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/buffer_head.h>
  16 #include <linux/backing-dev.h>
  17 #include <linux/kthread.h>
  18 #include <linux/parser.h>
  19 #include <linux/mount.h>
  20 #include <linux/seq_file.h>
  21 #include <linux/random.h>
  22 #include <linux/exportfs.h>
  23 #include <linux/blkdev.h>
  24 #include <linux/f2fs_fs.h>
  25
  26 #include "f2fs.h"
  27 #include "node.h"
  28 #include "segment.h"
  29 #include "xattr.h"
  30
  31 #define CREATE_TRACE_POINTS
  32 #include <trace/events/f2fs.h>
  33
  34 static struct kmem_cache *f2fs_inode_cachep;
  35
  36 enum {
  37         Opt_gc_background_off,
  38         Opt_disable_roll_forward,
  39         Opt_discard,
  40         Opt_noheap,
  41         Opt_nouser_xattr,
  42         Opt_noacl,
  43         Opt_active_logs,
  44         Opt_disable_ext_identify,
  45         Opt_err,
  46 };
  47
  48 static match_table_t f2fs_tokens = {
  49         {Opt_gc_background_off, "background_gc_off"},
  50         {Opt_disable_roll_forward, "disable_roll_forward"},
  51         {Opt_discard, "discard"},
  52         {Opt_noheap, "no_heap"},
  53         {Opt_nouser_xattr, "nouser_xattr"},
  54         {Opt_noacl, "noacl"},
  55         {Opt_active_logs, "active_logs=%u"},
  56         {Opt_disable_ext_identify, "disable_ext_identify"},
  57         {Opt_err, NULL},
  58 };
  59
  60 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
  61 {
  62         struct va_format vaf;
  63         va_list args;
  64
  65         va_start(args, fmt);
  66         vaf.fmt = fmt;
  67         vaf.va = &args;
  68         printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
  69         va_end(args);
  70 }
  71
  72 static void init_once(void *foo)
  73 {
  74         struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
  75
  76         inode_init_once(&fi->vfs_inode);
  77 }
  78
  79 static struct inode *f2fs_alloc_inode(struct super_block *sb)
  80 {
  81         struct f2fs_inode_info *fi;
  82
  83         fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_NOFS | __GFP_ZERO);
  84         if (!fi)
  85                 return NULL;
  86
  87         init_once((void *) fi);
  88
  89         /* Initialize f2fs-specific inode info */
  90         fi->vfs_inode.i_version = 1;
  91         atomic_set(&fi->dirty_dents, 0);
  92         fi->i_current_depth = 1;
  93         fi->i_advise = 0;
  94         rwlock_init(&fi->ext.ext_lock);
  95
  96         set_inode_flag(fi, FI_NEW_INODE);
  97
  98         return &fi->vfs_inode;
  99 }
 100
 101 static int f2fs_drop_inode(struct inode *inode)
 102 {
 103         /*
 104          * This is to avoid a deadlock condition like below.
 105          * writeback_single_inode(inode)
 106          *  - f2fs_write_data_page
 107          *    - f2fs_gc -> iput -> evict
 108          *       - inode_wait_for_writeback(inode)
 109          */
 110         if (!inode_unhashed(inode) && inode->i_state & I_SYNC)
 111                 return 0;
 112         return generic_drop_inode(inode);
 113 }
 114
 115 /*
 116  * f2fs_dirty_inode() is called from __mark_inode_dirty()
 117  *
 118  * We should call set_dirty_inode to write the dirty inode through write_inode.
 119  */
 120 static void f2fs_dirty_inode(struct inode *inode, int flags)
 121 {
 122         set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
 123         return;
 124 }
 125
 126 static void f2fs_i_callback(struct rcu_head *head)
 127 {
 128         struct inode *inode = container_of(head, struct inode, i_rcu);
 129         kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
 130 }
 131
 132 static void f2fs_destroy_inode(struct inode *inode)
 133 {
 134         call_rcu(&inode->i_rcu, f2fs_i_callback);
 135 }
 136
 137 static void f2fs_put_super(struct super_block *sb)
 138 {
 139         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 140
 141         f2fs_destroy_stats(sbi);
 142         stop_gc_thread(sbi);
 143
 144         write_checkpoint(sbi, true);
 145
 146         iput(sbi->node_inode);
 147         iput(sbi->meta_inode);
 148
 149         /* destroy f2fs internal modules */
 150         destroy_node_manager(sbi);
 151         destroy_segment_manager(sbi);
 152
 153         kfree(sbi->ckpt);
 154
 155         sb->s_fs_info = NULL;
 156         brelse(sbi->raw_super_buf);
 157         kfree(sbi);
 158 }
 159
 160 int f2fs_sync_fs(struct super_block *sb, int sync)
 161 {
 162         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 163
 164         trace_f2fs_sync_fs(sb, sync);
 165
 166         if (!sbi->s_dirty && !get_pages(sbi, F2FS_DIRTY_NODES))
 167                 return 0;
 168
 169         if (sync) {
 170                 mutex_lock(&sbi->gc_mutex);
 171                 write_checkpoint(sbi, false);
 172                 mutex_unlock(&sbi->gc_mutex);
 173         } else {
 174                 f2fs_balance_fs(sbi);
 175         }
 176
 177         return 0;
 178 }
 179
 180 static int f2fs_freeze(struct super_block *sb)
 181 {
 182         int err;
 183
 184         if (f2fs_readonly(sb))
 185                 return 0;
 186
 187         err = f2fs_sync_fs(sb, 1);
 188         return err;
 189 }
 190
 191 static int f2fs_unfreeze(struct super_block *sb)
 192 {
 193         return 0;
 194 }
 195
 196 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
 197 {
 198         struct super_block *sb = dentry->d_sb;
 199         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 200         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 201         block_t total_count, user_block_count, start_count, ovp_count;
 202
 203         total_count = le64_to_cpu(sbi->raw_super->block_count);
 204         user_block_count = sbi->user_block_count;
 205         start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
 206         ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
 207         buf->f_type = F2FS_SUPER_MAGIC;
 208         buf->f_bsize = sbi->blocksize;
 209
 210         buf->f_blocks = total_count - start_count;
 211         buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
 212         buf->f_bavail = user_block_count - valid_user_blocks(sbi);
 213
 214         buf->f_files = sbi->total_node_count;
 215         buf->f_ffree = sbi->total_node_count - valid_inode_count(sbi);
 216
 217         buf->f_namelen = F2FS_NAME_LEN;
 218         buf->f_fsid.val[0] = (u32)id;
 219         buf->f_fsid.val[1] = (u32)(id >> 32);
 220
 221         return 0;
 222 }
 223
 224 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
 225 {
 226         struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
 227
 228         if (test_opt(sbi, BG_GC))
 229                 seq_puts(seq, ",background_gc_on");
 230         else
 231                 seq_puts(seq, ",background_gc_off");
 232         if (test_opt(sbi, DISABLE_ROLL_FORWARD))
 233                 seq_puts(seq, ",disable_roll_forward");
 234         if (test_opt(sbi, DISCARD))
 235                 seq_puts(seq, ",discard");
 236         if (test_opt(sbi, NOHEAP))
 237                 seq_puts(seq, ",no_heap_alloc");
 238 #ifdef CONFIG_F2FS_FS_XATTR
 239         if (test_opt(sbi, XATTR_USER))
 240                 seq_puts(seq, ",user_xattr");
 241         else
 242                 seq_puts(seq, ",nouser_xattr");
 243 #endif
 244 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 245         if (test_opt(sbi, POSIX_ACL))
 246                 seq_puts(seq, ",acl");
 247         else
 248                 seq_puts(seq, ",noacl");
 249 #endif
 250         if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
 251                 seq_puts(seq, ",disable_ext_identify");
 252
 253         seq_printf(seq, ",active_logs=%u", sbi->active_logs);
 254
 255         return 0;
 256 }
 257
 258 static struct super_operations f2fs_sops = {
 259         .alloc_inode    = f2fs_alloc_inode,
 260         .drop_inode     = f2fs_drop_inode,
 261         .destroy_inode  = f2fs_destroy_inode,
 262         .write_inode    = f2fs_write_inode,
 263         .dirty_inode    = f2fs_dirty_inode,
 264         .show_options   = f2fs_show_options,
 265         .evict_inode    = f2fs_evict_inode,
 266         .put_super      = f2fs_put_super,
 267         .sync_fs        = f2fs_sync_fs,
 268         .freeze_fs      = f2fs_freeze,
 269         .unfreeze_fs    = f2fs_unfreeze,
 270         .statfs         = f2fs_statfs,
 271 };
 272
 273 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
 274                 u64 ino, u32 generation)
 275 {
 276         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 277         struct inode *inode;
 278
 279         if (ino < F2FS_ROOT_INO(sbi))
 280                 return ERR_PTR(-ESTALE);
 281
 282         /*
 283          * f2fs_iget isn't quite right if the inode is currently unallocated!
 284          * However f2fs_iget currently does appropriate checks to handle stale
 285          * inodes so everything is OK.
 286          */
 287         inode = f2fs_iget(sb, ino);
 288         if (IS_ERR(inode))
 289                 return ERR_CAST(inode);
 290         if (generation && inode->i_generation != generation) {
 291                 /* we didn't find the right inode.. */
 292                 iput(inode);
 293                 return ERR_PTR(-ESTALE);
 294         }
 295         return inode;
 296 }
 297
 298 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
 299                 int fh_len, int fh_type)
 300 {
 301         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 302                                     f2fs_nfs_get_inode);
 303 }
 304
 305 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
 306                 int fh_len, int fh_type)
 307 {
 308         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 309                                     f2fs_nfs_get_inode);
 310 }
 311
 312 static const struct export_operations f2fs_export_ops = {
 313         .fh_to_dentry = f2fs_fh_to_dentry,
 314         .fh_to_parent = f2fs_fh_to_parent,
 315         .get_parent = f2fs_get_parent,
 316 };
 317
 318 static int parse_options(struct super_block *sb, char *options)
 319 {
 320         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 321         substring_t args[MAX_OPT_ARGS];
 322         char *p;
 323         int arg = 0;
 324
 325         if (!options)
 326                 return 0;
 327
 328         while ((p = strsep(&options, ",")) != NULL) {
 329                 int token;
 330                 if (!*p)
 331                         continue;
 332                 /*
 333                  * Initialize args struct so we know whether arg was
 334                  * found; some options take optional arguments.
 335                  */
 336                 args[0].to = args[0].from = NULL;
 337                 token = match_token(p, f2fs_tokens, args);
 338
 339                 switch (token) {
 340                 case Opt_gc_background_off:
 341                         clear_opt(sbi, BG_GC);
 342                         break;
 343                 case Opt_disable_roll_forward:
 344                         set_opt(sbi, DISABLE_ROLL_FORWARD);
 345                         break;
 346                 case Opt_discard:
 347                         set_opt(sbi, DISCARD);
 348                         break;
 349                 case Opt_noheap:
 350                         set_opt(sbi, NOHEAP);
 351                         break;
 352 #ifdef CONFIG_F2FS_FS_XATTR
 353                 case Opt_nouser_xattr:
 354                         clear_opt(sbi, XATTR_USER);
 355                         break;
 356 #else
 357                 case Opt_nouser_xattr:
 358                         f2fs_msg(sb, KERN_INFO,
 359                                 "nouser_xattr options not supported");
 360                         break;
 361 #endif
 362 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 363                 case Opt_noacl:
 364                         clear_opt(sbi, POSIX_ACL);
 365                         break;
 366 #else
 367                 case Opt_noacl:
 368                         f2fs_msg(sb, KERN_INFO, "noacl options not supported");
 369                         break;
 370 #endif
 371                 case Opt_active_logs:
 372                         if (args->from && match_int(args, &arg))
 373                                 return -EINVAL;
 374                         if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
 375                                 return -EINVAL;
 376                         sbi->active_logs = arg;
 377                         break;
 378                 case Opt_disable_ext_identify:
 379                         set_opt(sbi, DISABLE_EXT_IDENTIFY);
 380                         break;
 381                 default:
 382                         f2fs_msg(sb, KERN_ERR,
 383                                 "Unrecognized mount option \"%s\" or missing value",
 384                                 p);
 385                         return -EINVAL;
 386                 }
 387         }
 388         return 0;
 389 }
 390
 391 static loff_t max_file_size(unsigned bits)
 392 {
 393         loff_t result = ADDRS_PER_INODE;
 394         loff_t leaf_count = ADDRS_PER_BLOCK;
 395
 396         /* two direct node blocks */
 397         result += (leaf_count * 2);
 398
 399         /* two indirect node blocks */
 400         leaf_count *= NIDS_PER_BLOCK;
 401         result += (leaf_count * 2);
 402
 403         /* one double indirect node block */
 404         leaf_count *= NIDS_PER_BLOCK;
 405         result += leaf_count;
 406
 407         result <<= bits;
 408         return result;
 409 }
 410
 411 static int sanity_check_raw_super(struct super_block *sb,
 412                         struct f2fs_super_block *raw_super)
 413 {
 414         unsigned int blocksize;
 415
 416         if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
 417                 f2fs_msg(sb, KERN_INFO,
 418                         "Magic Mismatch, valid(0x%x) - read(0x%x)",
 419                         F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
 420                 return 1;
 421         }
 422
 423         /* Currently, support only 4KB page cache size */
 424         if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
 425                 f2fs_msg(sb, KERN_INFO,
 426                         "Invalid page_cache_size (%lu), supports only 4KB\n",
 427                         PAGE_CACHE_SIZE);
 428                 return 1;
 429         }
 430
 431         /* Currently, support only 4KB block size */
 432         blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
 433         if (blocksize != F2FS_BLKSIZE) {
 434                 f2fs_msg(sb, KERN_INFO,
 435                         "Invalid blocksize (%u), supports only 4KB\n",
 436                         blocksize);
 437                 return 1;
 438         }
 439
 440         if (le32_to_cpu(raw_super->log_sectorsize) !=
 441                                         F2FS_LOG_SECTOR_SIZE) {
 442                 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize");
 443                 return 1;
 444         }
 445         if (le32_to_cpu(raw_super->log_sectors_per_block) !=
 446                                         F2FS_LOG_SECTORS_PER_BLOCK) {
 447                 f2fs_msg(sb, KERN_INFO, "Invalid log sectors per block");
 448                 return 1;
 449         }
 450         return 0;
 451 }
 452
 453 static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
 454 {
 455         unsigned int total, fsmeta;
 456         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
 457         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 458
 459         total = le32_to_cpu(raw_super->segment_count);
 460         fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
 461         fsmeta += le32_to_cpu(raw_super->segment_count_sit);
 462         fsmeta += le32_to_cpu(raw_super->segment_count_nat);
 463         fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
 464         fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
 465
 466         if (fsmeta >= total)
 467                 return 1;
 468
 469         if (is_set_ckpt_flags(ckpt, CP_ERROR_FLAG)) {
 470                 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
 471                 return 1;
 472         }
 473         return 0;
 474 }
 475
 476 static void init_sb_info(struct f2fs_sb_info *sbi)
 477 {
 478         struct f2fs_super_block *raw_super = sbi->raw_super;
 479         int i;
 480
 481         sbi->log_sectors_per_block =
 482                 le32_to_cpu(raw_super->log_sectors_per_block);
 483         sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
 484         sbi->blocksize = 1 << sbi->log_blocksize;
 485         sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
 486         sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
 487         sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
 488         sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
 489         sbi->total_sections = le32_to_cpu(raw_super->section_count);
 490         sbi->total_node_count =
 491                 (le32_to_cpu(raw_super->segment_count_nat) / 2)
 492                         * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
 493         sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
 494         sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
 495         sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
 496         sbi->cur_victim_sec = NULL_SECNO;
 497
 498         for (i = 0; i < NR_COUNT_TYPE; i++)
 499                 atomic_set(&sbi->nr_pages[i], 0);
 500 }
 501
 502 static int validate_superblock(struct super_block *sb,
 503                 struct f2fs_super_block **raw_super,
 504                 struct buffer_head **raw_super_buf, sector_t block)
 505 {
 506         const char *super = (block == 0 ? "first" : "second");
 507
 508         /* read f2fs raw super block */
 509         *raw_super_buf = sb_bread(sb, block);
 510         if (!*raw_super_buf) {
 511                 f2fs_msg(sb, KERN_ERR, "unable to read %s superblock",
 512                                 super);
 513                 return -EIO;
 514         }
 515
 516         *raw_super = (struct f2fs_super_block *)
 517                 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
 518
 519         /* sanity checking of raw super */
 520         if (!sanity_check_raw_super(sb, *raw_super))
 521                 return 0;
 522
 523         f2fs_msg(sb, KERN_ERR, "Can't find a valid F2FS filesystem "
 524                                 "in %s superblock", super);
 525         return -EINVAL;
 526 }
 527
 528 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 529 {
 530         struct f2fs_sb_info *sbi;
 531         struct f2fs_super_block *raw_super;
 532         struct buffer_head *raw_super_buf;
 533         struct inode *root;
 534         long err = -EINVAL;
 535         int i;
 536
 537         /* allocate memory for f2fs-specific super block info */
 538         sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
 539         if (!sbi)
 540                 return -ENOMEM;
 541
 542         /* set a block size */
 543         if (!sb_set_blocksize(sb, F2FS_BLKSIZE)) {
 544                 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
 545                 goto free_sbi;
 546         }
 547
 548         err = validate_superblock(sb, &raw_super, &raw_super_buf, 0);
 549         if (err) {
 550                 brelse(raw_super_buf);
 551                 /* check secondary superblock when primary failed */
 552                 err = validate_superblock(sb, &raw_super, &raw_super_buf, 1);
 553                 if (err)
 554                         goto free_sb_buf;
 555         }
 556         sb->s_fs_info = sbi;
 557         /* init some FS parameters */
 558         sbi->active_logs = NR_CURSEG_TYPE;
 559
 560         set_opt(sbi, BG_GC);
 561
 562 #ifdef CONFIG_F2FS_FS_XATTR
 563         set_opt(sbi, XATTR_USER);
 564 #endif
 565 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 566         set_opt(sbi, POSIX_ACL);
 567 #endif
 568         /* parse mount options */
 569         err = parse_options(sb, (char *)data);
 570         if (err)
 571                 goto free_sb_buf;
 572
 573         sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
 574         sb->s_max_links = F2FS_LINK_MAX;
 575         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
 576
 577         sb->s_op = &f2fs_sops;
 578         sb->s_xattr = f2fs_xattr_handlers;
 579         sb->s_export_op = &f2fs_export_ops;
 580         sb->s_magic = F2FS_SUPER_MAGIC;
 581         sb->s_time_gran = 1;
 582         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 583                 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
 584         memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
 585
 586         /* init f2fs-specific super block info */
 587         sbi->sb = sb;
 588         sbi->raw_super = raw_super;
 589         sbi->raw_super_buf = raw_super_buf;
 590         mutex_init(&sbi->gc_mutex);
 591         mutex_init(&sbi->writepages);
 592         mutex_init(&sbi->cp_mutex);
 593         for (i = 0; i < NR_GLOBAL_LOCKS; i++)
 594                 mutex_init(&sbi->fs_lock[i]);
 595         mutex_init(&sbi->node_write);
 596         sbi->por_doing = 0;
 597         spin_lock_init(&sbi->stat_lock);
 598         init_rwsem(&sbi->bio_sem);
 599         init_sb_info(sbi);
 600
 601         /* get an inode for meta space */
 602         sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
 603         if (IS_ERR(sbi->meta_inode)) {
 604                 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
 605                 err = PTR_ERR(sbi->meta_inode);
 606                 goto free_sb_buf;
 607         }
 608
 609         err = get_valid_checkpoint(sbi);
 610         if (err) {
 611                 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
 612                 goto free_meta_inode;
 613         }
 614
 615         /* sanity checking of checkpoint */
 616         err = -EINVAL;
 617         if (sanity_check_ckpt(sbi)) {
 618                 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
 619                 goto free_cp;
 620         }
 621
 622         sbi->total_valid_node_count =
 623                                 le32_to_cpu(sbi->ckpt->valid_node_count);
 624         sbi->total_valid_inode_count =
 625                                 le32_to_cpu(sbi->ckpt->valid_inode_count);
 626         sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
 627         sbi->total_valid_block_count =
 628                                 le64_to_cpu(sbi->ckpt->valid_block_count);
 629         sbi->last_valid_block_count = sbi->total_valid_block_count;
 630         sbi->alloc_valid_block_count = 0;
 631         INIT_LIST_HEAD(&sbi->dir_inode_list);
 632         spin_lock_init(&sbi->dir_inode_lock);
 633
 634         init_orphan_info(sbi);
 635
 636         /* setup f2fs internal modules */
 637         err = build_segment_manager(sbi);
 638         if (err) {
 639                 f2fs_msg(sb, KERN_ERR,
 640                         "Failed to initialize F2FS segment manager");
 641                 goto free_sm;
 642         }
 643         err = build_node_manager(sbi);
 644         if (err) {
 645                 f2fs_msg(sb, KERN_ERR,
 646                         "Failed to initialize F2FS node manager");
 647                 goto free_nm;
 648         }
 649
 650         build_gc_manager(sbi);
 651
 652         /* get an inode for node space */
 653         sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
 654         if (IS_ERR(sbi->node_inode)) {
 655                 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
 656                 err = PTR_ERR(sbi->node_inode);
 657                 goto free_nm;
 658         }
 659
 660         /* if there are nt orphan nodes free them */
 661         err = -EINVAL;
 662         if (recover_orphan_inodes(sbi))
 663                 goto free_node_inode;
 664
 665         /* read root inode and dentry */
 666         root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
 667         if (IS_ERR(root)) {
 668                 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
 669                 err = PTR_ERR(root);
 670                 goto free_node_inode;
 671         }
 672         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size)
 673                 goto free_root_inode;
 674
 675         sb->s_root = d_make_root(root); /* allocate root dentry */
 676         if (!sb->s_root) {
 677                 err = -ENOMEM;
 678                 goto free_root_inode;
 679         }
 680
 681         /* recover fsynced data */
 682         if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
 683                 err = recover_fsync_data(sbi);
 684                 if (err)
 685                         f2fs_msg(sb, KERN_ERR,
 686                                 "Cannot recover all fsync data errno=%ld", err);
 687         }
 688
 689         /* After POR, we can run background GC thread */
 690         err = start_gc_thread(sbi);
 691         if (err)
 692                 goto fail;
 693
 694         err = f2fs_build_stats(sbi);
 695         if (err)
 696                 goto fail;
 697
 698         if (test_opt(sbi, DISCARD)) {
 699                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
 700                 if (!blk_queue_discard(q))
 701                         f2fs_msg(sb, KERN_WARNING,
 702                                         "mounting with \"discard\" option, but "
 703                                         "the device does not support discard");
 704         }
 705
 706         return 0;
 707 fail:
 708         stop_gc_thread(sbi);
 709 free_root_inode:
 710         dput(sb->s_root);
 711         sb->s_root = NULL;
 712 free_node_inode:
 713         iput(sbi->node_inode);
 714 free_nm:
 715         destroy_node_manager(sbi);
 716 free_sm:
 717         destroy_segment_manager(sbi);
 718 free_cp:
 719         kfree(sbi->ckpt);
 720 free_meta_inode:
 721         make_bad_inode(sbi->meta_inode);
 722         iput(sbi->meta_inode);
 723 free_sb_buf:
 724         brelse(raw_super_buf);
 725 free_sbi:
 726         kfree(sbi);
 727         return err;
 728 }
 729
 730 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
 731                         const char *dev_name, void *data)
 732 {
 733         return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
 734 }
 735
 736 static struct file_system_type f2fs_fs_type = {
 737         .owner          = THIS_MODULE,
 738         .name           = "f2fs",
 739         .mount          = f2fs_mount,
 740         .kill_sb        = kill_block_super,
 741         .fs_flags       = FS_REQUIRES_DEV,
 742 };
 743 MODULE_ALIAS_FS("f2fs");
 744
 745 static int __init init_inodecache(void)
 746 {
 747         f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
 748                         sizeof(struct f2fs_inode_info), NULL);
 749         if (f2fs_inode_cachep == NULL)
 750                 return -ENOMEM;
 751         return 0;
 752 }
 753
 754 static void destroy_inodecache(void)
 755 {
 756         /*
 757          * Make sure all delayed rcu free inodes are flushed before we
 758          * destroy cache.
 759          */
 760         rcu_barrier();
 761         kmem_cache_destroy(f2fs_inode_cachep);
 762 }
 763
 764 static int __init init_f2fs_fs(void)
 765 {
 766         int err;
 767
 768         err = init_inodecache();
 769         if (err)
 770                 goto fail;
 771         err = create_node_manager_caches();
 772         if (err)
 773                 goto fail;
 774         err = create_gc_caches();
 775         if (err)
 776                 goto fail;
 777         err = create_checkpoint_caches();
 778         if (err)
 779                 goto fail;
 780         err = register_filesystem(&f2fs_fs_type);
 781         if (err)
 782                 goto fail;
 783         f2fs_create_root_stats();
 784 fail:
 785         return err;
 786 }
 787
 788 static void __exit exit_f2fs_fs(void)
 789 {
 790         f2fs_destroy_root_stats();
 791         unregister_filesystem(&f2fs_fs_type);
 792         destroy_checkpoint_caches();
 793         destroy_gc_caches();
 794         destroy_node_manager_caches();
 795         destroy_inodecache();
 796 }
 797
 798 module_init(init_f2fs_fs)
 799 module_exit(exit_f2fs_fs)
 800
 801 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
 802 MODULE_DESCRIPTION("Flash Friendly File System");
 803 MODULE_LICENSE("GPL");