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 mutex_init(&HFSPLUS_I(inode)->extents_lock); 71 HFSPLUS_I(inode)->flags = 0; 72 HFSPLUS_I(inode)->extent_state = 0; 73 HFSPLUS_I(inode)->rsrc_inode = NULL; 74 atomic_set(&HFSPLUS_I(inode)->opencnt, 0); 75 76 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || 77 inode->i_ino == HFSPLUS_ROOT_CNID) { 78 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); 79 if (!err) { 80 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); 81 if (!err) 82 err = hfsplus_cat_read_inode(inode, &fd); 83 hfs_find_exit(&fd); 84 } 85 } else { 86 err = hfsplus_system_read_inode(inode); 87 } 88 89 if (err) { 90 iget_failed(inode); 91 return ERR_PTR(err); 92 } 93 94 unlock_new_inode(inode); 95 return inode; 96 } 97 98 static int hfsplus_system_write_inode(struct inode *inode) 99 { 100 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); 101 struct hfsplus_vh *vhdr = sbi->s_vhdr; 102 struct hfsplus_fork_raw *fork; 103 struct hfs_btree *tree = NULL; 104 105 switch (inode->i_ino) { 106 case HFSPLUS_EXT_CNID: 107 fork = &vhdr->ext_file; 108 tree = sbi->ext_tree; 109 break; 110 case HFSPLUS_CAT_CNID: 111 fork = &vhdr->cat_file; 112 tree = sbi->cat_tree; 113 break; 114 case HFSPLUS_ALLOC_CNID: 115 fork = &vhdr->alloc_file; 116 break; 117 case HFSPLUS_START_CNID: 118 fork = &vhdr->start_file; 119 break; 120 case HFSPLUS_ATTR_CNID: 121 fork = &vhdr->attr_file; 122 tree = sbi->attr_tree; 123 break; 124 default: 125 return -EIO; 126 } 127 128 if (fork->total_size != cpu_to_be64(inode->i_size)) { 129 set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags); 130 hfsplus_mark_mdb_dirty(inode->i_sb); 131 } 132 hfsplus_inode_write_fork(inode, fork); 133 if (tree) { 134 int err = hfs_btree_write(tree); 135 136 if (err) { 137 pr_err("b-tree write err: %d, ino %lu\n", 138 err, inode->i_ino); 139 return err; 140 } 141 } 142 return 0; 143 } 144 145 static int hfsplus_write_inode(struct inode *inode, 146 struct writeback_control *wbc) 147 { 148 int err; 149 150 hfs_dbg(INODE, "hfsplus_write_inode: %lu\n", inode->i_ino); 151 152 err = hfsplus_ext_write_extent(inode); 153 if (err) 154 return err; 155 156 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || 157 inode->i_ino == HFSPLUS_ROOT_CNID) 158 return hfsplus_cat_write_inode(inode); 159 else 160 return hfsplus_system_write_inode(inode); 161 } 162 163 static void hfsplus_evict_inode(struct inode *inode) 164 { 165 hfs_dbg(INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino); 166 truncate_inode_pages_final(&inode->i_data); 167 clear_inode(inode); 168 if (HFSPLUS_IS_RSRC(inode)) { 169 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL; 170 iput(HFSPLUS_I(inode)->rsrc_inode); 171 } 172 } 173 174 static int hfsplus_sync_fs(struct super_block *sb, int wait) 175 { 176 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 177 struct hfsplus_vh *vhdr = sbi->s_vhdr; 178 int write_backup = 0; 179 int error, error2; 180 181 if (!wait) 182 return 0; 183 184 hfs_dbg(SUPER, "hfsplus_sync_fs\n"); 185 186 /* 187 * Explicitly write out the special metadata inodes. 188 * 189 * While these special inodes are marked as hashed and written 190 * out peridocically by the flusher threads we redirty them 191 * during writeout of normal inodes, and thus the life lock 192 * prevents us from getting the latest state to disk. 193 */ 194 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping); 195 error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping); 196 if (!error) 197 error = error2; 198 if (sbi->attr_tree) { 199 error2 = 200 filemap_write_and_wait(sbi->attr_tree->inode->i_mapping); 201 if (!error) 202 error = error2; 203 } 204 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping); 205 if (!error) 206 error = error2; 207 208 mutex_lock(&sbi->vh_mutex); 209 mutex_lock(&sbi->alloc_mutex); 210 vhdr->free_blocks = cpu_to_be32(sbi->free_blocks); 211 vhdr->next_cnid = cpu_to_be32(sbi->next_cnid); 212 vhdr->folder_count = cpu_to_be32(sbi->folder_count); 213 vhdr->file_count = cpu_to_be32(sbi->file_count); 214 215 if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) { 216 memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr)); 217 write_backup = 1; 218 } 219 220 error2 = hfsplus_submit_bio(sb, 221 sbi->part_start + HFSPLUS_VOLHEAD_SECTOR, 222 sbi->s_vhdr_buf, NULL, WRITE_SYNC); 223 if (!error) 224 error = error2; 225 if (!write_backup) 226 goto out; 227 228 error2 = hfsplus_submit_bio(sb, 229 sbi->part_start + sbi->sect_count - 2, 230 sbi->s_backup_vhdr_buf, NULL, WRITE_SYNC); 231 if (!error) 232 error2 = error; 233 out: 234 mutex_unlock(&sbi->alloc_mutex); 235 mutex_unlock(&sbi->vh_mutex); 236 237 if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags)) 238 blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL); 239 240 return error; 241 } 242 243 static void delayed_sync_fs(struct work_struct *work) 244 { 245 int err; 246 struct hfsplus_sb_info *sbi; 247 248 sbi = container_of(work, struct hfsplus_sb_info, sync_work.work); 249 250 spin_lock(&sbi->work_lock); 251 sbi->work_queued = 0; 252 spin_unlock(&sbi->work_lock); 253 254 err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1); 255 if (err) 256 pr_err("delayed sync fs err %d\n", err); 257 } 258 259 void hfsplus_mark_mdb_dirty(struct super_block *sb) 260 { 261 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 262 unsigned long delay; 263 264 if (sb->s_flags & MS_RDONLY) 265 return; 266 267 spin_lock(&sbi->work_lock); 268 if (!sbi->work_queued) { 269 delay = msecs_to_jiffies(dirty_writeback_interval * 10); 270 queue_delayed_work(system_long_wq, &sbi->sync_work, delay); 271 sbi->work_queued = 1; 272 } 273 spin_unlock(&sbi->work_lock); 274 } 275 276 static void hfsplus_put_super(struct super_block *sb) 277 { 278 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 279 280 hfs_dbg(SUPER, "hfsplus_put_super\n"); 281 282 cancel_delayed_work_sync(&sbi->sync_work); 283 284 if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) { 285 struct hfsplus_vh *vhdr = sbi->s_vhdr; 286 287 vhdr->modify_date = hfsp_now2mt(); 288 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT); 289 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT); 290 291 hfsplus_sync_fs(sb, 1); 292 } 293 294 hfs_btree_close(sbi->attr_tree); 295 hfs_btree_close(sbi->cat_tree); 296 hfs_btree_close(sbi->ext_tree); 297 iput(sbi->alloc_file); 298 iput(sbi->hidden_dir); 299 kfree(sbi->s_vhdr_buf); 300 kfree(sbi->s_backup_vhdr_buf); 301 unload_nls(sbi->nls); 302 kfree(sb->s_fs_info); 303 sb->s_fs_info = NULL; 304 } 305 306 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf) 307 { 308 struct super_block *sb = dentry->d_sb; 309 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 310 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 311 312 buf->f_type = HFSPLUS_SUPER_MAGIC; 313 buf->f_bsize = sb->s_blocksize; 314 buf->f_blocks = sbi->total_blocks << sbi->fs_shift; 315 buf->f_bfree = sbi->free_blocks << sbi->fs_shift; 316 buf->f_bavail = buf->f_bfree; 317 buf->f_files = 0xFFFFFFFF; 318 buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid; 319 buf->f_fsid.val[0] = (u32)id; 320 buf->f_fsid.val[1] = (u32)(id >> 32); 321 buf->f_namelen = HFSPLUS_MAX_STRLEN; 322 323 return 0; 324 } 325 326 static int hfsplus_remount(struct super_block *sb, int *flags, char *data) 327 { 328 sync_filesystem(sb); 329 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 330 return 0; 331 if (!(*flags & MS_RDONLY)) { 332 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr; 333 int force = 0; 334 335 if (!hfsplus_parse_options_remount(data, &force)) 336 return -EINVAL; 337 338 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 339 pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. leaving read-only.\n"); 340 sb->s_flags |= MS_RDONLY; 341 *flags |= MS_RDONLY; 342 } else if (force) { 343 /* nothing */ 344 } else if (vhdr->attributes & 345 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 346 pr_warn("filesystem is marked locked, leaving read-only.\n"); 347 sb->s_flags |= MS_RDONLY; 348 *flags |= MS_RDONLY; 349 } else if (vhdr->attributes & 350 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) { 351 pr_warn("filesystem is marked journaled, leaving read-only.\n"); 352 sb->s_flags |= MS_RDONLY; 353 *flags |= MS_RDONLY; 354 } 355 } 356 return 0; 357 } 358 359 static const struct super_operations hfsplus_sops = { 360 .alloc_inode = hfsplus_alloc_inode, 361 .destroy_inode = hfsplus_destroy_inode, 362 .write_inode = hfsplus_write_inode, 363 .evict_inode = hfsplus_evict_inode, 364 .put_super = hfsplus_put_super, 365 .sync_fs = hfsplus_sync_fs, 366 .statfs = hfsplus_statfs, 367 .remount_fs = hfsplus_remount, 368 .show_options = hfsplus_show_options, 369 }; 370 371 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent) 372 { 373 struct hfsplus_vh *vhdr; 374 struct hfsplus_sb_info *sbi; 375 hfsplus_cat_entry entry; 376 struct hfs_find_data fd; 377 struct inode *root, *inode; 378 struct qstr str; 379 struct nls_table *nls = NULL; 380 u64 last_fs_block, last_fs_page; 381 int err; 382 383 err = -ENOMEM; 384 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 385 if (!sbi) 386 goto out; 387 388 sb->s_fs_info = sbi; 389 mutex_init(&sbi->alloc_mutex); 390 mutex_init(&sbi->vh_mutex); 391 spin_lock_init(&sbi->work_lock); 392 INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs); 393 hfsplus_fill_defaults(sbi); 394 395 err = -EINVAL; 396 if (!hfsplus_parse_options(data, sbi)) { 397 pr_err("unable to parse mount options\n"); 398 goto out_unload_nls; 399 } 400 401 /* temporarily use utf8 to correctly find the hidden dir below */ 402 nls = sbi->nls; 403 sbi->nls = load_nls("utf8"); 404 if (!sbi->nls) { 405 pr_err("unable to load nls for utf8\n"); 406 goto out_unload_nls; 407 } 408 409 /* Grab the volume header */ 410 if (hfsplus_read_wrapper(sb)) { 411 if (!silent) 412 pr_warn("unable to find HFS+ superblock\n"); 413 goto out_unload_nls; 414 } 415 vhdr = sbi->s_vhdr; 416 417 /* Copy parts of the volume header into the superblock */ 418 sb->s_magic = HFSPLUS_VOLHEAD_SIG; 419 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION || 420 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) { 421 pr_err("wrong filesystem version\n"); 422 goto out_free_vhdr; 423 } 424 sbi->total_blocks = be32_to_cpu(vhdr->total_blocks); 425 sbi->free_blocks = be32_to_cpu(vhdr->free_blocks); 426 sbi->next_cnid = be32_to_cpu(vhdr->next_cnid); 427 sbi->file_count = be32_to_cpu(vhdr->file_count); 428 sbi->folder_count = be32_to_cpu(vhdr->folder_count); 429 sbi->data_clump_blocks = 430 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift; 431 if (!sbi->data_clump_blocks) 432 sbi->data_clump_blocks = 1; 433 sbi->rsrc_clump_blocks = 434 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift; 435 if (!sbi->rsrc_clump_blocks) 436 sbi->rsrc_clump_blocks = 1; 437 438 err = -EFBIG; 439 last_fs_block = sbi->total_blocks - 1; 440 last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >> 441 PAGE_CACHE_SHIFT; 442 443 if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) || 444 (last_fs_page > (pgoff_t)(~0ULL))) { 445 pr_err("filesystem size too large\n"); 446 goto out_free_vhdr; 447 } 448 449 /* Set up operations so we can load metadata */ 450 sb->s_op = &hfsplus_sops; 451 sb->s_maxbytes = MAX_LFS_FILESIZE; 452 453 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 454 pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. mounting read-only.\n"); 455 sb->s_flags |= MS_RDONLY; 456 } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) { 457 /* nothing */ 458 } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 459 pr_warn("Filesystem is marked locked, mounting read-only.\n"); 460 sb->s_flags |= MS_RDONLY; 461 } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) && 462 !(sb->s_flags & MS_RDONLY)) { 463 pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, 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 pr_err("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 pr_err("failed to load catalog file\n"); 478 goto out_close_ext_tree; 479 } 480 atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE); 481 if (vhdr->attr_file.total_blocks != 0) { 482 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID); 483 if (!sbi->attr_tree) { 484 pr_err("failed to load attributes file\n"); 485 goto out_close_cat_tree; 486 } 487 atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE); 488 } 489 sb->s_xattr = hfsplus_xattr_handlers; 490 491 inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID); 492 if (IS_ERR(inode)) { 493 pr_err("failed to load allocation file\n"); 494 err = PTR_ERR(inode); 495 goto out_close_attr_tree; 496 } 497 sbi->alloc_file = inode; 498 499 /* Load the root directory */ 500 root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID); 501 if (IS_ERR(root)) { 502 pr_err("failed to load root directory\n"); 503 err = PTR_ERR(root); 504 goto out_put_alloc_file; 505 } 506 507 sb->s_d_op = &hfsplus_dentry_operations; 508 sb->s_root = d_make_root(root); 509 if (!sb->s_root) { 510 err = -ENOMEM; 511 goto out_put_alloc_file; 512 } 513 514 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1; 515 str.name = HFSP_HIDDENDIR_NAME; 516 err = hfs_find_init(sbi->cat_tree, &fd); 517 if (err) 518 goto out_put_root; 519 err = hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str); 520 if (unlikely(err < 0)) 521 goto out_put_root; 522 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) { 523 hfs_find_exit(&fd); 524 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) 525 goto out_put_root; 526 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id)); 527 if (IS_ERR(inode)) { 528 err = PTR_ERR(inode); 529 goto out_put_root; 530 } 531 sbi->hidden_dir = inode; 532 } else 533 hfs_find_exit(&fd); 534 535 if (!(sb->s_flags & MS_RDONLY)) { 536 /* 537 * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused 538 * all three are registered with Apple for our use 539 */ 540 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION); 541 vhdr->modify_date = hfsp_now2mt(); 542 be32_add_cpu(&vhdr->write_count, 1); 543 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT); 544 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT); 545 hfsplus_sync_fs(sb, 1); 546 547 if (!sbi->hidden_dir) { 548 mutex_lock(&sbi->vh_mutex); 549 sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR); 550 if (!sbi->hidden_dir) { 551 mutex_unlock(&sbi->vh_mutex); 552 err = -ENOMEM; 553 goto out_put_root; 554 } 555 err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root, 556 &str, sbi->hidden_dir); 557 if (err) { 558 mutex_unlock(&sbi->vh_mutex); 559 goto out_put_hidden_dir; 560 } 561 562 err = hfsplus_init_inode_security(sbi->hidden_dir, 563 root, &str); 564 if (err == -EOPNOTSUPP) 565 err = 0; /* Operation is not supported. */ 566 else if (err) { 567 /* 568 * Try to delete anyway without 569 * error analysis. 570 */ 571 hfsplus_delete_cat(sbi->hidden_dir->i_ino, 572 root, &str); 573 mutex_unlock(&sbi->vh_mutex); 574 goto out_put_hidden_dir; 575 } 576 577 mutex_unlock(&sbi->vh_mutex); 578 hfsplus_mark_inode_dirty(sbi->hidden_dir, 579 HFSPLUS_I_CAT_DIRTY); 580 } 581 } 582 583 unload_nls(sbi->nls); 584 sbi->nls = nls; 585 return 0; 586 587 out_put_hidden_dir: 588 iput(sbi->hidden_dir); 589 out_put_root: 590 dput(sb->s_root); 591 sb->s_root = NULL; 592 out_put_alloc_file: 593 iput(sbi->alloc_file); 594 out_close_attr_tree: 595 hfs_btree_close(sbi->attr_tree); 596 out_close_cat_tree: 597 hfs_btree_close(sbi->cat_tree); 598 out_close_ext_tree: 599 hfs_btree_close(sbi->ext_tree); 600 out_free_vhdr: 601 kfree(sbi->s_vhdr_buf); 602 kfree(sbi->s_backup_vhdr_buf); 603 out_unload_nls: 604 unload_nls(sbi->nls); 605 unload_nls(nls); 606 kfree(sbi); 607 out: 608 return err; 609 } 610 611 MODULE_AUTHOR("Brad Boyer"); 612 MODULE_DESCRIPTION("Extended Macintosh Filesystem"); 613 MODULE_LICENSE("GPL"); 614 615 static struct kmem_cache *hfsplus_inode_cachep; 616 617 static struct inode *hfsplus_alloc_inode(struct super_block *sb) 618 { 619 struct hfsplus_inode_info *i; 620 621 i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL); 622 return i ? &i->vfs_inode : NULL; 623 } 624 625 static void hfsplus_i_callback(struct rcu_head *head) 626 { 627 struct inode *inode = container_of(head, struct inode, i_rcu); 628 629 kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode)); 630 } 631 632 static void hfsplus_destroy_inode(struct inode *inode) 633 { 634 call_rcu(&inode->i_rcu, hfsplus_i_callback); 635 } 636 637 #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info) 638 639 static struct dentry *hfsplus_mount(struct file_system_type *fs_type, 640 int flags, const char *dev_name, void *data) 641 { 642 return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super); 643 } 644 645 static struct file_system_type hfsplus_fs_type = { 646 .owner = THIS_MODULE, 647 .name = "hfsplus", 648 .mount = hfsplus_mount, 649 .kill_sb = kill_block_super, 650 .fs_flags = FS_REQUIRES_DEV, 651 }; 652 MODULE_ALIAS_FS("hfsplus"); 653 654 static void hfsplus_init_once(void *p) 655 { 656 struct hfsplus_inode_info *i = p; 657 658 inode_init_once(&i->vfs_inode); 659 } 660 661 static int __init init_hfsplus_fs(void) 662 { 663 int err; 664 665 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache", 666 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT, 667 hfsplus_init_once); 668 if (!hfsplus_inode_cachep) 669 return -ENOMEM; 670 err = hfsplus_create_attr_tree_cache(); 671 if (err) 672 goto destroy_inode_cache; 673 err = register_filesystem(&hfsplus_fs_type); 674 if (err) 675 goto destroy_attr_tree_cache; 676 return 0; 677 678 destroy_attr_tree_cache: 679 hfsplus_destroy_attr_tree_cache(); 680 681 destroy_inode_cache: 682 kmem_cache_destroy(hfsplus_inode_cachep); 683 684 return err; 685 } 686 687 static void __exit exit_hfsplus_fs(void) 688 { 689 unregister_filesystem(&hfsplus_fs_type); 690 691 /* 692 * Make sure all delayed rcu free inodes are flushed before we 693 * destroy cache. 694 */ 695 rcu_barrier(); 696 hfsplus_destroy_attr_tree_cache(); 697 kmem_cache_destroy(hfsplus_inode_cachep); 698 } 699 700 module_init(init_hfsplus_fs) 701 module_exit(exit_hfsplus_fs) 702