fs/hfsplus/super.c

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