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 16 #include "hfsplus_fs.h" 17 #include "hfsplus_raw.h" 18 19 static int hfsplus_readpage(struct file *file, struct page *page) 20 { 21 return block_read_full_page(page, hfsplus_get_block); 22 } 23 24 static int hfsplus_writepage(struct page *page, struct writeback_control *wbc) 25 { 26 return block_write_full_page(page, hfsplus_get_block, wbc); 27 } 28 29 static int hfsplus_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to) 30 { 31 return cont_prepare_write(page, from, to, hfsplus_get_block, 32 &HFSPLUS_I(page->mapping->host).phys_size); 33 } 34 35 static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block) 36 { 37 return generic_block_bmap(mapping, block, hfsplus_get_block); 38 } 39 40 static int hfsplus_releasepage(struct page *page, gfp_t mask) 41 { 42 struct inode *inode = page->mapping->host; 43 struct super_block *sb = inode->i_sb; 44 struct hfs_btree *tree; 45 struct hfs_bnode *node; 46 u32 nidx; 47 int i, res = 1; 48 49 switch (inode->i_ino) { 50 case HFSPLUS_EXT_CNID: 51 tree = HFSPLUS_SB(sb).ext_tree; 52 break; 53 case HFSPLUS_CAT_CNID: 54 tree = HFSPLUS_SB(sb).cat_tree; 55 break; 56 case HFSPLUS_ATTR_CNID: 57 tree = HFSPLUS_SB(sb).attr_tree; 58 break; 59 default: 60 BUG(); 61 return 0; 62 } 63 if (tree->node_size >= PAGE_CACHE_SIZE) { 64 nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT); 65 spin_lock(&tree->hash_lock); 66 node = hfs_bnode_findhash(tree, nidx); 67 if (!node) 68 ; 69 else if (atomic_read(&node->refcnt)) 70 res = 0; 71 if (res && node) { 72 hfs_bnode_unhash(node); 73 hfs_bnode_free(node); 74 } 75 spin_unlock(&tree->hash_lock); 76 } else { 77 nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift); 78 i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift); 79 spin_lock(&tree->hash_lock); 80 do { 81 node = hfs_bnode_findhash(tree, nidx++); 82 if (!node) 83 continue; 84 if (atomic_read(&node->refcnt)) { 85 res = 0; 86 break; 87 } 88 hfs_bnode_unhash(node); 89 hfs_bnode_free(node); 90 } while (--i && nidx < tree->node_count); 91 spin_unlock(&tree->hash_lock); 92 } 93 return res ? try_to_free_buffers(page) : 0; 94 } 95 96 static ssize_t hfsplus_direct_IO(int rw, struct kiocb *iocb, 97 const struct iovec *iov, loff_t offset, unsigned long nr_segs) 98 { 99 struct file *file = iocb->ki_filp; 100 struct inode *inode = file->f_path.dentry->d_inode->i_mapping->host; 101 102 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, 103 offset, nr_segs, hfsplus_get_block, NULL); 104 } 105 106 static int hfsplus_writepages(struct address_space *mapping, 107 struct writeback_control *wbc) 108 { 109 return mpage_writepages(mapping, wbc, hfsplus_get_block); 110 } 111 112 const struct address_space_operations hfsplus_btree_aops = { 113 .readpage = hfsplus_readpage, 114 .writepage = hfsplus_writepage, 115 .sync_page = block_sync_page, 116 .prepare_write = hfsplus_prepare_write, 117 .commit_write = generic_commit_write, 118 .bmap = hfsplus_bmap, 119 .releasepage = hfsplus_releasepage, 120 }; 121 122 const struct address_space_operations hfsplus_aops = { 123 .readpage = hfsplus_readpage, 124 .writepage = hfsplus_writepage, 125 .sync_page = block_sync_page, 126 .prepare_write = hfsplus_prepare_write, 127 .commit_write = generic_commit_write, 128 .bmap = hfsplus_bmap, 129 .direct_IO = hfsplus_direct_IO, 130 .writepages = hfsplus_writepages, 131 }; 132 133 static struct dentry *hfsplus_file_lookup(struct inode *dir, struct dentry *dentry, 134 struct nameidata *nd) 135 { 136 struct hfs_find_data fd; 137 struct super_block *sb = dir->i_sb; 138 struct inode *inode = NULL; 139 int err; 140 141 if (HFSPLUS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc")) 142 goto out; 143 144 inode = HFSPLUS_I(dir).rsrc_inode; 145 if (inode) 146 goto out; 147 148 inode = new_inode(sb); 149 if (!inode) 150 return ERR_PTR(-ENOMEM); 151 152 inode->i_ino = dir->i_ino; 153 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list); 154 init_MUTEX(&HFSPLUS_I(inode).extents_lock); 155 HFSPLUS_I(inode).flags = HFSPLUS_FLG_RSRC; 156 157 hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd); 158 err = hfsplus_find_cat(sb, dir->i_ino, &fd); 159 if (!err) 160 err = hfsplus_cat_read_inode(inode, &fd); 161 hfs_find_exit(&fd); 162 if (err) { 163 iput(inode); 164 return ERR_PTR(err); 165 } 166 HFSPLUS_I(inode).rsrc_inode = dir; 167 HFSPLUS_I(dir).rsrc_inode = inode; 168 igrab(dir); 169 hlist_add_head(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes); 170 mark_inode_dirty(inode); 171 out: 172 d_add(dentry, inode); 173 return NULL; 174 } 175 176 static void hfsplus_get_perms(struct inode *inode, struct hfsplus_perm *perms, int dir) 177 { 178 struct super_block *sb = inode->i_sb; 179 u16 mode; 180 181 mode = be16_to_cpu(perms->mode); 182 183 inode->i_uid = be32_to_cpu(perms->owner); 184 if (!inode->i_uid && !mode) 185 inode->i_uid = HFSPLUS_SB(sb).uid; 186 187 inode->i_gid = be32_to_cpu(perms->group); 188 if (!inode->i_gid && !mode) 189 inode->i_gid = HFSPLUS_SB(sb).gid; 190 191 if (dir) { 192 mode = mode ? (mode & S_IALLUGO) : 193 (S_IRWXUGO & ~(HFSPLUS_SB(sb).umask)); 194 mode |= S_IFDIR; 195 } else if (!mode) 196 mode = S_IFREG | ((S_IRUGO|S_IWUGO) & 197 ~(HFSPLUS_SB(sb).umask)); 198 inode->i_mode = mode; 199 200 HFSPLUS_I(inode).rootflags = perms->rootflags; 201 HFSPLUS_I(inode).userflags = perms->userflags; 202 if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE) 203 inode->i_flags |= S_IMMUTABLE; 204 else 205 inode->i_flags &= ~S_IMMUTABLE; 206 if (perms->rootflags & HFSPLUS_FLG_APPEND) 207 inode->i_flags |= S_APPEND; 208 else 209 inode->i_flags &= ~S_APPEND; 210 } 211 212 static void hfsplus_set_perms(struct inode *inode, struct hfsplus_perm *perms) 213 { 214 if (inode->i_flags & S_IMMUTABLE) 215 perms->rootflags |= HFSPLUS_FLG_IMMUTABLE; 216 else 217 perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE; 218 if (inode->i_flags & S_APPEND) 219 perms->rootflags |= HFSPLUS_FLG_APPEND; 220 else 221 perms->rootflags &= ~HFSPLUS_FLG_APPEND; 222 perms->userflags = HFSPLUS_I(inode).userflags; 223 perms->mode = cpu_to_be16(inode->i_mode); 224 perms->owner = cpu_to_be32(inode->i_uid); 225 perms->group = cpu_to_be32(inode->i_gid); 226 perms->dev = cpu_to_be32(HFSPLUS_I(inode).dev); 227 } 228 229 static int hfsplus_permission(struct inode *inode, int mask, struct nameidata *nd) 230 { 231 /* MAY_EXEC is also used for lookup, if no x bit is set allow lookup, 232 * open_exec has the same test, so it's still not executable, if a x bit 233 * is set fall back to standard permission check. 234 */ 235 if (S_ISREG(inode->i_mode) && mask & MAY_EXEC && !(inode->i_mode & 0111)) 236 return 0; 237 return generic_permission(inode, mask, NULL); 238 } 239 240 241 static int hfsplus_file_open(struct inode *inode, struct file *file) 242 { 243 if (HFSPLUS_IS_RSRC(inode)) 244 inode = HFSPLUS_I(inode).rsrc_inode; 245 if (atomic_read(&file->f_count) != 1) 246 return 0; 247 atomic_inc(&HFSPLUS_I(inode).opencnt); 248 return 0; 249 } 250 251 static int hfsplus_file_release(struct inode *inode, struct file *file) 252 { 253 struct super_block *sb = inode->i_sb; 254 255 if (HFSPLUS_IS_RSRC(inode)) 256 inode = HFSPLUS_I(inode).rsrc_inode; 257 if (atomic_read(&file->f_count) != 0) 258 return 0; 259 if (atomic_dec_and_test(&HFSPLUS_I(inode).opencnt)) { 260 mutex_lock(&inode->i_mutex); 261 hfsplus_file_truncate(inode); 262 if (inode->i_flags & S_DEAD) { 263 hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL); 264 hfsplus_delete_inode(inode); 265 } 266 mutex_unlock(&inode->i_mutex); 267 } 268 return 0; 269 } 270 271 extern const struct inode_operations hfsplus_dir_inode_operations; 272 extern struct file_operations hfsplus_dir_operations; 273 274 static const struct inode_operations hfsplus_file_inode_operations = { 275 .lookup = hfsplus_file_lookup, 276 .truncate = hfsplus_file_truncate, 277 .permission = hfsplus_permission, 278 .setxattr = hfsplus_setxattr, 279 .getxattr = hfsplus_getxattr, 280 .listxattr = hfsplus_listxattr, 281 }; 282 283 static const struct file_operations hfsplus_file_operations = { 284 .llseek = generic_file_llseek, 285 .read = do_sync_read, 286 .aio_read = generic_file_aio_read, 287 .write = do_sync_write, 288 .aio_write = generic_file_aio_write, 289 .mmap = generic_file_mmap, 290 .sendfile = generic_file_sendfile, 291 .fsync = file_fsync, 292 .open = hfsplus_file_open, 293 .release = hfsplus_file_release, 294 .ioctl = hfsplus_ioctl, 295 }; 296 297 struct inode *hfsplus_new_inode(struct super_block *sb, int mode) 298 { 299 struct inode *inode = new_inode(sb); 300 if (!inode) 301 return NULL; 302 303 inode->i_ino = HFSPLUS_SB(sb).next_cnid++; 304 inode->i_mode = mode; 305 inode->i_uid = current->fsuid; 306 inode->i_gid = current->fsgid; 307 inode->i_nlink = 1; 308 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; 309 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list); 310 init_MUTEX(&HFSPLUS_I(inode).extents_lock); 311 atomic_set(&HFSPLUS_I(inode).opencnt, 0); 312 HFSPLUS_I(inode).flags = 0; 313 memset(HFSPLUS_I(inode).first_extents, 0, sizeof(hfsplus_extent_rec)); 314 memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec)); 315 HFSPLUS_I(inode).alloc_blocks = 0; 316 HFSPLUS_I(inode).first_blocks = 0; 317 HFSPLUS_I(inode).cached_start = 0; 318 HFSPLUS_I(inode).cached_blocks = 0; 319 HFSPLUS_I(inode).phys_size = 0; 320 HFSPLUS_I(inode).fs_blocks = 0; 321 HFSPLUS_I(inode).rsrc_inode = NULL; 322 if (S_ISDIR(inode->i_mode)) { 323 inode->i_size = 2; 324 HFSPLUS_SB(sb).folder_count++; 325 inode->i_op = &hfsplus_dir_inode_operations; 326 inode->i_fop = &hfsplus_dir_operations; 327 } else if (S_ISREG(inode->i_mode)) { 328 HFSPLUS_SB(sb).file_count++; 329 inode->i_op = &hfsplus_file_inode_operations; 330 inode->i_fop = &hfsplus_file_operations; 331 inode->i_mapping->a_ops = &hfsplus_aops; 332 HFSPLUS_I(inode).clump_blocks = HFSPLUS_SB(sb).data_clump_blocks; 333 } else if (S_ISLNK(inode->i_mode)) { 334 HFSPLUS_SB(sb).file_count++; 335 inode->i_op = &page_symlink_inode_operations; 336 inode->i_mapping->a_ops = &hfsplus_aops; 337 HFSPLUS_I(inode).clump_blocks = 1; 338 } else 339 HFSPLUS_SB(sb).file_count++; 340 insert_inode_hash(inode); 341 mark_inode_dirty(inode); 342 sb->s_dirt = 1; 343 344 return inode; 345 } 346 347 void hfsplus_delete_inode(struct inode *inode) 348 { 349 struct super_block *sb = inode->i_sb; 350 351 if (S_ISDIR(inode->i_mode)) { 352 HFSPLUS_SB(sb).folder_count--; 353 sb->s_dirt = 1; 354 return; 355 } 356 HFSPLUS_SB(sb).file_count--; 357 if (S_ISREG(inode->i_mode)) { 358 if (!inode->i_nlink) { 359 inode->i_size = 0; 360 hfsplus_file_truncate(inode); 361 } 362 } else if (S_ISLNK(inode->i_mode)) { 363 inode->i_size = 0; 364 hfsplus_file_truncate(inode); 365 } 366 sb->s_dirt = 1; 367 } 368 369 void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork) 370 { 371 struct super_block *sb = inode->i_sb; 372 u32 count; 373 int i; 374 375 memcpy(&HFSPLUS_I(inode).first_extents, &fork->extents, 376 sizeof(hfsplus_extent_rec)); 377 for (count = 0, i = 0; i < 8; i++) 378 count += be32_to_cpu(fork->extents[i].block_count); 379 HFSPLUS_I(inode).first_blocks = count; 380 memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec)); 381 HFSPLUS_I(inode).cached_start = 0; 382 HFSPLUS_I(inode).cached_blocks = 0; 383 384 HFSPLUS_I(inode).alloc_blocks = be32_to_cpu(fork->total_blocks); 385 inode->i_size = HFSPLUS_I(inode).phys_size = be64_to_cpu(fork->total_size); 386 HFSPLUS_I(inode).fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 387 inode_set_bytes(inode, HFSPLUS_I(inode).fs_blocks << sb->s_blocksize_bits); 388 HFSPLUS_I(inode).clump_blocks = be32_to_cpu(fork->clump_size) >> HFSPLUS_SB(sb).alloc_blksz_shift; 389 if (!HFSPLUS_I(inode).clump_blocks) 390 HFSPLUS_I(inode).clump_blocks = HFSPLUS_IS_RSRC(inode) ? HFSPLUS_SB(sb).rsrc_clump_blocks : 391 HFSPLUS_SB(sb).data_clump_blocks; 392 } 393 394 void hfsplus_inode_write_fork(struct inode *inode, struct hfsplus_fork_raw *fork) 395 { 396 memcpy(&fork->extents, &HFSPLUS_I(inode).first_extents, 397 sizeof(hfsplus_extent_rec)); 398 fork->total_size = cpu_to_be64(inode->i_size); 399 fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode).alloc_blocks); 400 } 401 402 int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd) 403 { 404 hfsplus_cat_entry entry; 405 int res = 0; 406 u16 type; 407 408 type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset); 409 410 HFSPLUS_I(inode).dev = 0; 411 if (type == HFSPLUS_FOLDER) { 412 struct hfsplus_cat_folder *folder = &entry.folder; 413 414 if (fd->entrylength < sizeof(struct hfsplus_cat_folder)) 415 /* panic? */; 416 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, 417 sizeof(struct hfsplus_cat_folder)); 418 hfsplus_get_perms(inode, &folder->permissions, 1); 419 inode->i_nlink = 1; 420 inode->i_size = 2 + be32_to_cpu(folder->valence); 421 inode->i_atime = hfsp_mt2ut(folder->access_date); 422 inode->i_mtime = hfsp_mt2ut(folder->content_mod_date); 423 inode->i_ctime = hfsp_mt2ut(folder->attribute_mod_date); 424 HFSPLUS_I(inode).create_date = folder->create_date; 425 HFSPLUS_I(inode).fs_blocks = 0; 426 inode->i_op = &hfsplus_dir_inode_operations; 427 inode->i_fop = &hfsplus_dir_operations; 428 } else if (type == HFSPLUS_FILE) { 429 struct hfsplus_cat_file *file = &entry.file; 430 431 if (fd->entrylength < sizeof(struct hfsplus_cat_file)) 432 /* panic? */; 433 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, 434 sizeof(struct hfsplus_cat_file)); 435 436 hfsplus_inode_read_fork(inode, HFSPLUS_IS_DATA(inode) ? 437 &file->data_fork : &file->rsrc_fork); 438 hfsplus_get_perms(inode, &file->permissions, 0); 439 inode->i_nlink = 1; 440 if (S_ISREG(inode->i_mode)) { 441 if (file->permissions.dev) 442 inode->i_nlink = be32_to_cpu(file->permissions.dev); 443 inode->i_op = &hfsplus_file_inode_operations; 444 inode->i_fop = &hfsplus_file_operations; 445 inode->i_mapping->a_ops = &hfsplus_aops; 446 } else if (S_ISLNK(inode->i_mode)) { 447 inode->i_op = &page_symlink_inode_operations; 448 inode->i_mapping->a_ops = &hfsplus_aops; 449 } else { 450 init_special_inode(inode, inode->i_mode, 451 be32_to_cpu(file->permissions.dev)); 452 } 453 inode->i_atime = hfsp_mt2ut(file->access_date); 454 inode->i_mtime = hfsp_mt2ut(file->content_mod_date); 455 inode->i_ctime = hfsp_mt2ut(file->attribute_mod_date); 456 HFSPLUS_I(inode).create_date = file->create_date; 457 } else { 458 printk(KERN_ERR "hfs: bad catalog entry used to create inode\n"); 459 res = -EIO; 460 } 461 return res; 462 } 463 464 int hfsplus_cat_write_inode(struct inode *inode) 465 { 466 struct inode *main_inode = inode; 467 struct hfs_find_data fd; 468 hfsplus_cat_entry entry; 469 470 if (HFSPLUS_IS_RSRC(inode)) 471 main_inode = HFSPLUS_I(inode).rsrc_inode; 472 473 if (!main_inode->i_nlink) 474 return 0; 475 476 if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb).cat_tree, &fd)) 477 /* panic? */ 478 return -EIO; 479 480 if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd)) 481 /* panic? */ 482 goto out; 483 484 if (S_ISDIR(main_inode->i_mode)) { 485 struct hfsplus_cat_folder *folder = &entry.folder; 486 487 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) 488 /* panic? */; 489 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 490 sizeof(struct hfsplus_cat_folder)); 491 /* simple node checks? */ 492 hfsplus_set_perms(inode, &folder->permissions); 493 folder->access_date = hfsp_ut2mt(inode->i_atime); 494 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime); 495 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); 496 folder->valence = cpu_to_be32(inode->i_size - 2); 497 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 498 sizeof(struct hfsplus_cat_folder)); 499 } else if (HFSPLUS_IS_RSRC(inode)) { 500 struct hfsplus_cat_file *file = &entry.file; 501 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 502 sizeof(struct hfsplus_cat_file)); 503 hfsplus_inode_write_fork(inode, &file->rsrc_fork); 504 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 505 sizeof(struct hfsplus_cat_file)); 506 } else { 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 hfsplus_inode_write_fork(inode, &file->data_fork); 514 if (S_ISREG(inode->i_mode)) 515 HFSPLUS_I(inode).dev = inode->i_nlink; 516 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 517 HFSPLUS_I(inode).dev = kdev_t_to_nr(inode->i_rdev); 518 hfsplus_set_perms(inode, &file->permissions); 519 if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE) 520 file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED); 521 else 522 file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED); 523 file->access_date = hfsp_ut2mt(inode->i_atime); 524 file->content_mod_date = hfsp_ut2mt(inode->i_mtime); 525 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); 526 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 527 sizeof(struct hfsplus_cat_file)); 528 } 529 out: 530 hfs_find_exit(&fd); 531 return 0; 532 } 533