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 *pagep = NULL; 35 return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, 36 hfsplus_get_block, 37 &HFSPLUS_I(mapping->host).phys_size); 38 } 39 40 static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block) 41 { 42 return generic_block_bmap(mapping, block, hfsplus_get_block); 43 } 44 45 static int hfsplus_releasepage(struct page *page, gfp_t mask) 46 { 47 struct inode *inode = page->mapping->host; 48 struct super_block *sb = inode->i_sb; 49 struct hfs_btree *tree; 50 struct hfs_bnode *node; 51 u32 nidx; 52 int i, res = 1; 53 54 switch (inode->i_ino) { 55 case HFSPLUS_EXT_CNID: 56 tree = HFSPLUS_SB(sb).ext_tree; 57 break; 58 case HFSPLUS_CAT_CNID: 59 tree = HFSPLUS_SB(sb).cat_tree; 60 break; 61 case HFSPLUS_ATTR_CNID: 62 tree = HFSPLUS_SB(sb).attr_tree; 63 break; 64 default: 65 BUG(); 66 return 0; 67 } 68 if (!tree) 69 return 0; 70 if (tree->node_size >= PAGE_CACHE_SIZE) { 71 nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT); 72 spin_lock(&tree->hash_lock); 73 node = hfs_bnode_findhash(tree, nidx); 74 if (!node) 75 ; 76 else if (atomic_read(&node->refcnt)) 77 res = 0; 78 if (res && node) { 79 hfs_bnode_unhash(node); 80 hfs_bnode_free(node); 81 } 82 spin_unlock(&tree->hash_lock); 83 } else { 84 nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift); 85 i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift); 86 spin_lock(&tree->hash_lock); 87 do { 88 node = hfs_bnode_findhash(tree, nidx++); 89 if (!node) 90 continue; 91 if (atomic_read(&node->refcnt)) { 92 res = 0; 93 break; 94 } 95 hfs_bnode_unhash(node); 96 hfs_bnode_free(node); 97 } while (--i && nidx < tree->node_count); 98 spin_unlock(&tree->hash_lock); 99 } 100 return res ? try_to_free_buffers(page) : 0; 101 } 102 103 static ssize_t hfsplus_direct_IO(int rw, struct kiocb *iocb, 104 const struct iovec *iov, loff_t offset, unsigned long nr_segs) 105 { 106 struct file *file = iocb->ki_filp; 107 struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host; 108 109 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, 110 offset, nr_segs, hfsplus_get_block, NULL); 111 } 112 113 static int hfsplus_writepages(struct address_space *mapping, 114 struct writeback_control *wbc) 115 { 116 return mpage_writepages(mapping, wbc, hfsplus_get_block); 117 } 118 119 const struct address_space_operations hfsplus_btree_aops = { 120 .readpage = hfsplus_readpage, 121 .writepage = hfsplus_writepage, 122 .sync_page = block_sync_page, 123 .write_begin = hfsplus_write_begin, 124 .write_end = generic_write_end, 125 .bmap = hfsplus_bmap, 126 .releasepage = hfsplus_releasepage, 127 }; 128 129 const struct address_space_operations hfsplus_aops = { 130 .readpage = hfsplus_readpage, 131 .writepage = hfsplus_writepage, 132 .sync_page = block_sync_page, 133 .write_begin = hfsplus_write_begin, 134 .write_end = generic_write_end, 135 .bmap = hfsplus_bmap, 136 .direct_IO = hfsplus_direct_IO, 137 .writepages = hfsplus_writepages, 138 }; 139 140 struct dentry_operations hfsplus_dentry_operations = { 141 .d_hash = hfsplus_hash_dentry, 142 .d_compare = hfsplus_compare_dentry, 143 }; 144 145 static struct dentry *hfsplus_file_lookup(struct inode *dir, struct dentry *dentry, 146 struct nameidata *nd) 147 { 148 struct hfs_find_data fd; 149 struct super_block *sb = dir->i_sb; 150 struct inode *inode = NULL; 151 int err; 152 153 if (HFSPLUS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc")) 154 goto out; 155 156 inode = HFSPLUS_I(dir).rsrc_inode; 157 if (inode) 158 goto out; 159 160 inode = new_inode(sb); 161 if (!inode) 162 return ERR_PTR(-ENOMEM); 163 164 inode->i_ino = dir->i_ino; 165 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list); 166 mutex_init(&HFSPLUS_I(inode).extents_lock); 167 HFSPLUS_I(inode).flags = HFSPLUS_FLG_RSRC; 168 169 hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd); 170 err = hfsplus_find_cat(sb, dir->i_ino, &fd); 171 if (!err) 172 err = hfsplus_cat_read_inode(inode, &fd); 173 hfs_find_exit(&fd); 174 if (err) { 175 iput(inode); 176 return ERR_PTR(err); 177 } 178 HFSPLUS_I(inode).rsrc_inode = dir; 179 HFSPLUS_I(dir).rsrc_inode = inode; 180 igrab(dir); 181 hlist_add_head(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes); 182 mark_inode_dirty(inode); 183 out: 184 d_add(dentry, inode); 185 return NULL; 186 } 187 188 static void hfsplus_get_perms(struct inode *inode, struct hfsplus_perm *perms, int dir) 189 { 190 struct super_block *sb = inode->i_sb; 191 u16 mode; 192 193 mode = be16_to_cpu(perms->mode); 194 195 inode->i_uid = be32_to_cpu(perms->owner); 196 if (!inode->i_uid && !mode) 197 inode->i_uid = HFSPLUS_SB(sb).uid; 198 199 inode->i_gid = be32_to_cpu(perms->group); 200 if (!inode->i_gid && !mode) 201 inode->i_gid = HFSPLUS_SB(sb).gid; 202 203 if (dir) { 204 mode = mode ? (mode & S_IALLUGO) : 205 (S_IRWXUGO & ~(HFSPLUS_SB(sb).umask)); 206 mode |= S_IFDIR; 207 } else if (!mode) 208 mode = S_IFREG | ((S_IRUGO|S_IWUGO) & 209 ~(HFSPLUS_SB(sb).umask)); 210 inode->i_mode = mode; 211 212 HFSPLUS_I(inode).rootflags = perms->rootflags; 213 HFSPLUS_I(inode).userflags = perms->userflags; 214 if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE) 215 inode->i_flags |= S_IMMUTABLE; 216 else 217 inode->i_flags &= ~S_IMMUTABLE; 218 if (perms->rootflags & HFSPLUS_FLG_APPEND) 219 inode->i_flags |= S_APPEND; 220 else 221 inode->i_flags &= ~S_APPEND; 222 } 223 224 static void hfsplus_set_perms(struct inode *inode, struct hfsplus_perm *perms) 225 { 226 if (inode->i_flags & S_IMMUTABLE) 227 perms->rootflags |= HFSPLUS_FLG_IMMUTABLE; 228 else 229 perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE; 230 if (inode->i_flags & S_APPEND) 231 perms->rootflags |= HFSPLUS_FLG_APPEND; 232 else 233 perms->rootflags &= ~HFSPLUS_FLG_APPEND; 234 perms->userflags = HFSPLUS_I(inode).userflags; 235 perms->mode = cpu_to_be16(inode->i_mode); 236 perms->owner = cpu_to_be32(inode->i_uid); 237 perms->group = cpu_to_be32(inode->i_gid); 238 perms->dev = cpu_to_be32(HFSPLUS_I(inode).dev); 239 } 240 241 static int hfsplus_permission(struct inode *inode, int mask) 242 { 243 /* MAY_EXEC is also used for lookup, if no x bit is set allow lookup, 244 * open_exec has the same test, so it's still not executable, if a x bit 245 * is set fall back to standard permission check. 246 */ 247 if (S_ISREG(inode->i_mode) && mask & MAY_EXEC && !(inode->i_mode & 0111)) 248 return 0; 249 return generic_permission(inode, mask, NULL); 250 } 251 252 253 static int hfsplus_file_open(struct inode *inode, struct file *file) 254 { 255 if (HFSPLUS_IS_RSRC(inode)) 256 inode = HFSPLUS_I(inode).rsrc_inode; 257 atomic_inc(&HFSPLUS_I(inode).opencnt); 258 return 0; 259 } 260 261 static int hfsplus_file_release(struct inode *inode, struct file *file) 262 { 263 struct super_block *sb = inode->i_sb; 264 265 if (HFSPLUS_IS_RSRC(inode)) 266 inode = HFSPLUS_I(inode).rsrc_inode; 267 if (atomic_dec_and_test(&HFSPLUS_I(inode).opencnt)) { 268 mutex_lock(&inode->i_mutex); 269 hfsplus_file_truncate(inode); 270 if (inode->i_flags & S_DEAD) { 271 hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL); 272 hfsplus_delete_inode(inode); 273 } 274 mutex_unlock(&inode->i_mutex); 275 } 276 return 0; 277 } 278 279 static const struct inode_operations hfsplus_file_inode_operations = { 280 .lookup = hfsplus_file_lookup, 281 .truncate = hfsplus_file_truncate, 282 .permission = hfsplus_permission, 283 .setxattr = hfsplus_setxattr, 284 .getxattr = hfsplus_getxattr, 285 .listxattr = hfsplus_listxattr, 286 }; 287 288 static const struct file_operations hfsplus_file_operations = { 289 .llseek = generic_file_llseek, 290 .read = do_sync_read, 291 .aio_read = generic_file_aio_read, 292 .write = do_sync_write, 293 .aio_write = generic_file_aio_write, 294 .mmap = generic_file_mmap, 295 .splice_read = generic_file_splice_read, 296 .fsync = file_fsync, 297 .open = hfsplus_file_open, 298 .release = hfsplus_file_release, 299 .ioctl = hfsplus_ioctl, 300 }; 301 302 struct inode *hfsplus_new_inode(struct super_block *sb, int mode) 303 { 304 struct inode *inode = new_inode(sb); 305 if (!inode) 306 return NULL; 307 308 inode->i_ino = HFSPLUS_SB(sb).next_cnid++; 309 inode->i_mode = mode; 310 inode->i_uid = current->fsuid; 311 inode->i_gid = current->fsgid; 312 inode->i_nlink = 1; 313 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; 314 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list); 315 mutex_init(&HFSPLUS_I(inode).extents_lock); 316 atomic_set(&HFSPLUS_I(inode).opencnt, 0); 317 HFSPLUS_I(inode).flags = 0; 318 memset(HFSPLUS_I(inode).first_extents, 0, sizeof(hfsplus_extent_rec)); 319 memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec)); 320 HFSPLUS_I(inode).alloc_blocks = 0; 321 HFSPLUS_I(inode).first_blocks = 0; 322 HFSPLUS_I(inode).cached_start = 0; 323 HFSPLUS_I(inode).cached_blocks = 0; 324 HFSPLUS_I(inode).phys_size = 0; 325 HFSPLUS_I(inode).fs_blocks = 0; 326 HFSPLUS_I(inode).rsrc_inode = NULL; 327 if (S_ISDIR(inode->i_mode)) { 328 inode->i_size = 2; 329 HFSPLUS_SB(sb).folder_count++; 330 inode->i_op = &hfsplus_dir_inode_operations; 331 inode->i_fop = &hfsplus_dir_operations; 332 } else if (S_ISREG(inode->i_mode)) { 333 HFSPLUS_SB(sb).file_count++; 334 inode->i_op = &hfsplus_file_inode_operations; 335 inode->i_fop = &hfsplus_file_operations; 336 inode->i_mapping->a_ops = &hfsplus_aops; 337 HFSPLUS_I(inode).clump_blocks = HFSPLUS_SB(sb).data_clump_blocks; 338 } else if (S_ISLNK(inode->i_mode)) { 339 HFSPLUS_SB(sb).file_count++; 340 inode->i_op = &page_symlink_inode_operations; 341 inode->i_mapping->a_ops = &hfsplus_aops; 342 HFSPLUS_I(inode).clump_blocks = 1; 343 } else 344 HFSPLUS_SB(sb).file_count++; 345 insert_inode_hash(inode); 346 mark_inode_dirty(inode); 347 sb->s_dirt = 1; 348 349 return inode; 350 } 351 352 void hfsplus_delete_inode(struct inode *inode) 353 { 354 struct super_block *sb = inode->i_sb; 355 356 if (S_ISDIR(inode->i_mode)) { 357 HFSPLUS_SB(sb).folder_count--; 358 sb->s_dirt = 1; 359 return; 360 } 361 HFSPLUS_SB(sb).file_count--; 362 if (S_ISREG(inode->i_mode)) { 363 if (!inode->i_nlink) { 364 inode->i_size = 0; 365 hfsplus_file_truncate(inode); 366 } 367 } else if (S_ISLNK(inode->i_mode)) { 368 inode->i_size = 0; 369 hfsplus_file_truncate(inode); 370 } 371 sb->s_dirt = 1; 372 } 373 374 void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork) 375 { 376 struct super_block *sb = inode->i_sb; 377 u32 count; 378 int i; 379 380 memcpy(&HFSPLUS_I(inode).first_extents, &fork->extents, 381 sizeof(hfsplus_extent_rec)); 382 for (count = 0, i = 0; i < 8; i++) 383 count += be32_to_cpu(fork->extents[i].block_count); 384 HFSPLUS_I(inode).first_blocks = count; 385 memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec)); 386 HFSPLUS_I(inode).cached_start = 0; 387 HFSPLUS_I(inode).cached_blocks = 0; 388 389 HFSPLUS_I(inode).alloc_blocks = be32_to_cpu(fork->total_blocks); 390 inode->i_size = HFSPLUS_I(inode).phys_size = be64_to_cpu(fork->total_size); 391 HFSPLUS_I(inode).fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 392 inode_set_bytes(inode, HFSPLUS_I(inode).fs_blocks << sb->s_blocksize_bits); 393 HFSPLUS_I(inode).clump_blocks = be32_to_cpu(fork->clump_size) >> HFSPLUS_SB(sb).alloc_blksz_shift; 394 if (!HFSPLUS_I(inode).clump_blocks) 395 HFSPLUS_I(inode).clump_blocks = HFSPLUS_IS_RSRC(inode) ? HFSPLUS_SB(sb).rsrc_clump_blocks : 396 HFSPLUS_SB(sb).data_clump_blocks; 397 } 398 399 void hfsplus_inode_write_fork(struct inode *inode, struct hfsplus_fork_raw *fork) 400 { 401 memcpy(&fork->extents, &HFSPLUS_I(inode).first_extents, 402 sizeof(hfsplus_extent_rec)); 403 fork->total_size = cpu_to_be64(inode->i_size); 404 fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode).alloc_blocks); 405 } 406 407 int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd) 408 { 409 hfsplus_cat_entry entry; 410 int res = 0; 411 u16 type; 412 413 type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset); 414 415 HFSPLUS_I(inode).dev = 0; 416 if (type == HFSPLUS_FOLDER) { 417 struct hfsplus_cat_folder *folder = &entry.folder; 418 419 if (fd->entrylength < sizeof(struct hfsplus_cat_folder)) 420 /* panic? */; 421 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, 422 sizeof(struct hfsplus_cat_folder)); 423 hfsplus_get_perms(inode, &folder->permissions, 1); 424 inode->i_nlink = 1; 425 inode->i_size = 2 + be32_to_cpu(folder->valence); 426 inode->i_atime = hfsp_mt2ut(folder->access_date); 427 inode->i_mtime = hfsp_mt2ut(folder->content_mod_date); 428 inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date); 429 HFSPLUS_I(inode).create_date = folder->create_date; 430 HFSPLUS_I(inode).fs_blocks = 0; 431 inode->i_op = &hfsplus_dir_inode_operations; 432 inode->i_fop = &hfsplus_dir_operations; 433 } else if (type == HFSPLUS_FILE) { 434 struct hfsplus_cat_file *file = &entry.file; 435 436 if (fd->entrylength < sizeof(struct hfsplus_cat_file)) 437 /* panic? */; 438 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, 439 sizeof(struct hfsplus_cat_file)); 440 441 hfsplus_inode_read_fork(inode, HFSPLUS_IS_DATA(inode) ? 442 &file->data_fork : &file->rsrc_fork); 443 hfsplus_get_perms(inode, &file->permissions, 0); 444 inode->i_nlink = 1; 445 if (S_ISREG(inode->i_mode)) { 446 if (file->permissions.dev) 447 inode->i_nlink = be32_to_cpu(file->permissions.dev); 448 inode->i_op = &hfsplus_file_inode_operations; 449 inode->i_fop = &hfsplus_file_operations; 450 inode->i_mapping->a_ops = &hfsplus_aops; 451 } else if (S_ISLNK(inode->i_mode)) { 452 inode->i_op = &page_symlink_inode_operations; 453 inode->i_mapping->a_ops = &hfsplus_aops; 454 } else { 455 init_special_inode(inode, inode->i_mode, 456 be32_to_cpu(file->permissions.dev)); 457 } 458 inode->i_atime = hfsp_mt2ut(file->access_date); 459 inode->i_mtime = hfsp_mt2ut(file->content_mod_date); 460 inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date); 461 HFSPLUS_I(inode).create_date = file->create_date; 462 } else { 463 printk(KERN_ERR "hfs: bad catalog entry used to create inode\n"); 464 res = -EIO; 465 } 466 return res; 467 } 468 469 int hfsplus_cat_write_inode(struct inode *inode) 470 { 471 struct inode *main_inode = inode; 472 struct hfs_find_data fd; 473 hfsplus_cat_entry entry; 474 475 if (HFSPLUS_IS_RSRC(inode)) 476 main_inode = HFSPLUS_I(inode).rsrc_inode; 477 478 if (!main_inode->i_nlink) 479 return 0; 480 481 if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb).cat_tree, &fd)) 482 /* panic? */ 483 return -EIO; 484 485 if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd)) 486 /* panic? */ 487 goto out; 488 489 if (S_ISDIR(main_inode->i_mode)) { 490 struct hfsplus_cat_folder *folder = &entry.folder; 491 492 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) 493 /* panic? */; 494 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 495 sizeof(struct hfsplus_cat_folder)); 496 /* simple node checks? */ 497 hfsplus_set_perms(inode, &folder->permissions); 498 folder->access_date = hfsp_ut2mt(inode->i_atime); 499 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime); 500 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); 501 folder->valence = cpu_to_be32(inode->i_size - 2); 502 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 503 sizeof(struct hfsplus_cat_folder)); 504 } else if (HFSPLUS_IS_RSRC(inode)) { 505 struct hfsplus_cat_file *file = &entry.file; 506 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 507 sizeof(struct hfsplus_cat_file)); 508 hfsplus_inode_write_fork(inode, &file->rsrc_fork); 509 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 510 sizeof(struct hfsplus_cat_file)); 511 } else { 512 struct hfsplus_cat_file *file = &entry.file; 513 514 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) 515 /* panic? */; 516 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 517 sizeof(struct hfsplus_cat_file)); 518 hfsplus_inode_write_fork(inode, &file->data_fork); 519 if (S_ISREG(inode->i_mode)) 520 HFSPLUS_I(inode).dev = inode->i_nlink; 521 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 522 HFSPLUS_I(inode).dev = kdev_t_to_nr(inode->i_rdev); 523 hfsplus_set_perms(inode, &file->permissions); 524 if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE) 525 file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED); 526 else 527 file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED); 528 file->access_date = hfsp_ut2mt(inode->i_atime); 529 file->content_mod_date = hfsp_ut2mt(inode->i_mtime); 530 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); 531 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 532 sizeof(struct hfsplus_cat_file)); 533 } 534 out: 535 hfs_find_exit(&fd); 536 return 0; 537 } 538