linux/fs/affs/super.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  linux/fs/affs/inode.c
   4 *
   5 *  (c) 1996  Hans-Joachim Widmaier - Rewritten
   6 *
   7 *  (C) 1993  Ray Burr - Modified for Amiga FFS filesystem.
   8 *
   9 *  (C) 1992  Eric Youngdale Modified for ISO 9660 filesystem.
  10 *
  11 *  (C) 1991  Linus Torvalds - minix filesystem
  12 */
  13
  14#include <linux/module.h>
  15#include <linux/init.h>
  16#include <linux/statfs.h>
  17#include <linux/parser.h>
  18#include <linux/magic.h>
  19#include <linux/sched.h>
  20#include <linux/cred.h>
  21#include <linux/slab.h>
  22#include <linux/writeback.h>
  23#include <linux/blkdev.h>
  24#include <linux/seq_file.h>
  25#include <linux/iversion.h>
  26#include "affs.h"
  27
  28static int affs_statfs(struct dentry *dentry, struct kstatfs *buf);
  29static int affs_show_options(struct seq_file *m, struct dentry *root);
  30static int affs_remount (struct super_block *sb, int *flags, char *data);
  31
  32static void
  33affs_commit_super(struct super_block *sb, int wait)
  34{
  35        struct affs_sb_info *sbi = AFFS_SB(sb);
  36        struct buffer_head *bh = sbi->s_root_bh;
  37        struct affs_root_tail *tail = AFFS_ROOT_TAIL(sb, bh);
  38
  39        lock_buffer(bh);
  40        affs_secs_to_datestamp(ktime_get_real_seconds(), &tail->disk_change);
  41        affs_fix_checksum(sb, bh);
  42        unlock_buffer(bh);
  43
  44        mark_buffer_dirty(bh);
  45        if (wait)
  46                sync_dirty_buffer(bh);
  47}
  48
  49static void
  50affs_put_super(struct super_block *sb)
  51{
  52        struct affs_sb_info *sbi = AFFS_SB(sb);
  53        pr_debug("%s()\n", __func__);
  54
  55        cancel_delayed_work_sync(&sbi->sb_work);
  56}
  57
  58static int
  59affs_sync_fs(struct super_block *sb, int wait)
  60{
  61        affs_commit_super(sb, wait);
  62        return 0;
  63}
  64
  65static void flush_superblock(struct work_struct *work)
  66{
  67        struct affs_sb_info *sbi;
  68        struct super_block *sb;
  69
  70        sbi = container_of(work, struct affs_sb_info, sb_work.work);
  71        sb = sbi->sb;
  72
  73        spin_lock(&sbi->work_lock);
  74        sbi->work_queued = 0;
  75        spin_unlock(&sbi->work_lock);
  76
  77        affs_commit_super(sb, 1);
  78}
  79
  80void affs_mark_sb_dirty(struct super_block *sb)
  81{
  82        struct affs_sb_info *sbi = AFFS_SB(sb);
  83        unsigned long delay;
  84
  85        if (sb_rdonly(sb))
  86               return;
  87
  88        spin_lock(&sbi->work_lock);
  89        if (!sbi->work_queued) {
  90               delay = msecs_to_jiffies(dirty_writeback_interval * 10);
  91               queue_delayed_work(system_long_wq, &sbi->sb_work, delay);
  92               sbi->work_queued = 1;
  93        }
  94        spin_unlock(&sbi->work_lock);
  95}
  96
  97static struct kmem_cache * affs_inode_cachep;
  98
  99static struct inode *affs_alloc_inode(struct super_block *sb)
 100{
 101        struct affs_inode_info *i;
 102
 103        i = alloc_inode_sb(sb, affs_inode_cachep, GFP_KERNEL);
 104        if (!i)
 105                return NULL;
 106
 107        inode_set_iversion(&i->vfs_inode, 1);
 108        i->i_lc = NULL;
 109        i->i_ext_bh = NULL;
 110        i->i_pa_cnt = 0;
 111
 112        return &i->vfs_inode;
 113}
 114
 115static void affs_free_inode(struct inode *inode)
 116{
 117        kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
 118}
 119
 120static void init_once(void *foo)
 121{
 122        struct affs_inode_info *ei = (struct affs_inode_info *) foo;
 123
 124        mutex_init(&ei->i_link_lock);
 125        mutex_init(&ei->i_ext_lock);
 126        inode_init_once(&ei->vfs_inode);
 127}
 128
 129static int __init init_inodecache(void)
 130{
 131        affs_inode_cachep = kmem_cache_create("affs_inode_cache",
 132                                             sizeof(struct affs_inode_info),
 133                                             0, (SLAB_RECLAIM_ACCOUNT|
 134                                                SLAB_MEM_SPREAD|SLAB_ACCOUNT),
 135                                             init_once);
 136        if (affs_inode_cachep == NULL)
 137                return -ENOMEM;
 138        return 0;
 139}
 140
 141static void destroy_inodecache(void)
 142{
 143        /*
 144         * Make sure all delayed rcu free inodes are flushed before we
 145         * destroy cache.
 146         */
 147        rcu_barrier();
 148        kmem_cache_destroy(affs_inode_cachep);
 149}
 150
 151static const struct super_operations affs_sops = {
 152        .alloc_inode    = affs_alloc_inode,
 153        .free_inode     = affs_free_inode,
 154        .write_inode    = affs_write_inode,
 155        .evict_inode    = affs_evict_inode,
 156        .put_super      = affs_put_super,
 157        .sync_fs        = affs_sync_fs,
 158        .statfs         = affs_statfs,
 159        .remount_fs     = affs_remount,
 160        .show_options   = affs_show_options,
 161};
 162
 163enum {
 164        Opt_bs, Opt_mode, Opt_mufs, Opt_notruncate, Opt_prefix, Opt_protect,
 165        Opt_reserved, Opt_root, Opt_setgid, Opt_setuid,
 166        Opt_verbose, Opt_volume, Opt_ignore, Opt_err,
 167};
 168
 169static const match_table_t tokens = {
 170        {Opt_bs, "bs=%u"},
 171        {Opt_mode, "mode=%o"},
 172        {Opt_mufs, "mufs"},
 173        {Opt_notruncate, "nofilenametruncate"},
 174        {Opt_prefix, "prefix=%s"},
 175        {Opt_protect, "protect"},
 176        {Opt_reserved, "reserved=%u"},
 177        {Opt_root, "root=%u"},
 178        {Opt_setgid, "setgid=%u"},
 179        {Opt_setuid, "setuid=%u"},
 180        {Opt_verbose, "verbose"},
 181        {Opt_volume, "volume=%s"},
 182        {Opt_ignore, "grpquota"},
 183        {Opt_ignore, "noquota"},
 184        {Opt_ignore, "quota"},
 185        {Opt_ignore, "usrquota"},
 186        {Opt_err, NULL},
 187};
 188
 189static int
 190parse_options(char *options, kuid_t *uid, kgid_t *gid, int *mode, int *reserved, s32 *root,
 191                int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
 192{
 193        char *p;
 194        substring_t args[MAX_OPT_ARGS];
 195
 196        /* Fill in defaults */
 197
 198        *uid        = current_uid();
 199        *gid        = current_gid();
 200        *reserved   = 2;
 201        *root       = -1;
 202        *blocksize  = -1;
 203        volume[0]   = ':';
 204        volume[1]   = 0;
 205        *mount_opts = 0;
 206        if (!options)
 207                return 1;
 208
 209        while ((p = strsep(&options, ",")) != NULL) {
 210                int token, n, option;
 211                if (!*p)
 212                        continue;
 213
 214                token = match_token(p, tokens, args);
 215                switch (token) {
 216                case Opt_bs:
 217                        if (match_int(&args[0], &n))
 218                                return 0;
 219                        if (n != 512 && n != 1024 && n != 2048
 220                            && n != 4096) {
 221                                pr_warn("Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
 222                                return 0;
 223                        }
 224                        *blocksize = n;
 225                        break;
 226                case Opt_mode:
 227                        if (match_octal(&args[0], &option))
 228                                return 0;
 229                        *mode = option & 0777;
 230                        affs_set_opt(*mount_opts, SF_SETMODE);
 231                        break;
 232                case Opt_mufs:
 233                        affs_set_opt(*mount_opts, SF_MUFS);
 234                        break;
 235                case Opt_notruncate:
 236                        affs_set_opt(*mount_opts, SF_NO_TRUNCATE);
 237                        break;
 238                case Opt_prefix:
 239                        kfree(*prefix);
 240                        *prefix = match_strdup(&args[0]);
 241                        if (!*prefix)
 242                                return 0;
 243                        affs_set_opt(*mount_opts, SF_PREFIX);
 244                        break;
 245                case Opt_protect:
 246                        affs_set_opt(*mount_opts, SF_IMMUTABLE);
 247                        break;
 248                case Opt_reserved:
 249                        if (match_int(&args[0], reserved))
 250                                return 0;
 251                        break;
 252                case Opt_root:
 253                        if (match_int(&args[0], root))
 254                                return 0;
 255                        break;
 256                case Opt_setgid:
 257                        if (match_int(&args[0], &option))
 258                                return 0;
 259                        *gid = make_kgid(current_user_ns(), option);
 260                        if (!gid_valid(*gid))
 261                                return 0;
 262                        affs_set_opt(*mount_opts, SF_SETGID);
 263                        break;
 264                case Opt_setuid:
 265                        if (match_int(&args[0], &option))
 266                                return 0;
 267                        *uid = make_kuid(current_user_ns(), option);
 268                        if (!uid_valid(*uid))
 269                                return 0;
 270                        affs_set_opt(*mount_opts, SF_SETUID);
 271                        break;
 272                case Opt_verbose:
 273                        affs_set_opt(*mount_opts, SF_VERBOSE);
 274                        break;
 275                case Opt_volume: {
 276                        char *vol = match_strdup(&args[0]);
 277                        if (!vol)
 278                                return 0;
 279                        strlcpy(volume, vol, 32);
 280                        kfree(vol);
 281                        break;
 282                }
 283                case Opt_ignore:
 284                        /* Silently ignore the quota options */
 285                        break;
 286                default:
 287                        pr_warn("Unrecognized mount option \"%s\" or missing value\n",
 288                                p);
 289                        return 0;
 290                }
 291        }
 292        return 1;
 293}
 294
 295static int affs_show_options(struct seq_file *m, struct dentry *root)
 296{
 297        struct super_block *sb = root->d_sb;
 298        struct affs_sb_info *sbi = AFFS_SB(sb);
 299
 300        if (sb->s_blocksize)
 301                seq_printf(m, ",bs=%lu", sb->s_blocksize);
 302        if (affs_test_opt(sbi->s_flags, SF_SETMODE))
 303                seq_printf(m, ",mode=%o", sbi->s_mode);
 304        if (affs_test_opt(sbi->s_flags, SF_MUFS))
 305                seq_puts(m, ",mufs");
 306        if (affs_test_opt(sbi->s_flags, SF_NO_TRUNCATE))
 307                seq_puts(m, ",nofilenametruncate");
 308        if (affs_test_opt(sbi->s_flags, SF_PREFIX))
 309                seq_printf(m, ",prefix=%s", sbi->s_prefix);
 310        if (affs_test_opt(sbi->s_flags, SF_IMMUTABLE))
 311                seq_puts(m, ",protect");
 312        if (sbi->s_reserved != 2)
 313                seq_printf(m, ",reserved=%u", sbi->s_reserved);
 314        if (sbi->s_root_block != (sbi->s_reserved + sbi->s_partition_size - 1) / 2)
 315                seq_printf(m, ",root=%u", sbi->s_root_block);
 316        if (affs_test_opt(sbi->s_flags, SF_SETGID))
 317                seq_printf(m, ",setgid=%u",
 318                           from_kgid_munged(&init_user_ns, sbi->s_gid));
 319        if (affs_test_opt(sbi->s_flags, SF_SETUID))
 320                seq_printf(m, ",setuid=%u",
 321                           from_kuid_munged(&init_user_ns, sbi->s_uid));
 322        if (affs_test_opt(sbi->s_flags, SF_VERBOSE))
 323                seq_puts(m, ",verbose");
 324        if (sbi->s_volume[0])
 325                seq_printf(m, ",volume=%s", sbi->s_volume);
 326        return 0;
 327}
 328
 329/* This function definitely needs to be split up. Some fine day I'll
 330 * hopefully have the guts to do so. Until then: sorry for the mess.
 331 */
 332
 333static int affs_fill_super(struct super_block *sb, void *data, int silent)
 334{
 335        struct affs_sb_info     *sbi;
 336        struct buffer_head      *root_bh = NULL;
 337        struct buffer_head      *boot_bh;
 338        struct inode            *root_inode = NULL;
 339        s32                      root_block;
 340        int                      size, blocksize;
 341        u32                      chksum;
 342        int                      num_bm;
 343        int                      i, j;
 344        kuid_t                   uid;
 345        kgid_t                   gid;
 346        int                      reserved;
 347        unsigned long            mount_flags;
 348        int                      tmp_flags;     /* fix remount prototype... */
 349        u8                       sig[4];
 350        int                      ret;
 351
 352        pr_debug("read_super(%s)\n", data ? (const char *)data : "no options");
 353
 354        sb->s_magic             = AFFS_SUPER_MAGIC;
 355        sb->s_op                = &affs_sops;
 356        sb->s_flags |= SB_NODIRATIME;
 357
 358        sb->s_time_gran = NSEC_PER_SEC;
 359        sb->s_time_min = sys_tz.tz_minuteswest * 60 + AFFS_EPOCH_DELTA;
 360        sb->s_time_max = 86400LL * U32_MAX + 86400 + sb->s_time_min;
 361
 362        sbi = kzalloc(sizeof(struct affs_sb_info), GFP_KERNEL);
 363        if (!sbi)
 364                return -ENOMEM;
 365
 366        sb->s_fs_info = sbi;
 367        sbi->sb = sb;
 368        mutex_init(&sbi->s_bmlock);
 369        spin_lock_init(&sbi->symlink_lock);
 370        spin_lock_init(&sbi->work_lock);
 371        INIT_DELAYED_WORK(&sbi->sb_work, flush_superblock);
 372
 373        if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
 374                                &blocksize,&sbi->s_prefix,
 375                                sbi->s_volume, &mount_flags)) {
 376                pr_err("Error parsing options\n");
 377                return -EINVAL;
 378        }
 379        /* N.B. after this point s_prefix must be released */
 380
 381        sbi->s_flags   = mount_flags;
 382        sbi->s_mode    = i;
 383        sbi->s_uid     = uid;
 384        sbi->s_gid     = gid;
 385        sbi->s_reserved= reserved;
 386
 387        /* Get the size of the device in 512-byte blocks.
 388         * If we later see that the partition uses bigger
 389         * blocks, we will have to change it.
 390         */
 391
 392        size = bdev_nr_sectors(sb->s_bdev);
 393        pr_debug("initial blocksize=%d, #blocks=%d\n", 512, size);
 394
 395        affs_set_blocksize(sb, PAGE_SIZE);
 396        /* Try to find root block. Its location depends on the block size. */
 397
 398        i = bdev_logical_block_size(sb->s_bdev);
 399        j = PAGE_SIZE;
 400        if (blocksize > 0) {
 401                i = j = blocksize;
 402                size = size / (blocksize / 512);
 403        }
 404
 405        for (blocksize = i; blocksize <= j; blocksize <<= 1, size >>= 1) {
 406                sbi->s_root_block = root_block;
 407                if (root_block < 0)
 408                        sbi->s_root_block = (reserved + size - 1) / 2;
 409                pr_debug("setting blocksize to %d\n", blocksize);
 410                affs_set_blocksize(sb, blocksize);
 411                sbi->s_partition_size = size;
 412
 413                /* The root block location that was calculated above is not
 414                 * correct if the partition size is an odd number of 512-
 415                 * byte blocks, which will be rounded down to a number of
 416                 * 1024-byte blocks, and if there were an even number of
 417                 * reserved blocks. Ideally, all partition checkers should
 418                 * report the real number of blocks of the real blocksize,
 419                 * but since this just cannot be done, we have to try to
 420                 * find the root block anyways. In the above case, it is one
 421                 * block behind the calculated one. So we check this one, too.
 422                 */
 423                for (num_bm = 0; num_bm < 2; num_bm++) {
 424                        pr_debug("Dev %s, trying root=%u, bs=%d, "
 425                                "size=%d, reserved=%d\n",
 426                                sb->s_id,
 427                                sbi->s_root_block + num_bm,
 428                                blocksize, size, reserved);
 429                        root_bh = affs_bread(sb, sbi->s_root_block + num_bm);
 430                        if (!root_bh)
 431                                continue;
 432                        if (!affs_checksum_block(sb, root_bh) &&
 433                            be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
 434                            be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
 435                                sbi->s_hashsize    = blocksize / 4 - 56;
 436                                sbi->s_root_block += num_bm;
 437                                goto got_root;
 438                        }
 439                        affs_brelse(root_bh);
 440                        root_bh = NULL;
 441                }
 442        }
 443        if (!silent)
 444                pr_err("No valid root block on device %s\n", sb->s_id);
 445        return -EINVAL;
 446
 447        /* N.B. after this point bh must be released */
 448got_root:
 449        /* Keep super block in cache */
 450        sbi->s_root_bh = root_bh;
 451        root_block = sbi->s_root_block;
 452
 453        /* Find out which kind of FS we have */
 454        boot_bh = sb_bread(sb, 0);
 455        if (!boot_bh) {
 456                pr_err("Cannot read boot block\n");
 457                return -EINVAL;
 458        }
 459        memcpy(sig, boot_bh->b_data, 4);
 460        brelse(boot_bh);
 461        chksum = be32_to_cpu(*(__be32 *)sig);
 462
 463        /* Dircache filesystems are compatible with non-dircache ones
 464         * when reading. As long as they aren't supported, writing is
 465         * not recommended.
 466         */
 467        if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
 468             || chksum == MUFS_DCOFS) && !sb_rdonly(sb)) {
 469                pr_notice("Dircache FS - mounting %s read only\n", sb->s_id);
 470                sb->s_flags |= SB_RDONLY;
 471        }
 472        switch (chksum) {
 473        case MUFS_FS:
 474        case MUFS_INTLFFS:
 475        case MUFS_DCFFS:
 476                affs_set_opt(sbi->s_flags, SF_MUFS);
 477                fallthrough;
 478        case FS_INTLFFS:
 479        case FS_DCFFS:
 480                affs_set_opt(sbi->s_flags, SF_INTL);
 481                break;
 482        case MUFS_FFS:
 483                affs_set_opt(sbi->s_flags, SF_MUFS);
 484                break;
 485        case FS_FFS:
 486                break;
 487        case MUFS_OFS:
 488                affs_set_opt(sbi->s_flags, SF_MUFS);
 489                fallthrough;
 490        case FS_OFS:
 491                affs_set_opt(sbi->s_flags, SF_OFS);
 492                sb->s_flags |= SB_NOEXEC;
 493                break;
 494        case MUFS_DCOFS:
 495        case MUFS_INTLOFS:
 496                affs_set_opt(sbi->s_flags, SF_MUFS);
 497                fallthrough;
 498        case FS_DCOFS:
 499        case FS_INTLOFS:
 500                affs_set_opt(sbi->s_flags, SF_INTL);
 501                affs_set_opt(sbi->s_flags, SF_OFS);
 502                sb->s_flags |= SB_NOEXEC;
 503                break;
 504        default:
 505                pr_err("Unknown filesystem on device %s: %08X\n",
 506                       sb->s_id, chksum);
 507                return -EINVAL;
 508        }
 509
 510        if (affs_test_opt(mount_flags, SF_VERBOSE)) {
 511                u8 len = AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0];
 512                pr_notice("Mounting volume \"%.*s\": Type=%.3s\\%c, Blocksize=%d\n",
 513                        len > 31 ? 31 : len,
 514                        AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
 515                        sig, sig[3] + '0', blocksize);
 516        }
 517
 518        sb->s_flags |= SB_NODEV | SB_NOSUID;
 519
 520        sbi->s_data_blksize = sb->s_blocksize;
 521        if (affs_test_opt(sbi->s_flags, SF_OFS))
 522                sbi->s_data_blksize -= 24;
 523
 524        tmp_flags = sb->s_flags;
 525        ret = affs_init_bitmap(sb, &tmp_flags);
 526        if (ret)
 527                return ret;
 528        sb->s_flags = tmp_flags;
 529
 530        /* set up enough so that it can read an inode */
 531
 532        root_inode = affs_iget(sb, root_block);
 533        if (IS_ERR(root_inode))
 534                return PTR_ERR(root_inode);
 535
 536        if (affs_test_opt(AFFS_SB(sb)->s_flags, SF_INTL))
 537                sb->s_d_op = &affs_intl_dentry_operations;
 538        else
 539                sb->s_d_op = &affs_dentry_operations;
 540
 541        sb->s_root = d_make_root(root_inode);
 542        if (!sb->s_root) {
 543                pr_err("AFFS: Get root inode failed\n");
 544                return -ENOMEM;
 545        }
 546
 547        sb->s_export_op = &affs_export_ops;
 548        pr_debug("s_flags=%lX\n", sb->s_flags);
 549        return 0;
 550}
 551
 552static int
 553affs_remount(struct super_block *sb, int *flags, char *data)
 554{
 555        struct affs_sb_info     *sbi = AFFS_SB(sb);
 556        int                      blocksize;
 557        kuid_t                   uid;
 558        kgid_t                   gid;
 559        int                      mode;
 560        int                      reserved;
 561        int                      root_block;
 562        unsigned long            mount_flags;
 563        int                      res = 0;
 564        char                     volume[32];
 565        char                    *prefix = NULL;
 566
 567        pr_debug("%s(flags=0x%x,opts=\"%s\")\n", __func__, *flags, data);
 568
 569        sync_filesystem(sb);
 570        *flags |= SB_NODIRATIME;
 571
 572        memcpy(volume, sbi->s_volume, 32);
 573        if (!parse_options(data, &uid, &gid, &mode, &reserved, &root_block,
 574                           &blocksize, &prefix, volume,
 575                           &mount_flags)) {
 576                kfree(prefix);
 577                return -EINVAL;
 578        }
 579
 580        flush_delayed_work(&sbi->sb_work);
 581
 582        sbi->s_flags = mount_flags;
 583        sbi->s_mode  = mode;
 584        sbi->s_uid   = uid;
 585        sbi->s_gid   = gid;
 586        /* protect against readers */
 587        spin_lock(&sbi->symlink_lock);
 588        if (prefix) {
 589                kfree(sbi->s_prefix);
 590                sbi->s_prefix = prefix;
 591        }
 592        memcpy(sbi->s_volume, volume, 32);
 593        spin_unlock(&sbi->symlink_lock);
 594
 595        if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb))
 596                return 0;
 597
 598        if (*flags & SB_RDONLY)
 599                affs_free_bitmap(sb);
 600        else
 601                res = affs_init_bitmap(sb, flags);
 602
 603        return res;
 604}
 605
 606static int
 607affs_statfs(struct dentry *dentry, struct kstatfs *buf)
 608{
 609        struct super_block *sb = dentry->d_sb;
 610        int              free;
 611        u64              id = huge_encode_dev(sb->s_bdev->bd_dev);
 612
 613        pr_debug("%s() partsize=%d, reserved=%d\n",
 614                 __func__, AFFS_SB(sb)->s_partition_size,
 615                 AFFS_SB(sb)->s_reserved);
 616
 617        free          = affs_count_free_blocks(sb);
 618        buf->f_type    = AFFS_SUPER_MAGIC;
 619        buf->f_bsize   = sb->s_blocksize;
 620        buf->f_blocks  = AFFS_SB(sb)->s_partition_size - AFFS_SB(sb)->s_reserved;
 621        buf->f_bfree   = free;
 622        buf->f_bavail  = free;
 623        buf->f_fsid    = u64_to_fsid(id);
 624        buf->f_namelen = AFFSNAMEMAX;
 625        return 0;
 626}
 627
 628static struct dentry *affs_mount(struct file_system_type *fs_type,
 629        int flags, const char *dev_name, void *data)
 630{
 631        return mount_bdev(fs_type, flags, dev_name, data, affs_fill_super);
 632}
 633
 634static void affs_kill_sb(struct super_block *sb)
 635{
 636        struct affs_sb_info *sbi = AFFS_SB(sb);
 637        kill_block_super(sb);
 638        if (sbi) {
 639                affs_free_bitmap(sb);
 640                affs_brelse(sbi->s_root_bh);
 641                kfree(sbi->s_prefix);
 642                mutex_destroy(&sbi->s_bmlock);
 643                kfree(sbi);
 644        }
 645}
 646
 647static struct file_system_type affs_fs_type = {
 648        .owner          = THIS_MODULE,
 649        .name           = "affs",
 650        .mount          = affs_mount,
 651        .kill_sb        = affs_kill_sb,
 652        .fs_flags       = FS_REQUIRES_DEV,
 653};
 654MODULE_ALIAS_FS("affs");
 655
 656static int __init init_affs_fs(void)
 657{
 658        int err = init_inodecache();
 659        if (err)
 660                goto out1;
 661        err = register_filesystem(&affs_fs_type);
 662        if (err)
 663                goto out;
 664        return 0;
 665out:
 666        destroy_inodecache();
 667out1:
 668        return err;
 669}
 670
 671static void __exit exit_affs_fs(void)
 672{
 673        unregister_filesystem(&affs_fs_type);
 674        destroy_inodecache();
 675}
 676
 677MODULE_DESCRIPTION("Amiga filesystem support for Linux");
 678MODULE_LICENSE("GPL");
 679
 680module_init(init_affs_fs)
 681module_exit(exit_affs_fs)
 682