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 init_MUTEX(&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, struct nameidata *nd) 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 if (atomic_read(&file->f_count) != 1) 258 return 0; 259 atomic_inc(&HFSPLUS_I(inode).opencnt); 260 return 0; 261 } 262 263 static int hfsplus_file_release(struct inode *inode, struct file *file) 264 { 265 struct super_block *sb = inode->i_sb; 266 267 if (HFSPLUS_IS_RSRC(inode)) 268 inode = HFSPLUS_I(inode).rsrc_inode; 269 if (atomic_read(&file->f_count) != 0) 270 return 0; 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, HFSPLUS_SB(sb).hidden_dir, NULL); 276 hfsplus_delete_inode(inode); 277 } 278 mutex_unlock(&inode->i_mutex); 279 } 280 return 0; 281 } 282 283 static const struct inode_operations hfsplus_file_inode_operations = { 284 .lookup = hfsplus_file_lookup, 285 .truncate = hfsplus_file_truncate, 286 .permission = hfsplus_permission, 287 .setxattr = hfsplus_setxattr, 288 .getxattr = hfsplus_getxattr, 289 .listxattr = hfsplus_listxattr, 290 }; 291 292 static const struct file_operations hfsplus_file_operations = { 293 .llseek = generic_file_llseek, 294 .read = do_sync_read, 295 .aio_read = generic_file_aio_read, 296 .write = do_sync_write, 297 .aio_write = generic_file_aio_write, 298 .mmap = generic_file_mmap, 299 .splice_read = generic_file_splice_read, 300 .fsync = file_fsync, 301 .open = hfsplus_file_open, 302 .release = hfsplus_file_release, 303 .ioctl = hfsplus_ioctl, 304 }; 305 306 struct inode *hfsplus_new_inode(struct super_block *sb, int mode) 307 { 308 struct inode *inode = new_inode(sb); 309 if (!inode) 310 return NULL; 311 312 inode->i_ino = HFSPLUS_SB(sb).next_cnid++; 313 inode->i_mode = mode; 314 inode->i_uid = current->fsuid; 315 inode->i_gid = current->fsgid; 316 inode->i_nlink = 1; 317 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; 318 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list); 319 init_MUTEX(&HFSPLUS_I(inode).extents_lock); 320 atomic_set(&HFSPLUS_I(inode).opencnt, 0); 321 HFSPLUS_I(inode).flags = 0; 322 memset(HFSPLUS_I(inode).first_extents, 0, sizeof(hfsplus_extent_rec)); 323 memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec)); 324 HFSPLUS_I(inode).alloc_blocks = 0; 325 HFSPLUS_I(inode).first_blocks = 0; 326 HFSPLUS_I(inode).cached_start = 0; 327 HFSPLUS_I(inode).cached_blocks = 0; 328 HFSPLUS_I(inode).phys_size = 0; 329 HFSPLUS_I(inode).fs_blocks = 0; 330 HFSPLUS_I(inode).rsrc_inode = NULL; 331 if (S_ISDIR(inode->i_mode)) { 332 inode->i_size = 2; 333 HFSPLUS_SB(sb).folder_count++; 334 inode->i_op = &hfsplus_dir_inode_operations; 335 inode->i_fop = &hfsplus_dir_operations; 336 } else if (S_ISREG(inode->i_mode)) { 337 HFSPLUS_SB(sb).file_count++; 338 inode->i_op = &hfsplus_file_inode_operations; 339 inode->i_fop = &hfsplus_file_operations; 340 inode->i_mapping->a_ops = &hfsplus_aops; 341 HFSPLUS_I(inode).clump_blocks = HFSPLUS_SB(sb).data_clump_blocks; 342 } else if (S_ISLNK(inode->i_mode)) { 343 HFSPLUS_SB(sb).file_count++; 344 inode->i_op = &page_symlink_inode_operations; 345 inode->i_mapping->a_ops = &hfsplus_aops; 346 HFSPLUS_I(inode).clump_blocks = 1; 347 } else 348 HFSPLUS_SB(sb).file_count++; 349 insert_inode_hash(inode); 350 mark_inode_dirty(inode); 351 sb->s_dirt = 1; 352 353 return inode; 354 } 355 356 void hfsplus_delete_inode(struct inode *inode) 357 { 358 struct super_block *sb = inode->i_sb; 359 360 if (S_ISDIR(inode->i_mode)) { 361 HFSPLUS_SB(sb).folder_count--; 362 sb->s_dirt = 1; 363 return; 364 } 365 HFSPLUS_SB(sb).file_count--; 366 if (S_ISREG(inode->i_mode)) { 367 if (!inode->i_nlink) { 368 inode->i_size = 0; 369 hfsplus_file_truncate(inode); 370 } 371 } else if (S_ISLNK(inode->i_mode)) { 372 inode->i_size = 0; 373 hfsplus_file_truncate(inode); 374 } 375 sb->s_dirt = 1; 376 } 377 378 void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork) 379 { 380 struct super_block *sb = inode->i_sb; 381 u32 count; 382 int i; 383 384 memcpy(&HFSPLUS_I(inode).first_extents, &fork->extents, 385 sizeof(hfsplus_extent_rec)); 386 for (count = 0, i = 0; i < 8; i++) 387 count += be32_to_cpu(fork->extents[i].block_count); 388 HFSPLUS_I(inode).first_blocks = count; 389 memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec)); 390 HFSPLUS_I(inode).cached_start = 0; 391 HFSPLUS_I(inode).cached_blocks = 0; 392 393 HFSPLUS_I(inode).alloc_blocks = be32_to_cpu(fork->total_blocks); 394 inode->i_size = HFSPLUS_I(inode).phys_size = be64_to_cpu(fork->total_size); 395 HFSPLUS_I(inode).fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 396 inode_set_bytes(inode, HFSPLUS_I(inode).fs_blocks << sb->s_blocksize_bits); 397 HFSPLUS_I(inode).clump_blocks = be32_to_cpu(fork->clump_size) >> HFSPLUS_SB(sb).alloc_blksz_shift; 398 if (!HFSPLUS_I(inode).clump_blocks) 399 HFSPLUS_I(inode).clump_blocks = HFSPLUS_IS_RSRC(inode) ? HFSPLUS_SB(sb).rsrc_clump_blocks : 400 HFSPLUS_SB(sb).data_clump_blocks; 401 } 402 403 void hfsplus_inode_write_fork(struct inode *inode, struct hfsplus_fork_raw *fork) 404 { 405 memcpy(&fork->extents, &HFSPLUS_I(inode).first_extents, 406 sizeof(hfsplus_extent_rec)); 407 fork->total_size = cpu_to_be64(inode->i_size); 408 fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode).alloc_blocks); 409 } 410 411 int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd) 412 { 413 hfsplus_cat_entry entry; 414 int res = 0; 415 u16 type; 416 417 type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset); 418 419 HFSPLUS_I(inode).dev = 0; 420 if (type == HFSPLUS_FOLDER) { 421 struct hfsplus_cat_folder *folder = &entry.folder; 422 423 if (fd->entrylength < sizeof(struct hfsplus_cat_folder)) 424 /* panic? */; 425 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, 426 sizeof(struct hfsplus_cat_folder)); 427 hfsplus_get_perms(inode, &folder->permissions, 1); 428 inode->i_nlink = 1; 429 inode->i_size = 2 + be32_to_cpu(folder->valence); 430 inode->i_atime = hfsp_mt2ut(folder->access_date); 431 inode->i_mtime = hfsp_mt2ut(folder->content_mod_date); 432 inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date); 433 HFSPLUS_I(inode).create_date = folder->create_date; 434 HFSPLUS_I(inode).fs_blocks = 0; 435 inode->i_op = &hfsplus_dir_inode_operations; 436 inode->i_fop = &hfsplus_dir_operations; 437 } else if (type == HFSPLUS_FILE) { 438 struct hfsplus_cat_file *file = &entry.file; 439 440 if (fd->entrylength < sizeof(struct hfsplus_cat_file)) 441 /* panic? */; 442 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, 443 sizeof(struct hfsplus_cat_file)); 444 445 hfsplus_inode_read_fork(inode, HFSPLUS_IS_DATA(inode) ? 446 &file->data_fork : &file->rsrc_fork); 447 hfsplus_get_perms(inode, &file->permissions, 0); 448 inode->i_nlink = 1; 449 if (S_ISREG(inode->i_mode)) { 450 if (file->permissions.dev) 451 inode->i_nlink = be32_to_cpu(file->permissions.dev); 452 inode->i_op = &hfsplus_file_inode_operations; 453 inode->i_fop = &hfsplus_file_operations; 454 inode->i_mapping->a_ops = &hfsplus_aops; 455 } else if (S_ISLNK(inode->i_mode)) { 456 inode->i_op = &page_symlink_inode_operations; 457 inode->i_mapping->a_ops = &hfsplus_aops; 458 } else { 459 init_special_inode(inode, inode->i_mode, 460 be32_to_cpu(file->permissions.dev)); 461 } 462 inode->i_atime = hfsp_mt2ut(file->access_date); 463 inode->i_mtime = hfsp_mt2ut(file->content_mod_date); 464 inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date); 465 HFSPLUS_I(inode).create_date = file->create_date; 466 } else { 467 printk(KERN_ERR "hfs: bad catalog entry used to create inode\n"); 468 res = -EIO; 469 } 470 return res; 471 } 472 473 int hfsplus_cat_write_inode(struct inode *inode) 474 { 475 struct inode *main_inode = inode; 476 struct hfs_find_data fd; 477 hfsplus_cat_entry entry; 478 479 if (HFSPLUS_IS_RSRC(inode)) 480 main_inode = HFSPLUS_I(inode).rsrc_inode; 481 482 if (!main_inode->i_nlink) 483 return 0; 484 485 if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb).cat_tree, &fd)) 486 /* panic? */ 487 return -EIO; 488 489 if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd)) 490 /* panic? */ 491 goto out; 492 493 if (S_ISDIR(main_inode->i_mode)) { 494 struct hfsplus_cat_folder *folder = &entry.folder; 495 496 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) 497 /* panic? */; 498 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 499 sizeof(struct hfsplus_cat_folder)); 500 /* simple node checks? */ 501 hfsplus_set_perms(inode, &folder->permissions); 502 folder->access_date = hfsp_ut2mt(inode->i_atime); 503 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime); 504 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); 505 folder->valence = cpu_to_be32(inode->i_size - 2); 506 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 507 sizeof(struct hfsplus_cat_folder)); 508 } else if (HFSPLUS_IS_RSRC(inode)) { 509 struct hfsplus_cat_file *file = &entry.file; 510 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 511 sizeof(struct hfsplus_cat_file)); 512 hfsplus_inode_write_fork(inode, &file->rsrc_fork); 513 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 514 sizeof(struct hfsplus_cat_file)); 515 } else { 516 struct hfsplus_cat_file *file = &entry.file; 517 518 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) 519 /* panic? */; 520 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 521 sizeof(struct hfsplus_cat_file)); 522 hfsplus_inode_write_fork(inode, &file->data_fork); 523 if (S_ISREG(inode->i_mode)) 524 HFSPLUS_I(inode).dev = inode->i_nlink; 525 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 526 HFSPLUS_I(inode).dev = kdev_t_to_nr(inode->i_rdev); 527 hfsplus_set_perms(inode, &file->permissions); 528 if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE) 529 file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED); 530 else 531 file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED); 532 file->access_date = hfsp_ut2mt(inode->i_atime); 533 file->content_mod_date = hfsp_ut2mt(inode->i_mtime); 534 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); 535 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 536 sizeof(struct hfsplus_cat_file)); 537 } 538 out: 539 hfs_find_exit(&fd); 540 return 0; 541 } 542