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/fs.h> 15 #include <linux/slab.h> 16 #include <linux/vfs.h> 17 #include <linux/nls.h> 18 19 static struct inode *hfsplus_alloc_inode(struct super_block *sb); 20 static void hfsplus_destroy_inode(struct inode *inode); 21 22 #include "hfsplus_fs.h" 23 24 static int hfsplus_system_read_inode(struct inode *inode) 25 { 26 struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr; 27 28 switch (inode->i_ino) { 29 case HFSPLUS_EXT_CNID: 30 hfsplus_inode_read_fork(inode, &vhdr->ext_file); 31 inode->i_mapping->a_ops = &hfsplus_btree_aops; 32 break; 33 case HFSPLUS_CAT_CNID: 34 hfsplus_inode_read_fork(inode, &vhdr->cat_file); 35 inode->i_mapping->a_ops = &hfsplus_btree_aops; 36 break; 37 case HFSPLUS_ALLOC_CNID: 38 hfsplus_inode_read_fork(inode, &vhdr->alloc_file); 39 inode->i_mapping->a_ops = &hfsplus_aops; 40 break; 41 case HFSPLUS_START_CNID: 42 hfsplus_inode_read_fork(inode, &vhdr->start_file); 43 break; 44 case HFSPLUS_ATTR_CNID: 45 hfsplus_inode_read_fork(inode, &vhdr->attr_file); 46 inode->i_mapping->a_ops = &hfsplus_btree_aops; 47 break; 48 default: 49 return -EIO; 50 } 51 52 return 0; 53 } 54 55 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino) 56 { 57 struct hfs_find_data fd; 58 struct inode *inode; 59 int err; 60 61 inode = iget_locked(sb, ino); 62 if (!inode) 63 return ERR_PTR(-ENOMEM); 64 if (!(inode->i_state & I_NEW)) 65 return inode; 66 67 INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list); 68 mutex_init(&HFSPLUS_I(inode)->extents_lock); 69 HFSPLUS_I(inode)->flags = 0; 70 HFSPLUS_I(inode)->extent_state = 0; 71 HFSPLUS_I(inode)->rsrc_inode = NULL; 72 atomic_set(&HFSPLUS_I(inode)->opencnt, 0); 73 74 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || 75 inode->i_ino == HFSPLUS_ROOT_CNID) { 76 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); 77 if (!err) { 78 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); 79 if (!err) 80 err = hfsplus_cat_read_inode(inode, &fd); 81 hfs_find_exit(&fd); 82 } 83 } else { 84 err = hfsplus_system_read_inode(inode); 85 } 86 87 if (err) { 88 iget_failed(inode); 89 return ERR_PTR(err); 90 } 91 92 unlock_new_inode(inode); 93 return inode; 94 } 95 96 static int hfsplus_system_write_inode(struct inode *inode) 97 { 98 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); 99 struct hfsplus_vh *vhdr = sbi->s_vhdr; 100 struct hfsplus_fork_raw *fork; 101 struct hfs_btree *tree = NULL; 102 103 switch (inode->i_ino) { 104 case HFSPLUS_EXT_CNID: 105 fork = &vhdr->ext_file; 106 tree = sbi->ext_tree; 107 break; 108 case HFSPLUS_CAT_CNID: 109 fork = &vhdr->cat_file; 110 tree = sbi->cat_tree; 111 break; 112 case HFSPLUS_ALLOC_CNID: 113 fork = &vhdr->alloc_file; 114 break; 115 case HFSPLUS_START_CNID: 116 fork = &vhdr->start_file; 117 break; 118 case HFSPLUS_ATTR_CNID: 119 fork = &vhdr->attr_file; 120 tree = sbi->attr_tree; 121 default: 122 return -EIO; 123 } 124 125 if (fork->total_size != cpu_to_be64(inode->i_size)) { 126 set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags); 127 hfsplus_mark_mdb_dirty(inode->i_sb); 128 } 129 hfsplus_inode_write_fork(inode, fork); 130 if (tree) 131 hfs_btree_write(tree); 132 return 0; 133 } 134 135 static int hfsplus_write_inode(struct inode *inode, 136 struct writeback_control *wbc) 137 { 138 int err; 139 140 dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino); 141 142 err = hfsplus_ext_write_extent(inode); 143 if (err) 144 return err; 145 146 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || 147 inode->i_ino == HFSPLUS_ROOT_CNID) 148 return hfsplus_cat_write_inode(inode); 149 else 150 return hfsplus_system_write_inode(inode); 151 } 152 153 static void hfsplus_evict_inode(struct inode *inode) 154 { 155 dprint(DBG_INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino); 156 truncate_inode_pages(&inode->i_data, 0); 157 clear_inode(inode); 158 if (HFSPLUS_IS_RSRC(inode)) { 159 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL; 160 iput(HFSPLUS_I(inode)->rsrc_inode); 161 } 162 } 163 164 static int hfsplus_sync_fs(struct super_block *sb, int wait) 165 { 166 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 167 struct hfsplus_vh *vhdr = sbi->s_vhdr; 168 int write_backup = 0; 169 int error, error2; 170 171 if (!wait) 172 return 0; 173 174 dprint(DBG_SUPER, "hfsplus_sync_fs\n"); 175 176 /* 177 * Explicitly write out the special metadata inodes. 178 * 179 * While these special inodes are marked as hashed and written 180 * out peridocically by the flusher threads we redirty them 181 * during writeout of normal inodes, and thus the life lock 182 * prevents us from getting the latest state to disk. 183 */ 184 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping); 185 error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping); 186 if (!error) 187 error = error2; 188 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping); 189 if (!error) 190 error = error2; 191 192 mutex_lock(&sbi->vh_mutex); 193 mutex_lock(&sbi->alloc_mutex); 194 vhdr->free_blocks = cpu_to_be32(sbi->free_blocks); 195 vhdr->next_cnid = cpu_to_be32(sbi->next_cnid); 196 vhdr->folder_count = cpu_to_be32(sbi->folder_count); 197 vhdr->file_count = cpu_to_be32(sbi->file_count); 198 199 if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) { 200 memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr)); 201 write_backup = 1; 202 } 203 204 error2 = hfsplus_submit_bio(sb, 205 sbi->part_start + HFSPLUS_VOLHEAD_SECTOR, 206 sbi->s_vhdr_buf, NULL, WRITE_SYNC); 207 if (!error) 208 error = error2; 209 if (!write_backup) 210 goto out; 211 212 error2 = hfsplus_submit_bio(sb, 213 sbi->part_start + sbi->sect_count - 2, 214 sbi->s_backup_vhdr_buf, NULL, WRITE_SYNC); 215 if (!error) 216 error2 = error; 217 out: 218 mutex_unlock(&sbi->alloc_mutex); 219 mutex_unlock(&sbi->vh_mutex); 220 221 if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags)) 222 blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL); 223 224 return error; 225 } 226 227 static void delayed_sync_fs(struct work_struct *work) 228 { 229 struct hfsplus_sb_info *sbi; 230 231 sbi = container_of(work, struct hfsplus_sb_info, sync_work.work); 232 233 spin_lock(&sbi->work_lock); 234 sbi->work_queued = 0; 235 spin_unlock(&sbi->work_lock); 236 237 hfsplus_sync_fs(sbi->alloc_file->i_sb, 1); 238 } 239 240 void hfsplus_mark_mdb_dirty(struct super_block *sb) 241 { 242 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 243 unsigned long delay; 244 245 if (sb->s_flags & MS_RDONLY) 246 return; 247 248 spin_lock(&sbi->work_lock); 249 if (!sbi->work_queued) { 250 delay = msecs_to_jiffies(dirty_writeback_interval * 10); 251 queue_delayed_work(system_long_wq, &sbi->sync_work, delay); 252 sbi->work_queued = 1; 253 } 254 spin_unlock(&sbi->work_lock); 255 } 256 257 static void hfsplus_put_super(struct super_block *sb) 258 { 259 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 260 261 dprint(DBG_SUPER, "hfsplus_put_super\n"); 262 263 cancel_delayed_work_sync(&sbi->sync_work); 264 265 if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) { 266 struct hfsplus_vh *vhdr = sbi->s_vhdr; 267 268 vhdr->modify_date = hfsp_now2mt(); 269 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT); 270 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT); 271 272 hfsplus_sync_fs(sb, 1); 273 } 274 275 hfs_btree_close(sbi->cat_tree); 276 hfs_btree_close(sbi->ext_tree); 277 iput(sbi->alloc_file); 278 iput(sbi->hidden_dir); 279 kfree(sbi->s_vhdr_buf); 280 kfree(sbi->s_backup_vhdr_buf); 281 unload_nls(sbi->nls); 282 kfree(sb->s_fs_info); 283 sb->s_fs_info = NULL; 284 } 285 286 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf) 287 { 288 struct super_block *sb = dentry->d_sb; 289 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 290 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 291 292 buf->f_type = HFSPLUS_SUPER_MAGIC; 293 buf->f_bsize = sb->s_blocksize; 294 buf->f_blocks = sbi->total_blocks << sbi->fs_shift; 295 buf->f_bfree = sbi->free_blocks << sbi->fs_shift; 296 buf->f_bavail = buf->f_bfree; 297 buf->f_files = 0xFFFFFFFF; 298 buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid; 299 buf->f_fsid.val[0] = (u32)id; 300 buf->f_fsid.val[1] = (u32)(id >> 32); 301 buf->f_namelen = HFSPLUS_MAX_STRLEN; 302 303 return 0; 304 } 305 306 static int hfsplus_remount(struct super_block *sb, int *flags, char *data) 307 { 308 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 309 return 0; 310 if (!(*flags & MS_RDONLY)) { 311 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr; 312 int force = 0; 313 314 if (!hfsplus_parse_options_remount(data, &force)) 315 return -EINVAL; 316 317 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 318 printk(KERN_WARNING "hfs: filesystem was " 319 "not cleanly unmounted, " 320 "running fsck.hfsplus is recommended. " 321 "leaving read-only.\n"); 322 sb->s_flags |= MS_RDONLY; 323 *flags |= MS_RDONLY; 324 } else if (force) { 325 /* nothing */ 326 } else if (vhdr->attributes & 327 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 328 printk(KERN_WARNING "hfs: filesystem is marked locked, " 329 "leaving read-only.\n"); 330 sb->s_flags |= MS_RDONLY; 331 *flags |= MS_RDONLY; 332 } else if (vhdr->attributes & 333 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) { 334 printk(KERN_WARNING "hfs: filesystem is " 335 "marked journaled, " 336 "leaving read-only.\n"); 337 sb->s_flags |= MS_RDONLY; 338 *flags |= MS_RDONLY; 339 } 340 } 341 return 0; 342 } 343 344 static const struct super_operations hfsplus_sops = { 345 .alloc_inode = hfsplus_alloc_inode, 346 .destroy_inode = hfsplus_destroy_inode, 347 .write_inode = hfsplus_write_inode, 348 .evict_inode = hfsplus_evict_inode, 349 .put_super = hfsplus_put_super, 350 .sync_fs = hfsplus_sync_fs, 351 .statfs = hfsplus_statfs, 352 .remount_fs = hfsplus_remount, 353 .show_options = hfsplus_show_options, 354 }; 355 356 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent) 357 { 358 struct hfsplus_vh *vhdr; 359 struct hfsplus_sb_info *sbi; 360 hfsplus_cat_entry entry; 361 struct hfs_find_data fd; 362 struct inode *root, *inode; 363 struct qstr str; 364 struct nls_table *nls = NULL; 365 u64 last_fs_block, last_fs_page; 366 int err; 367 368 err = -ENOMEM; 369 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 370 if (!sbi) 371 goto out; 372 373 sb->s_fs_info = sbi; 374 mutex_init(&sbi->alloc_mutex); 375 mutex_init(&sbi->vh_mutex); 376 spin_lock_init(&sbi->work_lock); 377 INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs); 378 hfsplus_fill_defaults(sbi); 379 380 err = -EINVAL; 381 if (!hfsplus_parse_options(data, sbi)) { 382 printk(KERN_ERR "hfs: unable to parse mount options\n"); 383 goto out_unload_nls; 384 } 385 386 /* temporarily use utf8 to correctly find the hidden dir below */ 387 nls = sbi->nls; 388 sbi->nls = load_nls("utf8"); 389 if (!sbi->nls) { 390 printk(KERN_ERR "hfs: unable to load nls for utf8\n"); 391 goto out_unload_nls; 392 } 393 394 /* Grab the volume header */ 395 if (hfsplus_read_wrapper(sb)) { 396 if (!silent) 397 printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n"); 398 goto out_unload_nls; 399 } 400 vhdr = sbi->s_vhdr; 401 402 /* Copy parts of the volume header into the superblock */ 403 sb->s_magic = HFSPLUS_VOLHEAD_SIG; 404 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION || 405 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) { 406 printk(KERN_ERR "hfs: wrong filesystem version\n"); 407 goto out_free_vhdr; 408 } 409 sbi->total_blocks = be32_to_cpu(vhdr->total_blocks); 410 sbi->free_blocks = be32_to_cpu(vhdr->free_blocks); 411 sbi->next_cnid = be32_to_cpu(vhdr->next_cnid); 412 sbi->file_count = be32_to_cpu(vhdr->file_count); 413 sbi->folder_count = be32_to_cpu(vhdr->folder_count); 414 sbi->data_clump_blocks = 415 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift; 416 if (!sbi->data_clump_blocks) 417 sbi->data_clump_blocks = 1; 418 sbi->rsrc_clump_blocks = 419 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift; 420 if (!sbi->rsrc_clump_blocks) 421 sbi->rsrc_clump_blocks = 1; 422 423 err = -EFBIG; 424 last_fs_block = sbi->total_blocks - 1; 425 last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >> 426 PAGE_CACHE_SHIFT; 427 428 if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) || 429 (last_fs_page > (pgoff_t)(~0ULL))) { 430 printk(KERN_ERR "hfs: filesystem size too large.\n"); 431 goto out_free_vhdr; 432 } 433 434 /* Set up operations so we can load metadata */ 435 sb->s_op = &hfsplus_sops; 436 sb->s_maxbytes = MAX_LFS_FILESIZE; 437 438 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 439 printk(KERN_WARNING "hfs: Filesystem was " 440 "not cleanly unmounted, " 441 "running fsck.hfsplus is recommended. " 442 "mounting read-only.\n"); 443 sb->s_flags |= MS_RDONLY; 444 } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) { 445 /* nothing */ 446 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 447 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n"); 448 sb->s_flags |= MS_RDONLY; 449 } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && 450 !(sb->s_flags & MS_RDONLY)) { 451 printk(KERN_WARNING "hfs: write access to " 452 "a journaled filesystem is not supported, " 453 "use the force option at your own risk, " 454 "mounting read-only.\n"); 455 sb->s_flags |= MS_RDONLY; 456 } 457 458 err = -EINVAL; 459 460 /* Load metadata objects (B*Trees) */ 461 sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID); 462 if (!sbi->ext_tree) { 463 printk(KERN_ERR "hfs: failed to load extents file\n"); 464 goto out_free_vhdr; 465 } 466 sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID); 467 if (!sbi->cat_tree) { 468 printk(KERN_ERR "hfs: failed to load catalog file\n"); 469 goto out_close_ext_tree; 470 } 471 472 inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID); 473 if (IS_ERR(inode)) { 474 printk(KERN_ERR "hfs: failed to load allocation file\n"); 475 err = PTR_ERR(inode); 476 goto out_close_cat_tree; 477 } 478 sbi->alloc_file = inode; 479 480 /* Load the root directory */ 481 root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID); 482 if (IS_ERR(root)) { 483 printk(KERN_ERR "hfs: failed to load root directory\n"); 484 err = PTR_ERR(root); 485 goto out_put_alloc_file; 486 } 487 488 sb->s_d_op = &hfsplus_dentry_operations; 489 sb->s_root = d_make_root(root); 490 if (!sb->s_root) { 491 err = -ENOMEM; 492 goto out_put_alloc_file; 493 } 494 495 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1; 496 str.name = HFSP_HIDDENDIR_NAME; 497 err = hfs_find_init(sbi->cat_tree, &fd); 498 if (err) 499 goto out_put_root; 500 hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str); 501 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) { 502 hfs_find_exit(&fd); 503 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) 504 goto out_put_root; 505 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id)); 506 if (IS_ERR(inode)) { 507 err = PTR_ERR(inode); 508 goto out_put_root; 509 } 510 sbi->hidden_dir = inode; 511 } else 512 hfs_find_exit(&fd); 513 514 if (!(sb->s_flags & MS_RDONLY)) { 515 /* 516 * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused 517 * all three are registered with Apple for our use 518 */ 519 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION); 520 vhdr->modify_date = hfsp_now2mt(); 521 be32_add_cpu(&vhdr->write_count, 1); 522 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT); 523 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT); 524 hfsplus_sync_fs(sb, 1); 525 526 if (!sbi->hidden_dir) { 527 mutex_lock(&sbi->vh_mutex); 528 sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR); 529 if (!sbi->hidden_dir) { 530 mutex_unlock(&sbi->vh_mutex); 531 err = -ENOMEM; 532 goto out_put_root; 533 } 534 err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root, 535 &str, sbi->hidden_dir); 536 mutex_unlock(&sbi->vh_mutex); 537 if (err) 538 goto out_put_hidden_dir; 539 540 hfsplus_mark_inode_dirty(sbi->hidden_dir, 541 HFSPLUS_I_CAT_DIRTY); 542 } 543 } 544 545 unload_nls(sbi->nls); 546 sbi->nls = nls; 547 return 0; 548 549 out_put_hidden_dir: 550 iput(sbi->hidden_dir); 551 out_put_root: 552 dput(sb->s_root); 553 sb->s_root = NULL; 554 out_put_alloc_file: 555 iput(sbi->alloc_file); 556 out_close_cat_tree: 557 hfs_btree_close(sbi->cat_tree); 558 out_close_ext_tree: 559 hfs_btree_close(sbi->ext_tree); 560 out_free_vhdr: 561 kfree(sbi->s_vhdr_buf); 562 kfree(sbi->s_backup_vhdr_buf); 563 out_unload_nls: 564 unload_nls(sbi->nls); 565 unload_nls(nls); 566 kfree(sbi); 567 out: 568 return err; 569 } 570 571 MODULE_AUTHOR("Brad Boyer"); 572 MODULE_DESCRIPTION("Extended Macintosh Filesystem"); 573 MODULE_LICENSE("GPL"); 574 575 static struct kmem_cache *hfsplus_inode_cachep; 576 577 static struct inode *hfsplus_alloc_inode(struct super_block *sb) 578 { 579 struct hfsplus_inode_info *i; 580 581 i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL); 582 return i ? &i->vfs_inode : NULL; 583 } 584 585 static void hfsplus_i_callback(struct rcu_head *head) 586 { 587 struct inode *inode = container_of(head, struct inode, i_rcu); 588 589 kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode)); 590 } 591 592 static void hfsplus_destroy_inode(struct inode *inode) 593 { 594 call_rcu(&inode->i_rcu, hfsplus_i_callback); 595 } 596 597 #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info) 598 599 static struct dentry *hfsplus_mount(struct file_system_type *fs_type, 600 int flags, const char *dev_name, void *data) 601 { 602 return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super); 603 } 604 605 static struct file_system_type hfsplus_fs_type = { 606 .owner = THIS_MODULE, 607 .name = "hfsplus", 608 .mount = hfsplus_mount, 609 .kill_sb = kill_block_super, 610 .fs_flags = FS_REQUIRES_DEV, 611 }; 612 613 static void hfsplus_init_once(void *p) 614 { 615 struct hfsplus_inode_info *i = p; 616 617 inode_init_once(&i->vfs_inode); 618 } 619 620 static int __init init_hfsplus_fs(void) 621 { 622 int err; 623 624 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache", 625 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN, 626 hfsplus_init_once); 627 if (!hfsplus_inode_cachep) 628 return -ENOMEM; 629 err = register_filesystem(&hfsplus_fs_type); 630 if (err) 631 kmem_cache_destroy(hfsplus_inode_cachep); 632 return err; 633 } 634 635 static void __exit exit_hfsplus_fs(void) 636 { 637 unregister_filesystem(&hfsplus_fs_type); 638 639 /* 640 * Make sure all delayed rcu free inodes are flushed before we 641 * destroy cache. 642 */ 643 rcu_barrier(); 644 kmem_cache_destroy(hfsplus_inode_cachep); 645 } 646 647 module_init(init_hfsplus_fs) 648 module_exit(exit_hfsplus_fs) 649