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/aio.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(int rw, struct kiocb *iocb, 126 struct iov_iter *iter, 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(rw, iocb, inode, iter, offset, 135 hfsplus_get_block); 136 137 /* 138 * In case of error extending write may have instantiated a few 139 * blocks outside i_size. Trim these off again. 140 */ 141 if (unlikely((rw & WRITE) && ret < 0)) { 142 loff_t isize = i_size_read(inode); 143 loff_t end = offset + count; 144 145 if (end > isize) 146 hfsplus_write_failed(mapping, end); 147 } 148 149 return ret; 150 } 151 152 static int hfsplus_writepages(struct address_space *mapping, 153 struct writeback_control *wbc) 154 { 155 return mpage_writepages(mapping, wbc, hfsplus_get_block); 156 } 157 158 const struct address_space_operations hfsplus_btree_aops = { 159 .readpage = hfsplus_readpage, 160 .writepage = hfsplus_writepage, 161 .write_begin = hfsplus_write_begin, 162 .write_end = generic_write_end, 163 .bmap = hfsplus_bmap, 164 .releasepage = hfsplus_releasepage, 165 }; 166 167 const struct address_space_operations hfsplus_aops = { 168 .readpage = hfsplus_readpage, 169 .writepage = hfsplus_writepage, 170 .write_begin = hfsplus_write_begin, 171 .write_end = generic_write_end, 172 .bmap = hfsplus_bmap, 173 .direct_IO = hfsplus_direct_IO, 174 .writepages = hfsplus_writepages, 175 }; 176 177 const struct dentry_operations hfsplus_dentry_operations = { 178 .d_hash = hfsplus_hash_dentry, 179 .d_compare = hfsplus_compare_dentry, 180 }; 181 182 static void hfsplus_get_perms(struct inode *inode, 183 struct hfsplus_perm *perms, int dir) 184 { 185 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); 186 u16 mode; 187 188 mode = be16_to_cpu(perms->mode); 189 190 i_uid_write(inode, be32_to_cpu(perms->owner)); 191 if (!i_uid_read(inode) && !mode) 192 inode->i_uid = sbi->uid; 193 194 i_gid_write(inode, be32_to_cpu(perms->group)); 195 if (!i_gid_read(inode) && !mode) 196 inode->i_gid = sbi->gid; 197 198 if (dir) { 199 mode = mode ? (mode & S_IALLUGO) : (S_IRWXUGO & ~(sbi->umask)); 200 mode |= S_IFDIR; 201 } else if (!mode) 202 mode = S_IFREG | ((S_IRUGO|S_IWUGO) & ~(sbi->umask)); 203 inode->i_mode = mode; 204 205 HFSPLUS_I(inode)->userflags = perms->userflags; 206 if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE) 207 inode->i_flags |= S_IMMUTABLE; 208 else 209 inode->i_flags &= ~S_IMMUTABLE; 210 if (perms->rootflags & HFSPLUS_FLG_APPEND) 211 inode->i_flags |= S_APPEND; 212 else 213 inode->i_flags &= ~S_APPEND; 214 } 215 216 static int hfsplus_file_open(struct inode *inode, struct file *file) 217 { 218 if (HFSPLUS_IS_RSRC(inode)) 219 inode = HFSPLUS_I(inode)->rsrc_inode; 220 if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS) 221 return -EOVERFLOW; 222 atomic_inc(&HFSPLUS_I(inode)->opencnt); 223 return 0; 224 } 225 226 static int hfsplus_file_release(struct inode *inode, struct file *file) 227 { 228 struct super_block *sb = inode->i_sb; 229 230 if (HFSPLUS_IS_RSRC(inode)) 231 inode = HFSPLUS_I(inode)->rsrc_inode; 232 if (atomic_dec_and_test(&HFSPLUS_I(inode)->opencnt)) { 233 mutex_lock(&inode->i_mutex); 234 hfsplus_file_truncate(inode); 235 if (inode->i_flags & S_DEAD) { 236 hfsplus_delete_cat(inode->i_ino, 237 HFSPLUS_SB(sb)->hidden_dir, NULL); 238 hfsplus_delete_inode(inode); 239 } 240 mutex_unlock(&inode->i_mutex); 241 } 242 return 0; 243 } 244 245 static int hfsplus_setattr(struct dentry *dentry, struct iattr *attr) 246 { 247 struct inode *inode = dentry->d_inode; 248 int error; 249 250 error = inode_change_ok(inode, attr); 251 if (error) 252 return error; 253 254 if ((attr->ia_valid & ATTR_SIZE) && 255 attr->ia_size != i_size_read(inode)) { 256 inode_dio_wait(inode); 257 truncate_setsize(inode, attr->ia_size); 258 hfsplus_file_truncate(inode); 259 } 260 261 setattr_copy(inode, attr); 262 mark_inode_dirty(inode); 263 264 if (attr->ia_valid & ATTR_MODE) { 265 error = posix_acl_chmod(inode, inode->i_mode); 266 if (unlikely(error)) 267 return error; 268 } 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 = filemap_write_and_wait_range(inode->i_mapping, start, end); 282 if (error) 283 return error; 284 mutex_lock(&inode->i_mutex); 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 mutex_unlock(&inode->i_mutex); 326 327 return error; 328 } 329 330 static const struct inode_operations hfsplus_file_inode_operations = { 331 .setattr = hfsplus_setattr, 332 .setxattr = generic_setxattr, 333 .getxattr = generic_getxattr, 334 .listxattr = hfsplus_listxattr, 335 .removexattr = generic_removexattr, 336 #ifdef CONFIG_HFSPLUS_FS_POSIX_ACL 337 .get_acl = hfsplus_get_posix_acl, 338 .set_acl = hfsplus_set_posix_acl, 339 #endif 340 }; 341 342 static const struct file_operations hfsplus_file_operations = { 343 .llseek = generic_file_llseek, 344 .read = new_sync_read, 345 .read_iter = generic_file_read_iter, 346 .write = new_sync_write, 347 .write_iter = generic_file_write_iter, 348 .mmap = generic_file_mmap, 349 .splice_read = generic_file_splice_read, 350 .fsync = hfsplus_file_fsync, 351 .open = hfsplus_file_open, 352 .release = hfsplus_file_release, 353 .unlocked_ioctl = hfsplus_ioctl, 354 }; 355 356 struct inode *hfsplus_new_inode(struct super_block *sb, umode_t mode) 357 { 358 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 359 struct inode *inode = new_inode(sb); 360 struct hfsplus_inode_info *hip; 361 362 if (!inode) 363 return NULL; 364 365 inode->i_ino = sbi->next_cnid++; 366 inode->i_mode = mode; 367 inode->i_uid = current_fsuid(); 368 inode->i_gid = current_fsgid(); 369 set_nlink(inode, 1); 370 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; 371 372 hip = HFSPLUS_I(inode); 373 INIT_LIST_HEAD(&hip->open_dir_list); 374 mutex_init(&hip->extents_lock); 375 atomic_set(&hip->opencnt, 0); 376 hip->extent_state = 0; 377 hip->flags = 0; 378 hip->userflags = 0; 379 hip->subfolders = 0; 380 memset(hip->first_extents, 0, sizeof(hfsplus_extent_rec)); 381 memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec)); 382 hip->alloc_blocks = 0; 383 hip->first_blocks = 0; 384 hip->cached_start = 0; 385 hip->cached_blocks = 0; 386 hip->phys_size = 0; 387 hip->fs_blocks = 0; 388 hip->rsrc_inode = NULL; 389 if (S_ISDIR(inode->i_mode)) { 390 inode->i_size = 2; 391 sbi->folder_count++; 392 inode->i_op = &hfsplus_dir_inode_operations; 393 inode->i_fop = &hfsplus_dir_operations; 394 } else if (S_ISREG(inode->i_mode)) { 395 sbi->file_count++; 396 inode->i_op = &hfsplus_file_inode_operations; 397 inode->i_fop = &hfsplus_file_operations; 398 inode->i_mapping->a_ops = &hfsplus_aops; 399 hip->clump_blocks = sbi->data_clump_blocks; 400 } else if (S_ISLNK(inode->i_mode)) { 401 sbi->file_count++; 402 inode->i_op = &page_symlink_inode_operations; 403 inode->i_mapping->a_ops = &hfsplus_aops; 404 hip->clump_blocks = 1; 405 } else 406 sbi->file_count++; 407 insert_inode_hash(inode); 408 mark_inode_dirty(inode); 409 hfsplus_mark_mdb_dirty(sb); 410 411 return inode; 412 } 413 414 void hfsplus_delete_inode(struct inode *inode) 415 { 416 struct super_block *sb = inode->i_sb; 417 418 if (S_ISDIR(inode->i_mode)) { 419 HFSPLUS_SB(sb)->folder_count--; 420 hfsplus_mark_mdb_dirty(sb); 421 return; 422 } 423 HFSPLUS_SB(sb)->file_count--; 424 if (S_ISREG(inode->i_mode)) { 425 if (!inode->i_nlink) { 426 inode->i_size = 0; 427 hfsplus_file_truncate(inode); 428 } 429 } else if (S_ISLNK(inode->i_mode)) { 430 inode->i_size = 0; 431 hfsplus_file_truncate(inode); 432 } 433 hfsplus_mark_mdb_dirty(sb); 434 } 435 436 void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork) 437 { 438 struct super_block *sb = inode->i_sb; 439 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 440 struct hfsplus_inode_info *hip = HFSPLUS_I(inode); 441 u32 count; 442 int i; 443 444 memcpy(&hip->first_extents, &fork->extents, sizeof(hfsplus_extent_rec)); 445 for (count = 0, i = 0; i < 8; i++) 446 count += be32_to_cpu(fork->extents[i].block_count); 447 hip->first_blocks = count; 448 memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec)); 449 hip->cached_start = 0; 450 hip->cached_blocks = 0; 451 452 hip->alloc_blocks = be32_to_cpu(fork->total_blocks); 453 hip->phys_size = inode->i_size = be64_to_cpu(fork->total_size); 454 hip->fs_blocks = 455 (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 456 inode_set_bytes(inode, hip->fs_blocks << sb->s_blocksize_bits); 457 hip->clump_blocks = 458 be32_to_cpu(fork->clump_size) >> sbi->alloc_blksz_shift; 459 if (!hip->clump_blocks) { 460 hip->clump_blocks = HFSPLUS_IS_RSRC(inode) ? 461 sbi->rsrc_clump_blocks : 462 sbi->data_clump_blocks; 463 } 464 } 465 466 void hfsplus_inode_write_fork(struct inode *inode, 467 struct hfsplus_fork_raw *fork) 468 { 469 memcpy(&fork->extents, &HFSPLUS_I(inode)->first_extents, 470 sizeof(hfsplus_extent_rec)); 471 fork->total_size = cpu_to_be64(inode->i_size); 472 fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode)->alloc_blocks); 473 } 474 475 int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd) 476 { 477 hfsplus_cat_entry entry; 478 int res = 0; 479 u16 type; 480 481 type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset); 482 483 HFSPLUS_I(inode)->linkid = 0; 484 if (type == HFSPLUS_FOLDER) { 485 struct hfsplus_cat_folder *folder = &entry.folder; 486 487 if (fd->entrylength < sizeof(struct hfsplus_cat_folder)) 488 /* panic? */; 489 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, 490 sizeof(struct hfsplus_cat_folder)); 491 hfsplus_get_perms(inode, &folder->permissions, 1); 492 set_nlink(inode, 1); 493 inode->i_size = 2 + be32_to_cpu(folder->valence); 494 inode->i_atime = hfsp_mt2ut(folder->access_date); 495 inode->i_mtime = hfsp_mt2ut(folder->content_mod_date); 496 inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date); 497 HFSPLUS_I(inode)->create_date = folder->create_date; 498 HFSPLUS_I(inode)->fs_blocks = 0; 499 if (folder->flags & cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT)) { 500 HFSPLUS_I(inode)->subfolders = 501 be32_to_cpu(folder->subfolders); 502 } 503 inode->i_op = &hfsplus_dir_inode_operations; 504 inode->i_fop = &hfsplus_dir_operations; 505 } else if (type == HFSPLUS_FILE) { 506 struct hfsplus_cat_file *file = &entry.file; 507 508 if (fd->entrylength < sizeof(struct hfsplus_cat_file)) 509 /* panic? */; 510 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, 511 sizeof(struct hfsplus_cat_file)); 512 513 hfsplus_inode_read_fork(inode, HFSPLUS_IS_RSRC(inode) ? 514 &file->rsrc_fork : &file->data_fork); 515 hfsplus_get_perms(inode, &file->permissions, 0); 516 set_nlink(inode, 1); 517 if (S_ISREG(inode->i_mode)) { 518 if (file->permissions.dev) 519 set_nlink(inode, 520 be32_to_cpu(file->permissions.dev)); 521 inode->i_op = &hfsplus_file_inode_operations; 522 inode->i_fop = &hfsplus_file_operations; 523 inode->i_mapping->a_ops = &hfsplus_aops; 524 } else if (S_ISLNK(inode->i_mode)) { 525 inode->i_op = &page_symlink_inode_operations; 526 inode->i_mapping->a_ops = &hfsplus_aops; 527 } else { 528 init_special_inode(inode, inode->i_mode, 529 be32_to_cpu(file->permissions.dev)); 530 } 531 inode->i_atime = hfsp_mt2ut(file->access_date); 532 inode->i_mtime = hfsp_mt2ut(file->content_mod_date); 533 inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date); 534 HFSPLUS_I(inode)->create_date = file->create_date; 535 } else { 536 pr_err("bad catalog entry used to create inode\n"); 537 res = -EIO; 538 } 539 return res; 540 } 541 542 int hfsplus_cat_write_inode(struct inode *inode) 543 { 544 struct inode *main_inode = inode; 545 struct hfs_find_data fd; 546 hfsplus_cat_entry entry; 547 548 if (HFSPLUS_IS_RSRC(inode)) 549 main_inode = HFSPLUS_I(inode)->rsrc_inode; 550 551 if (!main_inode->i_nlink) 552 return 0; 553 554 if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb)->cat_tree, &fd)) 555 /* panic? */ 556 return -EIO; 557 558 if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd)) 559 /* panic? */ 560 goto out; 561 562 if (S_ISDIR(main_inode->i_mode)) { 563 struct hfsplus_cat_folder *folder = &entry.folder; 564 565 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) 566 /* panic? */; 567 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 568 sizeof(struct hfsplus_cat_folder)); 569 /* simple node checks? */ 570 hfsplus_cat_set_perms(inode, &folder->permissions); 571 folder->access_date = hfsp_ut2mt(inode->i_atime); 572 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime); 573 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); 574 folder->valence = cpu_to_be32(inode->i_size - 2); 575 if (folder->flags & cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT)) { 576 folder->subfolders = 577 cpu_to_be32(HFSPLUS_I(inode)->subfolders); 578 } 579 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 580 sizeof(struct hfsplus_cat_folder)); 581 } else if (HFSPLUS_IS_RSRC(inode)) { 582 struct hfsplus_cat_file *file = &entry.file; 583 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 584 sizeof(struct hfsplus_cat_file)); 585 hfsplus_inode_write_fork(inode, &file->rsrc_fork); 586 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 587 sizeof(struct hfsplus_cat_file)); 588 } else { 589 struct hfsplus_cat_file *file = &entry.file; 590 591 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) 592 /* panic? */; 593 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 594 sizeof(struct hfsplus_cat_file)); 595 hfsplus_inode_write_fork(inode, &file->data_fork); 596 hfsplus_cat_set_perms(inode, &file->permissions); 597 if (HFSPLUS_FLG_IMMUTABLE & 598 (file->permissions.rootflags | 599 file->permissions.userflags)) 600 file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED); 601 else 602 file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED); 603 file->access_date = hfsp_ut2mt(inode->i_atime); 604 file->content_mod_date = hfsp_ut2mt(inode->i_mtime); 605 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); 606 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 607 sizeof(struct hfsplus_cat_file)); 608 } 609 610 set_bit(HFSPLUS_I_CAT_DIRTY, &HFSPLUS_I(inode)->flags); 611 out: 612 hfs_find_exit(&fd); 613 return 0; 614 } 615