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