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 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
  57 {
  58         struct va_format vaf;
  59         va_list args;
  60
  61         va_start(args, fmt);
  62         vaf.fmt = fmt;
  63         vaf.va = &args;
  64         printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
  65         va_end(args);
  66 }
  67
  68 static void init_once(void *foo)
  69 {
  70         struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
  71
  72         inode_init_once(&fi->vfs_inode);
  73 }
  74
  75 static struct inode *f2fs_alloc_inode(struct super_block *sb)
  76 {
  77         struct f2fs_inode_info *fi;
  78
  79         fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_NOFS | __GFP_ZERO);
  80         if (!fi)
  81                 return NULL;
  82
  83         init_once((void *) fi);
  84
  85         /* Initilize f2fs-specific inode info */
  86         fi->vfs_inode.i_version = 1;
  87         atomic_set(&fi->dirty_dents, 0);
  88         fi->i_current_depth = 1;
  89         fi->i_advise = 0;
  90         rwlock_init(&fi->ext.ext_lock);
  91
  92         set_inode_flag(fi, FI_NEW_INODE);
  93
  94         return &fi->vfs_inode;
  95 }
  96
  97 static void f2fs_i_callback(struct rcu_head *head)
  98 {
  99         struct inode *inode = container_of(head, struct inode, i_rcu);
 100         kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
 101 }
 102
 103 static void f2fs_destroy_inode(struct inode *inode)
 104 {
 105         call_rcu(&inode->i_rcu, f2fs_i_callback);
 106 }
 107
 108 static void f2fs_put_super(struct super_block *sb)
 109 {
 110         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 111
 112         f2fs_destroy_stats(sbi);
 113         stop_gc_thread(sbi);
 114
 115         write_checkpoint(sbi, false, true);
 116
 117         iput(sbi->node_inode);
 118         iput(sbi->meta_inode);
 119
 120         /* destroy f2fs internal modules */
 121         destroy_node_manager(sbi);
 122         destroy_segment_manager(sbi);
 123
 124         kfree(sbi->ckpt);
 125
 126         sb->s_fs_info = NULL;
 127         brelse(sbi->raw_super_buf);
 128         kfree(sbi);
 129 }
 130
 131 int f2fs_sync_fs(struct super_block *sb, int sync)
 132 {
 133         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 134
 135         if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES))
 136                 return 0;
 137
 138         if (sync)
 139                 write_checkpoint(sbi, false, false);
 140         else
 141                 f2fs_balance_fs(sbi);
 142
 143         return 0;
 144 }
 145
 146 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
 147 {
 148         struct super_block *sb = dentry->d_sb;
 149         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 150         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 151         block_t total_count, user_block_count, start_count, ovp_count;
 152
 153         total_count = le64_to_cpu(sbi->raw_super->block_count);
 154         user_block_count = sbi->user_block_count;
 155         start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
 156         ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
 157         buf->f_type = F2FS_SUPER_MAGIC;
 158         buf->f_bsize = sbi->blocksize;
 159
 160         buf->f_blocks = total_count - start_count;
 161         buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
 162         buf->f_bavail = user_block_count - valid_user_blocks(sbi);
 163
 164         buf->f_files = sbi->total_node_count;
 165         buf->f_ffree = sbi->total_node_count - valid_inode_count(sbi);
 166
 167         buf->f_namelen = F2FS_MAX_NAME_LEN;
 168         buf->f_fsid.val[0] = (u32)id;
 169         buf->f_fsid.val[1] = (u32)(id >> 32);
 170
 171         return 0;
 172 }
 173
 174 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
 175 {
 176         struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
 177
 178         if (test_opt(sbi, BG_GC))
 179                 seq_puts(seq, ",background_gc_on");
 180         else
 181                 seq_puts(seq, ",background_gc_off");
 182         if (test_opt(sbi, DISABLE_ROLL_FORWARD))
 183                 seq_puts(seq, ",disable_roll_forward");
 184         if (test_opt(sbi, DISCARD))
 185                 seq_puts(seq, ",discard");
 186         if (test_opt(sbi, NOHEAP))
 187                 seq_puts(seq, ",no_heap_alloc");
 188 #ifdef CONFIG_F2FS_FS_XATTR
 189         if (test_opt(sbi, XATTR_USER))
 190                 seq_puts(seq, ",user_xattr");
 191         else
 192                 seq_puts(seq, ",nouser_xattr");
 193 #endif
 194 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 195         if (test_opt(sbi, POSIX_ACL))
 196                 seq_puts(seq, ",acl");
 197         else
 198                 seq_puts(seq, ",noacl");
 199 #endif
 200         if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
 201                 seq_puts(seq, ",disable_ext_indentify");
 202
 203         seq_printf(seq, ",active_logs=%u", sbi->active_logs);
 204
 205         return 0;
 206 }
 207
 208 static struct super_operations f2fs_sops = {
 209         .alloc_inode    = f2fs_alloc_inode,
 210         .destroy_inode  = f2fs_destroy_inode,
 211         .write_inode    = f2fs_write_inode,
 212         .show_options   = f2fs_show_options,
 213         .evict_inode    = f2fs_evict_inode,
 214         .put_super      = f2fs_put_super,
 215         .sync_fs        = f2fs_sync_fs,
 216         .statfs         = f2fs_statfs,
 217 };
 218
 219 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
 220                 u64 ino, u32 generation)
 221 {
 222         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 223         struct inode *inode;
 224
 225         if (ino < F2FS_ROOT_INO(sbi))
 226                 return ERR_PTR(-ESTALE);
 227
 228         /*
 229          * f2fs_iget isn't quite right if the inode is currently unallocated!
 230          * However f2fs_iget currently does appropriate checks to handle stale
 231          * inodes so everything is OK.
 232          */
 233         inode = f2fs_iget(sb, ino);
 234         if (IS_ERR(inode))
 235                 return ERR_CAST(inode);
 236         if (generation && inode->i_generation != generation) {
 237                 /* we didn't find the right inode.. */
 238                 iput(inode);
 239                 return ERR_PTR(-ESTALE);
 240         }
 241         return inode;
 242 }
 243
 244 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
 245                 int fh_len, int fh_type)
 246 {
 247         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 248                                     f2fs_nfs_get_inode);
 249 }
 250
 251 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
 252                 int fh_len, int fh_type)
 253 {
 254         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 255                                     f2fs_nfs_get_inode);
 256 }
 257
 258 static const struct export_operations f2fs_export_ops = {
 259         .fh_to_dentry = f2fs_fh_to_dentry,
 260         .fh_to_parent = f2fs_fh_to_parent,
 261         .get_parent = f2fs_get_parent,
 262 };
 263
 264 static int parse_options(struct super_block *sb, struct f2fs_sb_info *sbi,
 265                                 char *options)
 266 {
 267         substring_t args[MAX_OPT_ARGS];
 268         char *p;
 269         int arg = 0;
 270
 271         if (!options)
 272                 return 0;
 273
 274         while ((p = strsep(&options, ",")) != NULL) {
 275                 int token;
 276                 if (!*p)
 277                         continue;
 278                 /*
 279                  * Initialize args struct so we know whether arg was
 280                  * found; some options take optional arguments.
 281                  */
 282                 args[0].to = args[0].from = NULL;
 283                 token = match_token(p, f2fs_tokens, args);
 284
 285                 switch (token) {
 286                 case Opt_gc_background_off:
 287                         clear_opt(sbi, BG_GC);
 288                         break;
 289                 case Opt_disable_roll_forward:
 290                         set_opt(sbi, DISABLE_ROLL_FORWARD);
 291                         break;
 292                 case Opt_discard:
 293                         set_opt(sbi, DISCARD);
 294                         break;
 295                 case Opt_noheap:
 296                         set_opt(sbi, NOHEAP);
 297                         break;
 298 #ifdef CONFIG_F2FS_FS_XATTR
 299                 case Opt_nouser_xattr:
 300                         clear_opt(sbi, XATTR_USER);
 301                         break;
 302 #else
 303                 case Opt_nouser_xattr:
 304                         f2fs_msg(sb, KERN_INFO,
 305                                 "nouser_xattr options not supported");
 306                         break;
 307 #endif
 308 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 309                 case Opt_noacl:
 310                         clear_opt(sbi, POSIX_ACL);
 311                         break;
 312 #else
 313                 case Opt_noacl:
 314                         f2fs_msg(sb, KERN_INFO, "noacl options not supported");
 315                         break;
 316 #endif
 317                 case Opt_active_logs:
 318                         if (args->from && match_int(args, &arg))
 319                                 return -EINVAL;
 320                         if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
 321                                 return -EINVAL;
 322                         sbi->active_logs = arg;
 323                         break;
 324                 case Opt_disable_ext_identify:
 325                         set_opt(sbi, DISABLE_EXT_IDENTIFY);
 326                         break;
 327                 default:
 328                         f2fs_msg(sb, KERN_ERR,
 329                                 "Unrecognized mount option \"%s\" or missing value",
 330                                 p);
 331                         return -EINVAL;
 332                 }
 333         }
 334         return 0;
 335 }
 336
 337 static loff_t max_file_size(unsigned bits)
 338 {
 339         loff_t result = ADDRS_PER_INODE;
 340         loff_t leaf_count = ADDRS_PER_BLOCK;
 341
 342         /* two direct node blocks */
 343         result += (leaf_count * 2);
 344
 345         /* two indirect node blocks */
 346         leaf_count *= NIDS_PER_BLOCK;
 347         result += (leaf_count * 2);
 348
 349         /* one double indirect node block */
 350         leaf_count *= NIDS_PER_BLOCK;
 351         result += leaf_count;
 352
 353         result <<= bits;
 354         return result;
 355 }
 356
 357 static int sanity_check_raw_super(struct super_block *sb,
 358                         struct f2fs_super_block *raw_super)
 359 {
 360         unsigned int blocksize;
 361
 362         if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
 363                 f2fs_msg(sb, KERN_INFO,
 364                         "Magic Mismatch, valid(0x%x) - read(0x%x)",
 365                         F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
 366                 return 1;
 367         }
 368
 369         /* Currently, support only 4KB block size */
 370         blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
 371         if (blocksize != PAGE_CACHE_SIZE) {
 372                 f2fs_msg(sb, KERN_INFO,
 373                         "Invalid blocksize (%u), supports only 4KB\n",
 374                         blocksize);
 375                 return 1;
 376         }
 377         if (le32_to_cpu(raw_super->log_sectorsize) !=
 378                                         F2FS_LOG_SECTOR_SIZE) {
 379                 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize");
 380                 return 1;
 381         }
 382         if (le32_to_cpu(raw_super->log_sectors_per_block) !=
 383                                         F2FS_LOG_SECTORS_PER_BLOCK) {
 384                 f2fs_msg(sb, KERN_INFO, "Invalid log sectors per block");
 385                 return 1;
 386         }
 387         return 0;
 388 }
 389
 390 static int sanity_check_ckpt(struct f2fs_super_block *raw_super,
 391                                 struct f2fs_checkpoint *ckpt)
 392 {
 393         unsigned int total, fsmeta;
 394
 395         total = le32_to_cpu(raw_super->segment_count);
 396         fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
 397         fsmeta += le32_to_cpu(raw_super->segment_count_sit);
 398         fsmeta += le32_to_cpu(raw_super->segment_count_nat);
 399         fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
 400         fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
 401
 402         if (fsmeta >= total)
 403                 return 1;
 404         return 0;
 405 }
 406
 407 static void init_sb_info(struct f2fs_sb_info *sbi)
 408 {
 409         struct f2fs_super_block *raw_super = sbi->raw_super;
 410         int i;
 411
 412         sbi->log_sectors_per_block =
 413                 le32_to_cpu(raw_super->log_sectors_per_block);
 414         sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
 415         sbi->blocksize = 1 << sbi->log_blocksize;
 416         sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
 417         sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
 418         sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
 419         sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
 420         sbi->total_sections = le32_to_cpu(raw_super->section_count);
 421         sbi->total_node_count =
 422                 (le32_to_cpu(raw_super->segment_count_nat) / 2)
 423                         * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
 424         sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
 425         sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
 426         sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
 427
 428         for (i = 0; i < NR_COUNT_TYPE; i++)
 429                 atomic_set(&sbi->nr_pages[i], 0);
 430 }
 431
 432 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 433 {
 434         struct f2fs_sb_info *sbi;
 435         struct f2fs_super_block *raw_super;
 436         struct buffer_head *raw_super_buf;
 437         struct inode *root;
 438         long err = -EINVAL;
 439         int i;
 440
 441         /* allocate memory for f2fs-specific super block info */
 442         sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
 443         if (!sbi)
 444                 return -ENOMEM;
 445
 446         /* set a block size */
 447         if (!sb_set_blocksize(sb, F2FS_BLKSIZE)) {
 448                 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
 449                 goto free_sbi;
 450         }
 451
 452         /* read f2fs raw super block */
 453         raw_super_buf = sb_bread(sb, 0);
 454         if (!raw_super_buf) {
 455                 err = -EIO;
 456                 f2fs_msg(sb, KERN_ERR, "unable to read superblock");
 457                 goto free_sbi;
 458         }
 459         raw_super = (struct f2fs_super_block *)
 460                         ((char *)raw_super_buf->b_data + F2FS_SUPER_OFFSET);
 461
 462         /* init some FS parameters */
 463         sbi->active_logs = NR_CURSEG_TYPE;
 464
 465         set_opt(sbi, BG_GC);
 466
 467 #ifdef CONFIG_F2FS_FS_XATTR
 468         set_opt(sbi, XATTR_USER);
 469 #endif
 470 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 471         set_opt(sbi, POSIX_ACL);
 472 #endif
 473         /* parse mount options */
 474         if (parse_options(sb, sbi, (char *)data))
 475                 goto free_sb_buf;
 476
 477         /* sanity checking of raw super */
 478         if (sanity_check_raw_super(sb, raw_super)) {
 479                 f2fs_msg(sb, KERN_ERR, "Can't find a valid F2FS filesystem");
 480                 goto free_sb_buf;
 481         }
 482
 483         sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
 484         sb->s_max_links = F2FS_LINK_MAX;
 485         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
 486
 487         sb->s_op = &f2fs_sops;
 488         sb->s_xattr = f2fs_xattr_handlers;
 489         sb->s_export_op = &f2fs_export_ops;
 490         sb->s_magic = F2FS_SUPER_MAGIC;
 491         sb->s_fs_info = sbi;
 492         sb->s_time_gran = 1;
 493         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 494                 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
 495         memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
 496
 497         /* init f2fs-specific super block info */
 498         sbi->sb = sb;
 499         sbi->raw_super = raw_super;
 500         sbi->raw_super_buf = raw_super_buf;
 501         mutex_init(&sbi->gc_mutex);
 502         mutex_init(&sbi->write_inode);
 503         mutex_init(&sbi->writepages);
 504         mutex_init(&sbi->cp_mutex);
 505         for (i = 0; i < NR_LOCK_TYPE; i++)
 506                 mutex_init(&sbi->fs_lock[i]);
 507         sbi->por_doing = 0;
 508         spin_lock_init(&sbi->stat_lock);
 509         init_rwsem(&sbi->bio_sem);
 510         init_sb_info(sbi);
 511
 512         /* get an inode for meta space */
 513         sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
 514         if (IS_ERR(sbi->meta_inode)) {
 515                 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
 516                 err = PTR_ERR(sbi->meta_inode);
 517                 goto free_sb_buf;
 518         }
 519
 520         err = get_valid_checkpoint(sbi);
 521         if (err) {
 522                 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
 523                 goto free_meta_inode;
 524         }
 525
 526         /* sanity checking of checkpoint */
 527         err = -EINVAL;
 528         if (sanity_check_ckpt(raw_super, sbi->ckpt)) {
 529                 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
 530                 goto free_cp;
 531         }
 532
 533         sbi->total_valid_node_count =
 534                                 le32_to_cpu(sbi->ckpt->valid_node_count);
 535         sbi->total_valid_inode_count =
 536                                 le32_to_cpu(sbi->ckpt->valid_inode_count);
 537         sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
 538         sbi->total_valid_block_count =
 539                                 le64_to_cpu(sbi->ckpt->valid_block_count);
 540         sbi->last_valid_block_count = sbi->total_valid_block_count;
 541         sbi->alloc_valid_block_count = 0;
 542         INIT_LIST_HEAD(&sbi->dir_inode_list);
 543         spin_lock_init(&sbi->dir_inode_lock);
 544
 545         init_orphan_info(sbi);
 546
 547         /* setup f2fs internal modules */
 548         err = build_segment_manager(sbi);
 549         if (err) {
 550                 f2fs_msg(sb, KERN_ERR,
 551                         "Failed to initialize F2FS segment manager");
 552                 goto free_sm;
 553         }
 554         err = build_node_manager(sbi);
 555         if (err) {
 556                 f2fs_msg(sb, KERN_ERR,
 557                         "Failed to initialize F2FS node manager");
 558                 goto free_nm;
 559         }
 560
 561         build_gc_manager(sbi);
 562
 563         /* get an inode for node space */
 564         sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
 565         if (IS_ERR(sbi->node_inode)) {
 566                 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
 567                 err = PTR_ERR(sbi->node_inode);
 568                 goto free_nm;
 569         }
 570
 571         /* if there are nt orphan nodes free them */
 572         err = -EINVAL;
 573         if (recover_orphan_inodes(sbi))
 574                 goto free_node_inode;
 575
 576         /* read root inode and dentry */
 577         root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
 578         if (IS_ERR(root)) {
 579                 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
 580                 err = PTR_ERR(root);
 581                 goto free_node_inode;
 582         }
 583         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size)
 584                 goto free_root_inode;
 585
 586         sb->s_root = d_make_root(root); /* allocate root dentry */
 587         if (!sb->s_root) {
 588                 err = -ENOMEM;
 589                 goto free_root_inode;
 590         }
 591
 592         /* recover fsynced data */
 593         if (!test_opt(sbi, DISABLE_ROLL_FORWARD))
 594                 recover_fsync_data(sbi);
 595
 596         /* After POR, we can run background GC thread */
 597         err = start_gc_thread(sbi);
 598         if (err)
 599                 goto fail;
 600
 601         err = f2fs_build_stats(sbi);
 602         if (err)
 603                 goto fail;
 604
 605         return 0;
 606 fail:
 607         stop_gc_thread(sbi);
 608 free_root_inode:
 609         dput(sb->s_root);
 610         sb->s_root = NULL;
 611 free_node_inode:
 612         iput(sbi->node_inode);
 613 free_nm:
 614         destroy_node_manager(sbi);
 615 free_sm:
 616         destroy_segment_manager(sbi);
 617 free_cp:
 618         kfree(sbi->ckpt);
 619 free_meta_inode:
 620         make_bad_inode(sbi->meta_inode);
 621         iput(sbi->meta_inode);
 622 free_sb_buf:
 623         brelse(raw_super_buf);
 624 free_sbi:
 625         kfree(sbi);
 626         return err;
 627 }
 628
 629 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
 630                         const char *dev_name, void *data)
 631 {
 632         return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
 633 }
 634
 635 static struct file_system_type f2fs_fs_type = {
 636         .owner          = THIS_MODULE,
 637         .name           = "f2fs",
 638         .mount          = f2fs_mount,
 639         .kill_sb        = kill_block_super,
 640         .fs_flags       = FS_REQUIRES_DEV,
 641 };
 642
 643 static int __init init_inodecache(void)
 644 {
 645         f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
 646                         sizeof(struct f2fs_inode_info), NULL);
 647         if (f2fs_inode_cachep == NULL)
 648                 return -ENOMEM;
 649         return 0;
 650 }
 651
 652 static void destroy_inodecache(void)
 653 {
 654         /*
 655          * Make sure all delayed rcu free inodes are flushed before we
 656          * destroy cache.
 657          */
 658         rcu_barrier();
 659         kmem_cache_destroy(f2fs_inode_cachep);
 660 }
 661
 662 static int __init init_f2fs_fs(void)
 663 {
 664         int err;
 665
 666         err = init_inodecache();
 667         if (err)
 668                 goto fail;
 669         err = create_node_manager_caches();
 670         if (err)
 671                 goto fail;
 672         err = create_gc_caches();
 673         if (err)
 674                 goto fail;
 675         err = create_checkpoint_caches();
 676         if (err)
 677                 goto fail;
 678         err = register_filesystem(&f2fs_fs_type);
 679         if (err)
 680                 goto fail;
 681         f2fs_create_root_stats();
 682 fail:
 683         return err;
 684 }
 685
 686 static void __exit exit_f2fs_fs(void)
 687 {
 688         f2fs_destroy_root_stats();
 689         unregister_filesystem(&f2fs_fs_type);
 690         destroy_checkpoint_caches();
 691         destroy_gc_caches();
 692         destroy_node_manager_caches();
 693         destroy_inodecache();
 694 }
 695
 696 module_init(init_f2fs_fs)
 697 module_exit(exit_f2fs_fs)
 698
 699 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
 700 MODULE_DESCRIPTION("Flash Friendly File System");
 701 MODULE_LICENSE("GPL");