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 int err = hfs_btree_write(tree); 132 if (err) { 133 printk(KERN_ERR "hfs: b-tree write err: %d, ino %lu\n", 134 err, inode->i_ino); 135 return err; 136 } 137 } 138 return 0; 139 } 140 141 static int hfsplus_write_inode(struct inode *inode, 142 struct writeback_control *wbc) 143 { 144 int err; 145 146 dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino); 147 148 err = hfsplus_ext_write_extent(inode); 149 if (err) 150 return err; 151 152 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || 153 inode->i_ino == HFSPLUS_ROOT_CNID) 154 return hfsplus_cat_write_inode(inode); 155 else 156 return hfsplus_system_write_inode(inode); 157 } 158 159 static void hfsplus_evict_inode(struct inode *inode) 160 { 161 dprint(DBG_INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino); 162 truncate_inode_pages(&inode->i_data, 0); 163 clear_inode(inode); 164 if (HFSPLUS_IS_RSRC(inode)) { 165 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL; 166 iput(HFSPLUS_I(inode)->rsrc_inode); 167 } 168 } 169 170 static int hfsplus_sync_fs(struct super_block *sb, int wait) 171 { 172 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 173 struct hfsplus_vh *vhdr = sbi->s_vhdr; 174 int write_backup = 0; 175 int error, error2; 176 177 if (!wait) 178 return 0; 179 180 dprint(DBG_SUPER, "hfsplus_sync_fs\n"); 181 182 /* 183 * Explicitly write out the special metadata inodes. 184 * 185 * While these special inodes are marked as hashed and written 186 * out peridocically by the flusher threads we redirty them 187 * during writeout of normal inodes, and thus the life lock 188 * prevents us from getting the latest state to disk. 189 */ 190 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping); 191 error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping); 192 if (!error) 193 error = error2; 194 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping); 195 if (!error) 196 error = error2; 197 198 mutex_lock(&sbi->vh_mutex); 199 mutex_lock(&sbi->alloc_mutex); 200 vhdr->free_blocks = cpu_to_be32(sbi->free_blocks); 201 vhdr->next_cnid = cpu_to_be32(sbi->next_cnid); 202 vhdr->folder_count = cpu_to_be32(sbi->folder_count); 203 vhdr->file_count = cpu_to_be32(sbi->file_count); 204 205 if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) { 206 memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr)); 207 write_backup = 1; 208 } 209 210 error2 = hfsplus_submit_bio(sb, 211 sbi->part_start + HFSPLUS_VOLHEAD_SECTOR, 212 sbi->s_vhdr_buf, NULL, WRITE_SYNC); 213 if (!error) 214 error = error2; 215 if (!write_backup) 216 goto out; 217 218 error2 = hfsplus_submit_bio(sb, 219 sbi->part_start + sbi->sect_count - 2, 220 sbi->s_backup_vhdr_buf, NULL, WRITE_SYNC); 221 if (!error) 222 error2 = error; 223 out: 224 mutex_unlock(&sbi->alloc_mutex); 225 mutex_unlock(&sbi->vh_mutex); 226 227 if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags)) 228 blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL); 229 230 return error; 231 } 232 233 static void delayed_sync_fs(struct work_struct *work) 234 { 235 int err; 236 struct hfsplus_sb_info *sbi; 237 238 sbi = container_of(work, struct hfsplus_sb_info, sync_work.work); 239 240 spin_lock(&sbi->work_lock); 241 sbi->work_queued = 0; 242 spin_unlock(&sbi->work_lock); 243 244 err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1); 245 if (err) 246 printk(KERN_ERR "hfs: delayed sync fs err %d\n", err); 247 } 248 249 void hfsplus_mark_mdb_dirty(struct super_block *sb) 250 { 251 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 252 unsigned long delay; 253 254 if (sb->s_flags & MS_RDONLY) 255 return; 256 257 spin_lock(&sbi->work_lock); 258 if (!sbi->work_queued) { 259 delay = msecs_to_jiffies(dirty_writeback_interval * 10); 260 queue_delayed_work(system_long_wq, &sbi->sync_work, delay); 261 sbi->work_queued = 1; 262 } 263 spin_unlock(&sbi->work_lock); 264 } 265 266 static void hfsplus_put_super(struct super_block *sb) 267 { 268 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 269 270 dprint(DBG_SUPER, "hfsplus_put_super\n"); 271 272 cancel_delayed_work_sync(&sbi->sync_work); 273 274 if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) { 275 struct hfsplus_vh *vhdr = sbi->s_vhdr; 276 277 vhdr->modify_date = hfsp_now2mt(); 278 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT); 279 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT); 280 281 hfsplus_sync_fs(sb, 1); 282 } 283 284 hfs_btree_close(sbi->cat_tree); 285 hfs_btree_close(sbi->ext_tree); 286 iput(sbi->alloc_file); 287 iput(sbi->hidden_dir); 288 kfree(sbi->s_vhdr_buf); 289 kfree(sbi->s_backup_vhdr_buf); 290 unload_nls(sbi->nls); 291 kfree(sb->s_fs_info); 292 sb->s_fs_info = NULL; 293 } 294 295 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf) 296 { 297 struct super_block *sb = dentry->d_sb; 298 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 299 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 300 301 buf->f_type = HFSPLUS_SUPER_MAGIC; 302 buf->f_bsize = sb->s_blocksize; 303 buf->f_blocks = sbi->total_blocks << sbi->fs_shift; 304 buf->f_bfree = sbi->free_blocks << sbi->fs_shift; 305 buf->f_bavail = buf->f_bfree; 306 buf->f_files = 0xFFFFFFFF; 307 buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid; 308 buf->f_fsid.val[0] = (u32)id; 309 buf->f_fsid.val[1] = (u32)(id >> 32); 310 buf->f_namelen = HFSPLUS_MAX_STRLEN; 311 312 return 0; 313 } 314 315 static int hfsplus_remount(struct super_block *sb, int *flags, char *data) 316 { 317 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 318 return 0; 319 if (!(*flags & MS_RDONLY)) { 320 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr; 321 int force = 0; 322 323 if (!hfsplus_parse_options_remount(data, &force)) 324 return -EINVAL; 325 326 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 327 printk(KERN_WARNING "hfs: filesystem was " 328 "not cleanly unmounted, " 329 "running fsck.hfsplus is recommended. " 330 "leaving read-only.\n"); 331 sb->s_flags |= MS_RDONLY; 332 *flags |= MS_RDONLY; 333 } else if (force) { 334 /* nothing */ 335 } else if (vhdr->attributes & 336 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 337 printk(KERN_WARNING "hfs: filesystem is marked locked, " 338 "leaving read-only.\n"); 339 sb->s_flags |= MS_RDONLY; 340 *flags |= MS_RDONLY; 341 } else if (vhdr->attributes & 342 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) { 343 printk(KERN_WARNING "hfs: filesystem is " 344 "marked journaled, " 345 "leaving read-only.\n"); 346 sb->s_flags |= MS_RDONLY; 347 *flags |= MS_RDONLY; 348 } 349 } 350 return 0; 351 } 352 353 static const struct super_operations hfsplus_sops = { 354 .alloc_inode = hfsplus_alloc_inode, 355 .destroy_inode = hfsplus_destroy_inode, 356 .write_inode = hfsplus_write_inode, 357 .evict_inode = hfsplus_evict_inode, 358 .put_super = hfsplus_put_super, 359 .sync_fs = hfsplus_sync_fs, 360 .statfs = hfsplus_statfs, 361 .remount_fs = hfsplus_remount, 362 .show_options = hfsplus_show_options, 363 }; 364 365 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent) 366 { 367 struct hfsplus_vh *vhdr; 368 struct hfsplus_sb_info *sbi; 369 hfsplus_cat_entry entry; 370 struct hfs_find_data fd; 371 struct inode *root, *inode; 372 struct qstr str; 373 struct nls_table *nls = NULL; 374 u64 last_fs_block, last_fs_page; 375 int err; 376 377 err = -ENOMEM; 378 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 379 if (!sbi) 380 goto out; 381 382 sb->s_fs_info = sbi; 383 mutex_init(&sbi->alloc_mutex); 384 mutex_init(&sbi->vh_mutex); 385 spin_lock_init(&sbi->work_lock); 386 INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs); 387 hfsplus_fill_defaults(sbi); 388 389 err = -EINVAL; 390 if (!hfsplus_parse_options(data, sbi)) { 391 printk(KERN_ERR "hfs: unable to parse mount options\n"); 392 goto out_unload_nls; 393 } 394 395 /* temporarily use utf8 to correctly find the hidden dir below */ 396 nls = sbi->nls; 397 sbi->nls = load_nls("utf8"); 398 if (!sbi->nls) { 399 printk(KERN_ERR "hfs: unable to load nls for utf8\n"); 400 goto out_unload_nls; 401 } 402 403 /* Grab the volume header */ 404 if (hfsplus_read_wrapper(sb)) { 405 if (!silent) 406 printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n"); 407 goto out_unload_nls; 408 } 409 vhdr = sbi->s_vhdr; 410 411 /* Copy parts of the volume header into the superblock */ 412 sb->s_magic = HFSPLUS_VOLHEAD_SIG; 413 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION || 414 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) { 415 printk(KERN_ERR "hfs: wrong filesystem version\n"); 416 goto out_free_vhdr; 417 } 418 sbi->total_blocks = be32_to_cpu(vhdr->total_blocks); 419 sbi->free_blocks = be32_to_cpu(vhdr->free_blocks); 420 sbi->next_cnid = be32_to_cpu(vhdr->next_cnid); 421 sbi->file_count = be32_to_cpu(vhdr->file_count); 422 sbi->folder_count = be32_to_cpu(vhdr->folder_count); 423 sbi->data_clump_blocks = 424 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift; 425 if (!sbi->data_clump_blocks) 426 sbi->data_clump_blocks = 1; 427 sbi->rsrc_clump_blocks = 428 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift; 429 if (!sbi->rsrc_clump_blocks) 430 sbi->rsrc_clump_blocks = 1; 431 432 err = -EFBIG; 433 last_fs_block = sbi->total_blocks - 1; 434 last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >> 435 PAGE_CACHE_SHIFT; 436 437 if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) || 438 (last_fs_page > (pgoff_t)(~0ULL))) { 439 printk(KERN_ERR "hfs: filesystem size too large.\n"); 440 goto out_free_vhdr; 441 } 442 443 /* Set up operations so we can load metadata */ 444 sb->s_op = &hfsplus_sops; 445 sb->s_maxbytes = MAX_LFS_FILESIZE; 446 447 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 448 printk(KERN_WARNING "hfs: Filesystem was " 449 "not cleanly unmounted, " 450 "running fsck.hfsplus is recommended. " 451 "mounting read-only.\n"); 452 sb->s_flags |= MS_RDONLY; 453 } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) { 454 /* nothing */ 455 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 456 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n"); 457 sb->s_flags |= MS_RDONLY; 458 } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && 459 !(sb->s_flags & MS_RDONLY)) { 460 printk(KERN_WARNING "hfs: write access to " 461 "a journaled filesystem is not supported, " 462 "use the force option at your own risk, " 463 "mounting read-only.\n"); 464 sb->s_flags |= MS_RDONLY; 465 } 466 467 err = -EINVAL; 468 469 /* Load metadata objects (B*Trees) */ 470 sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID); 471 if (!sbi->ext_tree) { 472 printk(KERN_ERR "hfs: failed to load extents file\n"); 473 goto out_free_vhdr; 474 } 475 sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID); 476 if (!sbi->cat_tree) { 477 printk(KERN_ERR "hfs: failed to load catalog file\n"); 478 goto out_close_ext_tree; 479 } 480 481 inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID); 482 if (IS_ERR(inode)) { 483 printk(KERN_ERR "hfs: failed to load allocation file\n"); 484 err = PTR_ERR(inode); 485 goto out_close_cat_tree; 486 } 487 sbi->alloc_file = inode; 488 489 /* Load the root directory */ 490 root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID); 491 if (IS_ERR(root)) { 492 printk(KERN_ERR "hfs: failed to load root directory\n"); 493 err = PTR_ERR(root); 494 goto out_put_alloc_file; 495 } 496 497 sb->s_d_op = &hfsplus_dentry_operations; 498 sb->s_root = d_make_root(root); 499 if (!sb->s_root) { 500 err = -ENOMEM; 501 goto out_put_alloc_file; 502 } 503 504 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1; 505 str.name = HFSP_HIDDENDIR_NAME; 506 err = hfs_find_init(sbi->cat_tree, &fd); 507 if (err) 508 goto out_put_root; 509 hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str); 510 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) { 511 hfs_find_exit(&fd); 512 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) 513 goto out_put_root; 514 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id)); 515 if (IS_ERR(inode)) { 516 err = PTR_ERR(inode); 517 goto out_put_root; 518 } 519 sbi->hidden_dir = inode; 520 } else 521 hfs_find_exit(&fd); 522 523 if (!(sb->s_flags & MS_RDONLY)) { 524 /* 525 * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused 526 * all three are registered with Apple for our use 527 */ 528 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION); 529 vhdr->modify_date = hfsp_now2mt(); 530 be32_add_cpu(&vhdr->write_count, 1); 531 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT); 532 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT); 533 hfsplus_sync_fs(sb, 1); 534 535 if (!sbi->hidden_dir) { 536 mutex_lock(&sbi->vh_mutex); 537 sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR); 538 if (!sbi->hidden_dir) { 539 mutex_unlock(&sbi->vh_mutex); 540 err = -ENOMEM; 541 goto out_put_root; 542 } 543 err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root, 544 &str, sbi->hidden_dir); 545 mutex_unlock(&sbi->vh_mutex); 546 if (err) 547 goto out_put_hidden_dir; 548 549 hfsplus_mark_inode_dirty(sbi->hidden_dir, 550 HFSPLUS_I_CAT_DIRTY); 551 } 552 } 553 554 unload_nls(sbi->nls); 555 sbi->nls = nls; 556 return 0; 557 558 out_put_hidden_dir: 559 iput(sbi->hidden_dir); 560 out_put_root: 561 dput(sb->s_root); 562 sb->s_root = NULL; 563 out_put_alloc_file: 564 iput(sbi->alloc_file); 565 out_close_cat_tree: 566 hfs_btree_close(sbi->cat_tree); 567 out_close_ext_tree: 568 hfs_btree_close(sbi->ext_tree); 569 out_free_vhdr: 570 kfree(sbi->s_vhdr_buf); 571 kfree(sbi->s_backup_vhdr_buf); 572 out_unload_nls: 573 unload_nls(sbi->nls); 574 unload_nls(nls); 575 kfree(sbi); 576 out: 577 return err; 578 } 579 580 MODULE_AUTHOR("Brad Boyer"); 581 MODULE_DESCRIPTION("Extended Macintosh Filesystem"); 582 MODULE_LICENSE("GPL"); 583 584 static struct kmem_cache *hfsplus_inode_cachep; 585 586 static struct inode *hfsplus_alloc_inode(struct super_block *sb) 587 { 588 struct hfsplus_inode_info *i; 589 590 i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL); 591 return i ? &i->vfs_inode : NULL; 592 } 593 594 static void hfsplus_i_callback(struct rcu_head *head) 595 { 596 struct inode *inode = container_of(head, struct inode, i_rcu); 597 598 kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode)); 599 } 600 601 static void hfsplus_destroy_inode(struct inode *inode) 602 { 603 call_rcu(&inode->i_rcu, hfsplus_i_callback); 604 } 605 606 #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info) 607 608 static struct dentry *hfsplus_mount(struct file_system_type *fs_type, 609 int flags, const char *dev_name, void *data) 610 { 611 return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super); 612 } 613 614 static struct file_system_type hfsplus_fs_type = { 615 .owner = THIS_MODULE, 616 .name = "hfsplus", 617 .mount = hfsplus_mount, 618 .kill_sb = kill_block_super, 619 .fs_flags = FS_REQUIRES_DEV, 620 }; 621 622 static void hfsplus_init_once(void *p) 623 { 624 struct hfsplus_inode_info *i = p; 625 626 inode_init_once(&i->vfs_inode); 627 } 628 629 static int __init init_hfsplus_fs(void) 630 { 631 int err; 632 633 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache", 634 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN, 635 hfsplus_init_once); 636 if (!hfsplus_inode_cachep) 637 return -ENOMEM; 638 err = register_filesystem(&hfsplus_fs_type); 639 if (err) 640 kmem_cache_destroy(hfsplus_inode_cachep); 641 return err; 642 } 643 644 static void __exit exit_hfsplus_fs(void) 645 { 646 unregister_filesystem(&hfsplus_fs_type); 647 648 /* 649 * Make sure all delayed rcu free inodes are flushed before we 650 * destroy cache. 651 */ 652 rcu_barrier(); 653 kmem_cache_destroy(hfsplus_inode_cachep); 654 } 655 656 module_init(init_hfsplus_fs) 657 module_exit(exit_hfsplus_fs) 658