1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/hfsplus/inode.c 4 * 5 * Copyright (C) 2001 6 * Brad Boyer (flar@allandria.com) 7 * (C) 2003 Ardis Technologies <roman@ardistech.com> 8 * 9 * Inode handling routines 10 */ 11 12 #include <linux/blkdev.h> 13 #include <linux/mm.h> 14 #include <linux/fs.h> 15 #include <linux/pagemap.h> 16 #include <linux/mpage.h> 17 #include <linux/sched.h> 18 #include <linux/cred.h> 19 #include <linux/uio.h> 20 21 #include "hfsplus_fs.h" 22 #include "hfsplus_raw.h" 23 #include "xattr.h" 24 25 static int hfsplus_readpage(struct file *file, struct page *page) 26 { 27 return block_read_full_page(page, hfsplus_get_block); 28 } 29 30 static int hfsplus_writepage(struct page *page, struct writeback_control *wbc) 31 { 32 return block_write_full_page(page, hfsplus_get_block, wbc); 33 } 34 35 static void hfsplus_write_failed(struct address_space *mapping, loff_t to) 36 { 37 struct inode *inode = mapping->host; 38 39 if (to > inode->i_size) { 40 truncate_pagecache(inode, inode->i_size); 41 hfsplus_file_truncate(inode); 42 } 43 } 44 45 static int hfsplus_write_begin(struct file *file, struct address_space *mapping, 46 loff_t pos, unsigned len, unsigned flags, 47 struct page **pagep, void **fsdata) 48 { 49 int ret; 50 51 *pagep = NULL; 52 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, 53 hfsplus_get_block, 54 &HFSPLUS_I(mapping->host)->phys_size); 55 if (unlikely(ret)) 56 hfsplus_write_failed(mapping, pos + len); 57 58 return ret; 59 } 60 61 static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block) 62 { 63 return generic_block_bmap(mapping, block, hfsplus_get_block); 64 } 65 66 static int hfsplus_releasepage(struct page *page, gfp_t mask) 67 { 68 struct inode *inode = page->mapping->host; 69 struct super_block *sb = inode->i_sb; 70 struct hfs_btree *tree; 71 struct hfs_bnode *node; 72 u32 nidx; 73 int i, res = 1; 74 75 switch (inode->i_ino) { 76 case HFSPLUS_EXT_CNID: 77 tree = HFSPLUS_SB(sb)->ext_tree; 78 break; 79 case HFSPLUS_CAT_CNID: 80 tree = HFSPLUS_SB(sb)->cat_tree; 81 break; 82 case HFSPLUS_ATTR_CNID: 83 tree = HFSPLUS_SB(sb)->attr_tree; 84 break; 85 default: 86 BUG(); 87 return 0; 88 } 89 if (!tree) 90 return 0; 91 if (tree->node_size >= PAGE_SIZE) { 92 nidx = page->index >> 93 (tree->node_size_shift - PAGE_SHIFT); 94 spin_lock(&tree->hash_lock); 95 node = hfs_bnode_findhash(tree, nidx); 96 if (!node) 97 ; 98 else if (atomic_read(&node->refcnt)) 99 res = 0; 100 if (res && node) { 101 hfs_bnode_unhash(node); 102 hfs_bnode_free(node); 103 } 104 spin_unlock(&tree->hash_lock); 105 } else { 106 nidx = page->index << 107 (PAGE_SHIFT - tree->node_size_shift); 108 i = 1 << (PAGE_SHIFT - tree->node_size_shift); 109 spin_lock(&tree->hash_lock); 110 do { 111 node = hfs_bnode_findhash(tree, nidx++); 112 if (!node) 113 continue; 114 if (atomic_read(&node->refcnt)) { 115 res = 0; 116 break; 117 } 118 hfs_bnode_unhash(node); 119 hfs_bnode_free(node); 120 } while (--i && nidx < tree->node_count); 121 spin_unlock(&tree->hash_lock); 122 } 123 return res ? try_to_free_buffers(page) : 0; 124 } 125 126 static ssize_t hfsplus_direct_IO(struct kiocb *iocb, struct iov_iter *iter) 127 { 128 struct file *file = iocb->ki_filp; 129 struct address_space *mapping = file->f_mapping; 130 struct inode *inode = mapping->host; 131 size_t count = iov_iter_count(iter); 132 ssize_t ret; 133 134 ret = blockdev_direct_IO(iocb, inode, iter, 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 = iocb->ki_pos + 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 inode_lock(inode); 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 inode_unlock(inode); 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 = setattr_prepare(dentry, 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 inode->i_mtime = inode->i_ctime = current_time(inode); 265 } 266 267 setattr_copy(inode, attr); 268 mark_inode_dirty(inode); 269 270 return 0; 271 } 272 273 int hfsplus_file_fsync(struct file *file, loff_t start, loff_t end, 274 int datasync) 275 { 276 struct inode *inode = file->f_mapping->host; 277 struct hfsplus_inode_info *hip = HFSPLUS_I(inode); 278 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); 279 int error = 0, error2; 280 281 error = file_write_and_wait_range(file, start, end); 282 if (error) 283 return error; 284 inode_lock(inode); 285 286 /* 287 * Sync inode metadata into the catalog and extent trees. 288 */ 289 sync_inode_metadata(inode, 1); 290 291 /* 292 * And explicitly write out the btrees. 293 */ 294 if (test_and_clear_bit(HFSPLUS_I_CAT_DIRTY, &hip->flags)) 295 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping); 296 297 if (test_and_clear_bit(HFSPLUS_I_EXT_DIRTY, &hip->flags)) { 298 error2 = 299 filemap_write_and_wait(sbi->ext_tree->inode->i_mapping); 300 if (!error) 301 error = error2; 302 } 303 304 if (test_and_clear_bit(HFSPLUS_I_ATTR_DIRTY, &hip->flags)) { 305 if (sbi->attr_tree) { 306 error2 = 307 filemap_write_and_wait( 308 sbi->attr_tree->inode->i_mapping); 309 if (!error) 310 error = error2; 311 } else { 312 pr_err("sync non-existent attributes tree\n"); 313 } 314 } 315 316 if (test_and_clear_bit(HFSPLUS_I_ALLOC_DIRTY, &hip->flags)) { 317 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping); 318 if (!error) 319 error = error2; 320 } 321 322 if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags)) 323 blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL); 324 325 inode_unlock(inode); 326 327 return error; 328 } 329 330 static const struct inode_operations hfsplus_file_inode_operations = { 331 .setattr = hfsplus_setattr, 332 .listxattr = hfsplus_listxattr, 333 }; 334 335 static const struct file_operations hfsplus_file_operations = { 336 .llseek = generic_file_llseek, 337 .read_iter = generic_file_read_iter, 338 .write_iter = generic_file_write_iter, 339 .mmap = generic_file_mmap, 340 .splice_read = generic_file_splice_read, 341 .fsync = hfsplus_file_fsync, 342 .open = hfsplus_file_open, 343 .release = hfsplus_file_release, 344 .unlocked_ioctl = hfsplus_ioctl, 345 }; 346 347 struct inode *hfsplus_new_inode(struct super_block *sb, struct inode *dir, 348 umode_t mode) 349 { 350 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 351 struct inode *inode = new_inode(sb); 352 struct hfsplus_inode_info *hip; 353 354 if (!inode) 355 return NULL; 356 357 inode->i_ino = sbi->next_cnid++; 358 inode_init_owner(inode, dir, mode); 359 set_nlink(inode, 1); 360 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); 361 362 hip = HFSPLUS_I(inode); 363 INIT_LIST_HEAD(&hip->open_dir_list); 364 spin_lock_init(&hip->open_dir_lock); 365 mutex_init(&hip->extents_lock); 366 atomic_set(&hip->opencnt, 0); 367 hip->extent_state = 0; 368 hip->flags = 0; 369 hip->userflags = 0; 370 hip->subfolders = 0; 371 memset(hip->first_extents, 0, sizeof(hfsplus_extent_rec)); 372 memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec)); 373 hip->alloc_blocks = 0; 374 hip->first_blocks = 0; 375 hip->cached_start = 0; 376 hip->cached_blocks = 0; 377 hip->phys_size = 0; 378 hip->fs_blocks = 0; 379 hip->rsrc_inode = NULL; 380 if (S_ISDIR(inode->i_mode)) { 381 inode->i_size = 2; 382 sbi->folder_count++; 383 inode->i_op = &hfsplus_dir_inode_operations; 384 inode->i_fop = &hfsplus_dir_operations; 385 } else if (S_ISREG(inode->i_mode)) { 386 sbi->file_count++; 387 inode->i_op = &hfsplus_file_inode_operations; 388 inode->i_fop = &hfsplus_file_operations; 389 inode->i_mapping->a_ops = &hfsplus_aops; 390 hip->clump_blocks = sbi->data_clump_blocks; 391 } else if (S_ISLNK(inode->i_mode)) { 392 sbi->file_count++; 393 inode->i_op = &page_symlink_inode_operations; 394 inode_nohighmem(inode); 395 inode->i_mapping->a_ops = &hfsplus_aops; 396 hip->clump_blocks = 1; 397 } else 398 sbi->file_count++; 399 insert_inode_hash(inode); 400 mark_inode_dirty(inode); 401 hfsplus_mark_mdb_dirty(sb); 402 403 return inode; 404 } 405 406 void hfsplus_delete_inode(struct inode *inode) 407 { 408 struct super_block *sb = inode->i_sb; 409 410 if (S_ISDIR(inode->i_mode)) { 411 HFSPLUS_SB(sb)->folder_count--; 412 hfsplus_mark_mdb_dirty(sb); 413 return; 414 } 415 HFSPLUS_SB(sb)->file_count--; 416 if (S_ISREG(inode->i_mode)) { 417 if (!inode->i_nlink) { 418 inode->i_size = 0; 419 hfsplus_file_truncate(inode); 420 } 421 } else if (S_ISLNK(inode->i_mode)) { 422 inode->i_size = 0; 423 hfsplus_file_truncate(inode); 424 } 425 hfsplus_mark_mdb_dirty(sb); 426 } 427 428 void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork) 429 { 430 struct super_block *sb = inode->i_sb; 431 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 432 struct hfsplus_inode_info *hip = HFSPLUS_I(inode); 433 u32 count; 434 int i; 435 436 memcpy(&hip->first_extents, &fork->extents, sizeof(hfsplus_extent_rec)); 437 for (count = 0, i = 0; i < 8; i++) 438 count += be32_to_cpu(fork->extents[i].block_count); 439 hip->first_blocks = count; 440 memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec)); 441 hip->cached_start = 0; 442 hip->cached_blocks = 0; 443 444 hip->alloc_blocks = be32_to_cpu(fork->total_blocks); 445 hip->phys_size = inode->i_size = be64_to_cpu(fork->total_size); 446 hip->fs_blocks = 447 (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 448 inode_set_bytes(inode, hip->fs_blocks << sb->s_blocksize_bits); 449 hip->clump_blocks = 450 be32_to_cpu(fork->clump_size) >> sbi->alloc_blksz_shift; 451 if (!hip->clump_blocks) { 452 hip->clump_blocks = HFSPLUS_IS_RSRC(inode) ? 453 sbi->rsrc_clump_blocks : 454 sbi->data_clump_blocks; 455 } 456 } 457 458 void hfsplus_inode_write_fork(struct inode *inode, 459 struct hfsplus_fork_raw *fork) 460 { 461 memcpy(&fork->extents, &HFSPLUS_I(inode)->first_extents, 462 sizeof(hfsplus_extent_rec)); 463 fork->total_size = cpu_to_be64(inode->i_size); 464 fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode)->alloc_blocks); 465 } 466 467 int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd) 468 { 469 hfsplus_cat_entry entry; 470 int res = 0; 471 u16 type; 472 473 type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset); 474 475 HFSPLUS_I(inode)->linkid = 0; 476 if (type == HFSPLUS_FOLDER) { 477 struct hfsplus_cat_folder *folder = &entry.folder; 478 479 if (fd->entrylength < sizeof(struct hfsplus_cat_folder)) 480 /* panic? */; 481 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, 482 sizeof(struct hfsplus_cat_folder)); 483 hfsplus_get_perms(inode, &folder->permissions, 1); 484 set_nlink(inode, 1); 485 inode->i_size = 2 + be32_to_cpu(folder->valence); 486 inode->i_atime = timespec_to_timespec64(hfsp_mt2ut(folder->access_date)); 487 inode->i_mtime = timespec_to_timespec64(hfsp_mt2ut(folder->content_mod_date)); 488 inode->i_ctime = timespec_to_timespec64(hfsp_mt2ut(folder->attribute_mod_date)); 489 HFSPLUS_I(inode)->create_date = folder->create_date; 490 HFSPLUS_I(inode)->fs_blocks = 0; 491 if (folder->flags & cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT)) { 492 HFSPLUS_I(inode)->subfolders = 493 be32_to_cpu(folder->subfolders); 494 } 495 inode->i_op = &hfsplus_dir_inode_operations; 496 inode->i_fop = &hfsplus_dir_operations; 497 } else if (type == HFSPLUS_FILE) { 498 struct hfsplus_cat_file *file = &entry.file; 499 500 if (fd->entrylength < sizeof(struct hfsplus_cat_file)) 501 /* panic? */; 502 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, 503 sizeof(struct hfsplus_cat_file)); 504 505 hfsplus_inode_read_fork(inode, HFSPLUS_IS_RSRC(inode) ? 506 &file->rsrc_fork : &file->data_fork); 507 hfsplus_get_perms(inode, &file->permissions, 0); 508 set_nlink(inode, 1); 509 if (S_ISREG(inode->i_mode)) { 510 if (file->permissions.dev) 511 set_nlink(inode, 512 be32_to_cpu(file->permissions.dev)); 513 inode->i_op = &hfsplus_file_inode_operations; 514 inode->i_fop = &hfsplus_file_operations; 515 inode->i_mapping->a_ops = &hfsplus_aops; 516 } else if (S_ISLNK(inode->i_mode)) { 517 inode->i_op = &page_symlink_inode_operations; 518 inode_nohighmem(inode); 519 inode->i_mapping->a_ops = &hfsplus_aops; 520 } else { 521 init_special_inode(inode, inode->i_mode, 522 be32_to_cpu(file->permissions.dev)); 523 } 524 inode->i_atime = timespec_to_timespec64(hfsp_mt2ut(file->access_date)); 525 inode->i_mtime = timespec_to_timespec64(hfsp_mt2ut(file->content_mod_date)); 526 inode->i_ctime = timespec_to_timespec64(hfsp_mt2ut(file->attribute_mod_date)); 527 HFSPLUS_I(inode)->create_date = file->create_date; 528 } else { 529 pr_err("bad catalog entry used to create inode\n"); 530 res = -EIO; 531 } 532 return res; 533 } 534 535 int hfsplus_cat_write_inode(struct inode *inode) 536 { 537 struct inode *main_inode = inode; 538 struct hfs_find_data fd; 539 hfsplus_cat_entry entry; 540 541 if (HFSPLUS_IS_RSRC(inode)) 542 main_inode = HFSPLUS_I(inode)->rsrc_inode; 543 544 if (!main_inode->i_nlink) 545 return 0; 546 547 if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb)->cat_tree, &fd)) 548 /* panic? */ 549 return -EIO; 550 551 if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd)) 552 /* panic? */ 553 goto out; 554 555 if (S_ISDIR(main_inode->i_mode)) { 556 struct hfsplus_cat_folder *folder = &entry.folder; 557 558 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) 559 /* panic? */; 560 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 561 sizeof(struct hfsplus_cat_folder)); 562 /* simple node checks? */ 563 hfsplus_cat_set_perms(inode, &folder->permissions); 564 folder->access_date = hfsp_ut2mt(inode->i_atime); 565 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime); 566 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); 567 folder->valence = cpu_to_be32(inode->i_size - 2); 568 if (folder->flags & cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT)) { 569 folder->subfolders = 570 cpu_to_be32(HFSPLUS_I(inode)->subfolders); 571 } 572 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 573 sizeof(struct hfsplus_cat_folder)); 574 } else if (HFSPLUS_IS_RSRC(inode)) { 575 struct hfsplus_cat_file *file = &entry.file; 576 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 577 sizeof(struct hfsplus_cat_file)); 578 hfsplus_inode_write_fork(inode, &file->rsrc_fork); 579 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 580 sizeof(struct hfsplus_cat_file)); 581 } else { 582 struct hfsplus_cat_file *file = &entry.file; 583 584 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) 585 /* panic? */; 586 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 587 sizeof(struct hfsplus_cat_file)); 588 hfsplus_inode_write_fork(inode, &file->data_fork); 589 hfsplus_cat_set_perms(inode, &file->permissions); 590 if (HFSPLUS_FLG_IMMUTABLE & 591 (file->permissions.rootflags | 592 file->permissions.userflags)) 593 file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED); 594 else 595 file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED); 596 file->access_date = hfsp_ut2mt(inode->i_atime); 597 file->content_mod_date = hfsp_ut2mt(inode->i_mtime); 598 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); 599 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 600 sizeof(struct hfsplus_cat_file)); 601 } 602 603 set_bit(HFSPLUS_I_CAT_DIRTY, &HFSPLUS_I(inode)->flags); 604 out: 605 hfs_find_exit(&fd); 606 return 0; 607 } 608