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