1 /* 2 * linux/fs/hfsplus/super.c 3 * 4 * Copyright (C) 2001 5 * Brad Boyer (flar@allandria.com) 6 * (C) 2003 Ardis Technologies <roman@ardistech.com> 7 * 8 */ 9 10 #include <linux/module.h> 11 #include <linux/init.h> 12 #include <linux/pagemap.h> 13 #include <linux/blkdev.h> 14 #include <linux/fs.h> 15 #include <linux/slab.h> 16 #include <linux/vfs.h> 17 #include <linux/nls.h> 18 19 static struct inode *hfsplus_alloc_inode(struct super_block *sb); 20 static void hfsplus_destroy_inode(struct inode *inode); 21 22 #include "hfsplus_fs.h" 23 24 static int hfsplus_system_read_inode(struct inode *inode) 25 { 26 struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr; 27 28 switch (inode->i_ino) { 29 case HFSPLUS_EXT_CNID: 30 hfsplus_inode_read_fork(inode, &vhdr->ext_file); 31 inode->i_mapping->a_ops = &hfsplus_btree_aops; 32 break; 33 case HFSPLUS_CAT_CNID: 34 hfsplus_inode_read_fork(inode, &vhdr->cat_file); 35 inode->i_mapping->a_ops = &hfsplus_btree_aops; 36 break; 37 case HFSPLUS_ALLOC_CNID: 38 hfsplus_inode_read_fork(inode, &vhdr->alloc_file); 39 inode->i_mapping->a_ops = &hfsplus_aops; 40 break; 41 case HFSPLUS_START_CNID: 42 hfsplus_inode_read_fork(inode, &vhdr->start_file); 43 break; 44 case HFSPLUS_ATTR_CNID: 45 hfsplus_inode_read_fork(inode, &vhdr->attr_file); 46 inode->i_mapping->a_ops = &hfsplus_btree_aops; 47 break; 48 default: 49 return -EIO; 50 } 51 52 return 0; 53 } 54 55 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino) 56 { 57 struct hfs_find_data fd; 58 struct inode *inode; 59 int err; 60 61 inode = iget_locked(sb, ino); 62 if (!inode) 63 return ERR_PTR(-ENOMEM); 64 if (!(inode->i_state & I_NEW)) 65 return inode; 66 67 INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list); 68 mutex_init(&HFSPLUS_I(inode)->extents_lock); 69 HFSPLUS_I(inode)->flags = 0; 70 HFSPLUS_I(inode)->extent_state = 0; 71 HFSPLUS_I(inode)->rsrc_inode = NULL; 72 atomic_set(&HFSPLUS_I(inode)->opencnt, 0); 73 74 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || 75 inode->i_ino == HFSPLUS_ROOT_CNID) { 76 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); 77 if (!err) { 78 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); 79 if (!err) 80 err = hfsplus_cat_read_inode(inode, &fd); 81 hfs_find_exit(&fd); 82 } 83 } else { 84 err = hfsplus_system_read_inode(inode); 85 } 86 87 if (err) { 88 iget_failed(inode); 89 return ERR_PTR(err); 90 } 91 92 unlock_new_inode(inode); 93 return inode; 94 } 95 96 static int hfsplus_system_write_inode(struct inode *inode) 97 { 98 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); 99 struct hfsplus_vh *vhdr = sbi->s_vhdr; 100 struct hfsplus_fork_raw *fork; 101 struct hfs_btree *tree = NULL; 102 103 switch (inode->i_ino) { 104 case HFSPLUS_EXT_CNID: 105 fork = &vhdr->ext_file; 106 tree = sbi->ext_tree; 107 break; 108 case HFSPLUS_CAT_CNID: 109 fork = &vhdr->cat_file; 110 tree = sbi->cat_tree; 111 break; 112 case HFSPLUS_ALLOC_CNID: 113 fork = &vhdr->alloc_file; 114 break; 115 case HFSPLUS_START_CNID: 116 fork = &vhdr->start_file; 117 break; 118 case HFSPLUS_ATTR_CNID: 119 fork = &vhdr->attr_file; 120 tree = sbi->attr_tree; 121 default: 122 return -EIO; 123 } 124 125 if (fork->total_size != cpu_to_be64(inode->i_size)) { 126 set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags); 127 inode->i_sb->s_dirt = 1; 128 } 129 hfsplus_inode_write_fork(inode, fork); 130 if (tree) 131 hfs_btree_write(tree); 132 return 0; 133 } 134 135 static int hfsplus_write_inode(struct inode *inode, 136 struct writeback_control *wbc) 137 { 138 int err; 139 140 dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino); 141 142 err = hfsplus_ext_write_extent(inode); 143 if (err) 144 return err; 145 146 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || 147 inode->i_ino == HFSPLUS_ROOT_CNID) 148 return hfsplus_cat_write_inode(inode); 149 else 150 return hfsplus_system_write_inode(inode); 151 } 152 153 static void hfsplus_evict_inode(struct inode *inode) 154 { 155 dprint(DBG_INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino); 156 truncate_inode_pages(&inode->i_data, 0); 157 end_writeback(inode); 158 if (HFSPLUS_IS_RSRC(inode)) { 159 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL; 160 iput(HFSPLUS_I(inode)->rsrc_inode); 161 } 162 } 163 164 int hfsplus_sync_fs(struct super_block *sb, int wait) 165 { 166 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 167 struct hfsplus_vh *vhdr = sbi->s_vhdr; 168 int write_backup = 0; 169 int error, error2; 170 171 if (!wait) 172 return 0; 173 174 dprint(DBG_SUPER, "hfsplus_write_super\n"); 175 176 sb->s_dirt = 0; 177 178 /* 179 * Explicitly write out the special metadata inodes. 180 * 181 * While these special inodes are marked as hashed and written 182 * out peridocically by the flusher threads we redirty them 183 * during writeout of normal inodes, and thus the life lock 184 * prevents us from getting the latest state to disk. 185 */ 186 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping); 187 error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping); 188 if (!error) 189 error = error2; 190 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping); 191 if (!error) 192 error = error2; 193 194 mutex_lock(&sbi->vh_mutex); 195 mutex_lock(&sbi->alloc_mutex); 196 vhdr->free_blocks = cpu_to_be32(sbi->free_blocks); 197 vhdr->next_cnid = cpu_to_be32(sbi->next_cnid); 198 vhdr->folder_count = cpu_to_be32(sbi->folder_count); 199 vhdr->file_count = cpu_to_be32(sbi->file_count); 200 201 if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) { 202 memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr)); 203 write_backup = 1; 204 } 205 206 error2 = hfsplus_submit_bio(sb, 207 sbi->part_start + HFSPLUS_VOLHEAD_SECTOR, 208 sbi->s_vhdr_buf, NULL, WRITE_SYNC); 209 if (!error) 210 error = error2; 211 if (!write_backup) 212 goto out; 213 214 error2 = hfsplus_submit_bio(sb, 215 sbi->part_start + sbi->sect_count - 2, 216 sbi->s_backup_vhdr_buf, NULL, WRITE_SYNC); 217 if (!error) 218 error2 = error; 219 out: 220 mutex_unlock(&sbi->alloc_mutex); 221 mutex_unlock(&sbi->vh_mutex); 222 223 if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags)) 224 blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL); 225 226 return error; 227 } 228 229 static void hfsplus_write_super(struct super_block *sb) 230 { 231 if (!(sb->s_flags & MS_RDONLY)) 232 hfsplus_sync_fs(sb, 1); 233 else 234 sb->s_dirt = 0; 235 } 236 237 static void hfsplus_put_super(struct super_block *sb) 238 { 239 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 240 241 dprint(DBG_SUPER, "hfsplus_put_super\n"); 242 243 if (!sb->s_fs_info) 244 return; 245 246 if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) { 247 struct hfsplus_vh *vhdr = sbi->s_vhdr; 248 249 vhdr->modify_date = hfsp_now2mt(); 250 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT); 251 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT); 252 253 hfsplus_sync_fs(sb, 1); 254 } 255 256 hfs_btree_close(sbi->cat_tree); 257 hfs_btree_close(sbi->ext_tree); 258 iput(sbi->alloc_file); 259 iput(sbi->hidden_dir); 260 kfree(sbi->s_vhdr_buf); 261 kfree(sbi->s_backup_vhdr_buf); 262 unload_nls(sbi->nls); 263 kfree(sb->s_fs_info); 264 sb->s_fs_info = NULL; 265 } 266 267 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf) 268 { 269 struct super_block *sb = dentry->d_sb; 270 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 271 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 272 273 buf->f_type = HFSPLUS_SUPER_MAGIC; 274 buf->f_bsize = sb->s_blocksize; 275 buf->f_blocks = sbi->total_blocks << sbi->fs_shift; 276 buf->f_bfree = sbi->free_blocks << sbi->fs_shift; 277 buf->f_bavail = buf->f_bfree; 278 buf->f_files = 0xFFFFFFFF; 279 buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid; 280 buf->f_fsid.val[0] = (u32)id; 281 buf->f_fsid.val[1] = (u32)(id >> 32); 282 buf->f_namelen = HFSPLUS_MAX_STRLEN; 283 284 return 0; 285 } 286 287 static int hfsplus_remount(struct super_block *sb, int *flags, char *data) 288 { 289 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 290 return 0; 291 if (!(*flags & MS_RDONLY)) { 292 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr; 293 int force = 0; 294 295 if (!hfsplus_parse_options_remount(data, &force)) 296 return -EINVAL; 297 298 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 299 printk(KERN_WARNING "hfs: filesystem was " 300 "not cleanly unmounted, " 301 "running fsck.hfsplus is recommended. " 302 "leaving read-only.\n"); 303 sb->s_flags |= MS_RDONLY; 304 *flags |= MS_RDONLY; 305 } else if (force) { 306 /* nothing */ 307 } else if (vhdr->attributes & 308 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 309 printk(KERN_WARNING "hfs: filesystem is marked locked, " 310 "leaving read-only.\n"); 311 sb->s_flags |= MS_RDONLY; 312 *flags |= MS_RDONLY; 313 } else if (vhdr->attributes & 314 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) { 315 printk(KERN_WARNING "hfs: filesystem is " 316 "marked journaled, " 317 "leaving read-only.\n"); 318 sb->s_flags |= MS_RDONLY; 319 *flags |= MS_RDONLY; 320 } 321 } 322 return 0; 323 } 324 325 static const struct super_operations hfsplus_sops = { 326 .alloc_inode = hfsplus_alloc_inode, 327 .destroy_inode = hfsplus_destroy_inode, 328 .write_inode = hfsplus_write_inode, 329 .evict_inode = hfsplus_evict_inode, 330 .put_super = hfsplus_put_super, 331 .write_super = hfsplus_write_super, 332 .sync_fs = hfsplus_sync_fs, 333 .statfs = hfsplus_statfs, 334 .remount_fs = hfsplus_remount, 335 .show_options = hfsplus_show_options, 336 }; 337 338 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent) 339 { 340 struct hfsplus_vh *vhdr; 341 struct hfsplus_sb_info *sbi; 342 hfsplus_cat_entry entry; 343 struct hfs_find_data fd; 344 struct inode *root, *inode; 345 struct qstr str; 346 struct nls_table *nls = NULL; 347 int err; 348 349 err = -EINVAL; 350 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 351 if (!sbi) 352 goto out; 353 354 sb->s_fs_info = sbi; 355 mutex_init(&sbi->alloc_mutex); 356 mutex_init(&sbi->vh_mutex); 357 hfsplus_fill_defaults(sbi); 358 359 err = -EINVAL; 360 if (!hfsplus_parse_options(data, sbi)) { 361 printk(KERN_ERR "hfs: unable to parse mount options\n"); 362 goto out_unload_nls; 363 } 364 365 /* temporarily use utf8 to correctly find the hidden dir below */ 366 nls = sbi->nls; 367 sbi->nls = load_nls("utf8"); 368 if (!sbi->nls) { 369 printk(KERN_ERR "hfs: unable to load nls for utf8\n"); 370 goto out_unload_nls; 371 } 372 373 /* Grab the volume header */ 374 if (hfsplus_read_wrapper(sb)) { 375 if (!silent) 376 printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n"); 377 goto out_unload_nls; 378 } 379 vhdr = sbi->s_vhdr; 380 381 /* Copy parts of the volume header into the superblock */ 382 sb->s_magic = HFSPLUS_VOLHEAD_SIG; 383 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION || 384 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) { 385 printk(KERN_ERR "hfs: wrong filesystem version\n"); 386 goto out_free_vhdr; 387 } 388 sbi->total_blocks = be32_to_cpu(vhdr->total_blocks); 389 sbi->free_blocks = be32_to_cpu(vhdr->free_blocks); 390 sbi->next_cnid = be32_to_cpu(vhdr->next_cnid); 391 sbi->file_count = be32_to_cpu(vhdr->file_count); 392 sbi->folder_count = be32_to_cpu(vhdr->folder_count); 393 sbi->data_clump_blocks = 394 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift; 395 if (!sbi->data_clump_blocks) 396 sbi->data_clump_blocks = 1; 397 sbi->rsrc_clump_blocks = 398 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift; 399 if (!sbi->rsrc_clump_blocks) 400 sbi->rsrc_clump_blocks = 1; 401 402 err = generic_check_addressable(sbi->alloc_blksz_shift, 403 sbi->total_blocks); 404 if (err) { 405 printk(KERN_ERR "hfs: filesystem size too large.\n"); 406 goto out_free_vhdr; 407 } 408 409 /* Set up operations so we can load metadata */ 410 sb->s_op = &hfsplus_sops; 411 sb->s_maxbytes = MAX_LFS_FILESIZE; 412 413 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 414 printk(KERN_WARNING "hfs: Filesystem was " 415 "not cleanly unmounted, " 416 "running fsck.hfsplus is recommended. " 417 "mounting read-only.\n"); 418 sb->s_flags |= MS_RDONLY; 419 } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) { 420 /* nothing */ 421 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 422 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n"); 423 sb->s_flags |= MS_RDONLY; 424 } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && 425 !(sb->s_flags & MS_RDONLY)) { 426 printk(KERN_WARNING "hfs: write access to " 427 "a journaled filesystem is not supported, " 428 "use the force option at your own risk, " 429 "mounting read-only.\n"); 430 sb->s_flags |= MS_RDONLY; 431 } 432 433 err = -EINVAL; 434 435 /* Load metadata objects (B*Trees) */ 436 sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID); 437 if (!sbi->ext_tree) { 438 printk(KERN_ERR "hfs: failed to load extents file\n"); 439 goto out_free_vhdr; 440 } 441 sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID); 442 if (!sbi->cat_tree) { 443 printk(KERN_ERR "hfs: failed to load catalog file\n"); 444 goto out_close_ext_tree; 445 } 446 447 inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID); 448 if (IS_ERR(inode)) { 449 printk(KERN_ERR "hfs: failed to load allocation file\n"); 450 err = PTR_ERR(inode); 451 goto out_close_cat_tree; 452 } 453 sbi->alloc_file = inode; 454 455 /* Load the root directory */ 456 root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID); 457 if (IS_ERR(root)) { 458 printk(KERN_ERR "hfs: failed to load root directory\n"); 459 err = PTR_ERR(root); 460 goto out_put_alloc_file; 461 } 462 463 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1; 464 str.name = HFSP_HIDDENDIR_NAME; 465 err = hfs_find_init(sbi->cat_tree, &fd); 466 if (err) 467 goto out_put_root; 468 hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str); 469 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) { 470 hfs_find_exit(&fd); 471 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) 472 goto out_put_root; 473 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id)); 474 if (IS_ERR(inode)) { 475 err = PTR_ERR(inode); 476 goto out_put_root; 477 } 478 sbi->hidden_dir = inode; 479 } else 480 hfs_find_exit(&fd); 481 482 if (!(sb->s_flags & MS_RDONLY)) { 483 /* 484 * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused 485 * all three are registered with Apple for our use 486 */ 487 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION); 488 vhdr->modify_date = hfsp_now2mt(); 489 be32_add_cpu(&vhdr->write_count, 1); 490 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT); 491 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT); 492 hfsplus_sync_fs(sb, 1); 493 494 if (!sbi->hidden_dir) { 495 mutex_lock(&sbi->vh_mutex); 496 sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR); 497 hfsplus_create_cat(sbi->hidden_dir->i_ino, root, &str, 498 sbi->hidden_dir); 499 mutex_unlock(&sbi->vh_mutex); 500 501 hfsplus_mark_inode_dirty(sbi->hidden_dir, 502 HFSPLUS_I_CAT_DIRTY); 503 } 504 } 505 506 sb->s_d_op = &hfsplus_dentry_operations; 507 sb->s_root = d_alloc_root(root); 508 if (!sb->s_root) { 509 err = -ENOMEM; 510 goto out_put_hidden_dir; 511 } 512 513 unload_nls(sbi->nls); 514 sbi->nls = nls; 515 return 0; 516 517 out_put_hidden_dir: 518 iput(sbi->hidden_dir); 519 out_put_root: 520 iput(root); 521 out_put_alloc_file: 522 iput(sbi->alloc_file); 523 out_close_cat_tree: 524 hfs_btree_close(sbi->cat_tree); 525 out_close_ext_tree: 526 hfs_btree_close(sbi->ext_tree); 527 out_free_vhdr: 528 kfree(sbi->s_vhdr); 529 kfree(sbi->s_backup_vhdr); 530 out_unload_nls: 531 unload_nls(sbi->nls); 532 unload_nls(nls); 533 kfree(sbi); 534 out: 535 return err; 536 } 537 538 MODULE_AUTHOR("Brad Boyer"); 539 MODULE_DESCRIPTION("Extended Macintosh Filesystem"); 540 MODULE_LICENSE("GPL"); 541 542 static struct kmem_cache *hfsplus_inode_cachep; 543 544 static struct inode *hfsplus_alloc_inode(struct super_block *sb) 545 { 546 struct hfsplus_inode_info *i; 547 548 i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL); 549 return i ? &i->vfs_inode : NULL; 550 } 551 552 static void hfsplus_i_callback(struct rcu_head *head) 553 { 554 struct inode *inode = container_of(head, struct inode, i_rcu); 555 556 INIT_LIST_HEAD(&inode->i_dentry); 557 kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode)); 558 } 559 560 static void hfsplus_destroy_inode(struct inode *inode) 561 { 562 call_rcu(&inode->i_rcu, hfsplus_i_callback); 563 } 564 565 #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info) 566 567 static struct dentry *hfsplus_mount(struct file_system_type *fs_type, 568 int flags, const char *dev_name, void *data) 569 { 570 return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super); 571 } 572 573 static struct file_system_type hfsplus_fs_type = { 574 .owner = THIS_MODULE, 575 .name = "hfsplus", 576 .mount = hfsplus_mount, 577 .kill_sb = kill_block_super, 578 .fs_flags = FS_REQUIRES_DEV, 579 }; 580 581 static void hfsplus_init_once(void *p) 582 { 583 struct hfsplus_inode_info *i = p; 584 585 inode_init_once(&i->vfs_inode); 586 } 587 588 static int __init init_hfsplus_fs(void) 589 { 590 int err; 591 592 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache", 593 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN, 594 hfsplus_init_once); 595 if (!hfsplus_inode_cachep) 596 return -ENOMEM; 597 err = register_filesystem(&hfsplus_fs_type); 598 if (err) 599 kmem_cache_destroy(hfsplus_inode_cachep); 600 return err; 601 } 602 603 static void __exit exit_hfsplus_fs(void) 604 { 605 unregister_filesystem(&hfsplus_fs_type); 606 kmem_cache_destroy(hfsplus_inode_cachep); 607 } 608 609 module_init(init_hfsplus_fs) 610 module_exit(exit_hfsplus_fs) 611