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