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