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/fs_context.h> 18 #include <linux/slab.h> 19 #include <linux/vfs.h> 20 #include <linux/nls.h> 21 22 static struct inode *hfsplus_alloc_inode(struct super_block *sb); 23 static void hfsplus_free_inode(struct inode *inode); 24 25 #include "hfsplus_fs.h" 26 #include "xattr.h" 27 28 static int hfsplus_system_read_inode(struct inode *inode) 29 { 30 struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr; 31 32 switch (inode->i_ino) { 33 case HFSPLUS_EXT_CNID: 34 hfsplus_inode_read_fork(inode, &vhdr->ext_file); 35 inode->i_mapping->a_ops = &hfsplus_btree_aops; 36 break; 37 case HFSPLUS_CAT_CNID: 38 hfsplus_inode_read_fork(inode, &vhdr->cat_file); 39 inode->i_mapping->a_ops = &hfsplus_btree_aops; 40 break; 41 case HFSPLUS_ALLOC_CNID: 42 hfsplus_inode_read_fork(inode, &vhdr->alloc_file); 43 inode->i_mapping->a_ops = &hfsplus_aops; 44 break; 45 case HFSPLUS_START_CNID: 46 hfsplus_inode_read_fork(inode, &vhdr->start_file); 47 break; 48 case HFSPLUS_ATTR_CNID: 49 hfsplus_inode_read_fork(inode, &vhdr->attr_file); 50 inode->i_mapping->a_ops = &hfsplus_btree_aops; 51 break; 52 default: 53 return -EIO; 54 } 55 56 /* 57 * Assign a dummy file type, for may_open() requires that 58 * an inode has a valid file type. 59 */ 60 inode->i_mode = S_IFREG; 61 62 return 0; 63 } 64 65 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino) 66 { 67 struct hfs_find_data fd; 68 struct inode *inode; 69 int err; 70 71 inode = iget_locked(sb, ino); 72 if (!inode) 73 return ERR_PTR(-ENOMEM); 74 if (!(inode_state_read_once(inode) & I_NEW)) 75 return inode; 76 77 atomic_set(&HFSPLUS_I(inode)->opencnt, 0); 78 HFSPLUS_I(inode)->first_blocks = 0; 79 HFSPLUS_I(inode)->clump_blocks = 0; 80 HFSPLUS_I(inode)->alloc_blocks = 0; 81 HFSPLUS_I(inode)->cached_start = U32_MAX; 82 HFSPLUS_I(inode)->cached_blocks = 0; 83 memset(HFSPLUS_I(inode)->first_extents, 0, sizeof(hfsplus_extent_rec)); 84 memset(HFSPLUS_I(inode)->cached_extents, 0, sizeof(hfsplus_extent_rec)); 85 HFSPLUS_I(inode)->extent_state = 0; 86 mutex_init(&HFSPLUS_I(inode)->extents_lock); 87 HFSPLUS_I(inode)->rsrc_inode = NULL; 88 HFSPLUS_I(inode)->create_date = 0; 89 HFSPLUS_I(inode)->linkid = 0; 90 HFSPLUS_I(inode)->flags = 0; 91 HFSPLUS_I(inode)->fs_blocks = 0; 92 HFSPLUS_I(inode)->userflags = 0; 93 HFSPLUS_I(inode)->subfolders = 0; 94 HFSPLUS_I(inode)->phys_size = 0; 95 96 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || 97 inode->i_ino == HFSPLUS_ROOT_CNID) { 98 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); 99 if (!err) { 100 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); 101 if (!err) 102 err = hfsplus_cat_read_inode(inode, &fd); 103 hfs_find_exit(&fd); 104 } 105 } else { 106 err = hfsplus_system_read_inode(inode); 107 } 108 109 if (err) { 110 iget_failed(inode); 111 return ERR_PTR(err); 112 } 113 114 unlock_new_inode(inode); 115 return inode; 116 } 117 118 static int hfsplus_system_write_inode(struct inode *inode) 119 { 120 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); 121 struct hfsplus_vh *vhdr = sbi->s_vhdr; 122 struct hfsplus_fork_raw *fork; 123 struct hfs_btree *tree = NULL; 124 125 switch (inode->i_ino) { 126 case HFSPLUS_EXT_CNID: 127 fork = &vhdr->ext_file; 128 tree = sbi->ext_tree; 129 break; 130 case HFSPLUS_CAT_CNID: 131 fork = &vhdr->cat_file; 132 tree = sbi->cat_tree; 133 break; 134 case HFSPLUS_ALLOC_CNID: 135 fork = &vhdr->alloc_file; 136 break; 137 case HFSPLUS_START_CNID: 138 fork = &vhdr->start_file; 139 break; 140 case HFSPLUS_ATTR_CNID: 141 fork = &vhdr->attr_file; 142 tree = sbi->attr_tree; 143 break; 144 default: 145 return -EIO; 146 } 147 148 if (fork->total_size != cpu_to_be64(inode->i_size)) { 149 set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags); 150 hfsplus_mark_mdb_dirty(inode->i_sb); 151 } 152 hfsplus_inode_write_fork(inode, fork); 153 if (tree) { 154 mutex_lock_nested(&tree->tree_lock, 155 hfsplus_btree_lock_class(tree)); 156 int err = hfs_btree_write(tree); 157 mutex_unlock(&tree->tree_lock); 158 159 if (err) { 160 pr_err("b-tree write err: %d, ino %llu\n", 161 err, inode->i_ino); 162 return err; 163 } 164 } 165 return 0; 166 } 167 168 static int hfsplus_write_inode(struct inode *inode, 169 struct writeback_control *wbc) 170 { 171 int err; 172 173 hfs_dbg("ino %llu\n", inode->i_ino); 174 175 err = hfsplus_ext_write_extent(inode); 176 if (err) 177 return err; 178 179 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || 180 inode->i_ino == HFSPLUS_ROOT_CNID) 181 return hfsplus_cat_write_inode(inode); 182 else 183 return hfsplus_system_write_inode(inode); 184 } 185 186 static void hfsplus_evict_inode(struct inode *inode) 187 { 188 hfs_dbg("ino %llu\n", inode->i_ino); 189 truncate_inode_pages_final(&inode->i_data); 190 clear_inode(inode); 191 if (HFSPLUS_IS_RSRC(inode)) { 192 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL; 193 iput(HFSPLUS_I(inode)->rsrc_inode); 194 } 195 } 196 197 int hfsplus_commit_superblock(struct super_block *sb) 198 { 199 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 200 struct hfsplus_vh *vhdr = sbi->s_vhdr; 201 int write_backup = 0; 202 int error = 0, error2; 203 204 hfs_dbg("starting...\n"); 205 206 mutex_lock(&sbi->vh_mutex); 207 mutex_lock(&sbi->alloc_mutex); 208 vhdr->free_blocks = cpu_to_be32(sbi->free_blocks); 209 vhdr->next_cnid = cpu_to_be32(sbi->next_cnid); 210 vhdr->folder_count = cpu_to_be32(sbi->folder_count); 211 vhdr->file_count = cpu_to_be32(sbi->file_count); 212 213 hfs_dbg("free_blocks %u, next_cnid %u, folder_count %u, file_count %u\n", 214 sbi->free_blocks, sbi->next_cnid, 215 sbi->folder_count, 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 if (!error) 226 error = error2; 227 if (!write_backup) 228 goto out; 229 230 error2 = hfsplus_submit_bio(sb, 231 sbi->part_start + sbi->sect_count - 2, 232 sbi->s_backup_vhdr_buf, NULL, REQ_OP_WRITE); 233 if (!error) 234 error = error2; 235 out: 236 mutex_unlock(&sbi->alloc_mutex); 237 mutex_unlock(&sbi->vh_mutex); 238 239 hfs_dbg("finished: err %d\n", error); 240 241 return error; 242 } 243 244 static int hfsplus_sync_fs(struct super_block *sb, int wait) 245 { 246 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 247 int error, error2; 248 249 if (!wait) 250 return 0; 251 252 hfs_dbg("starting...\n"); 253 254 /* 255 * Explicitly write out the special metadata inodes. 256 * 257 * While these special inodes are marked as hashed and written 258 * out peridocically by the flusher threads we redirty them 259 * during writeout of normal inodes, and thus the life lock 260 * prevents us from getting the latest state to disk. 261 */ 262 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping); 263 error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping); 264 if (!error) 265 error = error2; 266 if (sbi->attr_tree) { 267 error2 = 268 filemap_write_and_wait(sbi->attr_tree->inode->i_mapping); 269 if (!error) 270 error = error2; 271 } 272 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping); 273 if (!error) 274 error = error2; 275 276 error2 = hfsplus_commit_superblock(sb); 277 if (!error) 278 error = error2; 279 280 if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags)) 281 blkdev_issue_flush(sb->s_bdev); 282 283 hfs_dbg("finished: err %d\n", error); 284 285 return error; 286 } 287 288 static void delayed_sync_fs(struct work_struct *work) 289 { 290 int err; 291 struct hfsplus_sb_info *sbi; 292 293 sbi = container_of(work, struct hfsplus_sb_info, sync_work.work); 294 295 spin_lock(&sbi->work_lock); 296 sbi->work_queued = 0; 297 spin_unlock(&sbi->work_lock); 298 299 err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1); 300 if (err) 301 pr_err("delayed sync fs err %d\n", err); 302 } 303 304 void hfsplus_mark_mdb_dirty(struct super_block *sb) 305 { 306 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 307 unsigned long delay; 308 309 if (sb_rdonly(sb)) 310 return; 311 312 spin_lock(&sbi->work_lock); 313 if (!sbi->work_queued) { 314 delay = msecs_to_jiffies(dirty_writeback_interval * 10); 315 queue_delayed_work(system_long_wq, &sbi->sync_work, delay); 316 sbi->work_queued = 1; 317 } 318 spin_unlock(&sbi->work_lock); 319 } 320 321 static void delayed_free(struct rcu_head *p) 322 { 323 struct hfsplus_sb_info *sbi = container_of(p, struct hfsplus_sb_info, rcu); 324 325 unload_nls(sbi->nls); 326 kfree(sbi); 327 } 328 329 static void hfsplus_put_super(struct super_block *sb) 330 { 331 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 332 333 hfs_dbg("starting...\n"); 334 335 cancel_delayed_work_sync(&sbi->sync_work); 336 337 if (!sb_rdonly(sb) && sbi->s_vhdr) { 338 struct hfsplus_vh *vhdr = sbi->s_vhdr; 339 340 vhdr->modify_date = hfsp_now2mt(); 341 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT); 342 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT); 343 344 hfsplus_sync_fs(sb, 1); 345 } 346 347 iput(sbi->alloc_file); 348 iput(sbi->hidden_dir); 349 hfs_btree_close(sbi->attr_tree); 350 hfs_btree_close(sbi->cat_tree); 351 hfs_btree_close(sbi->ext_tree); 352 kfree(sbi->s_vhdr_buf); 353 kfree(sbi->s_backup_vhdr_buf); 354 hfs_dbg("finished\n"); 355 } 356 357 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf) 358 { 359 struct super_block *sb = dentry->d_sb; 360 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 361 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 362 363 buf->f_type = HFSPLUS_SUPER_MAGIC; 364 buf->f_bsize = sb->s_blocksize; 365 buf->f_blocks = sbi->total_blocks << sbi->fs_shift; 366 buf->f_bfree = sbi->free_blocks << sbi->fs_shift; 367 buf->f_bavail = buf->f_bfree; 368 buf->f_files = 0xFFFFFFFF; 369 buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid; 370 buf->f_fsid = u64_to_fsid(id); 371 buf->f_namelen = HFSPLUS_MAX_STRLEN; 372 373 return 0; 374 } 375 376 static int hfsplus_reconfigure(struct fs_context *fc) 377 { 378 struct super_block *sb = fc->root->d_sb; 379 380 sync_filesystem(sb); 381 if ((bool)(fc->sb_flags & SB_RDONLY) == sb_rdonly(sb)) 382 return 0; 383 if (!(fc->sb_flags & SB_RDONLY)) { 384 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 385 struct hfsplus_vh *vhdr = sbi->s_vhdr; 386 387 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 388 pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. leaving read-only.\n"); 389 sb->s_flags |= SB_RDONLY; 390 fc->sb_flags |= SB_RDONLY; 391 } else if (test_bit(HFSPLUS_SB_FORCE, &sbi->flags)) { 392 /* nothing */ 393 } else if (vhdr->attributes & 394 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 395 pr_warn("filesystem is marked locked, leaving read-only.\n"); 396 sb->s_flags |= SB_RDONLY; 397 fc->sb_flags |= SB_RDONLY; 398 } else if (vhdr->attributes & 399 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) { 400 pr_warn("filesystem is marked journaled, leaving read-only.\n"); 401 sb->s_flags |= SB_RDONLY; 402 fc->sb_flags |= SB_RDONLY; 403 } 404 } 405 return 0; 406 } 407 408 static const struct super_operations hfsplus_sops = { 409 .alloc_inode = hfsplus_alloc_inode, 410 .free_inode = hfsplus_free_inode, 411 .write_inode = hfsplus_write_inode, 412 .evict_inode = hfsplus_evict_inode, 413 .put_super = hfsplus_put_super, 414 .sync_fs = hfsplus_sync_fs, 415 .statfs = hfsplus_statfs, 416 .show_options = hfsplus_show_options, 417 }; 418 419 void hfsplus_prepare_volume_header_for_commit(struct hfsplus_vh *vhdr) 420 { 421 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION); 422 vhdr->modify_date = hfsp_now2mt(); 423 be32_add_cpu(&vhdr->write_count, 1); 424 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT); 425 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT); 426 } 427 428 static inline int hfsplus_get_hidden_dir_entry(struct super_block *sb, 429 const struct qstr *str, 430 hfsplus_cat_entry *entry) 431 { 432 struct hfs_find_data fd; 433 int err; 434 435 err = hfs_find_init(HFSPLUS_SB(sb)->cat_tree, &fd); 436 if (unlikely(err)) 437 return err; 438 439 err = hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, str); 440 if (unlikely(err)) 441 goto free_fd; 442 443 err = hfsplus_brec_read_cat(&fd, entry); 444 if (err) 445 err = -ENOENT; 446 447 free_fd: 448 hfs_find_exit(&fd); 449 return err; 450 } 451 452 static int hfsplus_fill_super(struct super_block *sb, struct fs_context *fc) 453 { 454 struct hfsplus_vh *vhdr; 455 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 456 hfsplus_cat_entry entry; 457 struct inode *root, *inode; 458 struct qstr str; 459 struct nls_table *nls; 460 u64 last_fs_block, last_fs_page; 461 int silent = fc->sb_flags & SB_SILENT; 462 int err; 463 464 mutex_init(&sbi->alloc_mutex); 465 mutex_init(&sbi->vh_mutex); 466 spin_lock_init(&sbi->work_lock); 467 INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs); 468 469 err = -EINVAL; 470 if (!sbi->nls) { 471 /* try utf8 first, as this is the old default behaviour */ 472 sbi->nls = load_nls("utf8"); 473 if (!sbi->nls) 474 sbi->nls = load_nls_default(); 475 } 476 477 /* temporarily use utf8 to correctly find the hidden dir below */ 478 nls = sbi->nls; 479 sbi->nls = load_nls("utf8"); 480 if (!sbi->nls) { 481 pr_err("unable to load nls for utf8\n"); 482 goto out_unload_nls; 483 } 484 485 /* Grab the volume header */ 486 if (hfsplus_read_wrapper(sb)) { 487 if (!silent) 488 pr_warn("unable to find HFS+ superblock\n"); 489 goto out_unload_nls; 490 } 491 vhdr = sbi->s_vhdr; 492 493 /* Copy parts of the volume header into the superblock */ 494 sb->s_magic = HFSPLUS_VOLHEAD_SIG; 495 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION || 496 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) { 497 pr_err("wrong filesystem version\n"); 498 goto out_free_vhdr; 499 } 500 sbi->total_blocks = be32_to_cpu(vhdr->total_blocks); 501 sbi->free_blocks = be32_to_cpu(vhdr->free_blocks); 502 sbi->next_cnid = be32_to_cpu(vhdr->next_cnid); 503 sbi->file_count = be32_to_cpu(vhdr->file_count); 504 sbi->folder_count = be32_to_cpu(vhdr->folder_count); 505 sbi->data_clump_blocks = 506 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift; 507 if (!sbi->data_clump_blocks) 508 sbi->data_clump_blocks = 1; 509 sbi->rsrc_clump_blocks = 510 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift; 511 if (!sbi->rsrc_clump_blocks) 512 sbi->rsrc_clump_blocks = 1; 513 514 err = -EFBIG; 515 last_fs_block = sbi->total_blocks - 1; 516 last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >> 517 PAGE_SHIFT; 518 519 if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) || 520 (last_fs_page > (pgoff_t)(~0ULL))) { 521 pr_err("filesystem size too large\n"); 522 goto out_free_vhdr; 523 } 524 525 /* Set up operations so we can load metadata */ 526 sb->s_op = &hfsplus_sops; 527 sb->s_maxbytes = MAX_LFS_FILESIZE; 528 529 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 530 pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. mounting read-only.\n"); 531 sb->s_flags |= SB_RDONLY; 532 } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) { 533 /* nothing */ 534 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 535 pr_warn("Filesystem is marked locked, mounting read-only.\n"); 536 sb->s_flags |= SB_RDONLY; 537 } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && 538 !sb_rdonly(sb)) { 539 pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, mounting read-only.\n"); 540 sb->s_flags |= SB_RDONLY; 541 } 542 543 err = -EINVAL; 544 545 /* Load metadata objects (B*Trees) */ 546 sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID); 547 if (!sbi->ext_tree) { 548 pr_err("failed to load extents file\n"); 549 goto out_free_vhdr; 550 } 551 sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID); 552 if (!sbi->cat_tree) { 553 pr_err("failed to load catalog file\n"); 554 goto out_close_ext_tree; 555 } 556 atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE); 557 if (vhdr->attr_file.total_blocks != 0) { 558 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID); 559 if (!sbi->attr_tree) { 560 pr_err("failed to load attributes file\n"); 561 goto out_close_cat_tree; 562 } 563 atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE); 564 } 565 sb->s_xattr = hfsplus_xattr_handlers; 566 567 inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID); 568 if (IS_ERR(inode)) { 569 pr_err("failed to load allocation file\n"); 570 err = PTR_ERR(inode); 571 goto out_close_attr_tree; 572 } 573 sbi->alloc_file = inode; 574 575 /* Load the root directory */ 576 root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID); 577 if (IS_ERR(root)) { 578 pr_err("failed to load root directory\n"); 579 err = PTR_ERR(root); 580 goto out_put_alloc_file; 581 } 582 583 set_default_d_op(sb, &hfsplus_dentry_operations); 584 sb->s_root = d_make_root(root); 585 if (!sb->s_root) { 586 err = -ENOMEM; 587 goto out_put_alloc_file; 588 } 589 590 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1; 591 str.name = HFSP_HIDDENDIR_NAME; 592 err = hfsplus_get_hidden_dir_entry(sb, &str, &entry); 593 if (err == -ENOENT) { 594 /* 595 * Hidden directory is absent or it cannot be read. 596 */ 597 } else if (unlikely(err)) { 598 goto out_put_root; 599 } else { 600 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) { 601 err = -EIO; 602 goto out_put_root; 603 } 604 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id)); 605 if (IS_ERR(inode)) { 606 err = PTR_ERR(inode); 607 goto out_put_root; 608 } 609 sbi->hidden_dir = inode; 610 } 611 612 if (!sb_rdonly(sb)) { 613 /* 614 * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused 615 * all three are registered with Apple for our use 616 */ 617 hfsplus_prepare_volume_header_for_commit(vhdr); 618 hfsplus_sync_fs(sb, 1); 619 620 if (!sbi->hidden_dir) { 621 mutex_lock(&sbi->vh_mutex); 622 sbi->hidden_dir = hfsplus_new_inode(sb, root, S_IFDIR); 623 if (!sbi->hidden_dir) { 624 mutex_unlock(&sbi->vh_mutex); 625 err = -ENOMEM; 626 goto out_put_root; 627 } 628 err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root, 629 &str, sbi->hidden_dir); 630 if (err) { 631 mutex_unlock(&sbi->vh_mutex); 632 goto out_put_hidden_dir; 633 } 634 635 err = hfsplus_init_security(sbi->hidden_dir, 636 root, &str); 637 if (err == -EOPNOTSUPP) 638 err = 0; /* Operation is not supported. */ 639 else if (err) { 640 /* 641 * Try to delete anyway without 642 * error analysis. 643 */ 644 hfsplus_delete_cat(sbi->hidden_dir->i_ino, 645 root, &str); 646 mutex_unlock(&sbi->vh_mutex); 647 goto out_put_hidden_dir; 648 } 649 650 mutex_unlock(&sbi->vh_mutex); 651 hfsplus_mark_inode_dirty(HFSPLUS_CAT_TREE_I(sb), 652 HFSPLUS_I_CAT_DIRTY); 653 hfsplus_mark_inode_dirty(sbi->hidden_dir, 654 HFSPLUS_I_CAT_DIRTY); 655 } 656 } 657 658 unload_nls(sbi->nls); 659 sbi->nls = nls; 660 return 0; 661 662 out_put_hidden_dir: 663 cancel_delayed_work_sync(&sbi->sync_work); 664 iput(sbi->hidden_dir); 665 out_put_root: 666 dput(sb->s_root); 667 sb->s_root = NULL; 668 out_put_alloc_file: 669 iput(sbi->alloc_file); 670 out_close_attr_tree: 671 hfs_btree_close(sbi->attr_tree); 672 out_close_cat_tree: 673 hfs_btree_close(sbi->cat_tree); 674 out_close_ext_tree: 675 hfs_btree_close(sbi->ext_tree); 676 out_free_vhdr: 677 kfree(sbi->s_vhdr_buf); 678 kfree(sbi->s_backup_vhdr_buf); 679 out_unload_nls: 680 unload_nls(nls); 681 return err; 682 } 683 684 MODULE_AUTHOR("Brad Boyer"); 685 MODULE_DESCRIPTION("Extended Macintosh Filesystem"); 686 MODULE_LICENSE("GPL"); 687 688 static struct kmem_cache *hfsplus_inode_cachep; 689 690 static struct inode *hfsplus_alloc_inode(struct super_block *sb) 691 { 692 struct hfsplus_inode_info *i; 693 694 i = alloc_inode_sb(sb, hfsplus_inode_cachep, GFP_KERNEL); 695 return i ? &i->vfs_inode : NULL; 696 } 697 698 static void hfsplus_free_inode(struct inode *inode) 699 { 700 kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode)); 701 } 702 703 #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info) 704 705 static int hfsplus_get_tree(struct fs_context *fc) 706 { 707 return get_tree_bdev(fc, hfsplus_fill_super); 708 } 709 710 static void hfsplus_free_fc(struct fs_context *fc) 711 { 712 kfree(fc->s_fs_info); 713 } 714 715 static const struct fs_context_operations hfsplus_context_ops = { 716 .parse_param = hfsplus_parse_param, 717 .get_tree = hfsplus_get_tree, 718 .reconfigure = hfsplus_reconfigure, 719 .free = hfsplus_free_fc, 720 }; 721 722 static int hfsplus_init_fs_context(struct fs_context *fc) 723 { 724 struct hfsplus_sb_info *sbi; 725 726 sbi = kzalloc_obj(struct hfsplus_sb_info); 727 if (!sbi) 728 return -ENOMEM; 729 730 if (fc->purpose != FS_CONTEXT_FOR_RECONFIGURE) 731 hfsplus_fill_defaults(sbi); 732 733 fc->s_fs_info = sbi; 734 fc->ops = &hfsplus_context_ops; 735 736 return 0; 737 } 738 739 static void hfsplus_kill_super(struct super_block *sb) 740 { 741 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 742 743 kill_block_super(sb); 744 call_rcu(&sbi->rcu, delayed_free); 745 } 746 747 static struct file_system_type hfsplus_fs_type = { 748 .owner = THIS_MODULE, 749 .name = "hfsplus", 750 .kill_sb = hfsplus_kill_super, 751 .fs_flags = FS_REQUIRES_DEV, 752 .init_fs_context = hfsplus_init_fs_context, 753 }; 754 MODULE_ALIAS_FS("hfsplus"); 755 756 static void hfsplus_init_once(void *p) 757 { 758 struct hfsplus_inode_info *i = p; 759 760 inode_init_once(&i->vfs_inode); 761 } 762 763 static int __init init_hfsplus_fs(void) 764 { 765 int err; 766 767 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache", 768 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, 769 hfsplus_init_once); 770 if (!hfsplus_inode_cachep) 771 return -ENOMEM; 772 err = hfsplus_create_attr_tree_cache(); 773 if (err) 774 goto destroy_inode_cache; 775 err = register_filesystem(&hfsplus_fs_type); 776 if (err) 777 goto destroy_attr_tree_cache; 778 return 0; 779 780 destroy_attr_tree_cache: 781 hfsplus_destroy_attr_tree_cache(); 782 783 destroy_inode_cache: 784 kmem_cache_destroy(hfsplus_inode_cachep); 785 786 return err; 787 } 788 789 static void __exit exit_hfsplus_fs(void) 790 { 791 unregister_filesystem(&hfsplus_fs_type); 792 793 /* 794 * Make sure all delayed rcu free inodes are flushed before we 795 * destroy cache. 796 */ 797 rcu_barrier(); 798 hfsplus_destroy_attr_tree_cache(); 799 kmem_cache_destroy(hfsplus_inode_cachep); 800 } 801 802 module_init(init_hfsplus_fs) 803 module_exit(exit_hfsplus_fs) 804