fs/f2fs/super.c

   1 /*
   2  * fs/f2fs/super.c
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *             http://www.samsung.com/
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/fs.h>
  14 #include <linux/statfs.h>
  15 #include <linux/proc_fs.h>
  16 #include <linux/buffer_head.h>
  17 #include <linux/backing-dev.h>
  18 #include <linux/kthread.h>
  19 #include <linux/parser.h>
  20 #include <linux/mount.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/random.h>
  23 #include <linux/exportfs.h>
  24 #include <linux/f2fs_fs.h>
  25
  26 #include "f2fs.h"
  27 #include "node.h"
  28 #include "xattr.h"
  29
  30 static struct kmem_cache *f2fs_inode_cachep;
  31
  32 enum {
  33         Opt_gc_background_off,
  34         Opt_disable_roll_forward,
  35         Opt_discard,
  36         Opt_noheap,
  37         Opt_nouser_xattr,
  38         Opt_noacl,
  39         Opt_active_logs,
  40         Opt_disable_ext_identify,
  41         Opt_err,
  42 };
  43
  44 static match_table_t f2fs_tokens = {
  45         {Opt_gc_background_off, "background_gc_off"},
  46         {Opt_disable_roll_forward, "disable_roll_forward"},
  47         {Opt_discard, "discard"},
  48         {Opt_noheap, "no_heap"},
  49         {Opt_nouser_xattr, "nouser_xattr"},
  50         {Opt_noacl, "noacl"},
  51         {Opt_active_logs, "active_logs=%u"},
  52         {Opt_disable_ext_identify, "disable_ext_identify"},
  53         {Opt_err, NULL},
  54 };
  55
  56 static void init_once(void *foo)
  57 {
  58         struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
  59
  60         inode_init_once(&fi->vfs_inode);
  61 }
  62
  63 static struct inode *f2fs_alloc_inode(struct super_block *sb)
  64 {
  65         struct f2fs_inode_info *fi;
  66
  67         fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_NOFS | __GFP_ZERO);
  68         if (!fi)
  69                 return NULL;
  70
  71         init_once((void *) fi);
  72
  73         /* Initilize f2fs-specific inode info */
  74         fi->vfs_inode.i_version = 1;
  75         atomic_set(&fi->dirty_dents, 0);
  76         fi->i_current_depth = 1;
  77         fi->i_advise = 0;
  78         rwlock_init(&fi->ext.ext_lock);
  79
  80         set_inode_flag(fi, FI_NEW_INODE);
  81
  82         return &fi->vfs_inode;
  83 }
  84
  85 static void f2fs_i_callback(struct rcu_head *head)
  86 {
  87         struct inode *inode = container_of(head, struct inode, i_rcu);
  88         kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
  89 }
  90
  91 static void f2fs_destroy_inode(struct inode *inode)
  92 {
  93         call_rcu(&inode->i_rcu, f2fs_i_callback);
  94 }
  95
  96 static void f2fs_put_super(struct super_block *sb)
  97 {
  98         struct f2fs_sb_info *sbi = F2FS_SB(sb);
  99
 100         f2fs_destroy_stats(sbi);
 101         stop_gc_thread(sbi);
 102
 103         write_checkpoint(sbi, false, true);
 104
 105         iput(sbi->node_inode);
 106         iput(sbi->meta_inode);
 107
 108         /* destroy f2fs internal modules */
 109         destroy_node_manager(sbi);
 110         destroy_segment_manager(sbi);
 111
 112         kfree(sbi->ckpt);
 113
 114         sb->s_fs_info = NULL;
 115         brelse(sbi->raw_super_buf);
 116         kfree(sbi);
 117 }
 118
 119 int f2fs_sync_fs(struct super_block *sb, int sync)
 120 {
 121         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 122         int ret = 0;
 123
 124         if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES))
 125                 return 0;
 126
 127         if (sync)
 128                 write_checkpoint(sbi, false, false);
 129
 130         return ret;
 131 }
 132
 133 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
 134 {
 135         struct super_block *sb = dentry->d_sb;
 136         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 137         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 138         block_t total_count, user_block_count, start_count, ovp_count;
 139
 140         total_count = le64_to_cpu(sbi->raw_super->block_count);
 141         user_block_count = sbi->user_block_count;
 142         start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
 143         ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
 144         buf->f_type = F2FS_SUPER_MAGIC;
 145         buf->f_bsize = sbi->blocksize;
 146
 147         buf->f_blocks = total_count - start_count;
 148         buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
 149         buf->f_bavail = user_block_count - valid_user_blocks(sbi);
 150
 151         buf->f_files = sbi->total_node_count;
 152         buf->f_ffree = sbi->total_node_count - valid_inode_count(sbi);
 153
 154         buf->f_namelen = F2FS_MAX_NAME_LEN;
 155         buf->f_fsid.val[0] = (u32)id;
 156         buf->f_fsid.val[1] = (u32)(id >> 32);
 157
 158         return 0;
 159 }
 160
 161 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
 162 {
 163         struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
 164
 165         if (test_opt(sbi, BG_GC))
 166                 seq_puts(seq, ",background_gc_on");
 167         else
 168                 seq_puts(seq, ",background_gc_off");
 169         if (test_opt(sbi, DISABLE_ROLL_FORWARD))
 170                 seq_puts(seq, ",disable_roll_forward");
 171         if (test_opt(sbi, DISCARD))
 172                 seq_puts(seq, ",discard");
 173         if (test_opt(sbi, NOHEAP))
 174                 seq_puts(seq, ",no_heap_alloc");
 175 #ifdef CONFIG_F2FS_FS_XATTR
 176         if (test_opt(sbi, XATTR_USER))
 177                 seq_puts(seq, ",user_xattr");
 178         else
 179                 seq_puts(seq, ",nouser_xattr");
 180 #endif
 181 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 182         if (test_opt(sbi, POSIX_ACL))
 183                 seq_puts(seq, ",acl");
 184         else
 185                 seq_puts(seq, ",noacl");
 186 #endif
 187         if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
 188                 seq_puts(seq, ",disable_ext_indentify");
 189
 190         seq_printf(seq, ",active_logs=%u", sbi->active_logs);
 191
 192         return 0;
 193 }
 194
 195 static struct super_operations f2fs_sops = {
 196         .alloc_inode    = f2fs_alloc_inode,
 197         .destroy_inode  = f2fs_destroy_inode,
 198         .write_inode    = f2fs_write_inode,
 199         .show_options   = f2fs_show_options,
 200         .evict_inode    = f2fs_evict_inode,
 201         .put_super      = f2fs_put_super,
 202         .sync_fs        = f2fs_sync_fs,
 203         .statfs         = f2fs_statfs,
 204 };
 205
 206 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
 207                 u64 ino, u32 generation)
 208 {
 209         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 210         struct inode *inode;
 211
 212         if (ino < F2FS_ROOT_INO(sbi))
 213                 return ERR_PTR(-ESTALE);
 214
 215         /*
 216          * f2fs_iget isn't quite right if the inode is currently unallocated!
 217          * However f2fs_iget currently does appropriate checks to handle stale
 218          * inodes so everything is OK.
 219          */
 220         inode = f2fs_iget(sb, ino);
 221         if (IS_ERR(inode))
 222                 return ERR_CAST(inode);
 223         if (generation && inode->i_generation != generation) {
 224                 /* we didn't find the right inode.. */
 225                 iput(inode);
 226                 return ERR_PTR(-ESTALE);
 227         }
 228         return inode;
 229 }
 230
 231 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
 232                 int fh_len, int fh_type)
 233 {
 234         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 235                                     f2fs_nfs_get_inode);
 236 }
 237
 238 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
 239                 int fh_len, int fh_type)
 240 {
 241         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 242                                     f2fs_nfs_get_inode);
 243 }
 244
 245 static const struct export_operations f2fs_export_ops = {
 246         .fh_to_dentry = f2fs_fh_to_dentry,
 247         .fh_to_parent = f2fs_fh_to_parent,
 248         .get_parent = f2fs_get_parent,
 249 };
 250
 251 static int parse_options(struct f2fs_sb_info *sbi, char *options)
 252 {
 253         substring_t args[MAX_OPT_ARGS];
 254         char *p;
 255         int arg = 0;
 256
 257         if (!options)
 258                 return 0;
 259
 260         while ((p = strsep(&options, ",")) != NULL) {
 261                 int token;
 262                 if (!*p)
 263                         continue;
 264                 /*
 265                  * Initialize args struct so we know whether arg was
 266                  * found; some options take optional arguments.
 267                  */
 268                 args[0].to = args[0].from = NULL;
 269                 token = match_token(p, f2fs_tokens, args);
 270
 271                 switch (token) {
 272                 case Opt_gc_background_off:
 273                         clear_opt(sbi, BG_GC);
 274                         break;
 275                 case Opt_disable_roll_forward:
 276                         set_opt(sbi, DISABLE_ROLL_FORWARD);
 277                         break;
 278                 case Opt_discard:
 279                         set_opt(sbi, DISCARD);
 280                         break;
 281                 case Opt_noheap:
 282                         set_opt(sbi, NOHEAP);
 283                         break;
 284 #ifdef CONFIG_F2FS_FS_XATTR
 285                 case Opt_nouser_xattr:
 286                         clear_opt(sbi, XATTR_USER);
 287                         break;
 288 #else
 289                 case Opt_nouser_xattr:
 290                         pr_info("nouser_xattr options not supported\n");
 291                         break;
 292 #endif
 293 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 294                 case Opt_noacl:
 295                         clear_opt(sbi, POSIX_ACL);
 296                         break;
 297 #else
 298                 case Opt_noacl:
 299                         pr_info("noacl options not supported\n");
 300                         break;
 301 #endif
 302                 case Opt_active_logs:
 303                         if (args->from && match_int(args, &arg))
 304                                 return -EINVAL;
 305                         if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
 306                                 return -EINVAL;
 307                         sbi->active_logs = arg;
 308                         break;
 309                 case Opt_disable_ext_identify:
 310                         set_opt(sbi, DISABLE_EXT_IDENTIFY);
 311                         break;
 312                 default:
 313                         pr_err("Unrecognized mount option \"%s\" or missing value\n",
 314                                         p);
 315                         return -EINVAL;
 316                 }
 317         }
 318         return 0;
 319 }
 320
 321 static loff_t max_file_size(unsigned bits)
 322 {
 323         loff_t result = ADDRS_PER_INODE;
 324         loff_t leaf_count = ADDRS_PER_BLOCK;
 325
 326         /* two direct node blocks */
 327         result += (leaf_count * 2);
 328
 329         /* two indirect node blocks */
 330         leaf_count *= NIDS_PER_BLOCK;
 331         result += (leaf_count * 2);
 332
 333         /* one double indirect node block */
 334         leaf_count *= NIDS_PER_BLOCK;
 335         result += leaf_count;
 336
 337         result <<= bits;
 338         return result;
 339 }
 340
 341 static int sanity_check_raw_super(struct f2fs_super_block *raw_super)
 342 {
 343         unsigned int blocksize;
 344
 345         if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic))
 346                 return 1;
 347
 348         /* Currently, support only 4KB block size */
 349         blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
 350         if (blocksize != PAGE_CACHE_SIZE)
 351                 return 1;
 352         if (le32_to_cpu(raw_super->log_sectorsize) !=
 353                                         F2FS_LOG_SECTOR_SIZE)
 354                 return 1;
 355         if (le32_to_cpu(raw_super->log_sectors_per_block) !=
 356                                         F2FS_LOG_SECTORS_PER_BLOCK)
 357                 return 1;
 358         return 0;
 359 }
 360
 361 static int sanity_check_ckpt(struct f2fs_super_block *raw_super,
 362                                 struct f2fs_checkpoint *ckpt)
 363 {
 364         unsigned int total, fsmeta;
 365
 366         total = le32_to_cpu(raw_super->segment_count);
 367         fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
 368         fsmeta += le32_to_cpu(raw_super->segment_count_sit);
 369         fsmeta += le32_to_cpu(raw_super->segment_count_nat);
 370         fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
 371         fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
 372
 373         if (fsmeta >= total)
 374                 return 1;
 375         return 0;
 376 }
 377
 378 static void init_sb_info(struct f2fs_sb_info *sbi)
 379 {
 380         struct f2fs_super_block *raw_super = sbi->raw_super;
 381         int i;
 382
 383         sbi->log_sectors_per_block =
 384                 le32_to_cpu(raw_super->log_sectors_per_block);
 385         sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
 386         sbi->blocksize = 1 << sbi->log_blocksize;
 387         sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
 388         sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
 389         sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
 390         sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
 391         sbi->total_sections = le32_to_cpu(raw_super->section_count);
 392         sbi->total_node_count =
 393                 (le32_to_cpu(raw_super->segment_count_nat) / 2)
 394                         * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
 395         sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
 396         sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
 397         sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
 398
 399         for (i = 0; i < NR_COUNT_TYPE; i++)
 400                 atomic_set(&sbi->nr_pages[i], 0);
 401 }
 402
 403 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 404 {
 405         struct f2fs_sb_info *sbi;
 406         struct f2fs_super_block *raw_super;
 407         struct buffer_head *raw_super_buf;
 408         struct inode *root;
 409         long err = -EINVAL;
 410         int i;
 411
 412         /* allocate memory for f2fs-specific super block info */
 413         sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
 414         if (!sbi)
 415                 return -ENOMEM;
 416
 417         /* set a temporary block size */
 418         if (!sb_set_blocksize(sb, F2FS_BLKSIZE))
 419                 goto free_sbi;
 420
 421         /* read f2fs raw super block */
 422         raw_super_buf = sb_bread(sb, 0);
 423         if (!raw_super_buf) {
 424                 err = -EIO;
 425                 goto free_sbi;
 426         }
 427         raw_super = (struct f2fs_super_block *)
 428                         ((char *)raw_super_buf->b_data + F2FS_SUPER_OFFSET);
 429
 430         /* init some FS parameters */
 431         sbi->active_logs = NR_CURSEG_TYPE;
 432
 433         set_opt(sbi, BG_GC);
 434
 435 #ifdef CONFIG_F2FS_FS_XATTR
 436         set_opt(sbi, XATTR_USER);
 437 #endif
 438 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 439         set_opt(sbi, POSIX_ACL);
 440 #endif
 441         /* parse mount options */
 442         if (parse_options(sbi, (char *)data))
 443                 goto free_sb_buf;
 444
 445         /* sanity checking of raw super */
 446         if (sanity_check_raw_super(raw_super))
 447                 goto free_sb_buf;
 448
 449         sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
 450         sb->s_max_links = F2FS_LINK_MAX;
 451         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
 452
 453         sb->s_op = &f2fs_sops;
 454         sb->s_xattr = f2fs_xattr_handlers;
 455         sb->s_export_op = &f2fs_export_ops;
 456         sb->s_magic = F2FS_SUPER_MAGIC;
 457         sb->s_fs_info = sbi;
 458         sb->s_time_gran = 1;
 459         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 460                 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
 461         memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
 462
 463         /* init f2fs-specific super block info */
 464         sbi->sb = sb;
 465         sbi->raw_super = raw_super;
 466         sbi->raw_super_buf = raw_super_buf;
 467         mutex_init(&sbi->gc_mutex);
 468         mutex_init(&sbi->write_inode);
 469         mutex_init(&sbi->writepages);
 470         mutex_init(&sbi->cp_mutex);
 471         for (i = 0; i < NR_LOCK_TYPE; i++)
 472                 mutex_init(&sbi->fs_lock[i]);
 473         sbi->por_doing = 0;
 474         spin_lock_init(&sbi->stat_lock);
 475         init_rwsem(&sbi->bio_sem);
 476         init_sb_info(sbi);
 477
 478         /* get an inode for meta space */
 479         sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
 480         if (IS_ERR(sbi->meta_inode)) {
 481                 err = PTR_ERR(sbi->meta_inode);
 482                 goto free_sb_buf;
 483         }
 484
 485         err = get_valid_checkpoint(sbi);
 486         if (err)
 487                 goto free_meta_inode;
 488
 489         /* sanity checking of checkpoint */
 490         err = -EINVAL;
 491         if (sanity_check_ckpt(raw_super, sbi->ckpt))
 492                 goto free_cp;
 493
 494         sbi->total_valid_node_count =
 495                                 le32_to_cpu(sbi->ckpt->valid_node_count);
 496         sbi->total_valid_inode_count =
 497                                 le32_to_cpu(sbi->ckpt->valid_inode_count);
 498         sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
 499         sbi->total_valid_block_count =
 500                                 le64_to_cpu(sbi->ckpt->valid_block_count);
 501         sbi->last_valid_block_count = sbi->total_valid_block_count;
 502         sbi->alloc_valid_block_count = 0;
 503         INIT_LIST_HEAD(&sbi->dir_inode_list);
 504         spin_lock_init(&sbi->dir_inode_lock);
 505
 506         /* init super block */
 507         if (!sb_set_blocksize(sb, sbi->blocksize))
 508                 goto free_cp;
 509
 510         init_orphan_info(sbi);
 511
 512         /* setup f2fs internal modules */
 513         err = build_segment_manager(sbi);
 514         if (err)
 515                 goto free_sm;
 516         err = build_node_manager(sbi);
 517         if (err)
 518                 goto free_nm;
 519
 520         build_gc_manager(sbi);
 521
 522         /* get an inode for node space */
 523         sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
 524         if (IS_ERR(sbi->node_inode)) {
 525                 err = PTR_ERR(sbi->node_inode);
 526                 goto free_nm;
 527         }
 528
 529         /* if there are nt orphan nodes free them */
 530         err = -EINVAL;
 531         if (recover_orphan_inodes(sbi))
 532                 goto free_node_inode;
 533
 534         /* read root inode and dentry */
 535         root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
 536         if (IS_ERR(root)) {
 537                 err = PTR_ERR(root);
 538                 goto free_node_inode;
 539         }
 540         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size)
 541                 goto free_root_inode;
 542
 543         sb->s_root = d_make_root(root); /* allocate root dentry */
 544         if (!sb->s_root) {
 545                 err = -ENOMEM;
 546                 goto free_root_inode;
 547         }
 548
 549         /* recover fsynced data */
 550         if (!test_opt(sbi, DISABLE_ROLL_FORWARD))
 551                 recover_fsync_data(sbi);
 552
 553         /* After POR, we can run background GC thread */
 554         err = start_gc_thread(sbi);
 555         if (err)
 556                 goto fail;
 557
 558         err = f2fs_build_stats(sbi);
 559         if (err)
 560                 goto fail;
 561
 562         return 0;
 563 fail:
 564         stop_gc_thread(sbi);
 565 free_root_inode:
 566         dput(sb->s_root);
 567         sb->s_root = NULL;
 568 free_node_inode:
 569         iput(sbi->node_inode);
 570 free_nm:
 571         destroy_node_manager(sbi);
 572 free_sm:
 573         destroy_segment_manager(sbi);
 574 free_cp:
 575         kfree(sbi->ckpt);
 576 free_meta_inode:
 577         make_bad_inode(sbi->meta_inode);
 578         iput(sbi->meta_inode);
 579 free_sb_buf:
 580         brelse(raw_super_buf);
 581 free_sbi:
 582         kfree(sbi);
 583         return err;
 584 }
 585
 586 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
 587                         const char *dev_name, void *data)
 588 {
 589         return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
 590 }
 591
 592 static struct file_system_type f2fs_fs_type = {
 593         .owner          = THIS_MODULE,
 594         .name           = "f2fs",
 595         .mount          = f2fs_mount,
 596         .kill_sb        = kill_block_super,
 597         .fs_flags       = FS_REQUIRES_DEV,
 598 };
 599
 600 static int init_inodecache(void)
 601 {
 602         f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
 603                         sizeof(struct f2fs_inode_info), NULL);
 604         if (f2fs_inode_cachep == NULL)
 605                 return -ENOMEM;
 606         return 0;
 607 }
 608
 609 static void destroy_inodecache(void)
 610 {
 611         /*
 612          * Make sure all delayed rcu free inodes are flushed before we
 613          * destroy cache.
 614          */
 615         rcu_barrier();
 616         kmem_cache_destroy(f2fs_inode_cachep);
 617 }
 618
 619 static int __init init_f2fs_fs(void)
 620 {
 621         int err;
 622
 623         err = init_inodecache();
 624         if (err)
 625                 goto fail;
 626         err = create_node_manager_caches();
 627         if (err)
 628                 goto fail;
 629         err = create_gc_caches();
 630         if (err)
 631                 goto fail;
 632         err = create_checkpoint_caches();
 633         if (err)
 634                 goto fail;
 635         return register_filesystem(&f2fs_fs_type);
 636 fail:
 637         return err;
 638 }
 639
 640 static void __exit exit_f2fs_fs(void)
 641 {
 642         destroy_root_stats();
 643         unregister_filesystem(&f2fs_fs_type);
 644         destroy_checkpoint_caches();
 645         destroy_gc_caches();
 646         destroy_node_manager_caches();
 647         destroy_inodecache();
 648 }
 649
 650 module_init(init_f2fs_fs)
 651 module_exit(exit_f2fs_fs)
 652
 653 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
 654 MODULE_DESCRIPTION("Flash Friendly File System");
 655 MODULE_LICENSE("GPL");