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         memset(fi, 0, sizeof(*fi));
  61         inode_init_once(&fi->vfs_inode);
  62 }
  63
  64 static struct inode *f2fs_alloc_inode(struct super_block *sb)
  65 {
  66         struct f2fs_inode_info *fi;
  67
  68         fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_NOFS | __GFP_ZERO);
  69         if (!fi)
  70                 return NULL;
  71
  72         init_once((void *) fi);
  73
  74         /* Initilize f2fs-specific inode info */
  75         fi->vfs_inode.i_version = 1;
  76         atomic_set(&fi->dirty_dents, 0);
  77         fi->i_current_depth = 1;
  78         fi->i_advise = 0;
  79         rwlock_init(&fi->ext.ext_lock);
  80
  81         set_inode_flag(fi, FI_NEW_INODE);
  82
  83         return &fi->vfs_inode;
  84 }
  85
  86 static void f2fs_i_callback(struct rcu_head *head)
  87 {
  88         struct inode *inode = container_of(head, struct inode, i_rcu);
  89         kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
  90 }
  91
  92 static void f2fs_destroy_inode(struct inode *inode)
  93 {
  94         call_rcu(&inode->i_rcu, f2fs_i_callback);
  95 }
  96
  97 static void f2fs_put_super(struct super_block *sb)
  98 {
  99         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 100
 101         f2fs_destroy_stats(sbi);
 102         stop_gc_thread(sbi);
 103
 104         write_checkpoint(sbi, false, true);
 105
 106         iput(sbi->node_inode);
 107         iput(sbi->meta_inode);
 108
 109         /* destroy f2fs internal modules */
 110         destroy_node_manager(sbi);
 111         destroy_segment_manager(sbi);
 112
 113         kfree(sbi->ckpt);
 114
 115         sb->s_fs_info = NULL;
 116         brelse(sbi->raw_super_buf);
 117         kfree(sbi);
 118 }
 119
 120 int f2fs_sync_fs(struct super_block *sb, int sync)
 121 {
 122         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 123         int ret = 0;
 124
 125         if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES))
 126                 return 0;
 127
 128         if (sync)
 129                 write_checkpoint(sbi, false, false);
 130
 131         return ret;
 132 }
 133
 134 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
 135 {
 136         struct super_block *sb = dentry->d_sb;
 137         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 138         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 139         block_t total_count, user_block_count, start_count, ovp_count;
 140
 141         total_count = le64_to_cpu(sbi->raw_super->block_count);
 142         user_block_count = sbi->user_block_count;
 143         start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
 144         ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
 145         buf->f_type = F2FS_SUPER_MAGIC;
 146         buf->f_bsize = sbi->blocksize;
 147
 148         buf->f_blocks = total_count - start_count;
 149         buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
 150         buf->f_bavail = user_block_count - valid_user_blocks(sbi);
 151
 152         buf->f_files = valid_inode_count(sbi);
 153         buf->f_ffree = sbi->total_node_count - valid_node_count(sbi);
 154
 155         buf->f_namelen = F2FS_MAX_NAME_LEN;
 156         buf->f_fsid.val[0] = (u32)id;
 157         buf->f_fsid.val[1] = (u32)(id >> 32);
 158
 159         return 0;
 160 }
 161
 162 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
 163 {
 164         struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
 165
 166         if (test_opt(sbi, BG_GC))
 167                 seq_puts(seq, ",background_gc_on");
 168         else
 169                 seq_puts(seq, ",background_gc_off");
 170         if (test_opt(sbi, DISABLE_ROLL_FORWARD))
 171                 seq_puts(seq, ",disable_roll_forward");
 172         if (test_opt(sbi, DISCARD))
 173                 seq_puts(seq, ",discard");
 174         if (test_opt(sbi, NOHEAP))
 175                 seq_puts(seq, ",no_heap_alloc");
 176 #ifdef CONFIG_F2FS_FS_XATTR
 177         if (test_opt(sbi, XATTR_USER))
 178                 seq_puts(seq, ",user_xattr");
 179         else
 180                 seq_puts(seq, ",nouser_xattr");
 181 #endif
 182 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 183         if (test_opt(sbi, POSIX_ACL))
 184                 seq_puts(seq, ",acl");
 185         else
 186                 seq_puts(seq, ",noacl");
 187 #endif
 188         if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
 189                 seq_puts(seq, ",disable_ext_indentify");
 190
 191         seq_printf(seq, ",active_logs=%u", sbi->active_logs);
 192
 193         return 0;
 194 }
 195
 196 static struct super_operations f2fs_sops = {
 197         .alloc_inode    = f2fs_alloc_inode,
 198         .destroy_inode  = f2fs_destroy_inode,
 199         .write_inode    = f2fs_write_inode,
 200         .show_options   = f2fs_show_options,
 201         .evict_inode    = f2fs_evict_inode,
 202         .put_super      = f2fs_put_super,
 203         .sync_fs        = f2fs_sync_fs,
 204         .statfs         = f2fs_statfs,
 205 };
 206
 207 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
 208                 u64 ino, u32 generation)
 209 {
 210         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 211         struct inode *inode;
 212
 213         if (ino < F2FS_ROOT_INO(sbi))
 214                 return ERR_PTR(-ESTALE);
 215
 216         /*
 217          * f2fs_iget isn't quite right if the inode is currently unallocated!
 218          * However f2fs_iget currently does appropriate checks to handle stale
 219          * inodes so everything is OK.
 220          */
 221         inode = f2fs_iget(sb, ino);
 222         if (IS_ERR(inode))
 223                 return ERR_CAST(inode);
 224         if (generation && inode->i_generation != generation) {
 225                 /* we didn't find the right inode.. */
 226                 iput(inode);
 227                 return ERR_PTR(-ESTALE);
 228         }
 229         return inode;
 230 }
 231
 232 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
 233                 int fh_len, int fh_type)
 234 {
 235         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 236                                     f2fs_nfs_get_inode);
 237 }
 238
 239 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
 240                 int fh_len, int fh_type)
 241 {
 242         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 243                                     f2fs_nfs_get_inode);
 244 }
 245
 246 static const struct export_operations f2fs_export_ops = {
 247         .fh_to_dentry = f2fs_fh_to_dentry,
 248         .fh_to_parent = f2fs_fh_to_parent,
 249         .get_parent = f2fs_get_parent,
 250 };
 251
 252 static int parse_options(struct f2fs_sb_info *sbi, char *options)
 253 {
 254         substring_t args[MAX_OPT_ARGS];
 255         char *p;
 256         int arg = 0;
 257
 258         if (!options)
 259                 return 0;
 260
 261         while ((p = strsep(&options, ",")) != NULL) {
 262                 int token;
 263                 if (!*p)
 264                         continue;
 265                 /*
 266                  * Initialize args struct so we know whether arg was
 267                  * found; some options take optional arguments.
 268                  */
 269                 args[0].to = args[0].from = NULL;
 270                 token = match_token(p, f2fs_tokens, args);
 271
 272                 switch (token) {
 273                 case Opt_gc_background_off:
 274                         clear_opt(sbi, BG_GC);
 275                         break;
 276                 case Opt_disable_roll_forward:
 277                         set_opt(sbi, DISABLE_ROLL_FORWARD);
 278                         break;
 279                 case Opt_discard:
 280                         set_opt(sbi, DISCARD);
 281                         break;
 282                 case Opt_noheap:
 283                         set_opt(sbi, NOHEAP);
 284                         break;
 285 #ifdef CONFIG_F2FS_FS_XATTR
 286                 case Opt_nouser_xattr:
 287                         clear_opt(sbi, XATTR_USER);
 288                         break;
 289 #else
 290                 case Opt_nouser_xattr:
 291                         pr_info("nouser_xattr options not supported\n");
 292                         break;
 293 #endif
 294 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 295                 case Opt_noacl:
 296                         clear_opt(sbi, POSIX_ACL);
 297                         break;
 298 #else
 299                 case Opt_noacl:
 300                         pr_info("noacl options not supported\n");
 301                         break;
 302 #endif
 303                 case Opt_active_logs:
 304                         if (args->from && match_int(args, &arg))
 305                                 return -EINVAL;
 306                         if (arg != 2 && arg != 4 && arg != 6)
 307                                 return -EINVAL;
 308                         sbi->active_logs = arg;
 309                         break;
 310                 case Opt_disable_ext_identify:
 311                         set_opt(sbi, DISABLE_EXT_IDENTIFY);
 312                         break;
 313                 default:
 314                         pr_err("Unrecognized mount option \"%s\" or missing value\n",
 315                                         p);
 316                         return -EINVAL;
 317                 }
 318         }
 319         return 0;
 320 }
 321
 322 static loff_t max_file_size(unsigned bits)
 323 {
 324         loff_t result = ADDRS_PER_INODE;
 325         loff_t leaf_count = ADDRS_PER_BLOCK;
 326
 327         /* two direct node blocks */
 328         result += (leaf_count * 2);
 329
 330         /* two indirect node blocks */
 331         leaf_count *= NIDS_PER_BLOCK;
 332         result += (leaf_count * 2);
 333
 334         /* one double indirect node block */
 335         leaf_count *= NIDS_PER_BLOCK;
 336         result += leaf_count;
 337
 338         result <<= bits;
 339         return result;
 340 }
 341
 342 static int sanity_check_raw_super(struct f2fs_super_block *raw_super)
 343 {
 344         unsigned int blocksize;
 345
 346         if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic))
 347                 return 1;
 348
 349         /* Currently, support only 4KB block size */
 350         blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
 351         if (blocksize != PAGE_CACHE_SIZE)
 352                 return 1;
 353         if (le32_to_cpu(raw_super->log_sectorsize) !=
 354                                         F2FS_LOG_SECTOR_SIZE)
 355                 return 1;
 356         if (le32_to_cpu(raw_super->log_sectors_per_block) !=
 357                                         F2FS_LOG_SECTORS_PER_BLOCK)
 358                 return 1;
 359         return 0;
 360 }
 361
 362 static int sanity_check_ckpt(struct f2fs_super_block *raw_super,
 363                                 struct f2fs_checkpoint *ckpt)
 364 {
 365         unsigned int total, fsmeta;
 366
 367         total = le32_to_cpu(raw_super->segment_count);
 368         fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
 369         fsmeta += le32_to_cpu(raw_super->segment_count_sit);
 370         fsmeta += le32_to_cpu(raw_super->segment_count_nat);
 371         fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
 372         fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
 373
 374         if (fsmeta >= total)
 375                 return 1;
 376         return 0;
 377 }
 378
 379 static void init_sb_info(struct f2fs_sb_info *sbi)
 380 {
 381         struct f2fs_super_block *raw_super = sbi->raw_super;
 382         int i;
 383
 384         sbi->log_sectors_per_block =
 385                 le32_to_cpu(raw_super->log_sectors_per_block);
 386         sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
 387         sbi->blocksize = 1 << sbi->log_blocksize;
 388         sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
 389         sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
 390         sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
 391         sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
 392         sbi->total_sections = le32_to_cpu(raw_super->section_count);
 393         sbi->total_node_count =
 394                 (le32_to_cpu(raw_super->segment_count_nat) / 2)
 395                         * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
 396         sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
 397         sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
 398         sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
 399
 400         for (i = 0; i < NR_COUNT_TYPE; i++)
 401                 atomic_set(&sbi->nr_pages[i], 0);
 402 }
 403
 404 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 405 {
 406         struct f2fs_sb_info *sbi;
 407         struct f2fs_super_block *raw_super;
 408         struct buffer_head *raw_super_buf;
 409         struct inode *root;
 410         long err = -EINVAL;
 411         int i;
 412
 413         /* allocate memory for f2fs-specific super block info */
 414         sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
 415         if (!sbi)
 416                 return -ENOMEM;
 417
 418         /* set a temporary block size */
 419         if (!sb_set_blocksize(sb, F2FS_BLKSIZE))
 420                 goto free_sbi;
 421
 422         /* read f2fs raw super block */
 423         raw_super_buf = sb_bread(sb, 0);
 424         if (!raw_super_buf) {
 425                 err = -EIO;
 426                 goto free_sbi;
 427         }
 428         raw_super = (struct f2fs_super_block *)
 429                         ((char *)raw_super_buf->b_data + F2FS_SUPER_OFFSET);
 430
 431         /* init some FS parameters */
 432         sbi->active_logs = NR_CURSEG_TYPE;
 433
 434         set_opt(sbi, BG_GC);
 435
 436 #ifdef CONFIG_F2FS_FS_XATTR
 437         set_opt(sbi, XATTR_USER);
 438 #endif
 439 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 440         set_opt(sbi, POSIX_ACL);
 441 #endif
 442         /* parse mount options */
 443         if (parse_options(sbi, (char *)data))
 444                 goto free_sb_buf;
 445
 446         /* sanity checking of raw super */
 447         if (sanity_check_raw_super(raw_super))
 448                 goto free_sb_buf;
 449
 450         sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
 451         sb->s_max_links = F2FS_LINK_MAX;
 452         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
 453
 454         sb->s_op = &f2fs_sops;
 455         sb->s_xattr = f2fs_xattr_handlers;
 456         sb->s_export_op = &f2fs_export_ops;
 457         sb->s_magic = F2FS_SUPER_MAGIC;
 458         sb->s_fs_info = sbi;
 459         sb->s_time_gran = 1;
 460         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 461                 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
 462         memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
 463
 464         /* init f2fs-specific super block info */
 465         sbi->sb = sb;
 466         sbi->raw_super = raw_super;
 467         sbi->raw_super_buf = raw_super_buf;
 468         mutex_init(&sbi->gc_mutex);
 469         mutex_init(&sbi->write_inode);
 470         mutex_init(&sbi->writepages);
 471         mutex_init(&sbi->cp_mutex);
 472         for (i = 0; i < NR_LOCK_TYPE; i++)
 473                 mutex_init(&sbi->fs_lock[i]);
 474         sbi->por_doing = 0;
 475         spin_lock_init(&sbi->stat_lock);
 476         init_rwsem(&sbi->bio_sem);
 477         init_sb_info(sbi);
 478
 479         /* get an inode for meta space */
 480         sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
 481         if (IS_ERR(sbi->meta_inode)) {
 482                 err = PTR_ERR(sbi->meta_inode);
 483                 goto free_sb_buf;
 484         }
 485
 486         err = get_valid_checkpoint(sbi);
 487         if (err)
 488                 goto free_meta_inode;
 489
 490         /* sanity checking of checkpoint */
 491         err = -EINVAL;
 492         if (sanity_check_ckpt(raw_super, sbi->ckpt))
 493                 goto free_cp;
 494
 495         sbi->total_valid_node_count =
 496                                 le32_to_cpu(sbi->ckpt->valid_node_count);
 497         sbi->total_valid_inode_count =
 498                                 le32_to_cpu(sbi->ckpt->valid_inode_count);
 499         sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
 500         sbi->total_valid_block_count =
 501                                 le64_to_cpu(sbi->ckpt->valid_block_count);
 502         sbi->last_valid_block_count = sbi->total_valid_block_count;
 503         sbi->alloc_valid_block_count = 0;
 504         INIT_LIST_HEAD(&sbi->dir_inode_list);
 505         spin_lock_init(&sbi->dir_inode_lock);
 506
 507         /* init super block */
 508         if (!sb_set_blocksize(sb, sbi->blocksize))
 509                 goto free_cp;
 510
 511         init_orphan_info(sbi);
 512
 513         /* setup f2fs internal modules */
 514         err = build_segment_manager(sbi);
 515         if (err)
 516                 goto free_sm;
 517         err = build_node_manager(sbi);
 518         if (err)
 519                 goto free_nm;
 520
 521         build_gc_manager(sbi);
 522
 523         /* get an inode for node space */
 524         sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
 525         if (IS_ERR(sbi->node_inode)) {
 526                 err = PTR_ERR(sbi->node_inode);
 527                 goto free_nm;
 528         }
 529
 530         /* if there are nt orphan nodes free them */
 531         err = -EINVAL;
 532         if (!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG) &&
 533                                 recover_orphan_inodes(sbi))
 534                 goto free_node_inode;
 535
 536         /* read root inode and dentry */
 537         root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
 538         if (IS_ERR(root)) {
 539                 err = PTR_ERR(root);
 540                 goto free_node_inode;
 541         }
 542         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size)
 543                 goto free_root_inode;
 544
 545         sb->s_root = d_make_root(root); /* allocate root dentry */
 546         if (!sb->s_root) {
 547                 err = -ENOMEM;
 548                 goto free_root_inode;
 549         }
 550
 551         /* recover fsynced data */
 552         if (!is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG) &&
 553                                 !test_opt(sbi, DISABLE_ROLL_FORWARD))
 554                 recover_fsync_data(sbi);
 555
 556         /* After POR, we can run background GC thread */
 557         err = start_gc_thread(sbi);
 558         if (err)
 559                 goto fail;
 560
 561         err = f2fs_build_stats(sbi);
 562         if (err)
 563                 goto fail;
 564
 565         return 0;
 566 fail:
 567         stop_gc_thread(sbi);
 568 free_root_inode:
 569         dput(sb->s_root);
 570         sb->s_root = NULL;
 571 free_node_inode:
 572         iput(sbi->node_inode);
 573 free_nm:
 574         destroy_node_manager(sbi);
 575 free_sm:
 576         destroy_segment_manager(sbi);
 577 free_cp:
 578         kfree(sbi->ckpt);
 579 free_meta_inode:
 580         make_bad_inode(sbi->meta_inode);
 581         iput(sbi->meta_inode);
 582 free_sb_buf:
 583         brelse(raw_super_buf);
 584 free_sbi:
 585         kfree(sbi);
 586         return err;
 587 }
 588
 589 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
 590                         const char *dev_name, void *data)
 591 {
 592         return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
 593 }
 594
 595 static struct file_system_type f2fs_fs_type = {
 596         .owner          = THIS_MODULE,
 597         .name           = "f2fs",
 598         .mount          = f2fs_mount,
 599         .kill_sb        = kill_block_super,
 600         .fs_flags       = FS_REQUIRES_DEV,
 601 };
 602
 603 static int init_inodecache(void)
 604 {
 605         f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
 606                         sizeof(struct f2fs_inode_info), NULL);
 607         if (f2fs_inode_cachep == NULL)
 608                 return -ENOMEM;
 609         return 0;
 610 }
 611
 612 static void destroy_inodecache(void)
 613 {
 614         /*
 615          * Make sure all delayed rcu free inodes are flushed before we
 616          * destroy cache.
 617          */
 618         rcu_barrier();
 619         kmem_cache_destroy(f2fs_inode_cachep);
 620 }
 621
 622 static int __init init_f2fs_fs(void)
 623 {
 624         int err;
 625
 626         err = init_inodecache();
 627         if (err)
 628                 goto fail;
 629         err = create_node_manager_caches();
 630         if (err)
 631                 goto fail;
 632         err = create_gc_caches();
 633         if (err)
 634                 goto fail;
 635         err = create_checkpoint_caches();
 636         if (err)
 637                 goto fail;
 638         return register_filesystem(&f2fs_fs_type);
 639 fail:
 640         return err;
 641 }
 642
 643 static void __exit exit_f2fs_fs(void)
 644 {
 645         destroy_root_stats();
 646         unregister_filesystem(&f2fs_fs_type);
 647         destroy_checkpoint_caches();
 648         destroy_gc_caches();
 649         destroy_node_manager_caches();
 650         destroy_inodecache();
 651 }
 652
 653 module_init(init_f2fs_fs)
 654 module_exit(exit_f2fs_fs)
 655
 656 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
 657 MODULE_DESCRIPTION("Flash Friendly File System");
 658 MODULE_LICENSE("GPL");