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_SIZE) { 91 nidx = page->index >> 92 (tree->node_size_shift - PAGE_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_SHIFT - tree->node_size_shift); 107 i = 1 << (PAGE_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 { 127 struct file *file = iocb->ki_filp; 128 struct address_space *mapping = file->f_mapping; 129 struct inode *inode = mapping->host; 130 size_t count = iov_iter_count(iter); 131 ssize_t ret; 132 133 ret = blockdev_direct_IO(iocb, inode, iter, hfsplus_get_block); 134 135 /* 136 * In case of error extending write may have instantiated a few 137 * blocks outside i_size. Trim these off again. 138 */ 139 if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) { 140 loff_t isize = i_size_read(inode); 141 loff_t end = iocb->ki_pos + count; 142 143 if (end > isize) 144 hfsplus_write_failed(mapping, end); 145 } 146 147 return ret; 148 } 149 150 static int hfsplus_writepages(struct address_space *mapping, 151 struct writeback_control *wbc) 152 { 153 return mpage_writepages(mapping, wbc, hfsplus_get_block); 154 } 155 156 const struct address_space_operations hfsplus_btree_aops = { 157 .readpage = hfsplus_readpage, 158 .writepage = hfsplus_writepage, 159 .write_begin = hfsplus_write_begin, 160 .write_end = generic_write_end, 161 .bmap = hfsplus_bmap, 162 .releasepage = hfsplus_releasepage, 163 }; 164 165 const struct address_space_operations hfsplus_aops = { 166 .readpage = hfsplus_readpage, 167 .writepage = hfsplus_writepage, 168 .write_begin = hfsplus_write_begin, 169 .write_end = generic_write_end, 170 .bmap = hfsplus_bmap, 171 .direct_IO = hfsplus_direct_IO, 172 .writepages = hfsplus_writepages, 173 }; 174 175 const struct dentry_operations hfsplus_dentry_operations = { 176 .d_hash = hfsplus_hash_dentry, 177 .d_compare = hfsplus_compare_dentry, 178 }; 179 180 static void hfsplus_get_perms(struct inode *inode, 181 struct hfsplus_perm *perms, int dir) 182 { 183 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); 184 u16 mode; 185 186 mode = be16_to_cpu(perms->mode); 187 188 i_uid_write(inode, be32_to_cpu(perms->owner)); 189 if (!i_uid_read(inode) && !mode) 190 inode->i_uid = sbi->uid; 191 192 i_gid_write(inode, be32_to_cpu(perms->group)); 193 if (!i_gid_read(inode) && !mode) 194 inode->i_gid = sbi->gid; 195 196 if (dir) { 197 mode = mode ? (mode & S_IALLUGO) : (S_IRWXUGO & ~(sbi->umask)); 198 mode |= S_IFDIR; 199 } else if (!mode) 200 mode = S_IFREG | ((S_IRUGO|S_IWUGO) & ~(sbi->umask)); 201 inode->i_mode = mode; 202 203 HFSPLUS_I(inode)->userflags = perms->userflags; 204 if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE) 205 inode->i_flags |= S_IMMUTABLE; 206 else 207 inode->i_flags &= ~S_IMMUTABLE; 208 if (perms->rootflags & HFSPLUS_FLG_APPEND) 209 inode->i_flags |= S_APPEND; 210 else 211 inode->i_flags &= ~S_APPEND; 212 } 213 214 static int hfsplus_file_open(struct inode *inode, struct file *file) 215 { 216 if (HFSPLUS_IS_RSRC(inode)) 217 inode = HFSPLUS_I(inode)->rsrc_inode; 218 if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS) 219 return -EOVERFLOW; 220 atomic_inc(&HFSPLUS_I(inode)->opencnt); 221 return 0; 222 } 223 224 static int hfsplus_file_release(struct inode *inode, struct file *file) 225 { 226 struct super_block *sb = inode->i_sb; 227 228 if (HFSPLUS_IS_RSRC(inode)) 229 inode = HFSPLUS_I(inode)->rsrc_inode; 230 if (atomic_dec_and_test(&HFSPLUS_I(inode)->opencnt)) { 231 inode_lock(inode); 232 hfsplus_file_truncate(inode); 233 if (inode->i_flags & S_DEAD) { 234 hfsplus_delete_cat(inode->i_ino, 235 HFSPLUS_SB(sb)->hidden_dir, NULL); 236 hfsplus_delete_inode(inode); 237 } 238 inode_unlock(inode); 239 } 240 return 0; 241 } 242 243 static int hfsplus_setattr(struct dentry *dentry, struct iattr *attr) 244 { 245 struct inode *inode = d_inode(dentry); 246 int error; 247 248 error = setattr_prepare(dentry, attr); 249 if (error) 250 return error; 251 252 if ((attr->ia_valid & ATTR_SIZE) && 253 attr->ia_size != i_size_read(inode)) { 254 inode_dio_wait(inode); 255 if (attr->ia_size > inode->i_size) { 256 error = generic_cont_expand_simple(inode, 257 attr->ia_size); 258 if (error) 259 return error; 260 } 261 truncate_setsize(inode, attr->ia_size); 262 hfsplus_file_truncate(inode); 263 } 264 265 setattr_copy(inode, attr); 266 mark_inode_dirty(inode); 267 268 if (attr->ia_valid & ATTR_MODE) { 269 error = posix_acl_chmod(inode, inode->i_mode); 270 if (unlikely(error)) 271 return error; 272 } 273 274 return 0; 275 } 276 277 int hfsplus_file_fsync(struct file *file, loff_t start, loff_t end, 278 int datasync) 279 { 280 struct inode *inode = file->f_mapping->host; 281 struct hfsplus_inode_info *hip = HFSPLUS_I(inode); 282 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); 283 int error = 0, error2; 284 285 error = filemap_write_and_wait_range(inode->i_mapping, start, end); 286 if (error) 287 return error; 288 inode_lock(inode); 289 290 /* 291 * Sync inode metadata into the catalog and extent trees. 292 */ 293 sync_inode_metadata(inode, 1); 294 295 /* 296 * And explicitly write out the btrees. 297 */ 298 if (test_and_clear_bit(HFSPLUS_I_CAT_DIRTY, &hip->flags)) 299 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping); 300 301 if (test_and_clear_bit(HFSPLUS_I_EXT_DIRTY, &hip->flags)) { 302 error2 = 303 filemap_write_and_wait(sbi->ext_tree->inode->i_mapping); 304 if (!error) 305 error = error2; 306 } 307 308 if (test_and_clear_bit(HFSPLUS_I_ATTR_DIRTY, &hip->flags)) { 309 if (sbi->attr_tree) { 310 error2 = 311 filemap_write_and_wait( 312 sbi->attr_tree->inode->i_mapping); 313 if (!error) 314 error = error2; 315 } else { 316 pr_err("sync non-existent attributes tree\n"); 317 } 318 } 319 320 if (test_and_clear_bit(HFSPLUS_I_ALLOC_DIRTY, &hip->flags)) { 321 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping); 322 if (!error) 323 error = error2; 324 } 325 326 if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags)) 327 blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL); 328 329 inode_unlock(inode); 330 331 return error; 332 } 333 334 static const struct inode_operations hfsplus_file_inode_operations = { 335 .setattr = hfsplus_setattr, 336 .listxattr = hfsplus_listxattr, 337 #ifdef CONFIG_HFSPLUS_FS_POSIX_ACL 338 .get_acl = hfsplus_get_posix_acl, 339 .set_acl = hfsplus_set_posix_acl, 340 #endif 341 }; 342 343 static const struct file_operations hfsplus_file_operations = { 344 .llseek = generic_file_llseek, 345 .read_iter = generic_file_read_iter, 346 .write_iter = generic_file_write_iter, 347 .mmap = generic_file_mmap, 348 .splice_read = generic_file_splice_read, 349 .fsync = hfsplus_file_fsync, 350 .open = hfsplus_file_open, 351 .release = hfsplus_file_release, 352 .unlocked_ioctl = hfsplus_ioctl, 353 }; 354 355 struct inode *hfsplus_new_inode(struct super_block *sb, umode_t mode) 356 { 357 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 358 struct inode *inode = new_inode(sb); 359 struct hfsplus_inode_info *hip; 360 361 if (!inode) 362 return NULL; 363 364 inode->i_ino = sbi->next_cnid++; 365 inode->i_mode = mode; 366 inode->i_uid = current_fsuid(); 367 inode->i_gid = current_fsgid(); 368 set_nlink(inode, 1); 369 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); 370 371 hip = HFSPLUS_I(inode); 372 INIT_LIST_HEAD(&hip->open_dir_list); 373 spin_lock_init(&hip->open_dir_lock); 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_nohighmem(inode); 404 inode->i_mapping->a_ops = &hfsplus_aops; 405 hip->clump_blocks = 1; 406 } else 407 sbi->file_count++; 408 insert_inode_hash(inode); 409 mark_inode_dirty(inode); 410 hfsplus_mark_mdb_dirty(sb); 411 412 return inode; 413 } 414 415 void hfsplus_delete_inode(struct inode *inode) 416 { 417 struct super_block *sb = inode->i_sb; 418 419 if (S_ISDIR(inode->i_mode)) { 420 HFSPLUS_SB(sb)->folder_count--; 421 hfsplus_mark_mdb_dirty(sb); 422 return; 423 } 424 HFSPLUS_SB(sb)->file_count--; 425 if (S_ISREG(inode->i_mode)) { 426 if (!inode->i_nlink) { 427 inode->i_size = 0; 428 hfsplus_file_truncate(inode); 429 } 430 } else if (S_ISLNK(inode->i_mode)) { 431 inode->i_size = 0; 432 hfsplus_file_truncate(inode); 433 } 434 hfsplus_mark_mdb_dirty(sb); 435 } 436 437 void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork) 438 { 439 struct super_block *sb = inode->i_sb; 440 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 441 struct hfsplus_inode_info *hip = HFSPLUS_I(inode); 442 u32 count; 443 int i; 444 445 memcpy(&hip->first_extents, &fork->extents, sizeof(hfsplus_extent_rec)); 446 for (count = 0, i = 0; i < 8; i++) 447 count += be32_to_cpu(fork->extents[i].block_count); 448 hip->first_blocks = count; 449 memset(hip->cached_extents, 0, sizeof(hfsplus_extent_rec)); 450 hip->cached_start = 0; 451 hip->cached_blocks = 0; 452 453 hip->alloc_blocks = be32_to_cpu(fork->total_blocks); 454 hip->phys_size = inode->i_size = be64_to_cpu(fork->total_size); 455 hip->fs_blocks = 456 (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 457 inode_set_bytes(inode, hip->fs_blocks << sb->s_blocksize_bits); 458 hip->clump_blocks = 459 be32_to_cpu(fork->clump_size) >> sbi->alloc_blksz_shift; 460 if (!hip->clump_blocks) { 461 hip->clump_blocks = HFSPLUS_IS_RSRC(inode) ? 462 sbi->rsrc_clump_blocks : 463 sbi->data_clump_blocks; 464 } 465 } 466 467 void hfsplus_inode_write_fork(struct inode *inode, 468 struct hfsplus_fork_raw *fork) 469 { 470 memcpy(&fork->extents, &HFSPLUS_I(inode)->first_extents, 471 sizeof(hfsplus_extent_rec)); 472 fork->total_size = cpu_to_be64(inode->i_size); 473 fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode)->alloc_blocks); 474 } 475 476 int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd) 477 { 478 hfsplus_cat_entry entry; 479 int res = 0; 480 u16 type; 481 482 type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset); 483 484 HFSPLUS_I(inode)->linkid = 0; 485 if (type == HFSPLUS_FOLDER) { 486 struct hfsplus_cat_folder *folder = &entry.folder; 487 488 if (fd->entrylength < sizeof(struct hfsplus_cat_folder)) 489 /* panic? */; 490 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, 491 sizeof(struct hfsplus_cat_folder)); 492 hfsplus_get_perms(inode, &folder->permissions, 1); 493 set_nlink(inode, 1); 494 inode->i_size = 2 + be32_to_cpu(folder->valence); 495 inode->i_atime = hfsp_mt2ut(folder->access_date); 496 inode->i_mtime = hfsp_mt2ut(folder->content_mod_date); 497 inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date); 498 HFSPLUS_I(inode)->create_date = folder->create_date; 499 HFSPLUS_I(inode)->fs_blocks = 0; 500 if (folder->flags & cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT)) { 501 HFSPLUS_I(inode)->subfolders = 502 be32_to_cpu(folder->subfolders); 503 } 504 inode->i_op = &hfsplus_dir_inode_operations; 505 inode->i_fop = &hfsplus_dir_operations; 506 } else if (type == HFSPLUS_FILE) { 507 struct hfsplus_cat_file *file = &entry.file; 508 509 if (fd->entrylength < sizeof(struct hfsplus_cat_file)) 510 /* panic? */; 511 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, 512 sizeof(struct hfsplus_cat_file)); 513 514 hfsplus_inode_read_fork(inode, HFSPLUS_IS_RSRC(inode) ? 515 &file->rsrc_fork : &file->data_fork); 516 hfsplus_get_perms(inode, &file->permissions, 0); 517 set_nlink(inode, 1); 518 if (S_ISREG(inode->i_mode)) { 519 if (file->permissions.dev) 520 set_nlink(inode, 521 be32_to_cpu(file->permissions.dev)); 522 inode->i_op = &hfsplus_file_inode_operations; 523 inode->i_fop = &hfsplus_file_operations; 524 inode->i_mapping->a_ops = &hfsplus_aops; 525 } else if (S_ISLNK(inode->i_mode)) { 526 inode->i_op = &page_symlink_inode_operations; 527 inode_nohighmem(inode); 528 inode->i_mapping->a_ops = &hfsplus_aops; 529 } else { 530 init_special_inode(inode, inode->i_mode, 531 be32_to_cpu(file->permissions.dev)); 532 } 533 inode->i_atime = hfsp_mt2ut(file->access_date); 534 inode->i_mtime = hfsp_mt2ut(file->content_mod_date); 535 inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date); 536 HFSPLUS_I(inode)->create_date = file->create_date; 537 } else { 538 pr_err("bad catalog entry used to create inode\n"); 539 res = -EIO; 540 } 541 return res; 542 } 543 544 int hfsplus_cat_write_inode(struct inode *inode) 545 { 546 struct inode *main_inode = inode; 547 struct hfs_find_data fd; 548 hfsplus_cat_entry entry; 549 550 if (HFSPLUS_IS_RSRC(inode)) 551 main_inode = HFSPLUS_I(inode)->rsrc_inode; 552 553 if (!main_inode->i_nlink) 554 return 0; 555 556 if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb)->cat_tree, &fd)) 557 /* panic? */ 558 return -EIO; 559 560 if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd)) 561 /* panic? */ 562 goto out; 563 564 if (S_ISDIR(main_inode->i_mode)) { 565 struct hfsplus_cat_folder *folder = &entry.folder; 566 567 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) 568 /* panic? */; 569 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 570 sizeof(struct hfsplus_cat_folder)); 571 /* simple node checks? */ 572 hfsplus_cat_set_perms(inode, &folder->permissions); 573 folder->access_date = hfsp_ut2mt(inode->i_atime); 574 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime); 575 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); 576 folder->valence = cpu_to_be32(inode->i_size - 2); 577 if (folder->flags & cpu_to_be16(HFSPLUS_HAS_FOLDER_COUNT)) { 578 folder->subfolders = 579 cpu_to_be32(HFSPLUS_I(inode)->subfolders); 580 } 581 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 582 sizeof(struct hfsplus_cat_folder)); 583 } else if (HFSPLUS_IS_RSRC(inode)) { 584 struct hfsplus_cat_file *file = &entry.file; 585 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 586 sizeof(struct hfsplus_cat_file)); 587 hfsplus_inode_write_fork(inode, &file->rsrc_fork); 588 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 589 sizeof(struct hfsplus_cat_file)); 590 } else { 591 struct hfsplus_cat_file *file = &entry.file; 592 593 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) 594 /* panic? */; 595 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 596 sizeof(struct hfsplus_cat_file)); 597 hfsplus_inode_write_fork(inode, &file->data_fork); 598 hfsplus_cat_set_perms(inode, &file->permissions); 599 if (HFSPLUS_FLG_IMMUTABLE & 600 (file->permissions.rootflags | 601 file->permissions.userflags)) 602 file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED); 603 else 604 file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED); 605 file->access_date = hfsp_ut2mt(inode->i_atime); 606 file->content_mod_date = hfsp_ut2mt(inode->i_mtime); 607 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); 608 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 609 sizeof(struct hfsplus_cat_file)); 610 } 611 612 set_bit(HFSPLUS_I_CAT_DIRTY, &HFSPLUS_I(inode)->flags); 613 out: 614 hfs_find_exit(&fd); 615 return 0; 616 } 617