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->node_size >= PAGE_CACHE_SIZE) { 69 nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT); 70 spin_lock(&tree->hash_lock); 71 node = hfs_bnode_findhash(tree, nidx); 72 if (!node) 73 ; 74 else if (atomic_read(&node->refcnt)) 75 res = 0; 76 if (res && node) { 77 hfs_bnode_unhash(node); 78 hfs_bnode_free(node); 79 } 80 spin_unlock(&tree->hash_lock); 81 } else { 82 nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift); 83 i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift); 84 spin_lock(&tree->hash_lock); 85 do { 86 node = hfs_bnode_findhash(tree, nidx++); 87 if (!node) 88 continue; 89 if (atomic_read(&node->refcnt)) { 90 res = 0; 91 break; 92 } 93 hfs_bnode_unhash(node); 94 hfs_bnode_free(node); 95 } while (--i && nidx < tree->node_count); 96 spin_unlock(&tree->hash_lock); 97 } 98 return res ? try_to_free_buffers(page) : 0; 99 } 100 101 static ssize_t hfsplus_direct_IO(int rw, struct kiocb *iocb, 102 const struct iovec *iov, loff_t offset, unsigned long nr_segs) 103 { 104 struct file *file = iocb->ki_filp; 105 struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host; 106 107 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, 108 offset, nr_segs, hfsplus_get_block, NULL); 109 } 110 111 static int hfsplus_writepages(struct address_space *mapping, 112 struct writeback_control *wbc) 113 { 114 return mpage_writepages(mapping, wbc, hfsplus_get_block); 115 } 116 117 const struct address_space_operations hfsplus_btree_aops = { 118 .readpage = hfsplus_readpage, 119 .writepage = hfsplus_writepage, 120 .sync_page = block_sync_page, 121 .write_begin = hfsplus_write_begin, 122 .write_end = generic_write_end, 123 .bmap = hfsplus_bmap, 124 .releasepage = hfsplus_releasepage, 125 }; 126 127 const struct address_space_operations hfsplus_aops = { 128 .readpage = hfsplus_readpage, 129 .writepage = hfsplus_writepage, 130 .sync_page = block_sync_page, 131 .write_begin = hfsplus_write_begin, 132 .write_end = generic_write_end, 133 .bmap = hfsplus_bmap, 134 .direct_IO = hfsplus_direct_IO, 135 .writepages = hfsplus_writepages, 136 }; 137 138 struct dentry_operations hfsplus_dentry_operations = { 139 .d_hash = hfsplus_hash_dentry, 140 .d_compare = hfsplus_compare_dentry, 141 }; 142 143 static struct dentry *hfsplus_file_lookup(struct inode *dir, struct dentry *dentry, 144 struct nameidata *nd) 145 { 146 struct hfs_find_data fd; 147 struct super_block *sb = dir->i_sb; 148 struct inode *inode = NULL; 149 int err; 150 151 if (HFSPLUS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc")) 152 goto out; 153 154 inode = HFSPLUS_I(dir).rsrc_inode; 155 if (inode) 156 goto out; 157 158 inode = new_inode(sb); 159 if (!inode) 160 return ERR_PTR(-ENOMEM); 161 162 inode->i_ino = dir->i_ino; 163 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list); 164 init_MUTEX(&HFSPLUS_I(inode).extents_lock); 165 HFSPLUS_I(inode).flags = HFSPLUS_FLG_RSRC; 166 167 hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd); 168 err = hfsplus_find_cat(sb, dir->i_ino, &fd); 169 if (!err) 170 err = hfsplus_cat_read_inode(inode, &fd); 171 hfs_find_exit(&fd); 172 if (err) { 173 iput(inode); 174 return ERR_PTR(err); 175 } 176 HFSPLUS_I(inode).rsrc_inode = dir; 177 HFSPLUS_I(dir).rsrc_inode = inode; 178 igrab(dir); 179 hlist_add_head(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes); 180 mark_inode_dirty(inode); 181 out: 182 d_add(dentry, inode); 183 return NULL; 184 } 185 186 static void hfsplus_get_perms(struct inode *inode, struct hfsplus_perm *perms, int dir) 187 { 188 struct super_block *sb = inode->i_sb; 189 u16 mode; 190 191 mode = be16_to_cpu(perms->mode); 192 193 inode->i_uid = be32_to_cpu(perms->owner); 194 if (!inode->i_uid && !mode) 195 inode->i_uid = HFSPLUS_SB(sb).uid; 196 197 inode->i_gid = be32_to_cpu(perms->group); 198 if (!inode->i_gid && !mode) 199 inode->i_gid = HFSPLUS_SB(sb).gid; 200 201 if (dir) { 202 mode = mode ? (mode & S_IALLUGO) : 203 (S_IRWXUGO & ~(HFSPLUS_SB(sb).umask)); 204 mode |= S_IFDIR; 205 } else if (!mode) 206 mode = S_IFREG | ((S_IRUGO|S_IWUGO) & 207 ~(HFSPLUS_SB(sb).umask)); 208 inode->i_mode = mode; 209 210 HFSPLUS_I(inode).rootflags = perms->rootflags; 211 HFSPLUS_I(inode).userflags = perms->userflags; 212 if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE) 213 inode->i_flags |= S_IMMUTABLE; 214 else 215 inode->i_flags &= ~S_IMMUTABLE; 216 if (perms->rootflags & HFSPLUS_FLG_APPEND) 217 inode->i_flags |= S_APPEND; 218 else 219 inode->i_flags &= ~S_APPEND; 220 } 221 222 static void hfsplus_set_perms(struct inode *inode, struct hfsplus_perm *perms) 223 { 224 if (inode->i_flags & S_IMMUTABLE) 225 perms->rootflags |= HFSPLUS_FLG_IMMUTABLE; 226 else 227 perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE; 228 if (inode->i_flags & S_APPEND) 229 perms->rootflags |= HFSPLUS_FLG_APPEND; 230 else 231 perms->rootflags &= ~HFSPLUS_FLG_APPEND; 232 perms->userflags = HFSPLUS_I(inode).userflags; 233 perms->mode = cpu_to_be16(inode->i_mode); 234 perms->owner = cpu_to_be32(inode->i_uid); 235 perms->group = cpu_to_be32(inode->i_gid); 236 perms->dev = cpu_to_be32(HFSPLUS_I(inode).dev); 237 } 238 239 static int hfsplus_permission(struct inode *inode, int mask, struct nameidata *nd) 240 { 241 /* MAY_EXEC is also used for lookup, if no x bit is set allow lookup, 242 * open_exec has the same test, so it's still not executable, if a x bit 243 * is set fall back to standard permission check. 244 */ 245 if (S_ISREG(inode->i_mode) && mask & MAY_EXEC && !(inode->i_mode & 0111)) 246 return 0; 247 return generic_permission(inode, mask, NULL); 248 } 249 250 251 static int hfsplus_file_open(struct inode *inode, struct file *file) 252 { 253 if (HFSPLUS_IS_RSRC(inode)) 254 inode = HFSPLUS_I(inode).rsrc_inode; 255 if (atomic_read(&file->f_count) != 1) 256 return 0; 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_read(&file->f_count) != 0) 268 return 0; 269 if (atomic_dec_and_test(&HFSPLUS_I(inode).opencnt)) { 270 mutex_lock(&inode->i_mutex); 271 hfsplus_file_truncate(inode); 272 if (inode->i_flags & S_DEAD) { 273 hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL); 274 hfsplus_delete_inode(inode); 275 } 276 mutex_unlock(&inode->i_mutex); 277 } 278 return 0; 279 } 280 281 static const struct inode_operations hfsplus_file_inode_operations = { 282 .lookup = hfsplus_file_lookup, 283 .truncate = hfsplus_file_truncate, 284 .permission = hfsplus_permission, 285 .setxattr = hfsplus_setxattr, 286 .getxattr = hfsplus_getxattr, 287 .listxattr = hfsplus_listxattr, 288 }; 289 290 static const struct file_operations hfsplus_file_operations = { 291 .llseek = generic_file_llseek, 292 .read = do_sync_read, 293 .aio_read = generic_file_aio_read, 294 .write = do_sync_write, 295 .aio_write = generic_file_aio_write, 296 .mmap = generic_file_mmap, 297 .splice_read = generic_file_splice_read, 298 .fsync = file_fsync, 299 .open = hfsplus_file_open, 300 .release = hfsplus_file_release, 301 .ioctl = hfsplus_ioctl, 302 }; 303 304 struct inode *hfsplus_new_inode(struct super_block *sb, int mode) 305 { 306 struct inode *inode = new_inode(sb); 307 if (!inode) 308 return NULL; 309 310 inode->i_ino = HFSPLUS_SB(sb).next_cnid++; 311 inode->i_mode = mode; 312 inode->i_uid = current->fsuid; 313 inode->i_gid = current->fsgid; 314 inode->i_nlink = 1; 315 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; 316 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list); 317 init_MUTEX(&HFSPLUS_I(inode).extents_lock); 318 atomic_set(&HFSPLUS_I(inode).opencnt, 0); 319 HFSPLUS_I(inode).flags = 0; 320 memset(HFSPLUS_I(inode).first_extents, 0, sizeof(hfsplus_extent_rec)); 321 memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec)); 322 HFSPLUS_I(inode).alloc_blocks = 0; 323 HFSPLUS_I(inode).first_blocks = 0; 324 HFSPLUS_I(inode).cached_start = 0; 325 HFSPLUS_I(inode).cached_blocks = 0; 326 HFSPLUS_I(inode).phys_size = 0; 327 HFSPLUS_I(inode).fs_blocks = 0; 328 HFSPLUS_I(inode).rsrc_inode = NULL; 329 if (S_ISDIR(inode->i_mode)) { 330 inode->i_size = 2; 331 HFSPLUS_SB(sb).folder_count++; 332 inode->i_op = &hfsplus_dir_inode_operations; 333 inode->i_fop = &hfsplus_dir_operations; 334 } else if (S_ISREG(inode->i_mode)) { 335 HFSPLUS_SB(sb).file_count++; 336 inode->i_op = &hfsplus_file_inode_operations; 337 inode->i_fop = &hfsplus_file_operations; 338 inode->i_mapping->a_ops = &hfsplus_aops; 339 HFSPLUS_I(inode).clump_blocks = HFSPLUS_SB(sb).data_clump_blocks; 340 } else if (S_ISLNK(inode->i_mode)) { 341 HFSPLUS_SB(sb).file_count++; 342 inode->i_op = &page_symlink_inode_operations; 343 inode->i_mapping->a_ops = &hfsplus_aops; 344 HFSPLUS_I(inode).clump_blocks = 1; 345 } else 346 HFSPLUS_SB(sb).file_count++; 347 insert_inode_hash(inode); 348 mark_inode_dirty(inode); 349 sb->s_dirt = 1; 350 351 return inode; 352 } 353 354 void hfsplus_delete_inode(struct inode *inode) 355 { 356 struct super_block *sb = inode->i_sb; 357 358 if (S_ISDIR(inode->i_mode)) { 359 HFSPLUS_SB(sb).folder_count--; 360 sb->s_dirt = 1; 361 return; 362 } 363 HFSPLUS_SB(sb).file_count--; 364 if (S_ISREG(inode->i_mode)) { 365 if (!inode->i_nlink) { 366 inode->i_size = 0; 367 hfsplus_file_truncate(inode); 368 } 369 } else if (S_ISLNK(inode->i_mode)) { 370 inode->i_size = 0; 371 hfsplus_file_truncate(inode); 372 } 373 sb->s_dirt = 1; 374 } 375 376 void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork) 377 { 378 struct super_block *sb = inode->i_sb; 379 u32 count; 380 int i; 381 382 memcpy(&HFSPLUS_I(inode).first_extents, &fork->extents, 383 sizeof(hfsplus_extent_rec)); 384 for (count = 0, i = 0; i < 8; i++) 385 count += be32_to_cpu(fork->extents[i].block_count); 386 HFSPLUS_I(inode).first_blocks = count; 387 memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec)); 388 HFSPLUS_I(inode).cached_start = 0; 389 HFSPLUS_I(inode).cached_blocks = 0; 390 391 HFSPLUS_I(inode).alloc_blocks = be32_to_cpu(fork->total_blocks); 392 inode->i_size = HFSPLUS_I(inode).phys_size = be64_to_cpu(fork->total_size); 393 HFSPLUS_I(inode).fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 394 inode_set_bytes(inode, HFSPLUS_I(inode).fs_blocks << sb->s_blocksize_bits); 395 HFSPLUS_I(inode).clump_blocks = be32_to_cpu(fork->clump_size) >> HFSPLUS_SB(sb).alloc_blksz_shift; 396 if (!HFSPLUS_I(inode).clump_blocks) 397 HFSPLUS_I(inode).clump_blocks = HFSPLUS_IS_RSRC(inode) ? HFSPLUS_SB(sb).rsrc_clump_blocks : 398 HFSPLUS_SB(sb).data_clump_blocks; 399 } 400 401 void hfsplus_inode_write_fork(struct inode *inode, struct hfsplus_fork_raw *fork) 402 { 403 memcpy(&fork->extents, &HFSPLUS_I(inode).first_extents, 404 sizeof(hfsplus_extent_rec)); 405 fork->total_size = cpu_to_be64(inode->i_size); 406 fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode).alloc_blocks); 407 } 408 409 int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd) 410 { 411 hfsplus_cat_entry entry; 412 int res = 0; 413 u16 type; 414 415 type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset); 416 417 HFSPLUS_I(inode).dev = 0; 418 if (type == HFSPLUS_FOLDER) { 419 struct hfsplus_cat_folder *folder = &entry.folder; 420 421 if (fd->entrylength < sizeof(struct hfsplus_cat_folder)) 422 /* panic? */; 423 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, 424 sizeof(struct hfsplus_cat_folder)); 425 hfsplus_get_perms(inode, &folder->permissions, 1); 426 inode->i_nlink = 1; 427 inode->i_size = 2 + be32_to_cpu(folder->valence); 428 inode->i_atime = hfsp_mt2ut(folder->access_date); 429 inode->i_mtime = hfsp_mt2ut(folder->content_mod_date); 430 inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date); 431 HFSPLUS_I(inode).create_date = folder->create_date; 432 HFSPLUS_I(inode).fs_blocks = 0; 433 inode->i_op = &hfsplus_dir_inode_operations; 434 inode->i_fop = &hfsplus_dir_operations; 435 } else if (type == HFSPLUS_FILE) { 436 struct hfsplus_cat_file *file = &entry.file; 437 438 if (fd->entrylength < sizeof(struct hfsplus_cat_file)) 439 /* panic? */; 440 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, 441 sizeof(struct hfsplus_cat_file)); 442 443 hfsplus_inode_read_fork(inode, HFSPLUS_IS_DATA(inode) ? 444 &file->data_fork : &file->rsrc_fork); 445 hfsplus_get_perms(inode, &file->permissions, 0); 446 inode->i_nlink = 1; 447 if (S_ISREG(inode->i_mode)) { 448 if (file->permissions.dev) 449 inode->i_nlink = be32_to_cpu(file->permissions.dev); 450 inode->i_op = &hfsplus_file_inode_operations; 451 inode->i_fop = &hfsplus_file_operations; 452 inode->i_mapping->a_ops = &hfsplus_aops; 453 } else if (S_ISLNK(inode->i_mode)) { 454 inode->i_op = &page_symlink_inode_operations; 455 inode->i_mapping->a_ops = &hfsplus_aops; 456 } else { 457 init_special_inode(inode, inode->i_mode, 458 be32_to_cpu(file->permissions.dev)); 459 } 460 inode->i_atime = hfsp_mt2ut(file->access_date); 461 inode->i_mtime = hfsp_mt2ut(file->content_mod_date); 462 inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date); 463 HFSPLUS_I(inode).create_date = file->create_date; 464 } else { 465 printk(KERN_ERR "hfs: bad catalog entry used to create inode\n"); 466 res = -EIO; 467 } 468 return res; 469 } 470 471 int hfsplus_cat_write_inode(struct inode *inode) 472 { 473 struct inode *main_inode = inode; 474 struct hfs_find_data fd; 475 hfsplus_cat_entry entry; 476 477 if (HFSPLUS_IS_RSRC(inode)) 478 main_inode = HFSPLUS_I(inode).rsrc_inode; 479 480 if (!main_inode->i_nlink) 481 return 0; 482 483 if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb).cat_tree, &fd)) 484 /* panic? */ 485 return -EIO; 486 487 if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd)) 488 /* panic? */ 489 goto out; 490 491 if (S_ISDIR(main_inode->i_mode)) { 492 struct hfsplus_cat_folder *folder = &entry.folder; 493 494 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) 495 /* panic? */; 496 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 497 sizeof(struct hfsplus_cat_folder)); 498 /* simple node checks? */ 499 hfsplus_set_perms(inode, &folder->permissions); 500 folder->access_date = hfsp_ut2mt(inode->i_atime); 501 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime); 502 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); 503 folder->valence = cpu_to_be32(inode->i_size - 2); 504 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 505 sizeof(struct hfsplus_cat_folder)); 506 } else if (HFSPLUS_IS_RSRC(inode)) { 507 struct hfsplus_cat_file *file = &entry.file; 508 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 509 sizeof(struct hfsplus_cat_file)); 510 hfsplus_inode_write_fork(inode, &file->rsrc_fork); 511 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 512 sizeof(struct hfsplus_cat_file)); 513 } else { 514 struct hfsplus_cat_file *file = &entry.file; 515 516 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) 517 /* panic? */; 518 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 519 sizeof(struct hfsplus_cat_file)); 520 hfsplus_inode_write_fork(inode, &file->data_fork); 521 if (S_ISREG(inode->i_mode)) 522 HFSPLUS_I(inode).dev = inode->i_nlink; 523 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 524 HFSPLUS_I(inode).dev = kdev_t_to_nr(inode->i_rdev); 525 hfsplus_set_perms(inode, &file->permissions); 526 if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE) 527 file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED); 528 else 529 file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED); 530 file->access_date = hfsp_ut2mt(inode->i_atime); 531 file->content_mod_date = hfsp_ut2mt(inode->i_mtime); 532 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); 533 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 534 sizeof(struct hfsplus_cat_file)); 535 } 536 out: 537 hfs_find_exit(&fd); 538 return 0; 539 } 540