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 return 0; 57 } 58 59 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino) 60 { 61 struct hfs_find_data fd; 62 struct inode *inode; 63 int err; 64 65 inode = iget_locked(sb, ino); 66 if (!inode) 67 return ERR_PTR(-ENOMEM); 68 if (!(inode->i_state & I_NEW)) 69 return inode; 70 71 INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list); 72 spin_lock_init(&HFSPLUS_I(inode)->open_dir_lock); 73 mutex_init(&HFSPLUS_I(inode)->extents_lock); 74 HFSPLUS_I(inode)->flags = 0; 75 HFSPLUS_I(inode)->extent_state = 0; 76 HFSPLUS_I(inode)->rsrc_inode = NULL; 77 atomic_set(&HFSPLUS_I(inode)->opencnt, 0); 78 79 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || 80 inode->i_ino == HFSPLUS_ROOT_CNID) { 81 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); 82 if (!err) { 83 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); 84 if (!err) 85 err = hfsplus_cat_read_inode(inode, &fd); 86 hfs_find_exit(&fd); 87 } 88 } else { 89 err = hfsplus_system_read_inode(inode); 90 } 91 92 if (err) { 93 iget_failed(inode); 94 return ERR_PTR(err); 95 } 96 97 unlock_new_inode(inode); 98 return inode; 99 } 100 101 static int hfsplus_system_write_inode(struct inode *inode) 102 { 103 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); 104 struct hfsplus_vh *vhdr = sbi->s_vhdr; 105 struct hfsplus_fork_raw *fork; 106 struct hfs_btree *tree = NULL; 107 108 switch (inode->i_ino) { 109 case HFSPLUS_EXT_CNID: 110 fork = &vhdr->ext_file; 111 tree = sbi->ext_tree; 112 break; 113 case HFSPLUS_CAT_CNID: 114 fork = &vhdr->cat_file; 115 tree = sbi->cat_tree; 116 break; 117 case HFSPLUS_ALLOC_CNID: 118 fork = &vhdr->alloc_file; 119 break; 120 case HFSPLUS_START_CNID: 121 fork = &vhdr->start_file; 122 break; 123 case HFSPLUS_ATTR_CNID: 124 fork = &vhdr->attr_file; 125 tree = sbi->attr_tree; 126 break; 127 default: 128 return -EIO; 129 } 130 131 if (fork->total_size != cpu_to_be64(inode->i_size)) { 132 set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags); 133 hfsplus_mark_mdb_dirty(inode->i_sb); 134 } 135 hfsplus_inode_write_fork(inode, fork); 136 if (tree) { 137 int err = hfs_btree_write(tree); 138 139 if (err) { 140 pr_err("b-tree write err: %d, ino %lu\n", 141 err, inode->i_ino); 142 return err; 143 } 144 } 145 return 0; 146 } 147 148 static int hfsplus_write_inode(struct inode *inode, 149 struct writeback_control *wbc) 150 { 151 int err; 152 153 hfs_dbg(INODE, "hfsplus_write_inode: %lu\n", inode->i_ino); 154 155 err = hfsplus_ext_write_extent(inode); 156 if (err) 157 return err; 158 159 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || 160 inode->i_ino == HFSPLUS_ROOT_CNID) 161 return hfsplus_cat_write_inode(inode); 162 else 163 return hfsplus_system_write_inode(inode); 164 } 165 166 static void hfsplus_evict_inode(struct inode *inode) 167 { 168 hfs_dbg(INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino); 169 truncate_inode_pages_final(&inode->i_data); 170 clear_inode(inode); 171 if (HFSPLUS_IS_RSRC(inode)) { 172 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL; 173 iput(HFSPLUS_I(inode)->rsrc_inode); 174 } 175 } 176 177 static int hfsplus_sync_fs(struct super_block *sb, int wait) 178 { 179 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 180 struct hfsplus_vh *vhdr = sbi->s_vhdr; 181 int write_backup = 0; 182 int error, error2; 183 184 if (!wait) 185 return 0; 186 187 hfs_dbg(SUPER, "hfsplus_sync_fs\n"); 188 189 /* 190 * Explicitly write out the special metadata inodes. 191 * 192 * While these special inodes are marked as hashed and written 193 * out peridocically by the flusher threads we redirty them 194 * during writeout of normal inodes, and thus the life lock 195 * prevents us from getting the latest state to disk. 196 */ 197 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping); 198 error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping); 199 if (!error) 200 error = error2; 201 if (sbi->attr_tree) { 202 error2 = 203 filemap_write_and_wait(sbi->attr_tree->inode->i_mapping); 204 if (!error) 205 error = error2; 206 } 207 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping); 208 if (!error) 209 error = error2; 210 211 mutex_lock(&sbi->vh_mutex); 212 mutex_lock(&sbi->alloc_mutex); 213 vhdr->free_blocks = cpu_to_be32(sbi->free_blocks); 214 vhdr->next_cnid = cpu_to_be32(sbi->next_cnid); 215 vhdr->folder_count = cpu_to_be32(sbi->folder_count); 216 vhdr->file_count = cpu_to_be32(sbi->file_count); 217 218 if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) { 219 memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr)); 220 write_backup = 1; 221 } 222 223 error2 = hfsplus_submit_bio(sb, 224 sbi->part_start + HFSPLUS_VOLHEAD_SECTOR, 225 sbi->s_vhdr_buf, NULL, REQ_OP_WRITE | 226 REQ_SYNC); 227 if (!error) 228 error = error2; 229 if (!write_backup) 230 goto out; 231 232 error2 = hfsplus_submit_bio(sb, 233 sbi->part_start + sbi->sect_count - 2, 234 sbi->s_backup_vhdr_buf, NULL, REQ_OP_WRITE | 235 REQ_SYNC); 236 if (!error) 237 error2 = error; 238 out: 239 mutex_unlock(&sbi->alloc_mutex); 240 mutex_unlock(&sbi->vh_mutex); 241 242 if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags)) 243 blkdev_issue_flush(sb->s_bdev); 244 245 return error; 246 } 247 248 static void delayed_sync_fs(struct work_struct *work) 249 { 250 int err; 251 struct hfsplus_sb_info *sbi; 252 253 sbi = container_of(work, struct hfsplus_sb_info, sync_work.work); 254 255 spin_lock(&sbi->work_lock); 256 sbi->work_queued = 0; 257 spin_unlock(&sbi->work_lock); 258 259 err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1); 260 if (err) 261 pr_err("delayed sync fs err %d\n", err); 262 } 263 264 void hfsplus_mark_mdb_dirty(struct super_block *sb) 265 { 266 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 267 unsigned long delay; 268 269 if (sb_rdonly(sb)) 270 return; 271 272 spin_lock(&sbi->work_lock); 273 if (!sbi->work_queued) { 274 delay = msecs_to_jiffies(dirty_writeback_interval * 10); 275 queue_delayed_work(system_long_wq, &sbi->sync_work, delay); 276 sbi->work_queued = 1; 277 } 278 spin_unlock(&sbi->work_lock); 279 } 280 281 static void delayed_free(struct rcu_head *p) 282 { 283 struct hfsplus_sb_info *sbi = container_of(p, struct hfsplus_sb_info, rcu); 284 285 unload_nls(sbi->nls); 286 kfree(sbi); 287 } 288 289 static void hfsplus_put_super(struct super_block *sb) 290 { 291 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 292 293 hfs_dbg(SUPER, "hfsplus_put_super\n"); 294 295 cancel_delayed_work_sync(&sbi->sync_work); 296 297 if (!sb_rdonly(sb) && sbi->s_vhdr) { 298 struct hfsplus_vh *vhdr = sbi->s_vhdr; 299 300 vhdr->modify_date = hfsp_now2mt(); 301 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT); 302 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT); 303 304 hfsplus_sync_fs(sb, 1); 305 } 306 307 iput(sbi->alloc_file); 308 iput(sbi->hidden_dir); 309 hfs_btree_close(sbi->attr_tree); 310 hfs_btree_close(sbi->cat_tree); 311 hfs_btree_close(sbi->ext_tree); 312 kfree(sbi->s_vhdr_buf); 313 kfree(sbi->s_backup_vhdr_buf); 314 call_rcu(&sbi->rcu, delayed_free); 315 } 316 317 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf) 318 { 319 struct super_block *sb = dentry->d_sb; 320 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 321 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 322 323 buf->f_type = HFSPLUS_SUPER_MAGIC; 324 buf->f_bsize = sb->s_blocksize; 325 buf->f_blocks = sbi->total_blocks << sbi->fs_shift; 326 buf->f_bfree = sbi->free_blocks << sbi->fs_shift; 327 buf->f_bavail = buf->f_bfree; 328 buf->f_files = 0xFFFFFFFF; 329 buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid; 330 buf->f_fsid = u64_to_fsid(id); 331 buf->f_namelen = HFSPLUS_MAX_STRLEN; 332 333 return 0; 334 } 335 336 static int hfsplus_reconfigure(struct fs_context *fc) 337 { 338 struct super_block *sb = fc->root->d_sb; 339 340 sync_filesystem(sb); 341 if ((bool)(fc->sb_flags & SB_RDONLY) == sb_rdonly(sb)) 342 return 0; 343 if (!(fc->sb_flags & SB_RDONLY)) { 344 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 345 struct hfsplus_vh *vhdr = sbi->s_vhdr; 346 347 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 348 pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. leaving read-only.\n"); 349 sb->s_flags |= SB_RDONLY; 350 fc->sb_flags |= SB_RDONLY; 351 } else if (test_bit(HFSPLUS_SB_FORCE, &sbi->flags)) { 352 /* nothing */ 353 } else if (vhdr->attributes & 354 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 355 pr_warn("filesystem is marked locked, leaving read-only.\n"); 356 sb->s_flags |= SB_RDONLY; 357 fc->sb_flags |= SB_RDONLY; 358 } else if (vhdr->attributes & 359 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) { 360 pr_warn("filesystem is marked journaled, leaving read-only.\n"); 361 sb->s_flags |= SB_RDONLY; 362 fc->sb_flags |= SB_RDONLY; 363 } 364 } 365 return 0; 366 } 367 368 static const struct super_operations hfsplus_sops = { 369 .alloc_inode = hfsplus_alloc_inode, 370 .free_inode = hfsplus_free_inode, 371 .write_inode = hfsplus_write_inode, 372 .evict_inode = hfsplus_evict_inode, 373 .put_super = hfsplus_put_super, 374 .sync_fs = hfsplus_sync_fs, 375 .statfs = hfsplus_statfs, 376 .show_options = hfsplus_show_options, 377 }; 378 379 static int hfsplus_fill_super(struct super_block *sb, struct fs_context *fc) 380 { 381 struct hfsplus_vh *vhdr; 382 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 383 hfsplus_cat_entry entry; 384 struct hfs_find_data fd; 385 struct inode *root, *inode; 386 struct qstr str; 387 struct nls_table *nls; 388 u64 last_fs_block, last_fs_page; 389 int silent = fc->sb_flags & SB_SILENT; 390 int err; 391 392 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); 396 397 err = -EINVAL; 398 if (!sbi->nls) { 399 /* try utf8 first, as this is the old default behaviour */ 400 sbi->nls = load_nls("utf8"); 401 if (!sbi->nls) 402 sbi->nls = load_nls_default(); 403 } 404 405 /* temporarily use utf8 to correctly find the hidden dir below */ 406 nls = sbi->nls; 407 sbi->nls = load_nls("utf8"); 408 if (!sbi->nls) { 409 pr_err("unable to load nls for utf8\n"); 410 goto out_unload_nls; 411 } 412 413 /* Grab the volume header */ 414 if (hfsplus_read_wrapper(sb)) { 415 if (!silent) 416 pr_warn("unable to find HFS+ superblock\n"); 417 goto out_unload_nls; 418 } 419 vhdr = sbi->s_vhdr; 420 421 /* Copy parts of the volume header into the superblock */ 422 sb->s_magic = HFSPLUS_VOLHEAD_SIG; 423 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION || 424 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) { 425 pr_err("wrong filesystem version\n"); 426 goto out_free_vhdr; 427 } 428 sbi->total_blocks = be32_to_cpu(vhdr->total_blocks); 429 sbi->free_blocks = be32_to_cpu(vhdr->free_blocks); 430 sbi->next_cnid = be32_to_cpu(vhdr->next_cnid); 431 sbi->file_count = be32_to_cpu(vhdr->file_count); 432 sbi->folder_count = be32_to_cpu(vhdr->folder_count); 433 sbi->data_clump_blocks = 434 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift; 435 if (!sbi->data_clump_blocks) 436 sbi->data_clump_blocks = 1; 437 sbi->rsrc_clump_blocks = 438 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift; 439 if (!sbi->rsrc_clump_blocks) 440 sbi->rsrc_clump_blocks = 1; 441 442 err = -EFBIG; 443 last_fs_block = sbi->total_blocks - 1; 444 last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >> 445 PAGE_SHIFT; 446 447 if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) || 448 (last_fs_page > (pgoff_t)(~0ULL))) { 449 pr_err("filesystem size too large\n"); 450 goto out_free_vhdr; 451 } 452 453 /* Set up operations so we can load metadata */ 454 sb->s_op = &hfsplus_sops; 455 sb->s_maxbytes = MAX_LFS_FILESIZE; 456 457 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 458 pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. mounting read-only.\n"); 459 sb->s_flags |= SB_RDONLY; 460 } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) { 461 /* nothing */ 462 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 463 pr_warn("Filesystem is marked locked, mounting read-only.\n"); 464 sb->s_flags |= SB_RDONLY; 465 } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && 466 !sb_rdonly(sb)) { 467 pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, mounting read-only.\n"); 468 sb->s_flags |= SB_RDONLY; 469 } 470 471 err = -EINVAL; 472 473 /* Load metadata objects (B*Trees) */ 474 sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID); 475 if (!sbi->ext_tree) { 476 pr_err("failed to load extents file\n"); 477 goto out_free_vhdr; 478 } 479 sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID); 480 if (!sbi->cat_tree) { 481 pr_err("failed to load catalog file\n"); 482 goto out_close_ext_tree; 483 } 484 atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE); 485 if (vhdr->attr_file.total_blocks != 0) { 486 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID); 487 if (!sbi->attr_tree) { 488 pr_err("failed to load attributes file\n"); 489 goto out_close_cat_tree; 490 } 491 atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE); 492 } 493 sb->s_xattr = hfsplus_xattr_handlers; 494 495 inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID); 496 if (IS_ERR(inode)) { 497 pr_err("failed to load allocation file\n"); 498 err = PTR_ERR(inode); 499 goto out_close_attr_tree; 500 } 501 sbi->alloc_file = inode; 502 503 /* Load the root directory */ 504 root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID); 505 if (IS_ERR(root)) { 506 pr_err("failed to load root directory\n"); 507 err = PTR_ERR(root); 508 goto out_put_alloc_file; 509 } 510 511 sb->s_d_op = &hfsplus_dentry_operations; 512 sb->s_root = d_make_root(root); 513 if (!sb->s_root) { 514 err = -ENOMEM; 515 goto out_put_alloc_file; 516 } 517 518 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1; 519 str.name = HFSP_HIDDENDIR_NAME; 520 err = hfs_find_init(sbi->cat_tree, &fd); 521 if (err) 522 goto out_put_root; 523 err = hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str); 524 if (unlikely(err < 0)) 525 goto out_put_root; 526 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) { 527 hfs_find_exit(&fd); 528 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) { 529 err = -EINVAL; 530 goto out_put_root; 531 } 532 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id)); 533 if (IS_ERR(inode)) { 534 err = PTR_ERR(inode); 535 goto out_put_root; 536 } 537 sbi->hidden_dir = inode; 538 } else 539 hfs_find_exit(&fd); 540 541 if (!sb_rdonly(sb)) { 542 /* 543 * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused 544 * all three are registered with Apple for our use 545 */ 546 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION); 547 vhdr->modify_date = hfsp_now2mt(); 548 be32_add_cpu(&vhdr->write_count, 1); 549 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT); 550 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT); 551 hfsplus_sync_fs(sb, 1); 552 553 if (!sbi->hidden_dir) { 554 mutex_lock(&sbi->vh_mutex); 555 sbi->hidden_dir = hfsplus_new_inode(sb, root, S_IFDIR); 556 if (!sbi->hidden_dir) { 557 mutex_unlock(&sbi->vh_mutex); 558 err = -ENOMEM; 559 goto out_put_root; 560 } 561 err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root, 562 &str, sbi->hidden_dir); 563 if (err) { 564 mutex_unlock(&sbi->vh_mutex); 565 goto out_put_hidden_dir; 566 } 567 568 err = hfsplus_init_security(sbi->hidden_dir, 569 root, &str); 570 if (err == -EOPNOTSUPP) 571 err = 0; /* Operation is not supported. */ 572 else if (err) { 573 /* 574 * Try to delete anyway without 575 * error analysis. 576 */ 577 hfsplus_delete_cat(sbi->hidden_dir->i_ino, 578 root, &str); 579 mutex_unlock(&sbi->vh_mutex); 580 goto out_put_hidden_dir; 581 } 582 583 mutex_unlock(&sbi->vh_mutex); 584 hfsplus_mark_inode_dirty(sbi->hidden_dir, 585 HFSPLUS_I_CAT_DIRTY); 586 } 587 } 588 589 unload_nls(sbi->nls); 590 sbi->nls = nls; 591 return 0; 592 593 out_put_hidden_dir: 594 cancel_delayed_work_sync(&sbi->sync_work); 595 iput(sbi->hidden_dir); 596 out_put_root: 597 dput(sb->s_root); 598 sb->s_root = NULL; 599 out_put_alloc_file: 600 iput(sbi->alloc_file); 601 out_close_attr_tree: 602 hfs_btree_close(sbi->attr_tree); 603 out_close_cat_tree: 604 hfs_btree_close(sbi->cat_tree); 605 out_close_ext_tree: 606 hfs_btree_close(sbi->ext_tree); 607 out_free_vhdr: 608 kfree(sbi->s_vhdr_buf); 609 kfree(sbi->s_backup_vhdr_buf); 610 out_unload_nls: 611 unload_nls(sbi->nls); 612 unload_nls(nls); 613 kfree(sbi); 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 int hfsplus_get_tree(struct fs_context *fc) 639 { 640 return get_tree_bdev(fc, hfsplus_fill_super); 641 } 642 643 static void hfsplus_free_fc(struct fs_context *fc) 644 { 645 kfree(fc->s_fs_info); 646 } 647 648 static const struct fs_context_operations hfsplus_context_ops = { 649 .parse_param = hfsplus_parse_param, 650 .get_tree = hfsplus_get_tree, 651 .reconfigure = hfsplus_reconfigure, 652 .free = hfsplus_free_fc, 653 }; 654 655 static int hfsplus_init_fs_context(struct fs_context *fc) 656 { 657 struct hfsplus_sb_info *sbi; 658 659 sbi = kzalloc(sizeof(struct hfsplus_sb_info), GFP_KERNEL); 660 if (!sbi) 661 return -ENOMEM; 662 663 if (fc->purpose != FS_CONTEXT_FOR_RECONFIGURE) 664 hfsplus_fill_defaults(sbi); 665 666 fc->s_fs_info = sbi; 667 fc->ops = &hfsplus_context_ops; 668 669 return 0; 670 } 671 672 static struct file_system_type hfsplus_fs_type = { 673 .owner = THIS_MODULE, 674 .name = "hfsplus", 675 .kill_sb = kill_block_super, 676 .fs_flags = FS_REQUIRES_DEV, 677 .init_fs_context = hfsplus_init_fs_context, 678 }; 679 MODULE_ALIAS_FS("hfsplus"); 680 681 static void hfsplus_init_once(void *p) 682 { 683 struct hfsplus_inode_info *i = p; 684 685 inode_init_once(&i->vfs_inode); 686 } 687 688 static int __init init_hfsplus_fs(void) 689 { 690 int err; 691 692 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache", 693 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, 694 hfsplus_init_once); 695 if (!hfsplus_inode_cachep) 696 return -ENOMEM; 697 err = hfsplus_create_attr_tree_cache(); 698 if (err) 699 goto destroy_inode_cache; 700 err = register_filesystem(&hfsplus_fs_type); 701 if (err) 702 goto destroy_attr_tree_cache; 703 return 0; 704 705 destroy_attr_tree_cache: 706 hfsplus_destroy_attr_tree_cache(); 707 708 destroy_inode_cache: 709 kmem_cache_destroy(hfsplus_inode_cachep); 710 711 return err; 712 } 713 714 static void __exit exit_hfsplus_fs(void) 715 { 716 unregister_filesystem(&hfsplus_fs_type); 717 718 /* 719 * Make sure all delayed rcu free inodes are flushed before we 720 * destroy cache. 721 */ 722 rcu_barrier(); 723 hfsplus_destroy_attr_tree_cache(); 724 kmem_cache_destroy(hfsplus_inode_cachep); 725 } 726 727 module_init(init_hfsplus_fs) 728 module_exit(exit_hfsplus_fs) 729