->total_size); 457 hip->fs_blocks = 458 (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 459 inode_set_bytes(inode, hip->fs_blocks << sb->s_blocksize_bits); 460 hip->clump_blocks = 461 be32_to_cpu(fork->clump_size) >> sbi->alloc_blksz_shift; 462 if (!hip->clump_blocks) { 463 hip->clump_blocks = HFSPLUS_IS_RSRC(inode) ? 464 sbi->rsrc_clump_blocks : 465 sbi->data_clump_blocks; 466 } 467 } 468 469 void hfsplus_inode_write_fork(struct inode *inode, 470 struct hfsplus_fork_raw *fork) 471 { 472 memcpy(&fork->extents, &HFSPLUS_I(inode)->first_extents, 473 sizeof(hfsplus_extent_rec)); 474 fork->total_size = cpu_to_be64(inode->i_size); 475 fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode)->alloc_blocks); 476 } 477 478 int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd) 479 { 480 hfsplus_cat_entry entry; 481 int res = 0; 482 u16 type; 483 484 type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset); 485 486 HFSPLUS_I(inode)->linkid = 0; 487 if (type == HFSPLUS_FOLDER) { 488 struct hfsplus_cat_folder *folder = &entry.folder; 489 490 if (fd->entrylength < sizeof(struct hfsplus_cat_folder)) 491 /* panic? */; 492 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, 493 sizeof(struct hfsplus_cat_folder)); 494 hfsplus_get_perms(inode, &folder->permissions, 1); 495 set_nlink(inode, 1); 496 inode->i_size = 2 + be32_to_cpu(folder->valence); 497 inode->i_atime = hfsp_mt2ut(folder->access_date); 498 inode->i_mtime = hfsp_mt2ut(folder->content_mod_date); 499 inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date); 500 HFSPLUS_I(inode)->create_date = folder->create_date; 501 HFSPLUS_I(inode)->fs_blocks = 0; 502 if (folder->flags & cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT)) { 503 HFSPLUS_I(inode)->subfolders = 504 be32_to_cpu(folder->subfolders); 505 } 506 inode->i_op = &hfsplus_dir_inode_operations; 507 inode->i_fop = &hfsplus_dir_operations; 508 } else if (type == HFSPLUS_FILE) { 509 struct hfsplus_cat_file *file = &entry.file; 510 511 if (fd->entrylength < sizeof(struct hfsplus_cat_file)) 512 /* panic? */; 513 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, 514 sizeof(struct hfsplus_cat_file)); 515 516 hfsplus_inode_read_fork(inode, HFSPLUS_IS_RSRC(inode) ? 517 &file->rsrc_fork : &file->data_fork); 518 hfsplus_get_perms(inode, &file->permissions, 0); 519 set_nlink(inode, 1); 520 if (S_ISREG(inode->i_mode)) { 521 if (file->permissions.dev) 522 set_nlink(inode, 523 be32_to_cpu(file->permissions.dev)); 524 inode->i_op = &hfsplus_file_inode_operations; 525 inode->i_fop = &hfsplus_file_operations; 526 inode->i_mapping->a_ops = &hfsplus_aops; 527 } else if (S_ISLNK(inode->i_mode)) { 528 inode->i_op = &page_symlink_inode_operations; 529 inode->i_mapping->a_ops = &hfsplus_aops; 530 } else { 531 init_special_inode(inode, inode->i_mode, 532 be32_to_cpu(file->permissions.dev)); 533 } 534 inode->i_atime = hfsp_mt2ut(file->access_date); 535 inode->i_mtime = hfsp_mt2ut(file->content_mod_date); 536 inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date); 537 HFSPLUS_I(inode)->create_date = file->create_date; 538 } else { 539 pr_err("bad catalog entry used to create inode\n"); 540 res = -EIO; 541 } 542 return res; 543 } 544 545 int hfsplus_cat_write_inode(struct inode *inode) 546 { 547 struct inode *main_inode = inode; 548 struct hfs_find_data fd; 549 hfsplus_cat_entry entry; 550 551 if (HFSPLUS_IS_RSRC(inode)) 552 main_inode = HFSPLUS_I(inode)->rsrc_inode; 553 554 if (!main_inode->i_nlink) 555 return 0; 556 557 if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb)->cat_tree, &fd)) 558 /* panic? */ 559 return -EIO; 560 561 if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd)) 562 /* panic? */ 563 goto out; 564 565 if (S_ISDIR(main_inode->i_mode)) { 566 struct hfsplus_cat_folder *folder = &entry.folder; 567 568 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) 569 /* panic? */; 570 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 571 sizeof(struct hfsplus_cat_folder)); 572 /* simple node checks? */ 573 hfsplus_cat_set_perms(inode, &folder->permissions); 574 folder->access_date = hfsp_ut2mt(inode->i_atime); 575 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime); 576 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); 577 folder->valence = cpu_to_be32(inode->i_size - 2); 578 if (folder->flags & cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT)) { 579 folder->subfolders = 580 cpu_to_be32(HFSPLUS_I(inode)->subfolders); 581 } 582 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 583 sizeof(struct hfsplus_cat_folder)); 584 } else if (HFSPLUS_IS_RSRC(inode)) { 585 struct hfsplus_cat_file *file = &entry.file; 586 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 587 sizeof(struct hfsplus_cat_file)); 588 hfsplus_inode_write_fork(inode, &file->rsrc_fork); 589 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 590 sizeof(struct hfsplus_cat_file)); 591 } else { 592 struct hfsplus_cat_file *file = &entry.file; 593 594 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) 595 /* panic? */; 596 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 597 sizeof(struct hfsplus_cat_file)); 598 hfsplus_inode_write_fork(inode, &file->data_fork); 599 hfsplus_cat_set_perms(inode, &file->permissions); 600 if (HFSPLUS_FLG_IMMUTABLE & 601 (file->permissions.rootflags | 602 file->permissions.userflags)) 603 file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED); 604 else 605 file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED); 606 file->access_date = hfsp_ut2mt(inode->i_atime); 607 file->content_mod_date = hfsp_ut2mt(inode->i_mtime); 608 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); 609 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 610 sizeof(struct hfsplus_cat_file)); 611 } 612 613 set_bit(HFSPLUS_I_CAT_DIRTY, &HFSPLUS_I(inode)->flags); 614 out: 615 hfs_find_exit(&fd); 616 return 0; 617 } 618