1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/fs/hfsplus/super.c 4 * 5 * Copyright (C) 2001 6 * Brad Boyer (flar@allandria.com) 7 * (C) 2003 Ardis Technologies <roman@ardistech.com> 8 * 9 */ 10 11 #include <linux/module.h> 12 #include <linux/init.h> 13 #include <linux/pagemap.h> 14 #include <linux/blkdev.h> 15 #include <linux/backing-dev.h> 16 #include <linux/fs.h> 17 #include <linux/slab.h> 18 #include <linux/vfs.h> 19 #include <linux/nls.h> 20 21 static struct inode *hfsplus_alloc_inode(struct super_block *sb); 22 static void hfsplus_free_inode(struct inode *inode); 23 24 #include "hfsplus_fs.h" 25 #include "xattr.h" 26 27 static int hfsplus_system_read_inode(struct inode *inode) 28 { 29 struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr; 30 31 switch (inode->i_ino) { 32 case HFSPLUS_EXT_CNID: 33 hfsplus_inode_read_fork(inode, &vhdr->ext_file); 34 inode->i_mapping->a_ops = &hfsplus_btree_aops; 35 break; 36 case HFSPLUS_CAT_CNID: 37 hfsplus_inode_read_fork(inode, &vhdr->cat_file); 38 inode->i_mapping->a_ops = &hfsplus_btree_aops; 39 break; 40 case HFSPLUS_ALLOC_CNID: 41 hfsplus_inode_read_fork(inode, &vhdr->alloc_file); 42 inode->i_mapping->a_ops = &hfsplus_aops; 43 break; 44 case HFSPLUS_START_CNID: 45 hfsplus_inode_read_fork(inode, &vhdr->start_file); 46 break; 47 case HFSPLUS_ATTR_CNID: 48 hfsplus_inode_read_fork(inode, &vhdr->attr_file); 49 inode->i_mapping->a_ops = &hfsplus_btree_aops; 50 break; 51 default: 52 return -EIO; 53 } 54 55 return 0; 56 } 57 58 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino) 59 { 60 struct hfs_find_data fd; 61 struct inode *inode; 62 int err; 63 64 inode = iget_locked(sb, ino); 65 if (!inode) 66 return ERR_PTR(-ENOMEM); 67 if (!(inode->i_state & I_NEW)) 68 return inode; 69 70 INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list); 71 spin_lock_init(&HFSPLUS_I(inode)->open_dir_lock); 72 mutex_init(&HFSPLUS_I(inode)->extents_lock); 73 HFSPLUS_I(inode)->flags = 0; 74 HFSPLUS_I(inode)->extent_state = 0; 75 HFSPLUS_I(inode)->rsrc_inode = NULL; 76 atomic_set(&HFSPLUS_I(inode)->opencnt, 0); 77 78 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || 79 inode->i_ino == HFSPLUS_ROOT_CNID) { 80 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); 81 if (!err) { 82 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); 83 if (!err) 84 err = hfsplus_cat_read_inode(inode, &fd); 85 hfs_find_exit(&fd); 86 } 87 } else { 88 err = hfsplus_system_read_inode(inode); 89 } 90 91 if (err) { 92 iget_failed(inode); 93 return ERR_PTR(err); 94 } 95 96 unlock_new_inode(inode); 97 return inode; 98 } 99 100 static int hfsplus_system_write_inode(struct inode *inode) 101 { 102 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); 103 struct hfsplus_vh *vhdr = sbi->s_vhdr; 104 struct hfsplus_fork_raw *fork; 105 struct hfs_btree *tree = NULL; 106 107 switch (inode->i_ino) { 108 case HFSPLUS_EXT_CNID: 109 fork = &vhdr->ext_file; 110 tree = sbi->ext_tree; 111 break; 112 case HFSPLUS_CAT_CNID: 113 fork = &vhdr->cat_file; 114 tree = sbi->cat_tree; 115 break; 116 case HFSPLUS_ALLOC_CNID: 117 fork = &vhdr->alloc_file; 118 break; 119 case HFSPLUS_START_CNID: 120 fork = &vhdr->start_file; 121 break; 122 case HFSPLUS_ATTR_CNID: 123 fork = &vhdr->attr_file; 124 tree = sbi->attr_tree; 125 break; 126 default: 127 return -EIO; 128 } 129 130 if (fork->total_size != cpu_to_be64(inode->i_size)) { 131 set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags); 132 hfsplus_mark_mdb_dirty(inode->i_sb); 133 } 134 hfsplus_inode_write_fork(inode, fork); 135 if (tree) { 136 int err = hfs_btree_write(tree); 137 138 if (err) { 139 pr_err("b-tree write err: %d, ino %lu\n", 140 err, inode->i_ino); 141 return err; 142 } 143 } 144 return 0; 145 } 146 147 static int hfsplus_write_inode(struct inode *inode, 148 struct writeback_control *wbc) 149 { 150 int err; 151 152 hfs_dbg(INODE, "hfsplus_write_inode: %lu\n", inode->i_ino); 153 154 err = hfsplus_ext_write_extent(inode); 155 if (err) 156 return err; 157 158 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || 159 inode->i_ino == HFSPLUS_ROOT_CNID) 160 return hfsplus_cat_write_inode(inode); 161 else 162 return hfsplus_system_write_inode(inode); 163 } 164 165 static void hfsplus_evict_inode(struct inode *inode) 166 { 167 hfs_dbg(INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino); 168 truncate_inode_pages_final(&inode->i_data); 169 clear_inode(inode); 170 if (HFSPLUS_IS_RSRC(inode)) { 171 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL; 172 iput(HFSPLUS_I(inode)->rsrc_inode); 173 } 174 } 175 176 static int hfsplus_sync_fs(struct super_block *sb, int wait) 177 { 178 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 179 struct hfsplus_vh *vhdr = sbi->s_vhdr; 180 int write_backup = 0; 181 int error, error2; 182 183 if (!wait) 184 return 0; 185 186 hfs_dbg(SUPER, "hfsplus_sync_fs\n"); 187 188 /* 189 * Explicitly write out the special metadata inodes. 190 * 191 * While these special inodes are marked as hashed and written 192 * out peridocically by the flusher threads we redirty them 193 * during writeout of normal inodes, and thus the life lock 194 * prevents us from getting the latest state to disk. 195 */ 196 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping); 197 error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping); 198 if (!error) 199 error = error2; 200 if (sbi->attr_tree) { 201 error2 = 202 filemap_write_and_wait(sbi->attr_tree->inode->i_mapping); 203 if (!error) 204 error = error2; 205 } 206 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping); 207 if (!error) 208 error = error2; 209 210 mutex_lock(&sbi->vh_mutex); 211 mutex_lock(&sbi->alloc_mutex); 212 vhdr->free_blocks = cpu_to_be32(sbi->free_blocks); 213 vhdr->next_cnid = cpu_to_be32(sbi->next_cnid); 214 vhdr->folder_count = cpu_to_be32(sbi->folder_count); 215 vhdr->file_count = cpu_to_be32(sbi->file_count); 216 217 if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) { 218 memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr)); 219 write_backup = 1; 220 } 221 222 error2 = hfsplus_submit_bio(sb, 223 sbi->part_start + HFSPLUS_VOLHEAD_SECTOR, 224 sbi->s_vhdr_buf, NULL, REQ_OP_WRITE | 225 REQ_SYNC); 226 if (!error) 227 error = error2; 228 if (!write_backup) 229 goto out; 230 231 error2 = hfsplus_submit_bio(sb, 232 sbi->part_start + sbi->sect_count - 2, 233 sbi->s_backup_vhdr_buf, NULL, REQ_OP_WRITE | 234 REQ_SYNC); 235 if (!error) 236 error2 = error; 237 out: 238 mutex_unlock(&sbi->alloc_mutex); 239 mutex_unlock(&sbi->vh_mutex); 240 241 if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags)) 242 blkdev_issue_flush(sb->s_bdev); 243 244 return error; 245 } 246 247 static void delayed_sync_fs(struct work_struct *work) 248 { 249 int err; 250 struct hfsplus_sb_info *sbi; 251 252 sbi = container_of(work, struct hfsplus_sb_info, sync_work.work); 253 254 spin_lock(&sbi->work_lock); 255 sbi->work_queued = 0; 256 spin_unlock(&sbi->work_lock); 257 258 err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1); 259 if (err) 260 pr_err("delayed sync fs err %d\n", err); 261 } 262 263 void hfsplus_mark_mdb_dirty(struct super_block *sb) 264 { 265 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 266 unsigned long delay; 267 268 if (sb_rdonly(sb)) 269 return; 270 271 spin_lock(&sbi->work_lock); 272 if (!sbi->work_queued) { 273 delay = msecs_to_jiffies(dirty_writeback_interval * 10); 274 queue_delayed_work(system_long_wq, &sbi->sync_work, delay); 275 sbi->work_queued = 1; 276 } 277 spin_unlock(&sbi->work_lock); 278 } 279 280 static void hfsplus_put_super(struct super_block *sb) 281 { 282 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 283 284 hfs_dbg(SUPER, "hfsplus_put_super\n"); 285 286 cancel_delayed_work_sync(&sbi->sync_work); 287 288 if (!sb_rdonly(sb) && sbi->s_vhdr) { 289 struct hfsplus_vh *vhdr = sbi->s_vhdr; 290 291 vhdr->modify_date = hfsp_now2mt(); 292 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT); 293 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT); 294 295 hfsplus_sync_fs(sb, 1); 296 } 297 298 iput(sbi->alloc_file); 299 iput(sbi->hidden_dir); 300 hfs_btree_close(sbi->attr_tree); 301 hfs_btree_close(sbi->cat_tree); 302 hfs_btree_close(sbi->ext_tree); 303 kfree(sbi->s_vhdr_buf); 304 kfree(sbi->s_backup_vhdr_buf); 305 unload_nls(sbi->nls); 306 kfree(sb->s_fs_info); 307 sb->s_fs_info = NULL; 308 } 309 310 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf) 311 { 312 struct super_block *sb = dentry->d_sb; 313 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 314 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 315 316 buf->f_type = HFSPLUS_SUPER_MAGIC; 317 buf->f_bsize = sb->s_blocksize; 318 buf->f_blocks = sbi->total_blocks << sbi->fs_shift; 319 buf->f_bfree = sbi->free_blocks << sbi->fs_shift; 320 buf->f_bavail = buf->f_bfree; 321 buf->f_files = 0xFFFFFFFF; 322 buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid; 323 buf->f_fsid = u64_to_fsid(id); 324 buf->f_namelen = HFSPLUS_MAX_STRLEN; 325 326 return 0; 327 } 328 329 static int hfsplus_remount(struct super_block *sb, int *flags, char *data) 330 { 331 sync_filesystem(sb); 332 if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) 333 return 0; 334 if (!(*flags & SB_RDONLY)) { 335 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr; 336 int force = 0; 337 338 if (!hfsplus_parse_options_remount(data, &force)) 339 return -EINVAL; 340 341 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 342 pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. leaving read-only.\n"); 343 sb->s_flags |= SB_RDONLY; 344 *flags |= SB_RDONLY; 345 } else if (force) { 346 /* nothing */ 347 } else if (vhdr->attributes & 348 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 349 pr_warn("filesystem is marked locked, leaving read-only.\n"); 350 sb->s_flags |= SB_RDONLY; 351 *flags |= SB_RDONLY; 352 } else if (vhdr->attributes & 353 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) { 354 pr_warn("filesystem is marked journaled, leaving read-only.\n"); 355 sb->s_flags |= SB_RDONLY; 356 *flags |= SB_RDONLY; 357 } 358 } 359 return 0; 360 } 361 362 static const struct super_operations hfsplus_sops = { 363 .alloc_inode = hfsplus_alloc_inode, 364 .free_inode = hfsplus_free_inode, 365 .write_inode = hfsplus_write_inode, 366 .evict_inode = hfsplus_evict_inode, 367 .put_super = hfsplus_put_super, 368 .sync_fs = hfsplus_sync_fs, 369 .statfs = hfsplus_statfs, 370 .remount_fs = hfsplus_remount, 371 .show_options = hfsplus_show_options, 372 }; 373 374 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent) 375 { 376 struct hfsplus_vh *vhdr; 377 struct hfsplus_sb_info *sbi; 378 hfsplus_cat_entry entry; 379 struct hfs_find_data fd; 380 struct inode *root, *inode; 381 struct qstr str; 382 struct nls_table *nls = NULL; 383 u64 last_fs_block, last_fs_page; 384 int err; 385 386 err = -ENOMEM; 387 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 388 if (!sbi) 389 goto out; 390 391 sb->s_fs_info = sbi; 392 mutex_init(&sbi->alloc_mutex); 393 mutex_init(&sbi->vh_mutex); 394 spin_lock_init(&sbi->work_lock); 395 INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs); 396 hfsplus_fill_defaults(sbi); 397 398 err = -EINVAL; 399 if (!hfsplus_parse_options(data, sbi)) { 400 pr_err("unable to parse mount options\n"); 401 goto out_unload_nls; 402 } 403 404 /* temporarily use utf8 to correctly find the hidden dir below */ 405 nls = sbi->nls; 406 sbi->nls = load_nls("utf8"); 407 if (!sbi->nls) { 408 pr_err("unable to load nls for utf8\n"); 409 goto out_unload_nls; 410 } 411 412 /* Grab the volume header */ 413 if (hfsplus_read_wrapper(sb)) { 414 if (!silent) 415 pr_warn("unable to find HFS+ superblock\n"); 416 goto out_unload_nls; 417 } 418 vhdr = sbi->s_vhdr; 419 420 /* Copy parts of the volume header into the superblock */ 421 sb->s_magic = HFSPLUS_VOLHEAD_SIG; 422 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION || 423 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) { 424 pr_err("wrong filesystem version\n"); 425 goto out_free_vhdr; 426 } 427 sbi->total_blocks = be32_to_cpu(vhdr->total_blocks); 428 sbi->free_blocks = be32_to_cpu(vhdr->free_blocks); 429 sbi->next_cnid = be32_to_cpu(vhdr->next_cnid); 430 sbi->file_count = be32_to_cpu(vhdr->file_count); 431 sbi->folder_count = be32_to_cpu(vhdr->folder_count); 432 sbi->data_clump_blocks = 433 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift; 434 if (!sbi->data_clump_blocks) 435 sbi->data_clump_blocks = 1; 436 sbi->rsrc_clump_blocks = 437 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift; 438 if (!sbi->rsrc_clump_blocks) 439 sbi->rsrc_clump_blocks = 1; 440 441 err = -EFBIG; 442 last_fs_block = sbi->total_blocks - 1; 443 last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >> 444 PAGE_SHIFT; 445 446 if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) || 447 (last_fs_page > (pgoff_t)(~0ULL))) { 448 pr_err("filesystem size too large\n"); 449 goto out_free_vhdr; 450 } 451 452 /* Set up operations so we can load metadata */ 453 sb->s_op = &hfsplus_sops; 454 sb->s_maxbytes = MAX_LFS_FILESIZE; 455 456 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 457 pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. mounting read-only.\n"); 458 sb->s_flags |= SB_RDONLY; 459 } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) { 460 /* nothing */ 461 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 462 pr_warn("Filesystem is marked locked, mounting read-only.\n"); 463 sb->s_flags |= SB_RDONLY; 464 } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && 465 !sb_rdonly(sb)) { 466 pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, mounting read-only.\n"); 467 sb->s_flags |= SB_RDONLY; 468 } 469 470 err = -EINVAL; 471 472 /* Load metadata objects (B*Trees) */ 473 sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID); 474 if (!sbi->ext_tree) { 475 pr_err("failed to load extents file\n"); 476 goto out_free_vhdr; 477 } 478 sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID); 479 if (!sbi->cat_tree) { 480 pr_err("failed to load catalog file\n"); 481 goto out_close_ext_tree; 482 } 483 atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE); 484 if (vhdr->attr_file.total_blocks != 0) { 485 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID); 486 if (!sbi->attr_tree) { 487 pr_err("failed to load attributes file\n"); 488 goto out_close_cat_tree; 489 } 490 atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE); 491 } 492 sb->s_xattr = hfsplus_xattr_handlers; 493 494 inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID); 495 if (IS_ERR(inode)) { 496 pr_err("failed to load allocation file\n"); 497 err = PTR_ERR(inode); 498 goto out_close_attr_tree; 499 } 500 sbi->alloc_file = inode; 501 502 /* Load the root directory */ 503 root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID); 504 if (IS_ERR(root)) { 505 pr_err("failed to load root directory\n"); 506 err = PTR_ERR(root); 507 goto out_put_alloc_file; 508 } 509 510 sb->s_d_op = &hfsplus_dentry_operations; 511 sb->s_root = d_make_root(root); 512 if (!sb->s_root) { 513 err = -ENOMEM; 514 goto out_put_alloc_file; 515 } 516 517 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1; 518 str.name = HFSP_HIDDENDIR_NAME; 519 err = hfs_find_init(sbi->cat_tree, &fd); 520 if (err) 521 goto out_put_root; 522 err = hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str); 523 if (unlikely(err < 0)) 524 goto out_put_root; 525 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) { 526 hfs_find_exit(&fd); 527 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) { 528 err = -EINVAL; 529 goto out_put_root; 530 } 531 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id)); 532 if (IS_ERR(inode)) { 533 err = PTR_ERR(inode); 534 goto out_put_root; 535 } 536 sbi->hidden_dir = inode; 537 } else 538 hfs_find_exit(&fd); 539 540 if (!sb_rdonly(sb)) { 541 /* 542 * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused 543 * all three are registered with Apple for our use 544 */ 545 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION); 546 vhdr->modify_date = hfsp_now2mt(); 547 be32_add_cpu(&vhdr->write_count, 1); 548 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT); 549 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT); 550 hfsplus_sync_fs(sb, 1); 551 552 if (!sbi->hidden_dir) { 553 mutex_lock(&sbi->vh_mutex); 554 sbi->hidden_dir = hfsplus_new_inode(sb, root, S_IFDIR); 555 if (!sbi->hidden_dir) { 556 mutex_unlock(&sbi->vh_mutex); 557 err = -ENOMEM; 558 goto out_put_root; 559 } 560 err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root, 561 &str, sbi->hidden_dir); 562 if (err) { 563 mutex_unlock(&sbi->vh_mutex); 564 goto out_put_hidden_dir; 565 } 566 567 err = hfsplus_init_security(sbi->hidden_dir, 568 root, &str); 569 if (err == -EOPNOTSUPP) 570 err = 0; /* Operation is not supported. */ 571 else if (err) { 572 /* 573 * Try to delete anyway without 574 * error analysis. 575 */ 576 hfsplus_delete_cat(sbi->hidden_dir->i_ino, 577 root, &str); 578 mutex_unlock(&sbi->vh_mutex); 579 goto out_put_hidden_dir; 580 } 581 582 mutex_unlock(&sbi->vh_mutex); 583 hfsplus_mark_inode_dirty(sbi->hidden_dir, 584 HFSPLUS_I_CAT_DIRTY); 585 } 586 } 587 588 unload_nls(sbi->nls); 589 sbi->nls = nls; 590 return 0; 591 592 out_put_hidden_dir: 593 cancel_delayed_work_sync(&sbi->sync_work); 594 iput(sbi->hidden_dir); 595 out_put_root: 596 dput(sb->s_root); 597 sb->s_root = NULL; 598 out_put_alloc_file: 599 iput(sbi->alloc_file); 600 out_close_attr_tree: 601 hfs_btree_close(sbi->attr_tree); 602 out_close_cat_tree: 603 hfs_btree_close(sbi->cat_tree); 604 out_close_ext_tree: 605 hfs_btree_close(sbi->ext_tree); 606 out_free_vhdr: 607 kfree(sbi->s_vhdr_buf); 608 kfree(sbi->s_backup_vhdr_buf); 609 out_unload_nls: 610 unload_nls(sbi->nls); 611 unload_nls(nls); 612 kfree(sbi); 613 out: 614 return err; 615 } 616 617 MODULE_AUTHOR("Brad Boyer"); 618 MODULE_DESCRIPTION("Extended Macintosh Filesystem"); 619 MODULE_LICENSE("GPL"); 620 621 static struct kmem_cache *hfsplus_inode_cachep; 622 623 static struct inode *hfsplus_alloc_inode(struct super_block *sb) 624 { 625 struct hfsplus_inode_info *i; 626 627 i = alloc_inode_sb(sb, hfsplus_inode_cachep, GFP_KERNEL); 628 return i ? &i->vfs_inode : NULL; 629 } 630 631 static void hfsplus_free_inode(struct inode *inode) 632 { 633 kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode)); 634 } 635 636 #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info) 637 638 static struct dentry *hfsplus_mount(struct file_system_type *fs_type, 639 int flags, const char *dev_name, void *data) 640 { 641 return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super); 642 } 643 644 static struct file_system_type hfsplus_fs_type = { 645 .owner = THIS_MODULE, 646 .name = "hfsplus", 647 .mount = hfsplus_mount, 648 .kill_sb = kill_block_super, 649 .fs_flags = FS_REQUIRES_DEV, 650 }; 651 MODULE_ALIAS_FS("hfsplus"); 652 653 static void hfsplus_init_once(void *p) 654 { 655 struct hfsplus_inode_info *i = p; 656 657 inode_init_once(&i->vfs_inode); 658 } 659 660 static int __init init_hfsplus_fs(void) 661 { 662 int err; 663 664 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache", 665 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, 666 hfsplus_init_once); 667 if (!hfsplus_inode_cachep) 668 return -ENOMEM; 669 err = hfsplus_create_attr_tree_cache(); 670 if (err) 671 goto destroy_inode_cache; 672 err = register_filesystem(&hfsplus_fs_type); 673 if (err) 674 goto destroy_attr_tree_cache; 675 return 0; 676 677 destroy_attr_tree_cache: 678 hfsplus_destroy_attr_tree_cache(); 679 680 destroy_inode_cache: 681 kmem_cache_destroy(hfsplus_inode_cachep); 682 683 return err; 684 } 685 686 static void __exit exit_hfsplus_fs(void) 687 { 688 unregister_filesystem(&hfsplus_fs_type); 689 690 /* 691 * Make sure all delayed rcu free inodes are flushed before we 692 * destroy cache. 693 */ 694 rcu_barrier(); 695 hfsplus_destroy_attr_tree_cache(); 696 kmem_cache_destroy(hfsplus_inode_cachep); 697 } 698 699 module_init(init_hfsplus_fs) 700 module_exit(exit_hfsplus_fs) 701