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/blkdev.h>
  25 #include <linux/f2fs_fs.h>
  26
  27 #include "f2fs.h"
  28 #include "node.h"
  29 #include "segment.h"
  30 #include "xattr.h"
  31
  32 static struct kmem_cache *f2fs_inode_cachep;
  33
  34 enum {
  35         Opt_gc_background_off,
  36         Opt_disable_roll_forward,
  37         Opt_discard,
  38         Opt_noheap,
  39         Opt_nouser_xattr,
  40         Opt_noacl,
  41         Opt_active_logs,
  42         Opt_disable_ext_identify,
  43         Opt_err,
  44 };
  45
  46 static match_table_t f2fs_tokens = {
  47         {Opt_gc_background_off, "background_gc_off"},
  48         {Opt_disable_roll_forward, "disable_roll_forward"},
  49         {Opt_discard, "discard"},
  50         {Opt_noheap, "no_heap"},
  51         {Opt_nouser_xattr, "nouser_xattr"},
  52         {Opt_noacl, "noacl"},
  53         {Opt_active_logs, "active_logs=%u"},
  54         {Opt_disable_ext_identify, "disable_ext_identify"},
  55         {Opt_err, NULL},
  56 };
  57
  58 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
  59 {
  60         struct va_format vaf;
  61         va_list args;
  62
  63         va_start(args, fmt);
  64         vaf.fmt = fmt;
  65         vaf.va = &args;
  66         printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
  67         va_end(args);
  68 }
  69
  70 static void init_once(void *foo)
  71 {
  72         struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
  73
  74         inode_init_once(&fi->vfs_inode);
  75 }
  76
  77 static struct inode *f2fs_alloc_inode(struct super_block *sb)
  78 {
  79         struct f2fs_inode_info *fi;
  80
  81         fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_NOFS | __GFP_ZERO);
  82         if (!fi)
  83                 return NULL;
  84
  85         init_once((void *) fi);
  86
  87         /* Initialize f2fs-specific inode info */
  88         fi->vfs_inode.i_version = 1;
  89         atomic_set(&fi->dirty_dents, 0);
  90         fi->i_current_depth = 1;
  91         fi->i_advise = 0;
  92         rwlock_init(&fi->ext.ext_lock);
  93
  94         set_inode_flag(fi, FI_NEW_INODE);
  95
  96         return &fi->vfs_inode;
  97 }
  98
  99 static void f2fs_i_callback(struct rcu_head *head)
 100 {
 101         struct inode *inode = container_of(head, struct inode, i_rcu);
 102         kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
 103 }
 104
 105 static void f2fs_destroy_inode(struct inode *inode)
 106 {
 107         call_rcu(&inode->i_rcu, f2fs_i_callback);
 108 }
 109
 110 static void f2fs_put_super(struct super_block *sb)
 111 {
 112         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 113
 114         f2fs_destroy_stats(sbi);
 115         stop_gc_thread(sbi);
 116
 117         write_checkpoint(sbi, true);
 118
 119         iput(sbi->node_inode);
 120         iput(sbi->meta_inode);
 121
 122         /* destroy f2fs internal modules */
 123         destroy_node_manager(sbi);
 124         destroy_segment_manager(sbi);
 125
 126         kfree(sbi->ckpt);
 127
 128         sb->s_fs_info = NULL;
 129         brelse(sbi->raw_super_buf);
 130         kfree(sbi);
 131 }
 132
 133 int f2fs_sync_fs(struct super_block *sb, int sync)
 134 {
 135         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 136
 137         if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES))
 138                 return 0;
 139
 140         if (sync) {
 141                 mutex_lock(&sbi->gc_mutex);
 142                 write_checkpoint(sbi, false);
 143                 mutex_unlock(&sbi->gc_mutex);
 144         } else {
 145                 f2fs_balance_fs(sbi);
 146         }
 147
 148         return 0;
 149 }
 150
 151 static int f2fs_freeze(struct super_block *sb)
 152 {
 153         int err;
 154
 155         if (sb->s_flags & MS_RDONLY)
 156                 return 0;
 157
 158         err = f2fs_sync_fs(sb, 1);
 159         return err;
 160 }
 161
 162 static int f2fs_unfreeze(struct super_block *sb)
 163 {
 164         return 0;
 165 }
 166
 167 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
 168 {
 169         struct super_block *sb = dentry->d_sb;
 170         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 171         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 172         block_t total_count, user_block_count, start_count, ovp_count;
 173
 174         total_count = le64_to_cpu(sbi->raw_super->block_count);
 175         user_block_count = sbi->user_block_count;
 176         start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
 177         ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
 178         buf->f_type = F2FS_SUPER_MAGIC;
 179         buf->f_bsize = sbi->blocksize;
 180
 181         buf->f_blocks = total_count - start_count;
 182         buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
 183         buf->f_bavail = user_block_count - valid_user_blocks(sbi);
 184
 185         buf->f_files = sbi->total_node_count;
 186         buf->f_ffree = sbi->total_node_count - valid_inode_count(sbi);
 187
 188         buf->f_namelen = F2FS_NAME_LEN;
 189         buf->f_fsid.val[0] = (u32)id;
 190         buf->f_fsid.val[1] = (u32)(id >> 32);
 191
 192         return 0;
 193 }
 194
 195 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
 196 {
 197         struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
 198
 199         if (test_opt(sbi, BG_GC))
 200                 seq_puts(seq, ",background_gc_on");
 201         else
 202                 seq_puts(seq, ",background_gc_off");
 203         if (test_opt(sbi, DISABLE_ROLL_FORWARD))
 204                 seq_puts(seq, ",disable_roll_forward");
 205         if (test_opt(sbi, DISCARD))
 206                 seq_puts(seq, ",discard");
 207         if (test_opt(sbi, NOHEAP))
 208                 seq_puts(seq, ",no_heap_alloc");
 209 #ifdef CONFIG_F2FS_FS_XATTR
 210         if (test_opt(sbi, XATTR_USER))
 211                 seq_puts(seq, ",user_xattr");
 212         else
 213                 seq_puts(seq, ",nouser_xattr");
 214 #endif
 215 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 216         if (test_opt(sbi, POSIX_ACL))
 217                 seq_puts(seq, ",acl");
 218         else
 219                 seq_puts(seq, ",noacl");
 220 #endif
 221         if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
 222                 seq_puts(seq, ",disable_ext_identify");
 223
 224         seq_printf(seq, ",active_logs=%u", sbi->active_logs);
 225
 226         return 0;
 227 }
 228
 229 static struct super_operations f2fs_sops = {
 230         .alloc_inode    = f2fs_alloc_inode,
 231         .destroy_inode  = f2fs_destroy_inode,
 232         .write_inode    = f2fs_write_inode,
 233         .show_options   = f2fs_show_options,
 234         .evict_inode    = f2fs_evict_inode,
 235         .put_super      = f2fs_put_super,
 236         .sync_fs        = f2fs_sync_fs,
 237         .freeze_fs      = f2fs_freeze,
 238         .unfreeze_fs    = f2fs_unfreeze,
 239         .statfs         = f2fs_statfs,
 240 };
 241
 242 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
 243                 u64 ino, u32 generation)
 244 {
 245         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 246         struct inode *inode;
 247
 248         if (ino < F2FS_ROOT_INO(sbi))
 249                 return ERR_PTR(-ESTALE);
 250
 251         /*
 252          * f2fs_iget isn't quite right if the inode is currently unallocated!
 253          * However f2fs_iget currently does appropriate checks to handle stale
 254          * inodes so everything is OK.
 255          */
 256         inode = f2fs_iget(sb, ino);
 257         if (IS_ERR(inode))
 258                 return ERR_CAST(inode);
 259         if (generation && inode->i_generation != generation) {
 260                 /* we didn't find the right inode.. */
 261                 iput(inode);
 262                 return ERR_PTR(-ESTALE);
 263         }
 264         return inode;
 265 }
 266
 267 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
 268                 int fh_len, int fh_type)
 269 {
 270         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 271                                     f2fs_nfs_get_inode);
 272 }
 273
 274 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
 275                 int fh_len, int fh_type)
 276 {
 277         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 278                                     f2fs_nfs_get_inode);
 279 }
 280
 281 static const struct export_operations f2fs_export_ops = {
 282         .fh_to_dentry = f2fs_fh_to_dentry,
 283         .fh_to_parent = f2fs_fh_to_parent,
 284         .get_parent = f2fs_get_parent,
 285 };
 286
 287 static int parse_options(struct super_block *sb, struct f2fs_sb_info *sbi,
 288                                 char *options)
 289 {
 290         substring_t args[MAX_OPT_ARGS];
 291         char *p;
 292         int arg = 0;
 293
 294         if (!options)
 295                 return 0;
 296
 297         while ((p = strsep(&options, ",")) != NULL) {
 298                 int token;
 299                 if (!*p)
 300                         continue;
 301                 /*
 302                  * Initialize args struct so we know whether arg was
 303                  * found; some options take optional arguments.
 304                  */
 305                 args[0].to = args[0].from = NULL;
 306                 token = match_token(p, f2fs_tokens, args);
 307
 308                 switch (token) {
 309                 case Opt_gc_background_off:
 310                         clear_opt(sbi, BG_GC);
 311                         break;
 312                 case Opt_disable_roll_forward:
 313                         set_opt(sbi, DISABLE_ROLL_FORWARD);
 314                         break;
 315                 case Opt_discard:
 316                         set_opt(sbi, DISCARD);
 317                         break;
 318                 case Opt_noheap:
 319                         set_opt(sbi, NOHEAP);
 320                         break;
 321 #ifdef CONFIG_F2FS_FS_XATTR
 322                 case Opt_nouser_xattr:
 323                         clear_opt(sbi, XATTR_USER);
 324                         break;
 325 #else
 326                 case Opt_nouser_xattr:
 327                         f2fs_msg(sb, KERN_INFO,
 328                                 "nouser_xattr options not supported");
 329                         break;
 330 #endif
 331 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 332                 case Opt_noacl:
 333                         clear_opt(sbi, POSIX_ACL);
 334                         break;
 335 #else
 336                 case Opt_noacl:
 337                         f2fs_msg(sb, KERN_INFO, "noacl options not supported");
 338                         break;
 339 #endif
 340                 case Opt_active_logs:
 341                         if (args->from && match_int(args, &arg))
 342                                 return -EINVAL;
 343                         if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
 344                                 return -EINVAL;
 345                         sbi->active_logs = arg;
 346                         break;
 347                 case Opt_disable_ext_identify:
 348                         set_opt(sbi, DISABLE_EXT_IDENTIFY);
 349                         break;
 350                 default:
 351                         f2fs_msg(sb, KERN_ERR,
 352                                 "Unrecognized mount option \"%s\" or missing value",
 353                                 p);
 354                         return -EINVAL;
 355                 }
 356         }
 357         return 0;
 358 }
 359
 360 static loff_t max_file_size(unsigned bits)
 361 {
 362         loff_t result = ADDRS_PER_INODE;
 363         loff_t leaf_count = ADDRS_PER_BLOCK;
 364
 365         /* two direct node blocks */
 366         result += (leaf_count * 2);
 367
 368         /* two indirect node blocks */
 369         leaf_count *= NIDS_PER_BLOCK;
 370         result += (leaf_count * 2);
 371
 372         /* one double indirect node block */
 373         leaf_count *= NIDS_PER_BLOCK;
 374         result += leaf_count;
 375
 376         result <<= bits;
 377         return result;
 378 }
 379
 380 static int sanity_check_raw_super(struct super_block *sb,
 381                         struct f2fs_super_block *raw_super)
 382 {
 383         unsigned int blocksize;
 384
 385         if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
 386                 f2fs_msg(sb, KERN_INFO,
 387                         "Magic Mismatch, valid(0x%x) - read(0x%x)",
 388                         F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
 389                 return 1;
 390         }
 391
 392         /* Currently, support only 4KB page cache size */
 393         if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
 394                 f2fs_msg(sb, KERN_INFO,
 395                         "Invalid page_cache_size (%lu), supports only 4KB\n",
 396                         PAGE_CACHE_SIZE);
 397                 return 1;
 398         }
 399
 400         /* Currently, support only 4KB block size */
 401         blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
 402         if (blocksize != F2FS_BLKSIZE) {
 403                 f2fs_msg(sb, KERN_INFO,
 404                         "Invalid blocksize (%u), supports only 4KB\n",
 405                         blocksize);
 406                 return 1;
 407         }
 408
 409         if (le32_to_cpu(raw_super->log_sectorsize) !=
 410                                         F2FS_LOG_SECTOR_SIZE) {
 411                 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize");
 412                 return 1;
 413         }
 414         if (le32_to_cpu(raw_super->log_sectors_per_block) !=
 415                                         F2FS_LOG_SECTORS_PER_BLOCK) {
 416                 f2fs_msg(sb, KERN_INFO, "Invalid log sectors per block");
 417                 return 1;
 418         }
 419         return 0;
 420 }
 421
 422 static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
 423 {
 424         unsigned int total, fsmeta;
 425         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
 426         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 427
 428         total = le32_to_cpu(raw_super->segment_count);
 429         fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
 430         fsmeta += le32_to_cpu(raw_super->segment_count_sit);
 431         fsmeta += le32_to_cpu(raw_super->segment_count_nat);
 432         fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
 433         fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
 434
 435         if (fsmeta >= total)
 436                 return 1;
 437
 438         if (is_set_ckpt_flags(ckpt, CP_ERROR_FLAG)) {
 439                 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
 440                 return 1;
 441         }
 442         return 0;
 443 }
 444
 445 static void init_sb_info(struct f2fs_sb_info *sbi)
 446 {
 447         struct f2fs_super_block *raw_super = sbi->raw_super;
 448         int i;
 449
 450         sbi->log_sectors_per_block =
 451                 le32_to_cpu(raw_super->log_sectors_per_block);
 452         sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
 453         sbi->blocksize = 1 << sbi->log_blocksize;
 454         sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
 455         sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
 456         sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
 457         sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
 458         sbi->total_sections = le32_to_cpu(raw_super->section_count);
 459         sbi->total_node_count =
 460                 (le32_to_cpu(raw_super->segment_count_nat) / 2)
 461                         * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
 462         sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
 463         sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
 464         sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
 465         sbi->cur_victim_sec = NULL_SECNO;
 466
 467         for (i = 0; i < NR_COUNT_TYPE; i++)
 468                 atomic_set(&sbi->nr_pages[i], 0);
 469 }
 470
 471 static int validate_superblock(struct super_block *sb,
 472                 struct f2fs_super_block **raw_super,
 473                 struct buffer_head **raw_super_buf, sector_t block)
 474 {
 475         const char *super = (block == 0 ? "first" : "second");
 476
 477         /* read f2fs raw super block */
 478         *raw_super_buf = sb_bread(sb, block);
 479         if (!*raw_super_buf) {
 480                 f2fs_msg(sb, KERN_ERR, "unable to read %s superblock",
 481                                 super);
 482                 return -EIO;
 483         }
 484
 485         *raw_super = (struct f2fs_super_block *)
 486                 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
 487
 488         /* sanity checking of raw super */
 489         if (!sanity_check_raw_super(sb, *raw_super))
 490                 return 0;
 491
 492         f2fs_msg(sb, KERN_ERR, "Can't find a valid F2FS filesystem "
 493                                 "in %s superblock", super);
 494         return -EINVAL;
 495 }
 496
 497 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 498 {
 499         struct f2fs_sb_info *sbi;
 500         struct f2fs_super_block *raw_super;
 501         struct buffer_head *raw_super_buf;
 502         struct inode *root;
 503         long err = -EINVAL;
 504         int i;
 505
 506         /* allocate memory for f2fs-specific super block info */
 507         sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
 508         if (!sbi)
 509                 return -ENOMEM;
 510
 511         /* set a block size */
 512         if (!sb_set_blocksize(sb, F2FS_BLKSIZE)) {
 513                 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
 514                 goto free_sbi;
 515         }
 516
 517         err = validate_superblock(sb, &raw_super, &raw_super_buf, 0);
 518         if (err) {
 519                 brelse(raw_super_buf);
 520                 /* check secondary superblock when primary failed */
 521                 err = validate_superblock(sb, &raw_super, &raw_super_buf, 1);
 522                 if (err)
 523                         goto free_sb_buf;
 524         }
 525         /* init some FS parameters */
 526         sbi->active_logs = NR_CURSEG_TYPE;
 527
 528         set_opt(sbi, BG_GC);
 529
 530 #ifdef CONFIG_F2FS_FS_XATTR
 531         set_opt(sbi, XATTR_USER);
 532 #endif
 533 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 534         set_opt(sbi, POSIX_ACL);
 535 #endif
 536         /* parse mount options */
 537         err = parse_options(sb, sbi, (char *)data);
 538         if (err)
 539                 goto free_sb_buf;
 540
 541         sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
 542         sb->s_max_links = F2FS_LINK_MAX;
 543         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
 544
 545         sb->s_op = &f2fs_sops;
 546         sb->s_xattr = f2fs_xattr_handlers;
 547         sb->s_export_op = &f2fs_export_ops;
 548         sb->s_magic = F2FS_SUPER_MAGIC;
 549         sb->s_fs_info = sbi;
 550         sb->s_time_gran = 1;
 551         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 552                 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
 553         memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
 554
 555         /* init f2fs-specific super block info */
 556         sbi->sb = sb;
 557         sbi->raw_super = raw_super;
 558         sbi->raw_super_buf = raw_super_buf;
 559         mutex_init(&sbi->gc_mutex);
 560         mutex_init(&sbi->writepages);
 561         mutex_init(&sbi->cp_mutex);
 562         for (i = 0; i < NR_GLOBAL_LOCKS; i++)
 563                 mutex_init(&sbi->fs_lock[i]);
 564         mutex_init(&sbi->node_write);
 565         sbi->por_doing = 0;
 566         spin_lock_init(&sbi->stat_lock);
 567         init_rwsem(&sbi->bio_sem);
 568         init_sb_info(sbi);
 569
 570         /* get an inode for meta space */
 571         sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
 572         if (IS_ERR(sbi->meta_inode)) {
 573                 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
 574                 err = PTR_ERR(sbi->meta_inode);
 575                 goto free_sb_buf;
 576         }
 577
 578         err = get_valid_checkpoint(sbi);
 579         if (err) {
 580                 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
 581                 goto free_meta_inode;
 582         }
 583
 584         /* sanity checking of checkpoint */
 585         err = -EINVAL;
 586         if (sanity_check_ckpt(sbi)) {
 587                 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
 588                 goto free_cp;
 589         }
 590
 591         sbi->total_valid_node_count =
 592                                 le32_to_cpu(sbi->ckpt->valid_node_count);
 593         sbi->total_valid_inode_count =
 594                                 le32_to_cpu(sbi->ckpt->valid_inode_count);
 595         sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
 596         sbi->total_valid_block_count =
 597                                 le64_to_cpu(sbi->ckpt->valid_block_count);
 598         sbi->last_valid_block_count = sbi->total_valid_block_count;
 599         sbi->alloc_valid_block_count = 0;
 600         INIT_LIST_HEAD(&sbi->dir_inode_list);
 601         spin_lock_init(&sbi->dir_inode_lock);
 602
 603         init_orphan_info(sbi);
 604
 605         /* setup f2fs internal modules */
 606         err = build_segment_manager(sbi);
 607         if (err) {
 608                 f2fs_msg(sb, KERN_ERR,
 609                         "Failed to initialize F2FS segment manager");
 610                 goto free_sm;
 611         }
 612         err = build_node_manager(sbi);
 613         if (err) {
 614                 f2fs_msg(sb, KERN_ERR,
 615                         "Failed to initialize F2FS node manager");
 616                 goto free_nm;
 617         }
 618
 619         build_gc_manager(sbi);
 620
 621         /* get an inode for node space */
 622         sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
 623         if (IS_ERR(sbi->node_inode)) {
 624                 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
 625                 err = PTR_ERR(sbi->node_inode);
 626                 goto free_nm;
 627         }
 628
 629         /* if there are nt orphan nodes free them */
 630         err = -EINVAL;
 631         if (recover_orphan_inodes(sbi))
 632                 goto free_node_inode;
 633
 634         /* read root inode and dentry */
 635         root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
 636         if (IS_ERR(root)) {
 637                 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
 638                 err = PTR_ERR(root);
 639                 goto free_node_inode;
 640         }
 641         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size)
 642                 goto free_root_inode;
 643
 644         sb->s_root = d_make_root(root); /* allocate root dentry */
 645         if (!sb->s_root) {
 646                 err = -ENOMEM;
 647                 goto free_root_inode;
 648         }
 649
 650         /* recover fsynced data */
 651         if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
 652                 err = recover_fsync_data(sbi);
 653                 if (err) {
 654                         f2fs_msg(sb, KERN_ERR, "Failed to recover fsync data");
 655                         goto free_root_inode;
 656                 }
 657         }
 658
 659         /* After POR, we can run background GC thread */
 660         err = start_gc_thread(sbi);
 661         if (err)
 662                 goto fail;
 663
 664         err = f2fs_build_stats(sbi);
 665         if (err)
 666                 goto fail;
 667
 668         if (test_opt(sbi, DISCARD)) {
 669                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 670                 if (!blk_queue_discard(q))
 671                         f2fs_msg(sb, KERN_WARNING,
 672                                         "mounting with \"discard\" option, but "
 673                                         "the device does not support discard");
 674         }
 675
 676         return 0;
 677 fail:
 678         stop_gc_thread(sbi);
 679 free_root_inode:
 680         dput(sb->s_root);
 681         sb->s_root = NULL;
 682 free_node_inode:
 683         iput(sbi->node_inode);
 684 free_nm:
 685         destroy_node_manager(sbi);
 686 free_sm:
 687         destroy_segment_manager(sbi);
 688 free_cp:
 689         kfree(sbi->ckpt);
 690 free_meta_inode:
 691         make_bad_inode(sbi->meta_inode);
 692         iput(sbi->meta_inode);
 693 free_sb_buf:
 694         brelse(raw_super_buf);
 695 free_sbi:
 696         kfree(sbi);
 697         return err;
 698 }
 699
 700 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
 701                         const char *dev_name, void *data)
 702 {
 703         return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
 704 }
 705
 706 static struct file_system_type f2fs_fs_type = {
 707         .owner          = THIS_MODULE,
 708         .name           = "f2fs",
 709         .mount          = f2fs_mount,
 710         .kill_sb        = kill_block_super,
 711         .fs_flags       = FS_REQUIRES_DEV,
 712 };
 713
 714 static int __init init_inodecache(void)
 715 {
 716         f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
 717                         sizeof(struct f2fs_inode_info), NULL);
 718         if (f2fs_inode_cachep == NULL)
 719                 return -ENOMEM;
 720         return 0;
 721 }
 722
 723 static void destroy_inodecache(void)
 724 {
 725         /*
 726          * Make sure all delayed rcu free inodes are flushed before we
 727          * destroy cache.
 728          */
 729         rcu_barrier();
 730         kmem_cache_destroy(f2fs_inode_cachep);
 731 }
 732
 733 static int __init init_f2fs_fs(void)
 734 {
 735         int err;
 736
 737         err = init_inodecache();
 738         if (err)
 739                 goto fail;
 740         err = create_node_manager_caches();
 741         if (err)
 742                 goto fail;
 743         err = create_gc_caches();
 744         if (err)
 745                 goto fail;
 746         err = create_checkpoint_caches();
 747         if (err)
 748                 goto fail;
 749         err = register_filesystem(&f2fs_fs_type);
 750         if (err)
 751                 goto fail;
 752         f2fs_create_root_stats();
 753 fail:
 754         return err;
 755 }
 756
 757 static void __exit exit_f2fs_fs(void)
 758 {
 759         f2fs_destroy_root_stats();
 760         unregister_filesystem(&f2fs_fs_type);
 761         destroy_checkpoint_caches();
 762         destroy_gc_caches();
 763         destroy_node_manager_caches();
 764         destroy_inodecache();
 765 }
 766
 767 module_init(init_f2fs_fs)
 768 module_exit(exit_f2fs_fs)
 769
 770 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
 771 MODULE_DESCRIPTION("Flash Friendly File System");
 772 MODULE_LICENSE("GPL");