Pileus Git - ~andy/linux/blob - 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 #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                         printk(KERN_ERR "hfs: 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         dprint(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         dprint(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         dprint(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                 printk(KERN_ERR "hfs: 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         dprint(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                         printk(KERN_WARNING "hfs: filesystem was "
 337                                         "not cleanly unmounted, "
 338                                         "running fsck.hfsplus is recommended.  "
 339                                         "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                         printk(KERN_WARNING "hfs: filesystem is marked locked, "
 347                                         "leaving read-only.\n");
 348                         sb->s_flags |= MS_RDONLY;
 349                         *flags |= MS_RDONLY;
 350                 } else if (vhdr->attributes &
 351                                 cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
 352                         printk(KERN_WARNING "hfs: filesystem is "
 353                                         "marked journaled, "
 354                                         "leaving read-only.\n");
 355                         sb->s_flags |= MS_RDONLY;
 356                         *flags |= MS_RDONLY;
 357                 }
 358         }
 359         return 0;
 360 }
 361
 362 static const struct super_operations hfsplus_sops = {
 363         .alloc_inode    = hfsplus_alloc_inode,
 364         .destroy_inode  = hfsplus_destroy_inode,
 365         .write_inode    = hfsplus_write_inode,
 366         .evict_inode    = hfsplus_evict_inode,
 367         .put_super      = hfsplus_put_super,
 368         .sync_fs        = hfsplus_sync_fs,
 369         .statfs         = hfsplus_statfs,
 370         .remount_fs     = hfsplus_remount,
 371         .show_options   = hfsplus_show_options,
 372 };
 373
 374 static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
 375 {
 376         struct hfsplus_vh *vhdr;
 377         struct hfsplus_sb_info *sbi;
 378         hfsplus_cat_entry entry;
 379         struct hfs_find_data fd;
 380         struct inode *root, *inode;
 381         struct qstr str;
 382         struct nls_table *nls = NULL;
 383         u64 last_fs_block, last_fs_page;
 384         int err;
 385
 386         err = -ENOMEM;
 387         sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 388         if (!sbi)
 389                 goto out;
 390
 391         sb->s_fs_info = sbi;
 392         mutex_init(&sbi->alloc_mutex);
 393         mutex_init(&sbi->vh_mutex);
 394         spin_lock_init(&sbi->work_lock);
 395         INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
 396         hfsplus_fill_defaults(sbi);
 397
 398         err = -EINVAL;
 399         if (!hfsplus_parse_options(data, sbi)) {
 400                 printk(KERN_ERR "hfs: unable to parse mount options\n");
 401                 goto out_unload_nls;
 402         }
 403
 404         /* temporarily use utf8 to correctly find the hidden dir below */
 405         nls = sbi->nls;
 406         sbi->nls = load_nls("utf8");
 407         if (!sbi->nls) {
 408                 printk(KERN_ERR "hfs: unable to load nls for utf8\n");
 409                 goto out_unload_nls;
 410         }
 411
 412         /* Grab the volume header */
 413         if (hfsplus_read_wrapper(sb)) {
 414                 if (!silent)
 415                         printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
 416                 goto out_unload_nls;
 417         }
 418         vhdr = sbi->s_vhdr;
 419
 420         /* Copy parts of the volume header into the superblock */
 421         sb->s_magic = HFSPLUS_VOLHEAD_SIG;
 422         if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
 423             be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
 424                 printk(KERN_ERR "hfs: wrong filesystem version\n");
 425                 goto out_free_vhdr;
 426         }
 427         sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
 428         sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
 429         sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
 430         sbi->file_count = be32_to_cpu(vhdr->file_count);
 431         sbi->folder_count = be32_to_cpu(vhdr->folder_count);
 432         sbi->data_clump_blocks =
 433                 be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
 434         if (!sbi->data_clump_blocks)
 435                 sbi->data_clump_blocks = 1;
 436         sbi->rsrc_clump_blocks =
 437                 be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
 438         if (!sbi->rsrc_clump_blocks)
 439                 sbi->rsrc_clump_blocks = 1;
 440
 441         err = -EFBIG;
 442         last_fs_block = sbi->total_blocks - 1;
 443         last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
 444                         PAGE_CACHE_SHIFT;
 445
 446         if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
 447             (last_fs_page > (pgoff_t)(~0ULL))) {
 448                 printk(KERN_ERR "hfs: filesystem size too large.\n");
 449                 goto out_free_vhdr;
 450         }
 451
 452         /* Set up operations so we can load metadata */
 453         sb->s_op = &hfsplus_sops;
 454         sb->s_maxbytes = MAX_LFS_FILESIZE;
 455
 456         if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 457                 printk(KERN_WARNING "hfs: Filesystem was "
 458                                 "not cleanly unmounted, "
 459                                 "running fsck.hfsplus is recommended.  "
 460                                 "mounting read-only.\n");
 461                 sb->s_flags |= MS_RDONLY;
 462         } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
 463                 /* nothing */
 464         } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 465                 printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
 466                 sb->s_flags |= MS_RDONLY;
 467         } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
 468                         !(sb->s_flags & MS_RDONLY)) {
 469                 printk(KERN_WARNING "hfs: write access to "
 470                                 "a journaled filesystem is not supported, "
 471                                 "use the force option at your own risk, "
 472                                 "mounting read-only.\n");
 473                 sb->s_flags |= MS_RDONLY;
 474         }
 475
 476         err = -EINVAL;
 477
 478         /* Load metadata objects (B*Trees) */
 479         sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
 480         if (!sbi->ext_tree) {
 481                 printk(KERN_ERR "hfs: failed to load extents file\n");
 482                 goto out_free_vhdr;
 483         }
 484         sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
 485         if (!sbi->cat_tree) {
 486                 printk(KERN_ERR "hfs: failed to load catalog file\n");
 487                 goto out_close_ext_tree;
 488         }
 489         if (vhdr->attr_file.total_blocks != 0) {
 490                 sbi->attr_tree = hfs_btree_open(sb, HFSPLUS_ATTR_CNID);
 491                 if (!sbi->attr_tree) {
 492                         printk(KERN_ERR "hfs: failed to load attributes file\n");
 493                         goto out_close_cat_tree;
 494                 }
 495         }
 496         sb->s_xattr = hfsplus_xattr_handlers;
 497
 498         inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
 499         if (IS_ERR(inode)) {
 500                 printk(KERN_ERR "hfs: failed to load allocation file\n");
 501                 err = PTR_ERR(inode);
 502                 goto out_close_attr_tree;
 503         }
 504         sbi->alloc_file = inode;
 505
 506         /* Load the root directory */
 507         root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
 508         if (IS_ERR(root)) {
 509                 printk(KERN_ERR "hfs: failed to load root directory\n");
 510                 err = PTR_ERR(root);
 511                 goto out_put_alloc_file;
 512         }
 513
 514         sb->s_d_op = &hfsplus_dentry_operations;
 515         sb->s_root = d_make_root(root);
 516         if (!sb->s_root) {
 517                 err = -ENOMEM;
 518                 goto out_put_alloc_file;
 519         }
 520
 521         str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
 522         str.name = HFSP_HIDDENDIR_NAME;
 523         err = hfs_find_init(sbi->cat_tree, &fd);
 524         if (err)
 525                 goto out_put_root;
 526         hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
 527         if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
 528                 hfs_find_exit(&fd);
 529                 if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
 530                         goto out_put_root;
 531                 inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
 532                 if (IS_ERR(inode)) {
 533                         err = PTR_ERR(inode);
 534                         goto out_put_root;
 535                 }
 536                 sbi->hidden_dir = inode;
 537         } else
 538                 hfs_find_exit(&fd);
 539
 540         if (!(sb->s_flags & MS_RDONLY)) {
 541                 /*
 542                  * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
 543                  * all three are registered with Apple for our use
 544                  */
 545                 vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
 546                 vhdr->modify_date = hfsp_now2mt();
 547                 be32_add_cpu(&vhdr->write_count, 1);
 548                 vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
 549                 vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
 550                 hfsplus_sync_fs(sb, 1);
 551
 552                 if (!sbi->hidden_dir) {
 553                         mutex_lock(&sbi->vh_mutex);
 554                         sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
 555                         if (!sbi->hidden_dir) {
 556                                 mutex_unlock(&sbi->vh_mutex);
 557                                 err = -ENOMEM;
 558                                 goto out_put_root;
 559                         }
 560                         err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
 561                                                  &str, sbi->hidden_dir);
 562                         if (err) {
 563                                 mutex_unlock(&sbi->vh_mutex);
 564                                 goto out_put_hidden_dir;
 565                         }
 566
 567                         err = hfsplus_init_inode_security(sbi->hidden_dir,
 568                                                                 root, &str);
 569                         if (err == -EOPNOTSUPP)
 570                                 err = 0; /* Operation is not supported. */
 571                         else if (err) {
 572                                 /*
 573                                  * Try to delete anyway without
 574                                  * error analysis.
 575                                  */
 576                                 hfsplus_delete_cat(sbi->hidden_dir->i_ino,
 577                                                         root, &str);
 578                                 mutex_unlock(&sbi->vh_mutex);
 579                                 goto out_put_hidden_dir;
 580                         }
 581
 582                         mutex_unlock(&sbi->vh_mutex);
 583                         hfsplus_mark_inode_dirty(sbi->hidden_dir,
 584                                                  HFSPLUS_I_CAT_DIRTY);
 585                 }
 586         }
 587
 588         unload_nls(sbi->nls);
 589         sbi->nls = nls;
 590         return 0;
 591
 592 out_put_hidden_dir:
 593         iput(sbi->hidden_dir);
 594 out_put_root:
 595         dput(sb->s_root);
 596         sb->s_root = NULL;
 597 out_put_alloc_file:
 598         iput(sbi->alloc_file);
 599 out_close_attr_tree:
 600         hfs_btree_close(sbi->attr_tree);
 601 out_close_cat_tree:
 602         hfs_btree_close(sbi->cat_tree);
 603 out_close_ext_tree:
 604         hfs_btree_close(sbi->ext_tree);
 605 out_free_vhdr:
 606         kfree(sbi->s_vhdr_buf);
 607         kfree(sbi->s_backup_vhdr_buf);
 608 out_unload_nls:
 609         unload_nls(sbi->nls);
 610         unload_nls(nls);
 611         kfree(sbi);
 612 out:
 613         return err;
 614 }
 615
 616 MODULE_AUTHOR("Brad Boyer");
 617 MODULE_DESCRIPTION("Extended Macintosh Filesystem");
 618 MODULE_LICENSE("GPL");
 619
 620 static struct kmem_cache *hfsplus_inode_cachep;
 621
 622 static struct inode *hfsplus_alloc_inode(struct super_block *sb)
 623 {
 624         struct hfsplus_inode_info *i;
 625
 626         i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
 627         return i ? &i->vfs_inode : NULL;
 628 }
 629
 630 static void hfsplus_i_callback(struct rcu_head *head)
 631 {
 632         struct inode *inode = container_of(head, struct inode, i_rcu);
 633
 634         kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
 635 }
 636
 637 static void hfsplus_destroy_inode(struct inode *inode)
 638 {
 639         call_rcu(&inode->i_rcu, hfsplus_i_callback);
 640 }
 641
 642 #define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
 643
 644 static struct dentry *hfsplus_mount(struct file_system_type *fs_type,
 645                           int flags, const char *dev_name, void *data)
 646 {
 647         return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
 648 }
 649
 650 static struct file_system_type hfsplus_fs_type = {
 651         .owner          = THIS_MODULE,
 652         .name           = "hfsplus",
 653         .mount          = hfsplus_mount,
 654         .kill_sb        = kill_block_super,
 655         .fs_flags       = FS_REQUIRES_DEV,
 656 };
 657 MODULE_ALIAS_FS("hfsplus");
 658
 659 static void hfsplus_init_once(void *p)
 660 {
 661         struct hfsplus_inode_info *i = p;
 662
 663         inode_init_once(&i->vfs_inode);
 664 }
 665
 666 static int __init init_hfsplus_fs(void)
 667 {
 668         int err;
 669
 670         hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
 671                 HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
 672                 hfsplus_init_once);
 673         if (!hfsplus_inode_cachep)
 674                 return -ENOMEM;
 675         err = hfsplus_create_attr_tree_cache();
 676         if (err)
 677                 goto destroy_inode_cache;
 678         err = register_filesystem(&hfsplus_fs_type);
 679         if (err)
 680                 goto destroy_attr_tree_cache;
 681         return 0;
 682
 683 destroy_attr_tree_cache:
 684         hfsplus_destroy_attr_tree_cache();
 685
 686 destroy_inode_cache:
 687         kmem_cache_destroy(hfsplus_inode_cachep);
 688
 689         return err;
 690 }
 691
 692 static void __exit exit_hfsplus_fs(void)
 693 {
 694         unregister_filesystem(&hfsplus_fs_type);
 695
 696         /*
 697          * Make sure all delayed rcu free inodes are flushed before we
 698          * destroy cache.
 699          */
 700         rcu_barrier();
 701         hfsplus_destroy_attr_tree_cache();
 702         kmem_cache_destroy(hfsplus_inode_cachep);
 703 }
 704
 705 module_init(init_hfsplus_fs)
 706 module_exit(exit_hfsplus_fs)