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