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 INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list); 95 spin_lock_init(&HFSPLUS_I(inode)->open_dir_lock); 96 HFSPLUS_I(inode)->phys_size = 0; 97 98 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || 99 inode->i_ino == HFSPLUS_ROOT_CNID) { 100 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); 101 if (!err) { 102 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); 103 if (!err) 104 err = hfsplus_cat_read_inode(inode, &fd); 105 hfs_find_exit(&fd); 106 } 107 } else { 108 err = hfsplus_system_read_inode(inode); 109 } 110 111 if (err) { 112 iget_failed(inode); 113 return ERR_PTR(err); 114 } 115 116 unlock_new_inode(inode); 117 return inode; 118 } 119 120 static int hfsplus_system_write_inode(struct inode *inode) 121 { 122 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); 123 struct hfsplus_vh *vhdr = sbi->s_vhdr; 124 struct hfsplus_fork_raw *fork; 125 struct hfs_btree *tree = NULL; 126 127 switch (inode->i_ino) { 128 case HFSPLUS_EXT_CNID: 129 fork = &vhdr->ext_file; 130 tree = sbi->ext_tree; 131 break; 132 case HFSPLUS_CAT_CNID: 133 fork = &vhdr->cat_file; 134 tree = sbi->cat_tree; 135 break; 136 case HFSPLUS_ALLOC_CNID: 137 fork = &vhdr->alloc_file; 138 break; 139 case HFSPLUS_START_CNID: 140 fork = &vhdr->start_file; 141 break; 142 case HFSPLUS_ATTR_CNID: 143 fork = &vhdr->attr_file; 144 tree = sbi->attr_tree; 145 break; 146 default: 147 return -EIO; 148 } 149 150 if (fork->total_size != cpu_to_be64(inode->i_size)) { 151 set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags); 152 hfsplus_mark_mdb_dirty(inode->i_sb); 153 } 154 hfsplus_inode_write_fork(inode, fork); 155 if (tree) { 156 int err = hfs_btree_write(tree); 157 158 if (err) { 159 pr_err("b-tree write err: %d, ino %lu\n", 160 err, inode->i_ino); 161 return err; 162 } 163 } 164 return 0; 165 } 166 167 static int hfsplus_write_inode(struct inode *inode, 168 struct writeback_control *wbc) 169 { 170 int err; 171 172 hfs_dbg("ino %lu\n", inode->i_ino); 173 174 err = hfsplus_ext_write_extent(inode); 175 if (err) 176 return err; 177 178 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || 179 inode->i_ino == HFSPLUS_ROOT_CNID) 180 return hfsplus_cat_write_inode(inode); 181 else 182 return hfsplus_system_write_inode(inode); 183 } 184 185 static void hfsplus_evict_inode(struct inode *inode) 186 { 187 hfs_dbg("ino %lu\n", inode->i_ino); 188 truncate_inode_pages_final(&inode->i_data); 189 clear_inode(inode); 190 if (HFSPLUS_IS_RSRC(inode)) { 191 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL; 192 iput(HFSPLUS_I(inode)->rsrc_inode); 193 } 194 } 195 196 int hfsplus_commit_superblock(struct super_block *sb) 197 { 198 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 199 struct hfsplus_vh *vhdr = sbi->s_vhdr; 200 int write_backup = 0; 201 int error = 0, error2; 202 203 hfs_dbg("starting...\n"); 204 205 mutex_lock(&sbi->vh_mutex); 206 mutex_lock(&sbi->alloc_mutex); 207 vhdr->free_blocks = cpu_to_be32(sbi->free_blocks); 208 vhdr->next_cnid = cpu_to_be32(sbi->next_cnid); 209 vhdr->folder_count = cpu_to_be32(sbi->folder_count); 210 vhdr->file_count = cpu_to_be32(sbi->file_count); 211 212 hfs_dbg("free_blocks %u, next_cnid %u, folder_count %u, file_count %u\n", 213 sbi->free_blocks, sbi->next_cnid, 214 sbi->folder_count, sbi->file_count); 215 216 if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) { 217 memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr)); 218 write_backup = 1; 219 } 220 221 error2 = hfsplus_submit_bio(sb, 222 sbi->part_start + HFSPLUS_VOLHEAD_SECTOR, 223 sbi->s_vhdr_buf, NULL, REQ_OP_WRITE); 224 if (!error) 225 error = error2; 226 if (!write_backup) 227 goto out; 228 229 error2 = hfsplus_submit_bio(sb, 230 sbi->part_start + sbi->sect_count - 2, 231 sbi->s_backup_vhdr_buf, NULL, REQ_OP_WRITE); 232 if (!error) 233 error = error2; 234 out: 235 mutex_unlock(&sbi->alloc_mutex); 236 mutex_unlock(&sbi->vh_mutex); 237 238 hfs_dbg("finished: err %d\n", error); 239 240 return error; 241 } 242 243 static int hfsplus_sync_fs(struct super_block *sb, int wait) 244 { 245 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 246 int error, error2; 247 248 if (!wait) 249 return 0; 250 251 hfs_dbg("starting...\n"); 252 253 /* 254 * Explicitly write out the special metadata inodes. 255 * 256 * While these special inodes are marked as hashed and written 257 * out peridocically by the flusher threads we redirty them 258 * during writeout of normal inodes, and thus the life lock 259 * prevents us from getting the latest state to disk. 260 */ 261 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping); 262 error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping); 263 if (!error) 264 error = error2; 265 if (sbi->attr_tree) { 266 error2 = 267 filemap_write_and_wait(sbi->attr_tree->inode->i_mapping); 268 if (!error) 269 error = error2; 270 } 271 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping); 272 if (!error) 273 error = error2; 274 275 error2 = hfsplus_commit_superblock(sb); 276 if (!error) 277 error = error2; 278 279 if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags)) 280 blkdev_issue_flush(sb->s_bdev); 281 282 hfs_dbg("finished: err %d\n", error); 283 284 return error; 285 } 286 287 static void delayed_sync_fs(struct work_struct *work) 288 { 289 int err; 290 struct hfsplus_sb_info *sbi; 291 292 sbi = container_of(work, struct hfsplus_sb_info, sync_work.work); 293 294 spin_lock(&sbi->work_lock); 295 sbi->work_queued = 0; 296 spin_unlock(&sbi->work_lock); 297 298 err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1); 299 if (err) 300 pr_err("delayed sync fs err %d\n", err); 301 } 302 303 void hfsplus_mark_mdb_dirty(struct super_block *sb) 304 { 305 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 306 unsigned long delay; 307 308 if (sb_rdonly(sb)) 309 return; 310 311 spin_lock(&sbi->work_lock); 312 if (!sbi->work_queued) { 313 delay = msecs_to_jiffies(dirty_writeback_interval * 10); 314 queue_delayed_work(system_long_wq, &sbi->sync_work, delay); 315 sbi->work_queued = 1; 316 } 317 spin_unlock(&sbi->work_lock); 318 } 319 320 static void delayed_free(struct rcu_head *p) 321 { 322 struct hfsplus_sb_info *sbi = container_of(p, struct hfsplus_sb_info, rcu); 323 324 unload_nls(sbi->nls); 325 kfree(sbi); 326 } 327 328 static void hfsplus_put_super(struct super_block *sb) 329 { 330 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 331 332 hfs_dbg("starting...\n"); 333 334 cancel_delayed_work_sync(&sbi->sync_work); 335 336 if (!sb_rdonly(sb) && sbi->s_vhdr) { 337 struct hfsplus_vh *vhdr = sbi->s_vhdr; 338 339 vhdr->modify_date = hfsp_now2mt(); 340 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT); 341 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT); 342 343 hfsplus_sync_fs(sb, 1); 344 } 345 346 iput(sbi->alloc_file); 347 iput(sbi->hidden_dir); 348 hfs_btree_close(sbi->attr_tree); 349 hfs_btree_close(sbi->cat_tree); 350 hfs_btree_close(sbi->ext_tree); 351 kfree(sbi->s_vhdr_buf); 352 kfree(sbi->s_backup_vhdr_buf); 353 hfs_dbg("finished\n"); 354 } 355 356 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf) 357 { 358 struct super_block *sb = dentry->d_sb; 359 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 360 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 361 362 buf->f_type = HFSPLUS_SUPER_MAGIC; 363 buf->f_bsize = sb->s_blocksize; 364 buf->f_blocks = sbi->total_blocks << sbi->fs_shift; 365 buf->f_bfree = sbi->free_blocks << sbi->fs_shift; 366 buf->f_bavail = buf->f_bfree; 367 buf->f_files = 0xFFFFFFFF; 368 buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid; 369 buf->f_fsid = u64_to_fsid(id); 370 buf->f_namelen = HFSPLUS_MAX_STRLEN; 371 372 return 0; 373 } 374 375 static int hfsplus_reconfigure(struct fs_context *fc) 376 { 377 struct super_block *sb = fc->root->d_sb; 378 379 sync_filesystem(sb); 380 if ((bool)(fc->sb_flags & SB_RDONLY) == sb_rdonly(sb)) 381 return 0; 382 if (!(fc->sb_flags & SB_RDONLY)) { 383 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 384 struct hfsplus_vh *vhdr = sbi->s_vhdr; 385 386 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 387 pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. leaving read-only.\n"); 388 sb->s_flags |= SB_RDONLY; 389 fc->sb_flags |= SB_RDONLY; 390 } else if (test_bit(HFSPLUS_SB_FORCE, &sbi->flags)) { 391 /* nothing */ 392 } else if (vhdr->attributes & 393 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 394 pr_warn("filesystem is marked locked, leaving read-only.\n"); 395 sb->s_flags |= SB_RDONLY; 396 fc->sb_flags |= SB_RDONLY; 397 } else if (vhdr->attributes & 398 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) { 399 pr_warn("filesystem is marked journaled, leaving read-only.\n"); 400 sb->s_flags |= SB_RDONLY; 401 fc->sb_flags |= SB_RDONLY; 402 } 403 } 404 return 0; 405 } 406 407 static const struct super_operations hfsplus_sops = { 408 .alloc_inode = hfsplus_alloc_inode, 409 .free_inode = hfsplus_free_inode, 410 .write_inode = hfsplus_write_inode, 411 .evict_inode = hfsplus_evict_inode, 412 .put_super = hfsplus_put_super, 413 .sync_fs = hfsplus_sync_fs, 414 .statfs = hfsplus_statfs, 415 .show_options = hfsplus_show_options, 416 }; 417 418 void hfsplus_prepare_volume_header_for_commit(struct hfsplus_vh *vhdr) 419 { 420 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION); 421 vhdr->modify_date = hfsp_now2mt(); 422 be32_add_cpu(&vhdr->write_count, 1); 423 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT); 424 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT); 425 } 426 427 static int hfsplus_fill_super(struct super_block *sb, struct fs_context *fc) 428 { 429 struct hfsplus_vh *vhdr; 430 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 431 hfsplus_cat_entry entry; 432 struct hfs_find_data fd; 433 struct inode *root, *inode; 434 struct qstr str; 435 struct nls_table *nls; 436 u64 last_fs_block, last_fs_page; 437 int silent = fc->sb_flags & SB_SILENT; 438 int err; 439 440 mutex_init(&sbi->alloc_mutex); 441 mutex_init(&sbi->vh_mutex); 442 spin_lock_init(&sbi->work_lock); 443 INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs); 444 445 err = -EINVAL; 446 if (!sbi->nls) { 447 /* try utf8 first, as this is the old default behaviour */ 448 sbi->nls = load_nls("utf8"); 449 if (!sbi->nls) 450 sbi->nls = load_nls_default(); 451 } 452 453 /* temporarily use utf8 to correctly find the hidden dir below */ 454 nls = sbi->nls; 455 sbi->nls = load_nls("utf8"); 456 if (!sbi->nls) { 457 pr_err("unable to load nls for utf8\n"); 458 goto out_unload_nls; 459 } 460 461 /* Grab the volume header */ 462 if (hfsplus_read_wrapper(sb)) { 463 if (!silent) 464 pr_warn("unable to find HFS+ superblock\n"); 465 goto out_unload_nls; 466 } 467 vhdr = sbi->s_vhdr; 468 469 /* Copy parts of the volume header into the superblock */ 470 sb->s_magic = HFSPLUS_VOLHEAD_SIG; 471 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION || 472 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) { 473 pr_err("wrong filesystem version\n"); 474 goto out_free_vhdr; 475 } 476 sbi->total_blocks = be32_to_cpu(vhdr->total_blocks); 477 sbi->free_blocks = be32_to_cpu(vhdr->free_blocks); 478 sbi->next_cnid = be32_to_cpu(vhdr->next_cnid); 479 sbi->file_count = be32_to_cpu(vhdr->file_count); 480 sbi->folder_count = be32_to_cpu(vhdr->folder_count); 481 sbi->data_clump_blocks = 482 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift; 483 if (!sbi->data_clump_blocks) 484 sbi->data_clump_blocks = 1; 485 sbi->rsrc_clump_blocks = 486 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift; 487 if (!sbi->rsrc_clump_blocks) 488 sbi->rsrc_clump_blocks = 1; 489 490 err = -EFBIG; 491 last_fs_block = sbi->total_blocks - 1; 492 last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >> 493 PAGE_SHIFT; 494 495 if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) || 496 (last_fs_page > (pgoff_t)(~0ULL))) { 497 pr_err("filesystem size too large\n"); 498 goto out_free_vhdr; 499 } 500 501 /* Set up operations so we can load metadata */ 502 sb->s_op = &hfsplus_sops; 503 sb->s_maxbytes = MAX_LFS_FILESIZE; 504 505 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 506 pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. mounting read-only.\n"); 507 sb->s_flags |= SB_RDONLY; 508 } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) { 509 /* nothing */ 510 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 511 pr_warn("Filesystem is marked locked, mounting read-only.\n"); 512 sb->s_flags |= SB_RDONLY; 513 } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && 514 !sb_rdonly(sb)) { 515 pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, mounting read-only.\n"); 516 sb->s_flags |= SB_RDONLY; 517 } 518 519 err = -EINVAL; 520 521 /* Load metadata objects (B*Trees) */ 522 sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID); 523 if (!sbi->ext_tree) { 524 pr_err("failed to load extents file\n"); 525 goto out_free_vhdr; 526 } 527 sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID); 528 if (!sbi->cat_tree) { 529 pr_err("failed to load catalog file\n"); 530 goto out_close_ext_tree; 531 } 532 atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE); 533 if (vhdr->attr_file.total_blocks != 0) { 534 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID); 535 if (!sbi->attr_tree) { 536 pr_err("failed to load attributes file\n"); 537 goto out_close_cat_tree; 538 } 539 atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE); 540 } 541 sb->s_xattr = hfsplus_xattr_handlers; 542 543 inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID); 544 if (IS_ERR(inode)) { 545 pr_err("failed to load allocation file\n"); 546 err = PTR_ERR(inode); 547 goto out_close_attr_tree; 548 } 549 sbi->alloc_file = inode; 550 551 /* Load the root directory */ 552 root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID); 553 if (IS_ERR(root)) { 554 pr_err("failed to load root directory\n"); 555 err = PTR_ERR(root); 556 goto out_put_alloc_file; 557 } 558 559 set_default_d_op(sb, &hfsplus_dentry_operations); 560 sb->s_root = d_make_root(root); 561 if (!sb->s_root) { 562 err = -ENOMEM; 563 goto out_put_alloc_file; 564 } 565 566 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1; 567 str.name = HFSP_HIDDENDIR_NAME; 568 err = hfs_find_init(sbi->cat_tree, &fd); 569 if (err) 570 goto out_put_root; 571 err = hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str); 572 if (unlikely(err < 0)) 573 goto out_put_root; 574 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) { 575 hfs_find_exit(&fd); 576 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) { 577 err = -EIO; 578 goto out_put_root; 579 } 580 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id)); 581 if (IS_ERR(inode)) { 582 err = PTR_ERR(inode); 583 goto out_put_root; 584 } 585 sbi->hidden_dir = inode; 586 } else 587 hfs_find_exit(&fd); 588 589 if (!sb_rdonly(sb)) { 590 /* 591 * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused 592 * all three are registered with Apple for our use 593 */ 594 hfsplus_prepare_volume_header_for_commit(vhdr); 595 hfsplus_sync_fs(sb, 1); 596 597 if (!sbi->hidden_dir) { 598 mutex_lock(&sbi->vh_mutex); 599 sbi->hidden_dir = hfsplus_new_inode(sb, root, S_IFDIR); 600 if (!sbi->hidden_dir) { 601 mutex_unlock(&sbi->vh_mutex); 602 err = -ENOMEM; 603 goto out_put_root; 604 } 605 err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root, 606 &str, sbi->hidden_dir); 607 if (err) { 608 mutex_unlock(&sbi->vh_mutex); 609 goto out_put_hidden_dir; 610 } 611 612 err = hfsplus_init_security(sbi->hidden_dir, 613 root, &str); 614 if (err == -EOPNOTSUPP) 615 err = 0; /* Operation is not supported. */ 616 else if (err) { 617 /* 618 * Try to delete anyway without 619 * error analysis. 620 */ 621 hfsplus_delete_cat(sbi->hidden_dir->i_ino, 622 root, &str); 623 mutex_unlock(&sbi->vh_mutex); 624 goto out_put_hidden_dir; 625 } 626 627 mutex_unlock(&sbi->vh_mutex); 628 hfsplus_mark_inode_dirty(sbi->hidden_dir, 629 HFSPLUS_I_CAT_DIRTY); 630 } 631 } 632 633 unload_nls(sbi->nls); 634 sbi->nls = nls; 635 return 0; 636 637 out_put_hidden_dir: 638 cancel_delayed_work_sync(&sbi->sync_work); 639 iput(sbi->hidden_dir); 640 out_put_root: 641 dput(sb->s_root); 642 sb->s_root = NULL; 643 out_put_alloc_file: 644 iput(sbi->alloc_file); 645 out_close_attr_tree: 646 hfs_btree_close(sbi->attr_tree); 647 out_close_cat_tree: 648 hfs_btree_close(sbi->cat_tree); 649 out_close_ext_tree: 650 hfs_btree_close(sbi->ext_tree); 651 out_free_vhdr: 652 kfree(sbi->s_vhdr_buf); 653 kfree(sbi->s_backup_vhdr_buf); 654 out_unload_nls: 655 unload_nls(nls); 656 return err; 657 } 658 659 MODULE_AUTHOR("Brad Boyer"); 660 MODULE_DESCRIPTION("Extended Macintosh Filesystem"); 661 MODULE_LICENSE("GPL"); 662 663 static struct kmem_cache *hfsplus_inode_cachep; 664 665 static struct inode *hfsplus_alloc_inode(struct super_block *sb) 666 { 667 struct hfsplus_inode_info *i; 668 669 i = alloc_inode_sb(sb, hfsplus_inode_cachep, GFP_KERNEL); 670 return i ? &i->vfs_inode : NULL; 671 } 672 673 static void hfsplus_free_inode(struct inode *inode) 674 { 675 kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode)); 676 } 677 678 #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info) 679 680 static int hfsplus_get_tree(struct fs_context *fc) 681 { 682 return get_tree_bdev(fc, hfsplus_fill_super); 683 } 684 685 static void hfsplus_free_fc(struct fs_context *fc) 686 { 687 kfree(fc->s_fs_info); 688 } 689 690 static const struct fs_context_operations hfsplus_context_ops = { 691 .parse_param = hfsplus_parse_param, 692 .get_tree = hfsplus_get_tree, 693 .reconfigure = hfsplus_reconfigure, 694 .free = hfsplus_free_fc, 695 }; 696 697 static int hfsplus_init_fs_context(struct fs_context *fc) 698 { 699 struct hfsplus_sb_info *sbi; 700 701 sbi = kzalloc_obj(struct hfsplus_sb_info, GFP_KERNEL); 702 if (!sbi) 703 return -ENOMEM; 704 705 if (fc->purpose != FS_CONTEXT_FOR_RECONFIGURE) 706 hfsplus_fill_defaults(sbi); 707 708 fc->s_fs_info = sbi; 709 fc->ops = &hfsplus_context_ops; 710 711 return 0; 712 } 713 714 static void hfsplus_kill_super(struct super_block *sb) 715 { 716 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 717 718 kill_block_super(sb); 719 call_rcu(&sbi->rcu, delayed_free); 720 } 721 722 static struct file_system_type hfsplus_fs_type = { 723 .owner = THIS_MODULE, 724 .name = "hfsplus", 725 .kill_sb = hfsplus_kill_super, 726 .fs_flags = FS_REQUIRES_DEV, 727 .init_fs_context = hfsplus_init_fs_context, 728 }; 729 MODULE_ALIAS_FS("hfsplus"); 730 731 static void hfsplus_init_once(void *p) 732 { 733 struct hfsplus_inode_info *i = p; 734 735 inode_init_once(&i->vfs_inode); 736 } 737 738 static int __init init_hfsplus_fs(void) 739 { 740 int err; 741 742 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache", 743 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, 744 hfsplus_init_once); 745 if (!hfsplus_inode_cachep) 746 return -ENOMEM; 747 err = hfsplus_create_attr_tree_cache(); 748 if (err) 749 goto destroy_inode_cache; 750 err = register_filesystem(&hfsplus_fs_type); 751 if (err) 752 goto destroy_attr_tree_cache; 753 return 0; 754 755 destroy_attr_tree_cache: 756 hfsplus_destroy_attr_tree_cache(); 757 758 destroy_inode_cache: 759 kmem_cache_destroy(hfsplus_inode_cachep); 760 761 return err; 762 } 763 764 static void __exit exit_hfsplus_fs(void) 765 { 766 unregister_filesystem(&hfsplus_fs_type); 767 768 /* 769 * Make sure all delayed rcu free inodes are flushed before we 770 * destroy cache. 771 */ 772 rcu_barrier(); 773 hfsplus_destroy_attr_tree_cache(); 774 kmem_cache_destroy(hfsplus_inode_cachep); 775 } 776 777 module_init(init_hfsplus_fs) 778 module_exit(exit_hfsplus_fs) 779