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 //printk("readpage: %lu\n", page->index); 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 //printk("writepage: %lu\n", page->index); 28 return block_write_full_page(page, hfsplus_get_block, wbc); 29 } 30 31 static int hfsplus_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to) 32 { 33 return cont_prepare_write(page, from, to, hfsplus_get_block, 34 &HFSPLUS_I(page->mapping->host).phys_size); 35 } 36 37 static sector_t hfsplus_bmap(struct address_space *mapping, sector_t block) 38 { 39 return generic_block_bmap(mapping, block, hfsplus_get_block); 40 } 41 42 static int hfsplus_releasepage(struct page *page, gfp_t mask) 43 { 44 struct inode *inode = page->mapping->host; 45 struct super_block *sb = inode->i_sb; 46 struct hfs_btree *tree; 47 struct hfs_bnode *node; 48 u32 nidx; 49 int i, res = 1; 50 51 switch (inode->i_ino) { 52 case HFSPLUS_EXT_CNID: 53 tree = HFSPLUS_SB(sb).ext_tree; 54 break; 55 case HFSPLUS_CAT_CNID: 56 tree = HFSPLUS_SB(sb).cat_tree; 57 break; 58 case HFSPLUS_ATTR_CNID: 59 tree = HFSPLUS_SB(sb).attr_tree; 60 break; 61 default: 62 BUG(); 63 return 0; 64 } 65 if (tree->node_size >= PAGE_CACHE_SIZE) { 66 nidx = page->index >> (tree->node_size_shift - PAGE_CACHE_SHIFT); 67 spin_lock(&tree->hash_lock); 68 node = hfs_bnode_findhash(tree, nidx); 69 if (!node) 70 ; 71 else if (atomic_read(&node->refcnt)) 72 res = 0; 73 if (res && node) { 74 hfs_bnode_unhash(node); 75 hfs_bnode_free(node); 76 } 77 spin_unlock(&tree->hash_lock); 78 } else { 79 nidx = page->index << (PAGE_CACHE_SHIFT - tree->node_size_shift); 80 i = 1 << (PAGE_CACHE_SHIFT - tree->node_size_shift); 81 spin_lock(&tree->hash_lock); 82 do { 83 node = hfs_bnode_findhash(tree, nidx++); 84 if (!node) 85 continue; 86 if (atomic_read(&node->refcnt)) { 87 res = 0; 88 break; 89 } 90 hfs_bnode_unhash(node); 91 hfs_bnode_free(node); 92 } while (--i && nidx < tree->node_count); 93 spin_unlock(&tree->hash_lock); 94 } 95 //printk("releasepage: %lu,%x = %d\n", page->index, mask, res); 96 return res ? try_to_free_buffers(page) : 0; 97 } 98 99 static int hfsplus_get_blocks(struct inode *inode, sector_t iblock, unsigned long max_blocks, 100 struct buffer_head *bh_result, int create) 101 { 102 int ret; 103 104 ret = hfsplus_get_block(inode, iblock, bh_result, create); 105 if (!ret) 106 bh_result->b_size = (1 << inode->i_blkbits); 107 return ret; 108 } 109 110 static ssize_t hfsplus_direct_IO(int rw, struct kiocb *iocb, 111 const struct iovec *iov, loff_t offset, unsigned long nr_segs) 112 { 113 struct file *file = iocb->ki_filp; 114 struct inode *inode = file->f_dentry->d_inode->i_mapping->host; 115 116 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, 117 offset, nr_segs, hfsplus_get_blocks, NULL); 118 } 119 120 static int hfsplus_writepages(struct address_space *mapping, 121 struct writeback_control *wbc) 122 { 123 return mpage_writepages(mapping, wbc, hfsplus_get_block); 124 } 125 126 struct address_space_operations hfsplus_btree_aops = { 127 .readpage = hfsplus_readpage, 128 .writepage = hfsplus_writepage, 129 .sync_page = block_sync_page, 130 .prepare_write = hfsplus_prepare_write, 131 .commit_write = generic_commit_write, 132 .bmap = hfsplus_bmap, 133 .releasepage = hfsplus_releasepage, 134 }; 135 136 struct address_space_operations hfsplus_aops = { 137 .readpage = hfsplus_readpage, 138 .writepage = hfsplus_writepage, 139 .sync_page = block_sync_page, 140 .prepare_write = hfsplus_prepare_write, 141 .commit_write = generic_commit_write, 142 .bmap = hfsplus_bmap, 143 .direct_IO = hfsplus_direct_IO, 144 .writepages = hfsplus_writepages, 145 }; 146 147 static struct dentry *hfsplus_file_lookup(struct inode *dir, struct dentry *dentry, 148 struct nameidata *nd) 149 { 150 struct hfs_find_data fd; 151 struct super_block *sb = dir->i_sb; 152 struct inode *inode = NULL; 153 int err; 154 155 if (HFSPLUS_IS_RSRC(dir) || strcmp(dentry->d_name.name, "rsrc")) 156 goto out; 157 158 inode = HFSPLUS_I(dir).rsrc_inode; 159 if (inode) 160 goto out; 161 162 inode = new_inode(sb); 163 if (!inode) 164 return ERR_PTR(-ENOMEM); 165 166 inode->i_ino = dir->i_ino; 167 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list); 168 init_MUTEX(&HFSPLUS_I(inode).extents_lock); 169 HFSPLUS_I(inode).flags = HFSPLUS_FLG_RSRC; 170 171 hfs_find_init(HFSPLUS_SB(sb).cat_tree, &fd); 172 err = hfsplus_find_cat(sb, dir->i_ino, &fd); 173 if (!err) 174 err = hfsplus_cat_read_inode(inode, &fd); 175 hfs_find_exit(&fd); 176 if (err) { 177 iput(inode); 178 return ERR_PTR(err); 179 } 180 HFSPLUS_I(inode).rsrc_inode = dir; 181 HFSPLUS_I(dir).rsrc_inode = inode; 182 igrab(dir); 183 hlist_add_head(&inode->i_hash, &HFSPLUS_SB(sb).rsrc_inodes); 184 mark_inode_dirty(inode); 185 out: 186 d_add(dentry, inode); 187 return NULL; 188 } 189 190 static void hfsplus_get_perms(struct inode *inode, struct hfsplus_perm *perms, int dir) 191 { 192 struct super_block *sb = inode->i_sb; 193 u16 mode; 194 195 mode = be16_to_cpu(perms->mode); 196 197 inode->i_uid = be32_to_cpu(perms->owner); 198 if (!inode->i_uid && !mode) 199 inode->i_uid = HFSPLUS_SB(sb).uid; 200 201 inode->i_gid = be32_to_cpu(perms->group); 202 if (!inode->i_gid && !mode) 203 inode->i_gid = HFSPLUS_SB(sb).gid; 204 205 if (dir) { 206 mode = mode ? (mode & S_IALLUGO) : 207 (S_IRWXUGO & ~(HFSPLUS_SB(sb).umask)); 208 mode |= S_IFDIR; 209 } else if (!mode) 210 mode = S_IFREG | ((S_IRUGO|S_IWUGO) & 211 ~(HFSPLUS_SB(sb).umask)); 212 inode->i_mode = mode; 213 214 HFSPLUS_I(inode).rootflags = perms->rootflags; 215 HFSPLUS_I(inode).userflags = perms->userflags; 216 if (perms->rootflags & HFSPLUS_FLG_IMMUTABLE) 217 inode->i_flags |= S_IMMUTABLE; 218 else 219 inode->i_flags &= ~S_IMMUTABLE; 220 if (perms->rootflags & HFSPLUS_FLG_APPEND) 221 inode->i_flags |= S_APPEND; 222 else 223 inode->i_flags &= ~S_APPEND; 224 } 225 226 static void hfsplus_set_perms(struct inode *inode, struct hfsplus_perm *perms) 227 { 228 if (inode->i_flags & S_IMMUTABLE) 229 perms->rootflags |= HFSPLUS_FLG_IMMUTABLE; 230 else 231 perms->rootflags &= ~HFSPLUS_FLG_IMMUTABLE; 232 if (inode->i_flags & S_APPEND) 233 perms->rootflags |= HFSPLUS_FLG_APPEND; 234 else 235 perms->rootflags &= ~HFSPLUS_FLG_APPEND; 236 perms->userflags = HFSPLUS_I(inode).userflags; 237 perms->mode = cpu_to_be16(inode->i_mode); 238 perms->owner = cpu_to_be32(inode->i_uid); 239 perms->group = cpu_to_be32(inode->i_gid); 240 perms->dev = cpu_to_be32(HFSPLUS_I(inode).dev); 241 } 242 243 static int hfsplus_permission(struct inode *inode, int mask, struct nameidata *nd) 244 { 245 /* MAY_EXEC is also used for lookup, if no x bit is set allow lookup, 246 * open_exec has the same test, so it's still not executable, if a x bit 247 * is set fall back to standard permission check. 248 */ 249 if (S_ISREG(inode->i_mode) && mask & MAY_EXEC && !(inode->i_mode & 0111)) 250 return 0; 251 return generic_permission(inode, mask, NULL); 252 } 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 (atomic_read(&file->f_count) != 1) 260 return 0; 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_read(&file->f_count) != 0) 272 return 0; 273 if (atomic_dec_and_test(&HFSPLUS_I(inode).opencnt)) { 274 mutex_lock(&inode->i_mutex); 275 hfsplus_file_truncate(inode); 276 if (inode->i_flags & S_DEAD) { 277 hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL); 278 hfsplus_delete_inode(inode); 279 } 280 mutex_unlock(&inode->i_mutex); 281 } 282 return 0; 283 } 284 285 extern struct inode_operations hfsplus_dir_inode_operations; 286 extern struct file_operations hfsplus_dir_operations; 287 288 static struct inode_operations hfsplus_file_inode_operations = { 289 .lookup = hfsplus_file_lookup, 290 .truncate = hfsplus_file_truncate, 291 .permission = hfsplus_permission, 292 .setxattr = hfsplus_setxattr, 293 .getxattr = hfsplus_getxattr, 294 .listxattr = hfsplus_listxattr, 295 }; 296 297 static struct file_operations hfsplus_file_operations = { 298 .llseek = generic_file_llseek, 299 .read = generic_file_read, 300 .write = generic_file_write, 301 .mmap = generic_file_mmap, 302 .sendfile = generic_file_sendfile, 303 .fsync = file_fsync, 304 .open = hfsplus_file_open, 305 .release = hfsplus_file_release, 306 .ioctl = hfsplus_ioctl, 307 }; 308 309 struct inode *hfsplus_new_inode(struct super_block *sb, int mode) 310 { 311 struct inode *inode = new_inode(sb); 312 if (!inode) 313 return NULL; 314 315 inode->i_ino = HFSPLUS_SB(sb).next_cnid++; 316 inode->i_mode = mode; 317 inode->i_uid = current->fsuid; 318 inode->i_gid = current->fsgid; 319 inode->i_nlink = 1; 320 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; 321 inode->i_blksize = HFSPLUS_SB(sb).alloc_blksz; 322 INIT_LIST_HEAD(&HFSPLUS_I(inode).open_dir_list); 323 init_MUTEX(&HFSPLUS_I(inode).extents_lock); 324 atomic_set(&HFSPLUS_I(inode).opencnt, 0); 325 HFSPLUS_I(inode).flags = 0; 326 memset(HFSPLUS_I(inode).first_extents, 0, sizeof(hfsplus_extent_rec)); 327 memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec)); 328 HFSPLUS_I(inode).alloc_blocks = 0; 329 HFSPLUS_I(inode).first_blocks = 0; 330 HFSPLUS_I(inode).cached_start = 0; 331 HFSPLUS_I(inode).cached_blocks = 0; 332 HFSPLUS_I(inode).phys_size = 0; 333 HFSPLUS_I(inode).fs_blocks = 0; 334 HFSPLUS_I(inode).rsrc_inode = NULL; 335 if (S_ISDIR(inode->i_mode)) { 336 inode->i_size = 2; 337 HFSPLUS_SB(sb).folder_count++; 338 inode->i_op = &hfsplus_dir_inode_operations; 339 inode->i_fop = &hfsplus_dir_operations; 340 } else if (S_ISREG(inode->i_mode)) { 341 HFSPLUS_SB(sb).file_count++; 342 inode->i_op = &hfsplus_file_inode_operations; 343 inode->i_fop = &hfsplus_file_operations; 344 inode->i_mapping->a_ops = &hfsplus_aops; 345 HFSPLUS_I(inode).clump_blocks = HFSPLUS_SB(sb).data_clump_blocks; 346 } else if (S_ISLNK(inode->i_mode)) { 347 HFSPLUS_SB(sb).file_count++; 348 inode->i_op = &page_symlink_inode_operations; 349 inode->i_mapping->a_ops = &hfsplus_aops; 350 HFSPLUS_I(inode).clump_blocks = 1; 351 } else 352 HFSPLUS_SB(sb).file_count++; 353 insert_inode_hash(inode); 354 mark_inode_dirty(inode); 355 sb->s_dirt = 1; 356 357 return inode; 358 } 359 360 void hfsplus_delete_inode(struct inode *inode) 361 { 362 struct super_block *sb = inode->i_sb; 363 364 if (S_ISDIR(inode->i_mode)) { 365 HFSPLUS_SB(sb).folder_count--; 366 sb->s_dirt = 1; 367 return; 368 } 369 HFSPLUS_SB(sb).file_count--; 370 if (S_ISREG(inode->i_mode)) { 371 if (!inode->i_nlink) { 372 inode->i_size = 0; 373 hfsplus_file_truncate(inode); 374 } 375 } else if (S_ISLNK(inode->i_mode)) { 376 inode->i_size = 0; 377 hfsplus_file_truncate(inode); 378 } 379 sb->s_dirt = 1; 380 } 381 382 void hfsplus_inode_read_fork(struct inode *inode, struct hfsplus_fork_raw *fork) 383 { 384 struct super_block *sb = inode->i_sb; 385 u32 count; 386 int i; 387 388 memcpy(&HFSPLUS_I(inode).first_extents, &fork->extents, 389 sizeof(hfsplus_extent_rec)); 390 for (count = 0, i = 0; i < 8; i++) 391 count += be32_to_cpu(fork->extents[i].block_count); 392 HFSPLUS_I(inode).first_blocks = count; 393 memset(HFSPLUS_I(inode).cached_extents, 0, sizeof(hfsplus_extent_rec)); 394 HFSPLUS_I(inode).cached_start = 0; 395 HFSPLUS_I(inode).cached_blocks = 0; 396 397 HFSPLUS_I(inode).alloc_blocks = be32_to_cpu(fork->total_blocks); 398 inode->i_size = HFSPLUS_I(inode).phys_size = be64_to_cpu(fork->total_size); 399 HFSPLUS_I(inode).fs_blocks = (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 400 inode_set_bytes(inode, HFSPLUS_I(inode).fs_blocks << sb->s_blocksize_bits); 401 HFSPLUS_I(inode).clump_blocks = be32_to_cpu(fork->clump_size) >> HFSPLUS_SB(sb).alloc_blksz_shift; 402 if (!HFSPLUS_I(inode).clump_blocks) 403 HFSPLUS_I(inode).clump_blocks = HFSPLUS_IS_RSRC(inode) ? HFSPLUS_SB(sb).rsrc_clump_blocks : 404 HFSPLUS_SB(sb).data_clump_blocks; 405 } 406 407 void hfsplus_inode_write_fork(struct inode *inode, struct hfsplus_fork_raw *fork) 408 { 409 memcpy(&fork->extents, &HFSPLUS_I(inode).first_extents, 410 sizeof(hfsplus_extent_rec)); 411 fork->total_size = cpu_to_be64(inode->i_size); 412 fork->total_blocks = cpu_to_be32(HFSPLUS_I(inode).alloc_blocks); 413 } 414 415 int hfsplus_cat_read_inode(struct inode *inode, struct hfs_find_data *fd) 416 { 417 hfsplus_cat_entry entry; 418 int res = 0; 419 u16 type; 420 421 type = hfs_bnode_read_u16(fd->bnode, fd->entryoffset); 422 423 HFSPLUS_I(inode).dev = 0; 424 inode->i_blksize = HFSPLUS_SB(inode->i_sb).alloc_blksz; 425 if (type == HFSPLUS_FOLDER) { 426 struct hfsplus_cat_folder *folder = &entry.folder; 427 428 if (fd->entrylength < sizeof(struct hfsplus_cat_folder)) 429 /* panic? */; 430 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, 431 sizeof(struct hfsplus_cat_folder)); 432 hfsplus_get_perms(inode, &folder->permissions, 1); 433 inode->i_nlink = 1; 434 inode->i_size = 2 + be32_to_cpu(folder->valence); 435 inode->i_atime = hfsp_mt2ut(folder->access_date); 436 inode->i_mtime = hfsp_mt2ut(folder->content_mod_date); 437 inode->i_ctime = inode->i_mtime; 438 HFSPLUS_I(inode).fs_blocks = 0; 439 inode->i_op = &hfsplus_dir_inode_operations; 440 inode->i_fop = &hfsplus_dir_operations; 441 } else if (type == HFSPLUS_FILE) { 442 struct hfsplus_cat_file *file = &entry.file; 443 444 if (fd->entrylength < sizeof(struct hfsplus_cat_file)) 445 /* panic? */; 446 hfs_bnode_read(fd->bnode, &entry, fd->entryoffset, 447 sizeof(struct hfsplus_cat_file)); 448 449 hfsplus_inode_read_fork(inode, HFSPLUS_IS_DATA(inode) ? 450 &file->data_fork : &file->rsrc_fork); 451 hfsplus_get_perms(inode, &file->permissions, 0); 452 inode->i_nlink = 1; 453 if (S_ISREG(inode->i_mode)) { 454 if (file->permissions.dev) 455 inode->i_nlink = be32_to_cpu(file->permissions.dev); 456 inode->i_op = &hfsplus_file_inode_operations; 457 inode->i_fop = &hfsplus_file_operations; 458 inode->i_mapping->a_ops = &hfsplus_aops; 459 } else if (S_ISLNK(inode->i_mode)) { 460 inode->i_op = &page_symlink_inode_operations; 461 inode->i_mapping->a_ops = &hfsplus_aops; 462 } else { 463 init_special_inode(inode, inode->i_mode, 464 be32_to_cpu(file->permissions.dev)); 465 } 466 inode->i_atime = hfsp_mt2ut(file->access_date); 467 inode->i_mtime = hfsp_mt2ut(file->content_mod_date); 468 inode->i_ctime = inode->i_mtime; 469 } else { 470 printk("HFS+-fs: bad catalog entry used to create inode\n"); 471 res = -EIO; 472 } 473 return res; 474 } 475 476 int hfsplus_cat_write_inode(struct inode *inode) 477 { 478 struct inode *main_inode = inode; 479 struct hfs_find_data fd; 480 hfsplus_cat_entry entry; 481 482 if (HFSPLUS_IS_RSRC(inode)) 483 main_inode = HFSPLUS_I(inode).rsrc_inode; 484 485 if (!main_inode->i_nlink) 486 return 0; 487 488 if (hfs_find_init(HFSPLUS_SB(main_inode->i_sb).cat_tree, &fd)) 489 /* panic? */ 490 return -EIO; 491 492 if (hfsplus_find_cat(main_inode->i_sb, main_inode->i_ino, &fd)) 493 /* panic? */ 494 goto out; 495 496 if (S_ISDIR(main_inode->i_mode)) { 497 struct hfsplus_cat_folder *folder = &entry.folder; 498 499 if (fd.entrylength < sizeof(struct hfsplus_cat_folder)) 500 /* panic? */; 501 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 502 sizeof(struct hfsplus_cat_folder)); 503 /* simple node checks? */ 504 hfsplus_set_perms(inode, &folder->permissions); 505 folder->access_date = hfsp_ut2mt(inode->i_atime); 506 folder->content_mod_date = hfsp_ut2mt(inode->i_mtime); 507 folder->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); 508 folder->valence = cpu_to_be32(inode->i_size - 2); 509 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 510 sizeof(struct hfsplus_cat_folder)); 511 } else if (HFSPLUS_IS_RSRC(inode)) { 512 struct hfsplus_cat_file *file = &entry.file; 513 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 514 sizeof(struct hfsplus_cat_file)); 515 hfsplus_inode_write_fork(inode, &file->rsrc_fork); 516 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 517 sizeof(struct hfsplus_cat_file)); 518 } else { 519 struct hfsplus_cat_file *file = &entry.file; 520 521 if (fd.entrylength < sizeof(struct hfsplus_cat_file)) 522 /* panic? */; 523 hfs_bnode_read(fd.bnode, &entry, fd.entryoffset, 524 sizeof(struct hfsplus_cat_file)); 525 hfsplus_inode_write_fork(inode, &file->data_fork); 526 if (S_ISREG(inode->i_mode)) 527 HFSPLUS_I(inode).dev = inode->i_nlink; 528 if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) 529 HFSPLUS_I(inode).dev = kdev_t_to_nr(inode->i_rdev); 530 hfsplus_set_perms(inode, &file->permissions); 531 if ((file->permissions.rootflags | file->permissions.userflags) & HFSPLUS_FLG_IMMUTABLE) 532 file->flags |= cpu_to_be16(HFSPLUS_FILE_LOCKED); 533 else 534 file->flags &= cpu_to_be16(~HFSPLUS_FILE_LOCKED); 535 file->access_date = hfsp_ut2mt(inode->i_atime); 536 file->content_mod_date = hfsp_ut2mt(inode->i_mtime); 537 file->attribute_mod_date = hfsp_ut2mt(inode->i_ctime); 538 hfs_bnode_write(fd.bnode, &entry, fd.entryoffset, 539 sizeof(struct hfsplus_cat_file)); 540 } 541 out: 542 hfs_find_exit(&fd); 543 return 0; 544 } 545