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