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/blkdev.h> 14 #include <linux/backing-dev.h> 15 #include <linux/fs.h> 16 #include <linux/slab.h> 17 #include <linux/vfs.h> 18 #include <linux/nls.h> 19 20 static struct inode *hfsplus_alloc_inode(struct super_block *sb); 21 static void hfsplus_destroy_inode(struct inode *inode); 22 23 #include "hfsplus_fs.h" 24 #include "xattr.h" 25 26 static int hfsplus_system_read_inode(struct inode *inode) 27 { 28 struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr; 29 30 switch (inode->i_ino) { 31 case HFSPLUS_EXT_CNID: 32 hfsplus_inode_read_fork(inode, &vhdr->ext_file); 33 inode->i_mapping->a_ops = &hfsplus_btree_aops; 34 break; 35 case HFSPLUS_CAT_CNID: 36 hfsplus_inode_read_fork(inode, &vhdr->cat_file); 37 inode->i_mapping->a_ops = &hfsplus_btree_aops; 38 break; 39 case HFSPLUS_ALLOC_CNID: 40 hfsplus_inode_read_fork(inode, &vhdr->alloc_file); 41 inode->i_mapping->a_ops = &hfsplus_aops; 42 break; 43 case HFSPLUS_START_CNID: 44 hfsplus_inode_read_fork(inode, &vhdr->start_file); 45 break; 46 case HFSPLUS_ATTR_CNID: 47 hfsplus_inode_read_fork(inode, &vhdr->attr_file); 48 inode->i_mapping->a_ops = &hfsplus_btree_aops; 49 break; 50 default: 51 return -EIO; 52 } 53 54 return 0; 55 } 56 57 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino) 58 { 59 struct hfs_find_data fd; 60 struct inode *inode; 61 int err; 62 63 inode = iget_locked(sb, ino); 64 if (!inode) 65 return ERR_PTR(-ENOMEM); 66 if (!(inode->i_state & I_NEW)) 67 return inode; 68 69 INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list); 70 spin_lock_init(&HFSPLUS_I(inode)->open_dir_lock); 71 mutex_init(&HFSPLUS_I(inode)->extents_lock); 72 HFSPLUS_I(inode)->flags = 0; 73 HFSPLUS_I(inode)->extent_state = 0; 74 HFSPLUS_I(inode)->rsrc_inode = NULL; 75 atomic_set(&HFSPLUS_I(inode)->opencnt, 0); 76 77 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || 78 inode->i_ino == HFSPLUS_ROOT_CNID) { 79 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); 80 if (!err) { 81 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); 82 if (!err) 83 err = hfsplus_cat_read_inode(inode, &fd); 84 hfs_find_exit(&fd); 85 } 86 } else { 87 err = hfsplus_system_read_inode(inode); 88 } 89 90 if (err) { 91 iget_failed(inode); 92 return ERR_PTR(err); 93 } 94 95 unlock_new_inode(inode); 96 return inode; 97 } 98 99 static int hfsplus_system_write_inode(struct inode *inode) 100 { 101 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); 102 struct hfsplus_vh *vhdr = sbi->s_vhdr; 103 struct hfsplus_fork_raw *fork; 104 struct hfs_btree *tree = NULL; 105 106 switch (inode->i_ino) { 107 case HFSPLUS_EXT_CNID: 108 fork = &vhdr->ext_file; 109 tree = sbi->ext_tree; 110 break; 111 case HFSPLUS_CAT_CNID: 112 fork = &vhdr->cat_file; 113 tree = sbi->cat_tree; 114 break; 115 case HFSPLUS_ALLOC_CNID: 116 fork = &vhdr->alloc_file; 117 break; 118 case HFSPLUS_START_CNID: 119 fork = &vhdr->start_file; 120 break; 121 case HFSPLUS_ATTR_CNID: 122 fork = &vhdr->attr_file; 123 tree = sbi->attr_tree; 124 break; 125 default: 126 return -EIO; 127 } 128 129 if (fork->total_size != cpu_to_be64(inode->i_size)) { 130 set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags); 131 hfsplus_mark_mdb_dirty(inode->i_sb); 132 } 133 hfsplus_inode_write_fork(inode, fork); 134 if (tree) { 135 int err = hfs_btree_write(tree); 136 137 if (err) { 138 pr_err("b-tree write err: %d, ino %lu\n", 139 err, inode->i_ino); 140 return err; 141 } 142 } 143 return 0; 144 } 145 146 static int hfsplus_write_inode(struct inode *inode, 147 struct writeback_control *wbc) 148 { 149 int err; 150 151 hfs_dbg(INODE, "hfsplus_write_inode: %lu\n", inode->i_ino); 152 153 err = hfsplus_ext_write_extent(inode); 154 if (err) 155 return err; 156 157 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || 158 inode->i_ino == HFSPLUS_ROOT_CNID) 159 return hfsplus_cat_write_inode(inode); 160 else 161 return hfsplus_system_write_inode(inode); 162 } 163 164 static void hfsplus_evict_inode(struct inode *inode) 165 { 166 hfs_dbg(INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino); 167 truncate_inode_pages_final(&inode->i_data); 168 clear_inode(inode); 169 if (HFSPLUS_IS_RSRC(inode)) { 170 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL; 171 iput(HFSPLUS_I(inode)->rsrc_inode); 172 } 173 } 174 175 static int hfsplus_sync_fs(struct super_block *sb, int wait) 176 { 177 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 178 struct hfsplus_vh *vhdr = sbi->s_vhdr; 179 int write_backup = 0; 180 int error, error2; 181 182 if (!wait) 183 return 0; 184 185 hfs_dbg(SUPER, "hfsplus_sync_fs\n"); 186 187 /* 188 * Explicitly write out the special metadata inodes. 189 * 190 * While these special inodes are marked as hashed and written 191 * out peridocically by the flusher threads we redirty them 192 * during writeout of normal inodes, and thus the life lock 193 * prevents us from getting the latest state to disk. 194 */ 195 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping); 196 error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping); 197 if (!error) 198 error = error2; 199 if (sbi->attr_tree) { 200 error2 = 201 filemap_write_and_wait(sbi->attr_tree->inode->i_mapping); 202 if (!error) 203 error = error2; 204 } 205 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping); 206 if (!error) 207 error = error2; 208 209 mutex_lock(&sbi->vh_mutex); 210 mutex_lock(&sbi->alloc_mutex); 211 vhdr->free_blocks = cpu_to_be32(sbi->free_blocks); 212 vhdr->next_cnid = cpu_to_be32(sbi->next_cnid); 213 vhdr->folder_count = cpu_to_be32(sbi->folder_count); 214 vhdr->file_count = cpu_to_be32(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 REQ_SYNC); 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 REQ_SYNC); 234 if (!error) 235 error2 = error; 236 out: 237 mutex_unlock(&sbi->alloc_mutex); 238 mutex_unlock(&sbi->vh_mutex); 239 240 if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags)) 241 blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL); 242 243 return error; 244 } 245 246 static void delayed_sync_fs(struct work_struct *work) 247 { 248 int err; 249 struct hfsplus_sb_info *sbi; 250 251 sbi = container_of(work, struct hfsplus_sb_info, sync_work.work); 252 253 spin_lock(&sbi->work_lock); 254 sbi->work_queued = 0; 255 spin_unlock(&sbi->work_lock); 256 257 err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1); 258 if (err) 259 pr_err("delayed sync fs err %d\n", err); 260 } 261 262 void hfsplus_mark_mdb_dirty(struct super_block *sb) 263 { 264 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 265 unsigned long delay; 266 267 if (sb_rdonly(sb)) 268 return; 269 270 spin_lock(&sbi->work_lock); 271 if (!sbi->work_queued) { 272 delay = msecs_to_jiffies(dirty_writeback_interval * 10); 273 queue_delayed_work(system_long_wq, &sbi->sync_work, delay); 274 sbi->work_queued = 1; 275 } 276 spin_unlock(&sbi->work_lock); 277 } 278 279 static void hfsplus_put_super(struct super_block *sb) 280 { 281 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 282 283 hfs_dbg(SUPER, "hfsplus_put_super\n"); 284 285 cancel_delayed_work_sync(&sbi->sync_work); 286 287 if (!sb_rdonly(sb) && sbi->s_vhdr) { 288 struct hfsplus_vh *vhdr = sbi->s_vhdr; 289 290 vhdr->modify_date = hfsp_now2mt(); 291 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT); 292 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT); 293 294 hfsplus_sync_fs(sb, 1); 295 } 296 297 hfs_btree_close(sbi->attr_tree); 298 hfs_btree_close(sbi->cat_tree); 299 hfs_btree_close(sbi->ext_tree); 300 iput(sbi->alloc_file); 301 iput(sbi->hidden_dir); 302 kfree(sbi->s_vhdr_buf); 303 kfree(sbi->s_backup_vhdr_buf); 304 unload_nls(sbi->nls); 305 kfree(sb->s_fs_info); 306 sb->s_fs_info = NULL; 307 } 308 309 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf) 310 { 311 struct super_block *sb = dentry->d_sb; 312 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 313 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 314 315 buf->f_type = HFSPLUS_SUPER_MAGIC; 316 buf->f_bsize = sb->s_blocksize; 317 buf->f_blocks = sbi->total_blocks << sbi->fs_shift; 318 buf->f_bfree = sbi->free_blocks << sbi->fs_shift; 319 buf->f_bavail = buf->f_bfree; 320 buf->f_files = 0xFFFFFFFF; 321 buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid; 322 buf->f_fsid.val[0] = (u32)id; 323 buf->f_fsid.val[1] = (u32)(id >> 32); 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 .destroy_inode = hfsplus_destroy_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 goto out_put_root; 529 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id)); 530 if (IS_ERR(inode)) { 531 err = PTR_ERR(inode); 532 goto out_put_root; 533 } 534 sbi->hidden_dir = inode; 535 } else 536 hfs_find_exit(&fd); 537 538 if (!sb_rdonly(sb)) { 539 /* 540 * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused 541 * all three are registered with Apple for our use 542 */ 543 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION); 544 vhdr->modify_date = hfsp_now2mt(); 545 be32_add_cpu(&vhdr->write_count, 1); 546 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT); 547 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT); 548 hfsplus_sync_fs(sb, 1); 549 550 if (!sbi->hidden_dir) { 551 mutex_lock(&sbi->vh_mutex); 552 sbi->hidden_dir = hfsplus_new_inode(sb, root, S_IFDIR); 553 if (!sbi->hidden_dir) { 554 mutex_unlock(&sbi->vh_mutex); 555 err = -ENOMEM; 556 goto out_put_root; 557 } 558 err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root, 559 &str, sbi->hidden_dir); 560 if (err) { 561 mutex_unlock(&sbi->vh_mutex); 562 goto out_put_hidden_dir; 563 } 564 565 err = hfsplus_init_inode_security(sbi->hidden_dir, 566 root, &str); 567 if (err == -EOPNOTSUPP) 568 err = 0; /* Operation is not supported. */ 569 else if (err) { 570 /* 571 * Try to delete anyway without 572 * error analysis. 573 */ 574 hfsplus_delete_cat(sbi->hidden_dir->i_ino, 575 root, &str); 576 mutex_unlock(&sbi->vh_mutex); 577 goto out_put_hidden_dir; 578 } 579 580 mutex_unlock(&sbi->vh_mutex); 581 hfsplus_mark_inode_dirty(sbi->hidden_dir, 582 HFSPLUS_I_CAT_DIRTY); 583 } 584 } 585 586 unload_nls(sbi->nls); 587 sbi->nls = nls; 588 return 0; 589 590 out_put_hidden_dir: 591 iput(sbi->hidden_dir); 592 out_put_root: 593 dput(sb->s_root); 594 sb->s_root = NULL; 595 out_put_alloc_file: 596 iput(sbi->alloc_file); 597 out_close_attr_tree: 598 hfs_btree_close(sbi->attr_tree); 599 out_close_cat_tree: 600 hfs_btree_close(sbi->cat_tree); 601 out_close_ext_tree: 602 hfs_btree_close(sbi->ext_tree); 603 out_free_vhdr: 604 kfree(sbi->s_vhdr_buf); 605 kfree(sbi->s_backup_vhdr_buf); 606 out_unload_nls: 607 unload_nls(sbi->nls); 608 unload_nls(nls); 609 kfree(sbi); 610 out: 611 return err; 612 } 613 614 MODULE_AUTHOR("Brad Boyer"); 615 MODULE_DESCRIPTION("Extended Macintosh Filesystem"); 616 MODULE_LICENSE("GPL"); 617 618 static struct kmem_cache *hfsplus_inode_cachep; 619 620 static struct inode *hfsplus_alloc_inode(struct super_block *sb) 621 { 622 struct hfsplus_inode_info *i; 623 624 i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL); 625 return i ? &i->vfs_inode : NULL; 626 } 627 628 static void hfsplus_i_callback(struct rcu_head *head) 629 { 630 struct inode *inode = container_of(head, struct inode, i_rcu); 631 632 kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode)); 633 } 634 635 static void hfsplus_destroy_inode(struct inode *inode) 636 { 637 call_rcu(&inode->i_rcu, hfsplus_i_callback); 638 } 639 640 #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info) 641 642 static struct dentry *hfsplus_mount(struct file_system_type *fs_type, 643 int flags, const char *dev_name, void *data) 644 { 645 return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super); 646 } 647 648 static struct file_system_type hfsplus_fs_type = { 649 .owner = THIS_MODULE, 650 .name = "hfsplus", 651 .mount = hfsplus_mount, 652 .kill_sb = kill_block_super, 653 .fs_flags = FS_REQUIRES_DEV, 654 }; 655 MODULE_ALIAS_FS("hfsplus"); 656 657 static void hfsplus_init_once(void *p) 658 { 659 struct hfsplus_inode_info *i = p; 660 661 inode_init_once(&i->vfs_inode); 662 } 663 664 static int __init init_hfsplus_fs(void) 665 { 666 int err; 667 668 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache", 669 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, 670 hfsplus_init_once); 671 if (!hfsplus_inode_cachep) 672 return -ENOMEM; 673 err = hfsplus_create_attr_tree_cache(); 674 if (err) 675 goto destroy_inode_cache; 676 err = register_filesystem(&hfsplus_fs_type); 677 if (err) 678 goto destroy_attr_tree_cache; 679 return 0; 680 681 destroy_attr_tree_cache: 682 hfsplus_destroy_attr_tree_cache(); 683 684 destroy_inode_cache: 685 kmem_cache_destroy(hfsplus_inode_cachep); 686 687 return err; 688 } 689 690 static void __exit exit_hfsplus_fs(void) 691 { 692 unregister_filesystem(&hfsplus_fs_type); 693 694 /* 695 * Make sure all delayed rcu free inodes are flushed before we 696 * destroy cache. 697 */ 698 rcu_barrier(); 699 hfsplus_destroy_attr_tree_cache(); 700 kmem_cache_destroy(hfsplus_inode_cachep); 701 } 702 703 module_init(init_hfsplus_fs) 704 module_exit(exit_hfsplus_fs) 705