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 #include "xattr.h" 24 25 static int hfsplus_system_read_inode(struct inode *inode) 26 { 27 struct hfsplus_vh *vhdr = HFSPLUS_SB(inode->i_sb)->s_vhdr; 28 29 switch (inode->i_ino) { 30 case HFSPLUS_EXT_CNID: 31 hfsplus_inode_read_fork(inode, &vhdr->ext_file); 32 inode->i_mapping->a_ops = &hfsplus_btree_aops; 33 break; 34 case HFSPLUS_CAT_CNID: 35 hfsplus_inode_read_fork(inode, &vhdr->cat_file); 36 inode->i_mapping->a_ops = &hfsplus_btree_aops; 37 break; 38 case HFSPLUS_ALLOC_CNID: 39 hfsplus_inode_read_fork(inode, &vhdr->alloc_file); 40 inode->i_mapping->a_ops = &hfsplus_aops; 41 break; 42 case HFSPLUS_START_CNID: 43 hfsplus_inode_read_fork(inode, &vhdr->start_file); 44 break; 45 case HFSPLUS_ATTR_CNID: 46 hfsplus_inode_read_fork(inode, &vhdr->attr_file); 47 inode->i_mapping->a_ops = &hfsplus_btree_aops; 48 break; 49 default: 50 return -EIO; 51 } 52 53 return 0; 54 } 55 56 struct inode *hfsplus_iget(struct super_block *sb, unsigned long ino) 57 { 58 struct hfs_find_data fd; 59 struct inode *inode; 60 int err; 61 62 inode = iget_locked(sb, ino); 63 if (!inode) 64 return ERR_PTR(-ENOMEM); 65 if (!(inode->i_state & I_NEW)) 66 return inode; 67 68 INIT_LIST_HEAD(&HFSPLUS_I(inode)->open_dir_list); 69 mutex_init(&HFSPLUS_I(inode)->extents_lock); 70 HFSPLUS_I(inode)->flags = 0; 71 HFSPLUS_I(inode)->extent_state = 0; 72 HFSPLUS_I(inode)->rsrc_inode = NULL; 73 atomic_set(&HFSPLUS_I(inode)->opencnt, 0); 74 75 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || 76 inode->i_ino == HFSPLUS_ROOT_CNID) { 77 err = hfs_find_init(HFSPLUS_SB(inode->i_sb)->cat_tree, &fd); 78 if (!err) { 79 err = hfsplus_find_cat(inode->i_sb, inode->i_ino, &fd); 80 if (!err) 81 err = hfsplus_cat_read_inode(inode, &fd); 82 hfs_find_exit(&fd); 83 } 84 } else { 85 err = hfsplus_system_read_inode(inode); 86 } 87 88 if (err) { 89 iget_failed(inode); 90 return ERR_PTR(err); 91 } 92 93 unlock_new_inode(inode); 94 return inode; 95 } 96 97 static int hfsplus_system_write_inode(struct inode *inode) 98 { 99 struct hfsplus_sb_info *sbi = HFSPLUS_SB(inode->i_sb); 100 struct hfsplus_vh *vhdr = sbi->s_vhdr; 101 struct hfsplus_fork_raw *fork; 102 struct hfs_btree *tree = NULL; 103 104 switch (inode->i_ino) { 105 case HFSPLUS_EXT_CNID: 106 fork = &vhdr->ext_file; 107 tree = sbi->ext_tree; 108 break; 109 case HFSPLUS_CAT_CNID: 110 fork = &vhdr->cat_file; 111 tree = sbi->cat_tree; 112 break; 113 case HFSPLUS_ALLOC_CNID: 114 fork = &vhdr->alloc_file; 115 break; 116 case HFSPLUS_START_CNID: 117 fork = &vhdr->start_file; 118 break; 119 case HFSPLUS_ATTR_CNID: 120 fork = &vhdr->attr_file; 121 tree = sbi->attr_tree; 122 break; 123 default: 124 return -EIO; 125 } 126 127 if (fork->total_size != cpu_to_be64(inode->i_size)) { 128 set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags); 129 hfsplus_mark_mdb_dirty(inode->i_sb); 130 } 131 hfsplus_inode_write_fork(inode, fork); 132 if (tree) { 133 int err = hfs_btree_write(tree); 134 if (err) { 135 pr_err("b-tree write err: %d, ino %lu\n", 136 err, inode->i_ino); 137 return err; 138 } 139 } 140 return 0; 141 } 142 143 static int hfsplus_write_inode(struct inode *inode, 144 struct writeback_control *wbc) 145 { 146 int err; 147 148 hfs_dbg(INODE, "hfsplus_write_inode: %lu\n", inode->i_ino); 149 150 err = hfsplus_ext_write_extent(inode); 151 if (err) 152 return err; 153 154 if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID || 155 inode->i_ino == HFSPLUS_ROOT_CNID) 156 return hfsplus_cat_write_inode(inode); 157 else 158 return hfsplus_system_write_inode(inode); 159 } 160 161 static void hfsplus_evict_inode(struct inode *inode) 162 { 163 hfs_dbg(INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino); 164 truncate_inode_pages(&inode->i_data, 0); 165 clear_inode(inode); 166 if (HFSPLUS_IS_RSRC(inode)) { 167 HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL; 168 iput(HFSPLUS_I(inode)->rsrc_inode); 169 } 170 } 171 172 static int hfsplus_sync_fs(struct super_block *sb, int wait) 173 { 174 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 175 struct hfsplus_vh *vhdr = sbi->s_vhdr; 176 int write_backup = 0; 177 int error, error2; 178 179 if (!wait) 180 return 0; 181 182 hfs_dbg(SUPER, "hfsplus_sync_fs\n"); 183 184 /* 185 * Explicitly write out the special metadata inodes. 186 * 187 * While these special inodes are marked as hashed and written 188 * out peridocically by the flusher threads we redirty them 189 * during writeout of normal inodes, and thus the life lock 190 * prevents us from getting the latest state to disk. 191 */ 192 error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping); 193 error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping); 194 if (!error) 195 error = error2; 196 if (sbi->attr_tree) { 197 error2 = 198 filemap_write_and_wait(sbi->attr_tree->inode->i_mapping); 199 if (!error) 200 error = error2; 201 } 202 error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping); 203 if (!error) 204 error = error2; 205 206 mutex_lock(&sbi->vh_mutex); 207 mutex_lock(&sbi->alloc_mutex); 208 vhdr->free_blocks = cpu_to_be32(sbi->free_blocks); 209 vhdr->next_cnid = cpu_to_be32(sbi->next_cnid); 210 vhdr->folder_count = cpu_to_be32(sbi->folder_count); 211 vhdr->file_count = cpu_to_be32(sbi->file_count); 212 213 if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) { 214 memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr)); 215 write_backup = 1; 216 } 217 218 error2 = hfsplus_submit_bio(sb, 219 sbi->part_start + HFSPLUS_VOLHEAD_SECTOR, 220 sbi->s_vhdr_buf, NULL, WRITE_SYNC); 221 if (!error) 222 error = error2; 223 if (!write_backup) 224 goto out; 225 226 error2 = hfsplus_submit_bio(sb, 227 sbi->part_start + sbi->sect_count - 2, 228 sbi->s_backup_vhdr_buf, NULL, WRITE_SYNC); 229 if (!error) 230 error2 = error; 231 out: 232 mutex_unlock(&sbi->alloc_mutex); 233 mutex_unlock(&sbi->vh_mutex); 234 235 if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags)) 236 blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL); 237 238 return error; 239 } 240 241 static void delayed_sync_fs(struct work_struct *work) 242 { 243 int err; 244 struct hfsplus_sb_info *sbi; 245 246 sbi = container_of(work, struct hfsplus_sb_info, sync_work.work); 247 248 spin_lock(&sbi->work_lock); 249 sbi->work_queued = 0; 250 spin_unlock(&sbi->work_lock); 251 252 err = hfsplus_sync_fs(sbi->alloc_file->i_sb, 1); 253 if (err) 254 pr_err("delayed sync fs err %d\n", err); 255 } 256 257 void hfsplus_mark_mdb_dirty(struct super_block *sb) 258 { 259 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 260 unsigned long delay; 261 262 if (sb->s_flags & MS_RDONLY) 263 return; 264 265 spin_lock(&sbi->work_lock); 266 if (!sbi->work_queued) { 267 delay = msecs_to_jiffies(dirty_writeback_interval * 10); 268 queue_delayed_work(system_long_wq, &sbi->sync_work, delay); 269 sbi->work_queued = 1; 270 } 271 spin_unlock(&sbi->work_lock); 272 } 273 274 static void hfsplus_put_super(struct super_block *sb) 275 { 276 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 277 278 hfs_dbg(SUPER, "hfsplus_put_super\n"); 279 280 cancel_delayed_work_sync(&sbi->sync_work); 281 282 if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) { 283 struct hfsplus_vh *vhdr = sbi->s_vhdr; 284 285 vhdr->modify_date = hfsp_now2mt(); 286 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT); 287 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT); 288 289 hfsplus_sync_fs(sb, 1); 290 } 291 292 hfs_btree_close(sbi->attr_tree); 293 hfs_btree_close(sbi->cat_tree); 294 hfs_btree_close(sbi->ext_tree); 295 iput(sbi->alloc_file); 296 iput(sbi->hidden_dir); 297 kfree(sbi->s_vhdr_buf); 298 kfree(sbi->s_backup_vhdr_buf); 299 unload_nls(sbi->nls); 300 kfree(sb->s_fs_info); 301 sb->s_fs_info = NULL; 302 } 303 304 static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf) 305 { 306 struct super_block *sb = dentry->d_sb; 307 struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb); 308 u64 id = huge_encode_dev(sb->s_bdev->bd_dev); 309 310 buf->f_type = HFSPLUS_SUPER_MAGIC; 311 buf->f_bsize = sb->s_blocksize; 312 buf->f_blocks = sbi->total_blocks << sbi->fs_shift; 313 buf->f_bfree = sbi->free_blocks << sbi->fs_shift; 314 buf->f_bavail = buf->f_bfree; 315 buf->f_files = 0xFFFFFFFF; 316 buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid; 317 buf->f_fsid.val[0] = (u32)id; 318 buf->f_fsid.val[1] = (u32)(id >> 32); 319 buf->f_namelen = HFSPLUS_MAX_STRLEN; 320 321 return 0; 322 } 323 324 static int hfsplus_remount(struct super_block *sb, int *flags, char *data) 325 { 326 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) 327 return 0; 328 if (!(*flags & MS_RDONLY)) { 329 struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr; 330 int force = 0; 331 332 if (!hfsplus_parse_options_remount(data, &force)) 333 return -EINVAL; 334 335 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 336 pr_warn("filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. leaving read-only.\n"); 337 sb->s_flags |= MS_RDONLY; 338 *flags |= MS_RDONLY; 339 } else if (force) { 340 /* nothing */ 341 } else if (vhdr->attributes & 342 cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) { 343 pr_warn("filesystem is marked locked, leaving read-only.\n"); 344 sb->s_flags |= MS_RDONLY; 345 *flags |= MS_RDONLY; 346 } else if (vhdr->attributes & 347 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) { 348 pr_warn("filesystem is marked journaled, leaving read-only.\n"); 349 sb->s_flags |= MS_RDONLY; 350 *flags |= MS_RDONLY; 351 } 352 } 353 return 0; 354 } 355 356 static const struct super_operations hfsplus_sops = { 357 .alloc_inode = hfsplus_alloc_inode, 358 .destroy_inode = hfsplus_destroy_inode, 359 .write_inode = hfsplus_write_inode, 360 .evict_inode = hfsplus_evict_inode, 361 .put_super = hfsplus_put_super, 362 .sync_fs = hfsplus_sync_fs, 363 .statfs = hfsplus_statfs, 364 .remount_fs = hfsplus_remount, 365 .show_options = hfsplus_show_options, 366 }; 367 368 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent) 369 { 370 struct hfsplus_vh *vhdr; 371 struct hfsplus_sb_info *sbi; 372 hfsplus_cat_entry entry; 373 struct hfs_find_data fd; 374 struct inode *root, *inode; 375 struct qstr str; 376 struct nls_table *nls = NULL; 377 u64 last_fs_block, last_fs_page; 378 int err; 379 380 err = -ENOMEM; 381 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); 382 if (!sbi) 383 goto out; 384 385 sb->s_fs_info = sbi; 386 mutex_init(&sbi->alloc_mutex); 387 mutex_init(&sbi->vh_mutex); 388 spin_lock_init(&sbi->work_lock); 389 INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs); 390 hfsplus_fill_defaults(sbi); 391 392 err = -EINVAL; 393 if (!hfsplus_parse_options(data, sbi)) { 394 pr_err("unable to parse mount options\n"); 395 goto out_unload_nls; 396 } 397 398 /* temporarily use utf8 to correctly find the hidden dir below */ 399 nls = sbi->nls; 400 sbi->nls = load_nls("utf8"); 401 if (!sbi->nls) { 402 pr_err("unable to load nls for utf8\n"); 403 goto out_unload_nls; 404 } 405 406 /* Grab the volume header */ 407 if (hfsplus_read_wrapper(sb)) { 408 if (!silent) 409 pr_warn("unable to find HFS+ superblock\n"); 410 goto out_unload_nls; 411 } 412 vhdr = sbi->s_vhdr; 413 414 /* Copy parts of the volume header into the superblock */ 415 sb->s_magic = HFSPLUS_VOLHEAD_SIG; 416 if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION || 417 be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) { 418 pr_err("wrong filesystem version\n"); 419 goto out_free_vhdr; 420 } 421 sbi->total_blocks = be32_to_cpu(vhdr->total_blocks); 422 sbi->free_blocks = be32_to_cpu(vhdr->free_blocks); 423 sbi->next_cnid = be32_to_cpu(vhdr->next_cnid); 424 sbi->file_count = be32_to_cpu(vhdr->file_count); 425 sbi->folder_count = be32_to_cpu(vhdr->folder_count); 426 sbi->data_clump_blocks = 427 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift; 428 if (!sbi->data_clump_blocks) 429 sbi->data_clump_blocks = 1; 430 sbi->rsrc_clump_blocks = 431 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift; 432 if (!sbi->rsrc_clump_blocks) 433 sbi->rsrc_clump_blocks = 1; 434 435 err = -EFBIG; 436 last_fs_block = sbi->total_blocks - 1; 437 last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >> 438 PAGE_CACHE_SHIFT; 439 440 if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) || 441 (last_fs_page > (pgoff_t)(~0ULL))) { 442 pr_err("filesystem size too large\n"); 443 goto out_free_vhdr; 444 } 445 446 /* Set up operations so we can load metadata */ 447 sb->s_op = &hfsplus_sops; 448 sb->s_maxbytes = MAX_LFS_FILESIZE; 449 450 if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) { 451 pr_warn("Filesystem was not cleanly unmounted, running fsck.hfsplus is recommended. 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 pr_warn("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 pr_warn("write access to a journaled filesystem is not supported, use the force option at your own risk, mounting read-only.\n"); 461 sb->s_flags |= MS_RDONLY; 462 } 463 464 err = -EINVAL; 465 466 /* Load metadata objects (B*Trees) */ 467 sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID); 468 if (!sbi->ext_tree) { 469 pr_err("failed to load extents file\n"); 470 goto out_free_vhdr; 471 } 472 sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID); 473 if (!sbi->cat_tree) { 474 pr_err("failed to load catalog file\n"); 475 goto out_close_ext_tree; 476 } 477 atomic_set(&sbi->attr_tree_state, HFSPLUS_EMPTY_ATTR_TREE); 478 if (vhdr->attr_file.total_blocks != 0) { 479 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID); 480 if (!sbi->attr_tree) { 481 pr_err("failed to load attributes file\n"); 482 goto out_close_cat_tree; 483 } 484 atomic_set(&sbi->attr_tree_state, HFSPLUS_VALID_ATTR_TREE); 485 } 486 sb->s_xattr = hfsplus_xattr_handlers; 487 488 inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID); 489 if (IS_ERR(inode)) { 490 pr_err("failed to load allocation file\n"); 491 err = PTR_ERR(inode); 492 goto out_close_attr_tree; 493 } 494 sbi->alloc_file = inode; 495 496 /* Load the root directory */ 497 root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID); 498 if (IS_ERR(root)) { 499 pr_err("failed to load root directory\n"); 500 err = PTR_ERR(root); 501 goto out_put_alloc_file; 502 } 503 504 sb->s_d_op = &hfsplus_dentry_operations; 505 sb->s_root = d_make_root(root); 506 if (!sb->s_root) { 507 err = -ENOMEM; 508 goto out_put_alloc_file; 509 } 510 511 str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1; 512 str.name = HFSP_HIDDENDIR_NAME; 513 err = hfs_find_init(sbi->cat_tree, &fd); 514 if (err) 515 goto out_put_root; 516 hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str); 517 if (!hfs_brec_read(&fd, &entry, sizeof(entry))) { 518 hfs_find_exit(&fd); 519 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER)) 520 goto out_put_root; 521 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id)); 522 if (IS_ERR(inode)) { 523 err = PTR_ERR(inode); 524 goto out_put_root; 525 } 526 sbi->hidden_dir = inode; 527 } else 528 hfs_find_exit(&fd); 529 530 if (!(sb->s_flags & MS_RDONLY)) { 531 /* 532 * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused 533 * all three are registered with Apple for our use 534 */ 535 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION); 536 vhdr->modify_date = hfsp_now2mt(); 537 be32_add_cpu(&vhdr->write_count, 1); 538 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT); 539 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT); 540 hfsplus_sync_fs(sb, 1); 541 542 if (!sbi->hidden_dir) { 543 mutex_lock(&sbi->vh_mutex); 544 sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR); 545 if (!sbi->hidden_dir) { 546 mutex_unlock(&sbi->vh_mutex); 547 err = -ENOMEM; 548 goto out_put_root; 549 } 550 err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root, 551 &str, sbi->hidden_dir); 552 if (err) { 553 mutex_unlock(&sbi->vh_mutex); 554 goto out_put_hidden_dir; 555 } 556 557 err = hfsplus_init_inode_security(sbi->hidden_dir, 558 root, &str); 559 if (err == -EOPNOTSUPP) 560 err = 0; /* Operation is not supported. */ 561 else if (err) { 562 /* 563 * Try to delete anyway without 564 * error analysis. 565 */ 566 hfsplus_delete_cat(sbi->hidden_dir->i_ino, 567 root, &str); 568 mutex_unlock(&sbi->vh_mutex); 569 goto out_put_hidden_dir; 570 } 571 572 mutex_unlock(&sbi->vh_mutex); 573 hfsplus_mark_inode_dirty(sbi->hidden_dir, 574 HFSPLUS_I_CAT_DIRTY); 575 } 576 } 577 578 unload_nls(sbi->nls); 579 sbi->nls = nls; 580 return 0; 581 582 out_put_hidden_dir: 583 iput(sbi->hidden_dir); 584 out_put_root: 585 dput(sb->s_root); 586 sb->s_root = NULL; 587 out_put_alloc_file: 588 iput(sbi->alloc_file); 589 out_close_attr_tree: 590 hfs_btree_close(sbi->attr_tree); 591 out_close_cat_tree: 592 hfs_btree_close(sbi->cat_tree); 593 out_close_ext_tree: 594 hfs_btree_close(sbi->ext_tree); 595 out_free_vhdr: 596 kfree(sbi->s_vhdr_buf); 597 kfree(sbi->s_backup_vhdr_buf); 598 out_unload_nls: 599 unload_nls(sbi->nls); 600 unload_nls(nls); 601 kfree(sbi); 602 out: 603 return err; 604 } 605 606 MODULE_AUTHOR("Brad Boyer"); 607 MODULE_DESCRIPTION("Extended Macintosh Filesystem"); 608 MODULE_LICENSE("GPL"); 609 610 static struct kmem_cache *hfsplus_inode_cachep; 611 612 static struct inode *hfsplus_alloc_inode(struct super_block *sb) 613 { 614 struct hfsplus_inode_info *i; 615 616 i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL); 617 return i ? &i->vfs_inode : NULL; 618 } 619 620 static void hfsplus_i_callback(struct rcu_head *head) 621 { 622 struct inode *inode = container_of(head, struct inode, i_rcu); 623 624 kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode)); 625 } 626 627 static void hfsplus_destroy_inode(struct inode *inode) 628 { 629 call_rcu(&inode->i_rcu, hfsplus_i_callback); 630 } 631 632 #define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info) 633 634 static struct dentry *hfsplus_mount(struct file_system_type *fs_type, 635 int flags, const char *dev_name, void *data) 636 { 637 return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super); 638 } 639 640 static struct file_system_type hfsplus_fs_type = { 641 .owner = THIS_MODULE, 642 .name = "hfsplus", 643 .mount = hfsplus_mount, 644 .kill_sb = kill_block_super, 645 .fs_flags = FS_REQUIRES_DEV, 646 }; 647 MODULE_ALIAS_FS("hfsplus"); 648 649 static void hfsplus_init_once(void *p) 650 { 651 struct hfsplus_inode_info *i = p; 652 653 inode_init_once(&i->vfs_inode); 654 } 655 656 static int __init init_hfsplus_fs(void) 657 { 658 int err; 659 660 hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache", 661 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN, 662 hfsplus_init_once); 663 if (!hfsplus_inode_cachep) 664 return -ENOMEM; 665 err = hfsplus_create_attr_tree_cache(); 666 if (err) 667 goto destroy_inode_cache; 668 err = register_filesystem(&hfsplus_fs_type); 669 if (err) 670 goto destroy_attr_tree_cache; 671 return 0; 672 673 destroy_attr_tree_cache: 674 hfsplus_destroy_attr_tree_cache(); 675 676 destroy_inode_cache: 677 kmem_cache_destroy(hfsplus_inode_cachep); 678 679 return err; 680 } 681 682 static void __exit exit_hfsplus_fs(void) 683 { 684 unregister_filesystem(&hfsplus_fs_type); 685 686 /* 687 * Make sure all delayed rcu free inodes are flushed before we 688 * destroy cache. 689 */ 690 rcu_barrier(); 691 hfsplus_destroy_attr_tree_cache(); 692 kmem_cache_destroy(hfsplus_inode_cachep); 693 } 694 695 module_init(init_hfsplus_fs) 696 module_exit(exit_hfsplus_fs) 697