linux/fs/hfsplus/super.c
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   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
  19static struct inode *hfsplus_alloc_inode(struct super_block *sb);
  20static void hfsplus_destroy_inode(struct inode *inode);
  21
  22#include "hfsplus_fs.h"
  23
  24static 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
  55struct 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
  96static 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        default:
 122                return -EIO;
 123        }
 124
 125        if (fork->total_size != cpu_to_be64(inode->i_size)) {
 126                set_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags);
 127                hfsplus_mark_mdb_dirty(inode->i_sb);
 128        }
 129        hfsplus_inode_write_fork(inode, fork);
 130        if (tree)
 131                hfs_btree_write(tree);
 132        return 0;
 133}
 134
 135static int hfsplus_write_inode(struct inode *inode,
 136                struct writeback_control *wbc)
 137{
 138        int err;
 139
 140        dprint(DBG_INODE, "hfsplus_write_inode: %lu\n", inode->i_ino);
 141
 142        err = hfsplus_ext_write_extent(inode);
 143        if (err)
 144                return err;
 145
 146        if (inode->i_ino >= HFSPLUS_FIRSTUSER_CNID ||
 147            inode->i_ino == HFSPLUS_ROOT_CNID)
 148                return hfsplus_cat_write_inode(inode);
 149        else
 150                return hfsplus_system_write_inode(inode);
 151}
 152
 153static void hfsplus_evict_inode(struct inode *inode)
 154{
 155        dprint(DBG_INODE, "hfsplus_evict_inode: %lu\n", inode->i_ino);
 156        truncate_inode_pages(&inode->i_data, 0);
 157        clear_inode(inode);
 158        if (HFSPLUS_IS_RSRC(inode)) {
 159                HFSPLUS_I(HFSPLUS_I(inode)->rsrc_inode)->rsrc_inode = NULL;
 160                iput(HFSPLUS_I(inode)->rsrc_inode);
 161        }
 162}
 163
 164static int hfsplus_sync_fs(struct super_block *sb, int wait)
 165{
 166        struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 167        struct hfsplus_vh *vhdr = sbi->s_vhdr;
 168        int write_backup = 0;
 169        int error, error2;
 170
 171        if (!wait)
 172                return 0;
 173
 174        dprint(DBG_SUPER, "hfsplus_sync_fs\n");
 175
 176        /*
 177         * Explicitly write out the special metadata inodes.
 178         *
 179         * While these special inodes are marked as hashed and written
 180         * out peridocically by the flusher threads we redirty them
 181         * during writeout of normal inodes, and thus the life lock
 182         * prevents us from getting the latest state to disk.
 183         */
 184        error = filemap_write_and_wait(sbi->cat_tree->inode->i_mapping);
 185        error2 = filemap_write_and_wait(sbi->ext_tree->inode->i_mapping);
 186        if (!error)
 187                error = error2;
 188        error2 = filemap_write_and_wait(sbi->alloc_file->i_mapping);
 189        if (!error)
 190                error = error2;
 191
 192        mutex_lock(&sbi->vh_mutex);
 193        mutex_lock(&sbi->alloc_mutex);
 194        vhdr->free_blocks = cpu_to_be32(sbi->free_blocks);
 195        vhdr->next_cnid = cpu_to_be32(sbi->next_cnid);
 196        vhdr->folder_count = cpu_to_be32(sbi->folder_count);
 197        vhdr->file_count = cpu_to_be32(sbi->file_count);
 198
 199        if (test_and_clear_bit(HFSPLUS_SB_WRITEBACKUP, &sbi->flags)) {
 200                memcpy(sbi->s_backup_vhdr, sbi->s_vhdr, sizeof(*sbi->s_vhdr));
 201                write_backup = 1;
 202        }
 203
 204        error2 = hfsplus_submit_bio(sb,
 205                                   sbi->part_start + HFSPLUS_VOLHEAD_SECTOR,
 206                                   sbi->s_vhdr_buf, NULL, WRITE_SYNC);
 207        if (!error)
 208                error = error2;
 209        if (!write_backup)
 210                goto out;
 211
 212        error2 = hfsplus_submit_bio(sb,
 213                                  sbi->part_start + sbi->sect_count - 2,
 214                                  sbi->s_backup_vhdr_buf, NULL, WRITE_SYNC);
 215        if (!error)
 216                error2 = error;
 217out:
 218        mutex_unlock(&sbi->alloc_mutex);
 219        mutex_unlock(&sbi->vh_mutex);
 220
 221        if (!test_bit(HFSPLUS_SB_NOBARRIER, &sbi->flags))
 222                blkdev_issue_flush(sb->s_bdev, GFP_KERNEL, NULL);
 223
 224        return error;
 225}
 226
 227static void delayed_sync_fs(struct work_struct *work)
 228{
 229        struct hfsplus_sb_info *sbi;
 230
 231        sbi = container_of(work, struct hfsplus_sb_info, sync_work.work);
 232
 233        spin_lock(&sbi->work_lock);
 234        sbi->work_queued = 0;
 235        spin_unlock(&sbi->work_lock);
 236
 237        hfsplus_sync_fs(sbi->alloc_file->i_sb, 1);
 238}
 239
 240void hfsplus_mark_mdb_dirty(struct super_block *sb)
 241{
 242        struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 243        unsigned long delay;
 244
 245        if (sb->s_flags & MS_RDONLY)
 246                return;
 247
 248        spin_lock(&sbi->work_lock);
 249        if (!sbi->work_queued) {
 250                delay = msecs_to_jiffies(dirty_writeback_interval * 10);
 251                queue_delayed_work(system_long_wq, &sbi->sync_work, delay);
 252                sbi->work_queued = 1;
 253        }
 254        spin_unlock(&sbi->work_lock);
 255}
 256
 257static void hfsplus_put_super(struct super_block *sb)
 258{
 259        struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 260
 261        dprint(DBG_SUPER, "hfsplus_put_super\n");
 262
 263        cancel_delayed_work_sync(&sbi->sync_work);
 264
 265        if (!(sb->s_flags & MS_RDONLY) && sbi->s_vhdr) {
 266                struct hfsplus_vh *vhdr = sbi->s_vhdr;
 267
 268                vhdr->modify_date = hfsp_now2mt();
 269                vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_UNMNT);
 270                vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_INCNSTNT);
 271
 272                hfsplus_sync_fs(sb, 1);
 273        }
 274
 275        hfs_btree_close(sbi->cat_tree);
 276        hfs_btree_close(sbi->ext_tree);
 277        iput(sbi->alloc_file);
 278        iput(sbi->hidden_dir);
 279        kfree(sbi->s_vhdr_buf);
 280        kfree(sbi->s_backup_vhdr_buf);
 281        unload_nls(sbi->nls);
 282        kfree(sb->s_fs_info);
 283        sb->s_fs_info = NULL;
 284}
 285
 286static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf)
 287{
 288        struct super_block *sb = dentry->d_sb;
 289        struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
 290        u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 291
 292        buf->f_type = HFSPLUS_SUPER_MAGIC;
 293        buf->f_bsize = sb->s_blocksize;
 294        buf->f_blocks = sbi->total_blocks << sbi->fs_shift;
 295        buf->f_bfree = sbi->free_blocks << sbi->fs_shift;
 296        buf->f_bavail = buf->f_bfree;
 297        buf->f_files = 0xFFFFFFFF;
 298        buf->f_ffree = 0xFFFFFFFF - sbi->next_cnid;
 299        buf->f_fsid.val[0] = (u32)id;
 300        buf->f_fsid.val[1] = (u32)(id >> 32);
 301        buf->f_namelen = HFSPLUS_MAX_STRLEN;
 302
 303        return 0;
 304}
 305
 306static int hfsplus_remount(struct super_block *sb, int *flags, char *data)
 307{
 308        if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
 309                return 0;
 310        if (!(*flags & MS_RDONLY)) {
 311                struct hfsplus_vh *vhdr = HFSPLUS_SB(sb)->s_vhdr;
 312                int force = 0;
 313
 314                if (!hfsplus_parse_options_remount(data, &force))
 315                        return -EINVAL;
 316
 317                if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 318                        printk(KERN_WARNING "hfs: filesystem was "
 319                                        "not cleanly unmounted, "
 320                                        "running fsck.hfsplus is recommended.  "
 321                                        "leaving read-only.\n");
 322                        sb->s_flags |= MS_RDONLY;
 323                        *flags |= MS_RDONLY;
 324                } else if (force) {
 325                        /* nothing */
 326                } else if (vhdr->attributes &
 327                                cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 328                        printk(KERN_WARNING "hfs: filesystem is marked locked, "
 329                                        "leaving read-only.\n");
 330                        sb->s_flags |= MS_RDONLY;
 331                        *flags |= MS_RDONLY;
 332                } else if (vhdr->attributes &
 333                                cpu_to_be32(HFSPLUS_VOL_JOURNALED)) {
 334                        printk(KERN_WARNING "hfs: filesystem is "
 335                                        "marked journaled, "
 336                                        "leaving read-only.\n");
 337                        sb->s_flags |= MS_RDONLY;
 338                        *flags |= MS_RDONLY;
 339                }
 340        }
 341        return 0;
 342}
 343
 344static const struct super_operations hfsplus_sops = {
 345        .alloc_inode    = hfsplus_alloc_inode,
 346        .destroy_inode  = hfsplus_destroy_inode,
 347        .write_inode    = hfsplus_write_inode,
 348        .evict_inode    = hfsplus_evict_inode,
 349        .put_super      = hfsplus_put_super,
 350        .sync_fs        = hfsplus_sync_fs,
 351        .statfs         = hfsplus_statfs,
 352        .remount_fs     = hfsplus_remount,
 353        .show_options   = hfsplus_show_options,
 354};
 355
 356static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
 357{
 358        struct hfsplus_vh *vhdr;
 359        struct hfsplus_sb_info *sbi;
 360        hfsplus_cat_entry entry;
 361        struct hfs_find_data fd;
 362        struct inode *root, *inode;
 363        struct qstr str;
 364        struct nls_table *nls = NULL;
 365        u64 last_fs_block, last_fs_page;
 366        int err;
 367
 368        err = -ENOMEM;
 369        sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
 370        if (!sbi)
 371                goto out;
 372
 373        sb->s_fs_info = sbi;
 374        mutex_init(&sbi->alloc_mutex);
 375        mutex_init(&sbi->vh_mutex);
 376        spin_lock_init(&sbi->work_lock);
 377        INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
 378        hfsplus_fill_defaults(sbi);
 379
 380        err = -EINVAL;
 381        if (!hfsplus_parse_options(data, sbi)) {
 382                printk(KERN_ERR "hfs: unable to parse mount options\n");
 383                goto out_unload_nls;
 384        }
 385
 386        /* temporarily use utf8 to correctly find the hidden dir below */
 387        nls = sbi->nls;
 388        sbi->nls = load_nls("utf8");
 389        if (!sbi->nls) {
 390                printk(KERN_ERR "hfs: unable to load nls for utf8\n");
 391                goto out_unload_nls;
 392        }
 393
 394        /* Grab the volume header */
 395        if (hfsplus_read_wrapper(sb)) {
 396                if (!silent)
 397                        printk(KERN_WARNING "hfs: unable to find HFS+ superblock\n");
 398                goto out_unload_nls;
 399        }
 400        vhdr = sbi->s_vhdr;
 401
 402        /* Copy parts of the volume header into the superblock */
 403        sb->s_magic = HFSPLUS_VOLHEAD_SIG;
 404        if (be16_to_cpu(vhdr->version) < HFSPLUS_MIN_VERSION ||
 405            be16_to_cpu(vhdr->version) > HFSPLUS_CURRENT_VERSION) {
 406                printk(KERN_ERR "hfs: wrong filesystem version\n");
 407                goto out_free_vhdr;
 408        }
 409        sbi->total_blocks = be32_to_cpu(vhdr->total_blocks);
 410        sbi->free_blocks = be32_to_cpu(vhdr->free_blocks);
 411        sbi->next_cnid = be32_to_cpu(vhdr->next_cnid);
 412        sbi->file_count = be32_to_cpu(vhdr->file_count);
 413        sbi->folder_count = be32_to_cpu(vhdr->folder_count);
 414        sbi->data_clump_blocks =
 415                be32_to_cpu(vhdr->data_clump_sz) >> sbi->alloc_blksz_shift;
 416        if (!sbi->data_clump_blocks)
 417                sbi->data_clump_blocks = 1;
 418        sbi->rsrc_clump_blocks =
 419                be32_to_cpu(vhdr->rsrc_clump_sz) >> sbi->alloc_blksz_shift;
 420        if (!sbi->rsrc_clump_blocks)
 421                sbi->rsrc_clump_blocks = 1;
 422
 423        err = -EFBIG;
 424        last_fs_block = sbi->total_blocks - 1;
 425        last_fs_page = (last_fs_block << sbi->alloc_blksz_shift) >>
 426                        PAGE_CACHE_SHIFT;
 427
 428        if ((last_fs_block > (sector_t)(~0ULL) >> (sbi->alloc_blksz_shift - 9)) ||
 429            (last_fs_page > (pgoff_t)(~0ULL))) {
 430                printk(KERN_ERR "hfs: filesystem size too large.\n");
 431                goto out_free_vhdr;
 432        }
 433
 434        /* Set up operations so we can load metadata */
 435        sb->s_op = &hfsplus_sops;
 436        sb->s_maxbytes = MAX_LFS_FILESIZE;
 437
 438        if (!(vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_UNMNT))) {
 439                printk(KERN_WARNING "hfs: Filesystem was "
 440                                "not cleanly unmounted, "
 441                                "running fsck.hfsplus is recommended.  "
 442                                "mounting read-only.\n");
 443                sb->s_flags |= MS_RDONLY;
 444        } else if (test_and_clear_bit(HFSPLUS_SB_FORCE, &sbi->flags)) {
 445                /* nothing */
 446        } else if (vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_SOFTLOCK)) {
 447                printk(KERN_WARNING "hfs: Filesystem is marked locked, mounting read-only.\n");
 448                sb->s_flags |= MS_RDONLY;
 449        } else if ((vhdr->attributes & cpu_to_be32(HFSPLUS_VOL_JOURNALED)) &&
 450                        !(sb->s_flags & MS_RDONLY)) {
 451                printk(KERN_WARNING "hfs: write access to "
 452                                "a journaled filesystem is not supported, "
 453                                "use the force option at your own risk, "
 454                                "mounting read-only.\n");
 455                sb->s_flags |= MS_RDONLY;
 456        }
 457
 458        err = -EINVAL;
 459
 460        /* Load metadata objects (B*Trees) */
 461        sbi->ext_tree = hfs_btree_open(sb, HFSPLUS_EXT_CNID);
 462        if (!sbi->ext_tree) {
 463                printk(KERN_ERR "hfs: failed to load extents file\n");
 464                goto out_free_vhdr;
 465        }
 466        sbi->cat_tree = hfs_btree_open(sb, HFSPLUS_CAT_CNID);
 467        if (!sbi->cat_tree) {
 468                printk(KERN_ERR "hfs: failed to load catalog file\n");
 469                goto out_close_ext_tree;
 470        }
 471
 472        inode = hfsplus_iget(sb, HFSPLUS_ALLOC_CNID);
 473        if (IS_ERR(inode)) {
 474                printk(KERN_ERR "hfs: failed to load allocation file\n");
 475                err = PTR_ERR(inode);
 476                goto out_close_cat_tree;
 477        }
 478        sbi->alloc_file = inode;
 479
 480        /* Load the root directory */
 481        root = hfsplus_iget(sb, HFSPLUS_ROOT_CNID);
 482        if (IS_ERR(root)) {
 483                printk(KERN_ERR "hfs: failed to load root directory\n");
 484                err = PTR_ERR(root);
 485                goto out_put_alloc_file;
 486        }
 487
 488        sb->s_d_op = &hfsplus_dentry_operations;
 489        sb->s_root = d_make_root(root);
 490        if (!sb->s_root) {
 491                err = -ENOMEM;
 492                goto out_put_alloc_file;
 493        }
 494
 495        str.len = sizeof(HFSP_HIDDENDIR_NAME) - 1;
 496        str.name = HFSP_HIDDENDIR_NAME;
 497        err = hfs_find_init(sbi->cat_tree, &fd);
 498        if (err)
 499                goto out_put_root;
 500        hfsplus_cat_build_key(sb, fd.search_key, HFSPLUS_ROOT_CNID, &str);
 501        if (!hfs_brec_read(&fd, &entry, sizeof(entry))) {
 502                hfs_find_exit(&fd);
 503                if (entry.type != cpu_to_be16(HFSPLUS_FOLDER))
 504                        goto out_put_root;
 505                inode = hfsplus_iget(sb, be32_to_cpu(entry.folder.id));
 506                if (IS_ERR(inode)) {
 507                        err = PTR_ERR(inode);
 508                        goto out_put_root;
 509                }
 510                sbi->hidden_dir = inode;
 511        } else
 512                hfs_find_exit(&fd);
 513
 514        if (!(sb->s_flags & MS_RDONLY)) {
 515                /*
 516                 * H+LX == hfsplusutils, H+Lx == this driver, H+lx is unused
 517                 * all three are registered with Apple for our use
 518                 */
 519                vhdr->last_mount_vers = cpu_to_be32(HFSP_MOUNT_VERSION);
 520                vhdr->modify_date = hfsp_now2mt();
 521                be32_add_cpu(&vhdr->write_count, 1);
 522                vhdr->attributes &= cpu_to_be32(~HFSPLUS_VOL_UNMNT);
 523                vhdr->attributes |= cpu_to_be32(HFSPLUS_VOL_INCNSTNT);
 524                hfsplus_sync_fs(sb, 1);
 525
 526                if (!sbi->hidden_dir) {
 527                        mutex_lock(&sbi->vh_mutex);
 528                        sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
 529                        if (!sbi->hidden_dir) {
 530                                mutex_unlock(&sbi->vh_mutex);
 531                                err = -ENOMEM;
 532                                goto out_put_root;
 533                        }
 534                        err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
 535                                                 &str, sbi->hidden_dir);
 536                        mutex_unlock(&sbi->vh_mutex);
 537                        if (err)
 538                                goto out_put_hidden_dir;
 539
 540                        hfsplus_mark_inode_dirty(sbi->hidden_dir,
 541                                                 HFSPLUS_I_CAT_DIRTY);
 542                }
 543        }
 544
 545        unload_nls(sbi->nls);
 546        sbi->nls = nls;
 547        return 0;
 548
 549out_put_hidden_dir:
 550        iput(sbi->hidden_dir);
 551out_put_root:
 552        dput(sb->s_root);
 553        sb->s_root = NULL;
 554out_put_alloc_file:
 555        iput(sbi->alloc_file);
 556out_close_cat_tree:
 557        hfs_btree_close(sbi->cat_tree);
 558out_close_ext_tree:
 559        hfs_btree_close(sbi->ext_tree);
 560out_free_vhdr:
 561        kfree(sbi->s_vhdr_buf);
 562        kfree(sbi->s_backup_vhdr_buf);
 563out_unload_nls:
 564        unload_nls(sbi->nls);
 565        unload_nls(nls);
 566        kfree(sbi);
 567out:
 568        return err;
 569}
 570
 571MODULE_AUTHOR("Brad Boyer");
 572MODULE_DESCRIPTION("Extended Macintosh Filesystem");
 573MODULE_LICENSE("GPL");
 574
 575static struct kmem_cache *hfsplus_inode_cachep;
 576
 577static struct inode *hfsplus_alloc_inode(struct super_block *sb)
 578{
 579        struct hfsplus_inode_info *i;
 580
 581        i = kmem_cache_alloc(hfsplus_inode_cachep, GFP_KERNEL);
 582        return i ? &i->vfs_inode : NULL;
 583}
 584
 585static void hfsplus_i_callback(struct rcu_head *head)
 586{
 587        struct inode *inode = container_of(head, struct inode, i_rcu);
 588
 589        kmem_cache_free(hfsplus_inode_cachep, HFSPLUS_I(inode));
 590}
 591
 592static void hfsplus_destroy_inode(struct inode *inode)
 593{
 594        call_rcu(&inode->i_rcu, hfsplus_i_callback);
 595}
 596
 597#define HFSPLUS_INODE_SIZE      sizeof(struct hfsplus_inode_info)
 598
 599static struct dentry *hfsplus_mount(struct file_system_type *fs_type,
 600                          int flags, const char *dev_name, void *data)
 601{
 602        return mount_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
 603}
 604
 605static struct file_system_type hfsplus_fs_type = {
 606        .owner          = THIS_MODULE,
 607        .name           = "hfsplus",
 608        .mount          = hfsplus_mount,
 609        .kill_sb        = kill_block_super,
 610        .fs_flags       = FS_REQUIRES_DEV,
 611};
 612
 613static void hfsplus_init_once(void *p)
 614{
 615        struct hfsplus_inode_info *i = p;
 616
 617        inode_init_once(&i->vfs_inode);
 618}
 619
 620static int __init init_hfsplus_fs(void)
 621{
 622        int err;
 623
 624        hfsplus_inode_cachep = kmem_cache_create("hfsplus_icache",
 625                HFSPLUS_INODE_SIZE, 0, SLAB_HWCACHE_ALIGN,
 626                hfsplus_init_once);
 627        if (!hfsplus_inode_cachep)
 628                return -ENOMEM;
 629        err = register_filesystem(&hfsplus_fs_type);
 630        if (err)
 631                kmem_cache_destroy(hfsplus_inode_cachep);
 632        return err;
 633}
 634
 635static void __exit exit_hfsplus_fs(void)
 636{
 637        unregister_filesystem(&hfsplus_fs_type);
 638
 639        /*
 640         * Make sure all delayed rcu free inodes are flushed before we
 641         * destroy cache.
 642         */
 643        rcu_barrier();
 644        kmem_cache_destroy(hfsplus_inode_cachep);
 645}
 646
 647module_init(init_hfsplus_fs)
 648module_exit(exit_hfsplus_fs)
 649
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