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/proc_fs.h>
  22 #include <linux/random.h>
  23 #include <linux/exportfs.h>
  24 #include <linux/blkdev.h>
  25 #include <linux/f2fs_fs.h>
  26 #include <linux/sysfs.h>
  27
  28 #include "f2fs.h"
  29 #include "node.h"
  30 #include "segment.h"
  31 #include "xattr.h"
  32 #include "gc.h"
  33 #include "trace.h"
  34
  35 #define CREATE_TRACE_POINTS
  36 #include <trace/events/f2fs.h>
  37
  38 static struct proc_dir_entry *f2fs_proc_root;
  39 static struct kmem_cache *f2fs_inode_cachep;
  40 static struct kset *f2fs_kset;
  41
  42 enum {
  43         Opt_gc_background,
  44         Opt_disable_roll_forward,
  45         Opt_norecovery,
  46         Opt_discard,
  47         Opt_noheap,
  48         Opt_user_xattr,
  49         Opt_nouser_xattr,
  50         Opt_acl,
  51         Opt_noacl,
  52         Opt_active_logs,
  53         Opt_disable_ext_identify,
  54         Opt_inline_xattr,
  55         Opt_inline_data,
  56         Opt_inline_dentry,
  57         Opt_flush_merge,
  58         Opt_nobarrier,
  59         Opt_fastboot,
  60         Opt_err,
  61 };
  62
  63 static match_table_t f2fs_tokens = {
  64         {Opt_gc_background, "background_gc=%s"},
  65         {Opt_disable_roll_forward, "disable_roll_forward"},
  66         {Opt_norecovery, "norecovery"},
  67         {Opt_discard, "discard"},
  68         {Opt_noheap, "no_heap"},
  69         {Opt_user_xattr, "user_xattr"},
  70         {Opt_nouser_xattr, "nouser_xattr"},
  71         {Opt_acl, "acl"},
  72         {Opt_noacl, "noacl"},
  73         {Opt_active_logs, "active_logs=%u"},
  74         {Opt_disable_ext_identify, "disable_ext_identify"},
  75         {Opt_inline_xattr, "inline_xattr"},
  76         {Opt_inline_data, "inline_data"},
  77         {Opt_inline_dentry, "inline_dentry"},
  78         {Opt_flush_merge, "flush_merge"},
  79         {Opt_nobarrier, "nobarrier"},
  80         {Opt_fastboot, "fastboot"},
  81         {Opt_err, NULL},
  82 };
  83
  84 /* Sysfs support for f2fs */
  85 enum {
  86         GC_THREAD,      /* struct f2fs_gc_thread */
  87         SM_INFO,        /* struct f2fs_sm_info */
  88         NM_INFO,        /* struct f2fs_nm_info */
  89         F2FS_SBI,       /* struct f2fs_sb_info */
  90 };
  91
  92 struct f2fs_attr {
  93         struct attribute attr;
  94         ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
  95         ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
  96                          const char *, size_t);
  97         int struct_type;
  98         int offset;
  99 };
 100
 101 static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
 102 {
 103         if (struct_type == GC_THREAD)
 104                 return (unsigned char *)sbi->gc_thread;
 105         else if (struct_type == SM_INFO)
 106                 return (unsigned char *)SM_I(sbi);
 107         else if (struct_type == NM_INFO)
 108                 return (unsigned char *)NM_I(sbi);
 109         else if (struct_type == F2FS_SBI)
 110                 return (unsigned char *)sbi;
 111         return NULL;
 112 }
 113
 114 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
 115                         struct f2fs_sb_info *sbi, char *buf)
 116 {
 117         unsigned char *ptr = NULL;
 118         unsigned int *ui;
 119
 120         ptr = __struct_ptr(sbi, a->struct_type);
 121         if (!ptr)
 122                 return -EINVAL;
 123
 124         ui = (unsigned int *)(ptr + a->offset);
 125
 126         return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
 127 }
 128
 129 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
 130                         struct f2fs_sb_info *sbi,
 131                         const char *buf, size_t count)
 132 {
 133         unsigned char *ptr;
 134         unsigned long t;
 135         unsigned int *ui;
 136         ssize_t ret;
 137
 138         ptr = __struct_ptr(sbi, a->struct_type);
 139         if (!ptr)
 140                 return -EINVAL;
 141
 142         ui = (unsigned int *)(ptr + a->offset);
 143
 144         ret = kstrtoul(skip_spaces(buf), 0, &t);
 145         if (ret < 0)
 146                 return ret;
 147         *ui = t;
 148         return count;
 149 }
 150
 151 static ssize_t f2fs_attr_show(struct kobject *kobj,
 152                                 struct attribute *attr, char *buf)
 153 {
 154         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 155                                                                 s_kobj);
 156         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 157
 158         return a->show ? a->show(a, sbi, buf) : 0;
 159 }
 160
 161 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
 162                                                 const char *buf, size_t len)
 163 {
 164         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 165                                                                         s_kobj);
 166         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 167
 168         return a->store ? a->store(a, sbi, buf, len) : 0;
 169 }
 170
 171 static void f2fs_sb_release(struct kobject *kobj)
 172 {
 173         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 174                                                                 s_kobj);
 175         complete(&sbi->s_kobj_unregister);
 176 }
 177
 178 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
 179 static struct f2fs_attr f2fs_attr_##_name = {                   \
 180         .attr = {.name = __stringify(_name), .mode = _mode },   \
 181         .show   = _show,                                        \
 182         .store  = _store,                                       \
 183         .struct_type = _struct_type,                            \
 184         .offset = _offset                                       \
 185 }
 186
 187 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname)    \
 188         F2FS_ATTR_OFFSET(struct_type, name, 0644,               \
 189                 f2fs_sbi_show, f2fs_sbi_store,                  \
 190                 offsetof(struct struct_name, elname))
 191
 192 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
 193 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
 194 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
 195 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
 196 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
 197 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
 198 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
 199 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
 200 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
 201 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
 202 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
 203 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
 204
 205 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
 206 static struct attribute *f2fs_attrs[] = {
 207         ATTR_LIST(gc_min_sleep_time),
 208         ATTR_LIST(gc_max_sleep_time),
 209         ATTR_LIST(gc_no_gc_sleep_time),
 210         ATTR_LIST(gc_idle),
 211         ATTR_LIST(reclaim_segments),
 212         ATTR_LIST(max_small_discards),
 213         ATTR_LIST(ipu_policy),
 214         ATTR_LIST(min_ipu_util),
 215         ATTR_LIST(min_fsync_blocks),
 216         ATTR_LIST(max_victim_search),
 217         ATTR_LIST(dir_level),
 218         ATTR_LIST(ram_thresh),
 219         NULL,
 220 };
 221
 222 static const struct sysfs_ops f2fs_attr_ops = {
 223         .show   = f2fs_attr_show,
 224         .store  = f2fs_attr_store,
 225 };
 226
 227 static struct kobj_type f2fs_ktype = {
 228         .default_attrs  = f2fs_attrs,
 229         .sysfs_ops      = &f2fs_attr_ops,
 230         .release        = f2fs_sb_release,
 231 };
 232
 233 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
 234 {
 235         struct va_format vaf;
 236         va_list args;
 237
 238         va_start(args, fmt);
 239         vaf.fmt = fmt;
 240         vaf.va = &args;
 241         printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
 242         va_end(args);
 243 }
 244
 245 static void init_once(void *foo)
 246 {
 247         struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
 248
 249         inode_init_once(&fi->vfs_inode);
 250 }
 251
 252 static int parse_options(struct super_block *sb, char *options)
 253 {
 254         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 255         substring_t args[MAX_OPT_ARGS];
 256         char *p, *name;
 257         int arg = 0;
 258
 259         if (!options)
 260                 return 0;
 261
 262         while ((p = strsep(&options, ",")) != NULL) {
 263                 int token;
 264                 if (!*p)
 265                         continue;
 266                 /*
 267                  * Initialize args struct so we know whether arg was
 268                  * found; some options take optional arguments.
 269                  */
 270                 args[0].to = args[0].from = NULL;
 271                 token = match_token(p, f2fs_tokens, args);
 272
 273                 switch (token) {
 274                 case Opt_gc_background:
 275                         name = match_strdup(&args[0]);
 276
 277                         if (!name)
 278                                 return -ENOMEM;
 279                         if (strlen(name) == 2 && !strncmp(name, "on", 2))
 280                                 set_opt(sbi, BG_GC);
 281                         else if (strlen(name) == 3 && !strncmp(name, "off", 3))
 282                                 clear_opt(sbi, BG_GC);
 283                         else {
 284                                 kfree(name);
 285                                 return -EINVAL;
 286                         }
 287                         kfree(name);
 288                         break;
 289                 case Opt_disable_roll_forward:
 290                         set_opt(sbi, DISABLE_ROLL_FORWARD);
 291                         break;
 292                 case Opt_norecovery:
 293                         /* this option mounts f2fs with ro */
 294                         set_opt(sbi, DISABLE_ROLL_FORWARD);
 295                         if (!f2fs_readonly(sb))
 296                                 return -EINVAL;
 297                         break;
 298                 case Opt_discard:
 299                         set_opt(sbi, DISCARD);
 300                         break;
 301                 case Opt_noheap:
 302                         set_opt(sbi, NOHEAP);
 303                         break;
 304 #ifdef CONFIG_F2FS_FS_XATTR
 305                 case Opt_user_xattr:
 306                         set_opt(sbi, XATTR_USER);
 307                         break;
 308                 case Opt_nouser_xattr:
 309                         clear_opt(sbi, XATTR_USER);
 310                         break;
 311                 case Opt_inline_xattr:
 312                         set_opt(sbi, INLINE_XATTR);
 313                         break;
 314 #else
 315                 case Opt_user_xattr:
 316                         f2fs_msg(sb, KERN_INFO,
 317                                 "user_xattr options not supported");
 318                         break;
 319                 case Opt_nouser_xattr:
 320                         f2fs_msg(sb, KERN_INFO,
 321                                 "nouser_xattr options not supported");
 322                         break;
 323                 case Opt_inline_xattr:
 324                         f2fs_msg(sb, KERN_INFO,
 325                                 "inline_xattr options not supported");
 326                         break;
 327 #endif
 328 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 329                 case Opt_acl:
 330                         set_opt(sbi, POSIX_ACL);
 331                         break;
 332                 case Opt_noacl:
 333                         clear_opt(sbi, POSIX_ACL);
 334                         break;
 335 #else
 336                 case Opt_acl:
 337                         f2fs_msg(sb, KERN_INFO, "acl options not supported");
 338                         break;
 339                 case Opt_noacl:
 340                         f2fs_msg(sb, KERN_INFO, "noacl options not supported");
 341                         break;
 342 #endif
 343                 case Opt_active_logs:
 344                         if (args->from && match_int(args, &arg))
 345                                 return -EINVAL;
 346                         if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
 347                                 return -EINVAL;
 348                         sbi->active_logs = arg;
 349                         break;
 350                 case Opt_disable_ext_identify:
 351                         set_opt(sbi, DISABLE_EXT_IDENTIFY);
 352                         break;
 353                 case Opt_inline_data:
 354                         set_opt(sbi, INLINE_DATA);
 355                         break;
 356                 case Opt_inline_dentry:
 357                         set_opt(sbi, INLINE_DENTRY);
 358                         break;
 359                 case Opt_flush_merge:
 360                         set_opt(sbi, FLUSH_MERGE);
 361                         break;
 362                 case Opt_nobarrier:
 363                         set_opt(sbi, NOBARRIER);
 364                         break;
 365                 case Opt_fastboot:
 366                         set_opt(sbi, FASTBOOT);
 367                         break;
 368                 default:
 369                         f2fs_msg(sb, KERN_ERR,
 370                                 "Unrecognized mount option \"%s\" or missing value",
 371                                 p);
 372                         return -EINVAL;
 373                 }
 374         }
 375         return 0;
 376 }
 377
 378 static struct inode *f2fs_alloc_inode(struct super_block *sb)
 379 {
 380         struct f2fs_inode_info *fi;
 381
 382         fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
 383         if (!fi)
 384                 return NULL;
 385
 386         init_once((void *) fi);
 387
 388         /* Initialize f2fs-specific inode info */
 389         fi->vfs_inode.i_version = 1;
 390         atomic_set(&fi->dirty_pages, 0);
 391         fi->i_current_depth = 1;
 392         fi->i_advise = 0;
 393         rwlock_init(&fi->ext.ext_lock);
 394         init_rwsem(&fi->i_sem);
 395         INIT_RADIX_TREE(&fi->inmem_root, GFP_NOFS);
 396         INIT_LIST_HEAD(&fi->inmem_pages);
 397         mutex_init(&fi->inmem_lock);
 398
 399         set_inode_flag(fi, FI_NEW_INODE);
 400
 401         if (test_opt(F2FS_SB(sb), INLINE_XATTR))
 402                 set_inode_flag(fi, FI_INLINE_XATTR);
 403
 404         /* Will be used by directory only */
 405         fi->i_dir_level = F2FS_SB(sb)->dir_level;
 406
 407         return &fi->vfs_inode;
 408 }
 409
 410 static int f2fs_drop_inode(struct inode *inode)
 411 {
 412         /*
 413          * This is to avoid a deadlock condition like below.
 414          * writeback_single_inode(inode)
 415          *  - f2fs_write_data_page
 416          *    - f2fs_gc -> iput -> evict
 417          *       - inode_wait_for_writeback(inode)
 418          */
 419         if (!inode_unhashed(inode) && inode->i_state & I_SYNC)
 420                 return 0;
 421         return generic_drop_inode(inode);
 422 }
 423
 424 /*
 425  * f2fs_dirty_inode() is called from __mark_inode_dirty()
 426  *
 427  * We should call set_dirty_inode to write the dirty inode through write_inode.
 428  */
 429 static void f2fs_dirty_inode(struct inode *inode, int flags)
 430 {
 431         set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
 432 }
 433
 434 static void f2fs_i_callback(struct rcu_head *head)
 435 {
 436         struct inode *inode = container_of(head, struct inode, i_rcu);
 437         kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
 438 }
 439
 440 static void f2fs_destroy_inode(struct inode *inode)
 441 {
 442         call_rcu(&inode->i_rcu, f2fs_i_callback);
 443 }
 444
 445 static void f2fs_put_super(struct super_block *sb)
 446 {
 447         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 448
 449         if (sbi->s_proc) {
 450                 remove_proc_entry("segment_info", sbi->s_proc);
 451                 remove_proc_entry(sb->s_id, f2fs_proc_root);
 452         }
 453         kobject_del(&sbi->s_kobj);
 454
 455         f2fs_destroy_stats(sbi);
 456         stop_gc_thread(sbi);
 457
 458         /*
 459          * We don't need to do checkpoint when superblock is clean.
 460          * But, the previous checkpoint was not done by umount, it needs to do
 461          * clean checkpoint again.
 462          */
 463         if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
 464                         !is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) {
 465                 struct cp_control cpc = {
 466                         .reason = CP_UMOUNT,
 467                 };
 468                 write_checkpoint(sbi, &cpc);
 469         }
 470
 471         /*
 472          * normally superblock is clean, so we need to release this.
 473          * In addition, EIO will skip do checkpoint, we need this as well.
 474          */
 475         release_dirty_inode(sbi);
 476         release_discard_addrs(sbi);
 477
 478         iput(sbi->node_inode);
 479         iput(sbi->meta_inode);
 480
 481         /* destroy f2fs internal modules */
 482         destroy_node_manager(sbi);
 483         destroy_segment_manager(sbi);
 484
 485         kfree(sbi->ckpt);
 486         kobject_put(&sbi->s_kobj);
 487         wait_for_completion(&sbi->s_kobj_unregister);
 488
 489         sb->s_fs_info = NULL;
 490         brelse(sbi->raw_super_buf);
 491         kfree(sbi);
 492 }
 493
 494 int f2fs_sync_fs(struct super_block *sb, int sync)
 495 {
 496         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 497
 498         trace_f2fs_sync_fs(sb, sync);
 499
 500         if (sync) {
 501                 struct cp_control cpc;
 502
 503                 cpc.reason = __get_cp_reason(sbi);
 504
 505                 mutex_lock(&sbi->gc_mutex);
 506                 write_checkpoint(sbi, &cpc);
 507                 mutex_unlock(&sbi->gc_mutex);
 508         } else {
 509                 f2fs_balance_fs(sbi);
 510         }
 511         f2fs_trace_ios(NULL, NULL, 1);
 512
 513         return 0;
 514 }
 515
 516 static int f2fs_freeze(struct super_block *sb)
 517 {
 518         int err;
 519
 520         if (f2fs_readonly(sb))
 521                 return 0;
 522
 523         err = f2fs_sync_fs(sb, 1);
 524         return err;
 525 }
 526
 527 static int f2fs_unfreeze(struct super_block *sb)
 528 {
 529         return 0;
 530 }
 531
 532 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
 533 {
 534         struct super_block *sb = dentry->d_sb;
 535         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 536         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 537         block_t total_count, user_block_count, start_count, ovp_count;
 538
 539         total_count = le64_to_cpu(sbi->raw_super->block_count);
 540         user_block_count = sbi->user_block_count;
 541         start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
 542         ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
 543         buf->f_type = F2FS_SUPER_MAGIC;
 544         buf->f_bsize = sbi->blocksize;
 545
 546         buf->f_blocks = total_count - start_count;
 547         buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
 548         buf->f_bavail = user_block_count - valid_user_blocks(sbi);
 549
 550         buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
 551         buf->f_ffree = buf->f_files - valid_inode_count(sbi);
 552
 553         buf->f_namelen = F2FS_NAME_LEN;
 554         buf->f_fsid.val[0] = (u32)id;
 555         buf->f_fsid.val[1] = (u32)(id >> 32);
 556
 557         return 0;
 558 }
 559
 560 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
 561 {
 562         struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
 563
 564         if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC))
 565                 seq_printf(seq, ",background_gc=%s", "on");
 566         else
 567                 seq_printf(seq, ",background_gc=%s", "off");
 568         if (test_opt(sbi, DISABLE_ROLL_FORWARD))
 569                 seq_puts(seq, ",disable_roll_forward");
 570         if (test_opt(sbi, DISCARD))
 571                 seq_puts(seq, ",discard");
 572         if (test_opt(sbi, NOHEAP))
 573                 seq_puts(seq, ",no_heap_alloc");
 574 #ifdef CONFIG_F2FS_FS_XATTR
 575         if (test_opt(sbi, XATTR_USER))
 576                 seq_puts(seq, ",user_xattr");
 577         else
 578                 seq_puts(seq, ",nouser_xattr");
 579         if (test_opt(sbi, INLINE_XATTR))
 580                 seq_puts(seq, ",inline_xattr");
 581 #endif
 582 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 583         if (test_opt(sbi, POSIX_ACL))
 584                 seq_puts(seq, ",acl");
 585         else
 586                 seq_puts(seq, ",noacl");
 587 #endif
 588         if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
 589                 seq_puts(seq, ",disable_ext_identify");
 590         if (test_opt(sbi, INLINE_DATA))
 591                 seq_puts(seq, ",inline_data");
 592         if (test_opt(sbi, INLINE_DENTRY))
 593                 seq_puts(seq, ",inline_dentry");
 594         if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
 595                 seq_puts(seq, ",flush_merge");
 596         if (test_opt(sbi, NOBARRIER))
 597                 seq_puts(seq, ",nobarrier");
 598         if (test_opt(sbi, FASTBOOT))
 599                 seq_puts(seq, ",fastboot");
 600         seq_printf(seq, ",active_logs=%u", sbi->active_logs);
 601
 602         return 0;
 603 }
 604
 605 static int segment_info_seq_show(struct seq_file *seq, void *offset)
 606 {
 607         struct super_block *sb = seq->private;
 608         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 609         unsigned int total_segs =
 610                         le32_to_cpu(sbi->raw_super->segment_count_main);
 611         int i;
 612
 613         seq_puts(seq, "format: segment_type|valid_blocks\n"
 614                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
 615
 616         for (i = 0; i < total_segs; i++) {
 617                 struct seg_entry *se = get_seg_entry(sbi, i);
 618
 619                 if ((i % 10) == 0)
 620                         seq_printf(seq, "%-5d", i);
 621                 seq_printf(seq, "%d|%-3u", se->type,
 622                                         get_valid_blocks(sbi, i, 1));
 623                 if ((i % 10) == 9 || i == (total_segs - 1))
 624                         seq_putc(seq, '\n');
 625                 else
 626                         seq_putc(seq, ' ');
 627         }
 628
 629         return 0;
 630 }
 631
 632 static int segment_info_open_fs(struct inode *inode, struct file *file)
 633 {
 634         return single_open(file, segment_info_seq_show, PDE_DATA(inode));
 635 }
 636
 637 static const struct file_operations f2fs_seq_segment_info_fops = {
 638         .owner = THIS_MODULE,
 639         .open = segment_info_open_fs,
 640         .read = seq_read,
 641         .llseek = seq_lseek,
 642         .release = single_release,
 643 };
 644
 645 static int f2fs_remount(struct super_block *sb, int *flags, char *data)
 646 {
 647         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 648         struct f2fs_mount_info org_mount_opt;
 649         int err, active_logs;
 650         bool need_restart_gc = false;
 651         bool need_stop_gc = false;
 652
 653         sync_filesystem(sb);
 654
 655         /*
 656          * Save the old mount options in case we
 657          * need to restore them.
 658          */
 659         org_mount_opt = sbi->mount_opt;
 660         active_logs = sbi->active_logs;
 661
 662         sbi->mount_opt.opt = 0;
 663         sbi->active_logs = NR_CURSEG_TYPE;
 664
 665         /* parse mount options */
 666         err = parse_options(sb, data);
 667         if (err)
 668                 goto restore_opts;
 669
 670         /*
 671          * Previous and new state of filesystem is RO,
 672          * so skip checking GC and FLUSH_MERGE conditions.
 673          */
 674         if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
 675                 goto skip;
 676
 677         /*
 678          * We stop the GC thread if FS is mounted as RO
 679          * or if background_gc = off is passed in mount
 680          * option. Also sync the filesystem.
 681          */
 682         if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
 683                 if (sbi->gc_thread) {
 684                         stop_gc_thread(sbi);
 685                         f2fs_sync_fs(sb, 1);
 686                         need_restart_gc = true;
 687                 }
 688         } else if (!sbi->gc_thread) {
 689                 err = start_gc_thread(sbi);
 690                 if (err)
 691                         goto restore_opts;
 692                 need_stop_gc = true;
 693         }
 694
 695         /*
 696          * We stop issue flush thread if FS is mounted as RO
 697          * or if flush_merge is not passed in mount option.
 698          */
 699         if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
 700                 destroy_flush_cmd_control(sbi);
 701         } else if (!SM_I(sbi)->cmd_control_info) {
 702                 err = create_flush_cmd_control(sbi);
 703                 if (err)
 704                         goto restore_gc;
 705         }
 706 skip:
 707         /* Update the POSIXACL Flag */
 708          sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 709                 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
 710         return 0;
 711 restore_gc:
 712         if (need_restart_gc) {
 713                 if (start_gc_thread(sbi))
 714                         f2fs_msg(sbi->sb, KERN_WARNING,
 715                                 "background gc thread has stopped");
 716         } else if (need_stop_gc) {
 717                 stop_gc_thread(sbi);
 718         }
 719 restore_opts:
 720         sbi->mount_opt = org_mount_opt;
 721         sbi->active_logs = active_logs;
 722         return err;
 723 }
 724
 725 static struct super_operations f2fs_sops = {
 726         .alloc_inode    = f2fs_alloc_inode,
 727         .drop_inode     = f2fs_drop_inode,
 728         .destroy_inode  = f2fs_destroy_inode,
 729         .write_inode    = f2fs_write_inode,
 730         .dirty_inode    = f2fs_dirty_inode,
 731         .show_options   = f2fs_show_options,
 732         .evict_inode    = f2fs_evict_inode,
 733         .put_super      = f2fs_put_super,
 734         .sync_fs        = f2fs_sync_fs,
 735         .freeze_fs      = f2fs_freeze,
 736         .unfreeze_fs    = f2fs_unfreeze,
 737         .statfs         = f2fs_statfs,
 738         .remount_fs     = f2fs_remount,
 739 };
 740
 741 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
 742                 u64 ino, u32 generation)
 743 {
 744         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 745         struct inode *inode;
 746
 747         if (check_nid_range(sbi, ino))
 748                 return ERR_PTR(-ESTALE);
 749
 750         /*
 751          * f2fs_iget isn't quite right if the inode is currently unallocated!
 752          * However f2fs_iget currently does appropriate checks to handle stale
 753          * inodes so everything is OK.
 754          */
 755         inode = f2fs_iget(sb, ino);
 756         if (IS_ERR(inode))
 757                 return ERR_CAST(inode);
 758         if (unlikely(generation && inode->i_generation != generation)) {
 759                 /* we didn't find the right inode.. */
 760                 iput(inode);
 761                 return ERR_PTR(-ESTALE);
 762         }
 763         return inode;
 764 }
 765
 766 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
 767                 int fh_len, int fh_type)
 768 {
 769         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 770                                     f2fs_nfs_get_inode);
 771 }
 772
 773 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
 774                 int fh_len, int fh_type)
 775 {
 776         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 777                                     f2fs_nfs_get_inode);
 778 }
 779
 780 static const struct export_operations f2fs_export_ops = {
 781         .fh_to_dentry = f2fs_fh_to_dentry,
 782         .fh_to_parent = f2fs_fh_to_parent,
 783         .get_parent = f2fs_get_parent,
 784 };
 785
 786 static loff_t max_file_size(unsigned bits)
 787 {
 788         loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
 789         loff_t leaf_count = ADDRS_PER_BLOCK;
 790
 791         /* two direct node blocks */
 792         result += (leaf_count * 2);
 793
 794         /* two indirect node blocks */
 795         leaf_count *= NIDS_PER_BLOCK;
 796         result += (leaf_count * 2);
 797
 798         /* one double indirect node block */
 799         leaf_count *= NIDS_PER_BLOCK;
 800         result += leaf_count;
 801
 802         result <<= bits;
 803         return result;
 804 }
 805
 806 static int sanity_check_raw_super(struct super_block *sb,
 807                         struct f2fs_super_block *raw_super)
 808 {
 809         unsigned int blocksize;
 810
 811         if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
 812                 f2fs_msg(sb, KERN_INFO,
 813                         "Magic Mismatch, valid(0x%x) - read(0x%x)",
 814                         F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
 815                 return 1;
 816         }
 817
 818         /* Currently, support only 4KB page cache size */
 819         if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
 820                 f2fs_msg(sb, KERN_INFO,
 821                         "Invalid page_cache_size (%lu), supports only 4KB\n",
 822                         PAGE_CACHE_SIZE);
 823                 return 1;
 824         }
 825
 826         /* Currently, support only 4KB block size */
 827         blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
 828         if (blocksize != F2FS_BLKSIZE) {
 829                 f2fs_msg(sb, KERN_INFO,
 830                         "Invalid blocksize (%u), supports only 4KB\n",
 831                         blocksize);
 832                 return 1;
 833         }
 834
 835         /* Currently, support 512/1024/2048/4096 bytes sector size */
 836         if (le32_to_cpu(raw_super->log_sectorsize) >
 837                                 F2FS_MAX_LOG_SECTOR_SIZE ||
 838                 le32_to_cpu(raw_super->log_sectorsize) <
 839                                 F2FS_MIN_LOG_SECTOR_SIZE) {
 840                 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)",
 841                         le32_to_cpu(raw_super->log_sectorsize));
 842                 return 1;
 843         }
 844         if (le32_to_cpu(raw_super->log_sectors_per_block) +
 845                 le32_to_cpu(raw_super->log_sectorsize) !=
 846                         F2FS_MAX_LOG_SECTOR_SIZE) {
 847                 f2fs_msg(sb, KERN_INFO,
 848                         "Invalid log sectors per block(%u) log sectorsize(%u)",
 849                         le32_to_cpu(raw_super->log_sectors_per_block),
 850                         le32_to_cpu(raw_super->log_sectorsize));
 851                 return 1;
 852         }
 853         return 0;
 854 }
 855
 856 static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
 857 {
 858         unsigned int total, fsmeta;
 859         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
 860         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 861
 862         total = le32_to_cpu(raw_super->segment_count);
 863         fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
 864         fsmeta += le32_to_cpu(raw_super->segment_count_sit);
 865         fsmeta += le32_to_cpu(raw_super->segment_count_nat);
 866         fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
 867         fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
 868
 869         if (unlikely(fsmeta >= total))
 870                 return 1;
 871
 872         if (unlikely(f2fs_cp_error(sbi))) {
 873                 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
 874                 return 1;
 875         }
 876         return 0;
 877 }
 878
 879 static void init_sb_info(struct f2fs_sb_info *sbi)
 880 {
 881         struct f2fs_super_block *raw_super = sbi->raw_super;
 882         int i;
 883
 884         sbi->log_sectors_per_block =
 885                 le32_to_cpu(raw_super->log_sectors_per_block);
 886         sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
 887         sbi->blocksize = 1 << sbi->log_blocksize;
 888         sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
 889         sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
 890         sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
 891         sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
 892         sbi->total_sections = le32_to_cpu(raw_super->section_count);
 893         sbi->total_node_count =
 894                 (le32_to_cpu(raw_super->segment_count_nat) / 2)
 895                         * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
 896         sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
 897         sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
 898         sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
 899         sbi->cur_victim_sec = NULL_SECNO;
 900         sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
 901
 902         for (i = 0; i < NR_COUNT_TYPE; i++)
 903                 atomic_set(&sbi->nr_pages[i], 0);
 904
 905         sbi->dir_level = DEF_DIR_LEVEL;
 906         clear_sbi_flag(sbi, SBI_NEED_FSCK);
 907 }
 908
 909 /*
 910  * Read f2fs raw super block.
 911  * Because we have two copies of super block, so read the first one at first,
 912  * if the first one is invalid, move to read the second one.
 913  */
 914 static int read_raw_super_block(struct super_block *sb,
 915                         struct f2fs_super_block **raw_super,
 916                         struct buffer_head **raw_super_buf)
 917 {
 918         int block = 0;
 919
 920 retry:
 921         *raw_super_buf = sb_bread(sb, block);
 922         if (!*raw_super_buf) {
 923                 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
 924                                 block + 1);
 925                 if (block == 0) {
 926                         block++;
 927                         goto retry;
 928                 } else {
 929                         return -EIO;
 930                 }
 931         }
 932
 933         *raw_super = (struct f2fs_super_block *)
 934                 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
 935
 936         /* sanity checking of raw super */
 937         if (sanity_check_raw_super(sb, *raw_super)) {
 938                 brelse(*raw_super_buf);
 939                 f2fs_msg(sb, KERN_ERR,
 940                         "Can't find valid F2FS filesystem in %dth superblock",
 941                                                                 block + 1);
 942                 if (block == 0) {
 943                         block++;
 944                         goto retry;
 945                 } else {
 946                         return -EINVAL;
 947                 }
 948         }
 949
 950         return 0;
 951 }
 952
 953 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 954 {
 955         struct f2fs_sb_info *sbi;
 956         struct f2fs_super_block *raw_super = NULL;
 957         struct buffer_head *raw_super_buf;
 958         struct inode *root;
 959         long err = -EINVAL;
 960         bool retry = true;
 961         char *options = NULL;
 962         int i;
 963
 964 try_onemore:
 965         /* allocate memory for f2fs-specific super block info */
 966         sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
 967         if (!sbi)
 968                 return -ENOMEM;
 969
 970         /* set a block size */
 971         if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
 972                 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
 973                 goto free_sbi;
 974         }
 975
 976         err = read_raw_super_block(sb, &raw_super, &raw_super_buf);
 977         if (err)
 978                 goto free_sbi;
 979
 980         sb->s_fs_info = sbi;
 981         /* init some FS parameters */
 982         sbi->active_logs = NR_CURSEG_TYPE;
 983
 984         set_opt(sbi, BG_GC);
 985
 986 #ifdef CONFIG_F2FS_FS_XATTR
 987         set_opt(sbi, XATTR_USER);
 988 #endif
 989 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 990         set_opt(sbi, POSIX_ACL);
 991 #endif
 992         /* parse mount options */
 993         options = kstrdup((const char *)data, GFP_KERNEL);
 994         if (data && !options) {
 995                 err = -ENOMEM;
 996                 goto free_sb_buf;
 997         }
 998
 999         err = parse_options(sb, options);
1000         if (err)
1001                 goto free_options;
1002
1003         sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
1004         sb->s_max_links = F2FS_LINK_MAX;
1005         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1006
1007         sb->s_op = &f2fs_sops;
1008         sb->s_xattr = f2fs_xattr_handlers;
1009         sb->s_export_op = &f2fs_export_ops;
1010         sb->s_magic = F2FS_SUPER_MAGIC;
1011         sb->s_time_gran = 1;
1012         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1013                 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
1014         memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
1015
1016         /* init f2fs-specific super block info */
1017         sbi->sb = sb;
1018         sbi->raw_super = raw_super;
1019         sbi->raw_super_buf = raw_super_buf;
1020         mutex_init(&sbi->gc_mutex);
1021         mutex_init(&sbi->writepages);
1022         mutex_init(&sbi->cp_mutex);
1023         init_rwsem(&sbi->node_write);
1024         clear_sbi_flag(sbi, SBI_POR_DOING);
1025         spin_lock_init(&sbi->stat_lock);
1026
1027         init_rwsem(&sbi->read_io.io_rwsem);
1028         sbi->read_io.sbi = sbi;
1029         sbi->read_io.bio = NULL;
1030         for (i = 0; i < NR_PAGE_TYPE; i++) {
1031                 init_rwsem(&sbi->write_io[i].io_rwsem);
1032                 sbi->write_io[i].sbi = sbi;
1033                 sbi->write_io[i].bio = NULL;
1034         }
1035
1036         init_rwsem(&sbi->cp_rwsem);
1037         init_waitqueue_head(&sbi->cp_wait);
1038         init_sb_info(sbi);
1039
1040         /* get an inode for meta space */
1041         sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
1042         if (IS_ERR(sbi->meta_inode)) {
1043                 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
1044                 err = PTR_ERR(sbi->meta_inode);
1045                 goto free_options;
1046         }
1047
1048         err = get_valid_checkpoint(sbi);
1049         if (err) {
1050                 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
1051                 goto free_meta_inode;
1052         }
1053
1054         /* sanity checking of checkpoint */
1055         err = -EINVAL;
1056         if (sanity_check_ckpt(sbi)) {
1057                 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
1058                 goto free_cp;
1059         }
1060
1061         sbi->total_valid_node_count =
1062                                 le32_to_cpu(sbi->ckpt->valid_node_count);
1063         sbi->total_valid_inode_count =
1064                                 le32_to_cpu(sbi->ckpt->valid_inode_count);
1065         sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
1066         sbi->total_valid_block_count =
1067                                 le64_to_cpu(sbi->ckpt->valid_block_count);
1068         sbi->last_valid_block_count = sbi->total_valid_block_count;
1069         sbi->alloc_valid_block_count = 0;
1070         INIT_LIST_HEAD(&sbi->dir_inode_list);
1071         spin_lock_init(&sbi->dir_inode_lock);
1072
1073         init_ino_entry_info(sbi);
1074
1075         /* setup f2fs internal modules */
1076         err = build_segment_manager(sbi);
1077         if (err) {
1078                 f2fs_msg(sb, KERN_ERR,
1079                         "Failed to initialize F2FS segment manager");
1080                 goto free_sm;
1081         }
1082         err = build_node_manager(sbi);
1083         if (err) {
1084                 f2fs_msg(sb, KERN_ERR,
1085                         "Failed to initialize F2FS node manager");
1086                 goto free_nm;
1087         }
1088
1089         build_gc_manager(sbi);
1090
1091         /* get an inode for node space */
1092         sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
1093         if (IS_ERR(sbi->node_inode)) {
1094                 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
1095                 err = PTR_ERR(sbi->node_inode);
1096                 goto free_nm;
1097         }
1098
1099         /* if there are nt orphan nodes free them */
1100         recover_orphan_inodes(sbi);
1101
1102         /* read root inode and dentry */
1103         root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
1104         if (IS_ERR(root)) {
1105                 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
1106                 err = PTR_ERR(root);
1107                 goto free_node_inode;
1108         }
1109         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1110                 iput(root);
1111                 err = -EINVAL;
1112                 goto free_node_inode;
1113         }
1114
1115         sb->s_root = d_make_root(root); /* allocate root dentry */
1116         if (!sb->s_root) {
1117                 err = -ENOMEM;
1118                 goto free_root_inode;
1119         }
1120
1121         err = f2fs_build_stats(sbi);
1122         if (err)
1123                 goto free_root_inode;
1124
1125         if (f2fs_proc_root)
1126                 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
1127
1128         if (sbi->s_proc)
1129                 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
1130                                  &f2fs_seq_segment_info_fops, sb);
1131
1132         if (test_opt(sbi, DISCARD)) {
1133                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1134                 if (!blk_queue_discard(q))
1135                         f2fs_msg(sb, KERN_WARNING,
1136                                         "mounting with \"discard\" option, but "
1137                                         "the device does not support discard");
1138         }
1139
1140         sbi->s_kobj.kset = f2fs_kset;
1141         init_completion(&sbi->s_kobj_unregister);
1142         err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1143                                                         "%s", sb->s_id);
1144         if (err)
1145                 goto free_proc;
1146
1147         if (!retry)
1148                 set_sbi_flag(sbi, SBI_NEED_FSCK);
1149
1150         /* recover fsynced data */
1151         if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1152                 err = recover_fsync_data(sbi);
1153                 if (err) {
1154                         f2fs_msg(sb, KERN_ERR,
1155                                 "Cannot recover all fsync data errno=%ld", err);
1156                         goto free_kobj;
1157                 }
1158         }
1159
1160         /*
1161          * If filesystem is not mounted as read-only then
1162          * do start the gc_thread.
1163          */
1164         if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) {
1165                 /* After POR, we can run background GC thread.*/
1166                 err = start_gc_thread(sbi);
1167                 if (err)
1168                         goto free_kobj;
1169         }
1170         kfree(options);
1171         return 0;
1172
1173 free_kobj:
1174         kobject_del(&sbi->s_kobj);
1175 free_proc:
1176         if (sbi->s_proc) {
1177                 remove_proc_entry("segment_info", sbi->s_proc);
1178                 remove_proc_entry(sb->s_id, f2fs_proc_root);
1179         }
1180         f2fs_destroy_stats(sbi);
1181 free_root_inode:
1182         dput(sb->s_root);
1183         sb->s_root = NULL;
1184 free_node_inode:
1185         iput(sbi->node_inode);
1186 free_nm:
1187         destroy_node_manager(sbi);
1188 free_sm:
1189         destroy_segment_manager(sbi);
1190 free_cp:
1191         kfree(sbi->ckpt);
1192 free_meta_inode:
1193         make_bad_inode(sbi->meta_inode);
1194         iput(sbi->meta_inode);
1195 free_options:
1196         kfree(options);
1197 free_sb_buf:
1198         brelse(raw_super_buf);
1199 free_sbi:
1200         kfree(sbi);
1201
1202         /* give only one another chance */
1203         if (retry) {
1204                 retry = 0;
1205                 shrink_dcache_sb(sb);
1206                 goto try_onemore;
1207         }
1208         return err;
1209 }
1210
1211 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
1212                         const char *dev_name, void *data)
1213 {
1214         return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
1215 }
1216
1217 static void kill_f2fs_super(struct super_block *sb)
1218 {
1219         if (sb->s_root)
1220                 set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE);
1221         kill_block_super(sb);
1222 }
1223
1224 static struct file_system_type f2fs_fs_type = {
1225         .owner          = THIS_MODULE,
1226         .name           = "f2fs",
1227         .mount          = f2fs_mount,
1228         .kill_sb        = kill_f2fs_super,
1229         .fs_flags       = FS_REQUIRES_DEV,
1230 };
1231 MODULE_ALIAS_FS("f2fs");
1232
1233 static int __init init_inodecache(void)
1234 {
1235         f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
1236                         sizeof(struct f2fs_inode_info));
1237         if (!f2fs_inode_cachep)
1238                 return -ENOMEM;
1239         return 0;
1240 }
1241
1242 static void destroy_inodecache(void)
1243 {
1244         /*
1245          * Make sure all delayed rcu free inodes are flushed before we
1246          * destroy cache.
1247          */
1248         rcu_barrier();
1249         kmem_cache_destroy(f2fs_inode_cachep);
1250 }
1251
1252 static int __init init_f2fs_fs(void)
1253 {
1254         int err;
1255
1256         f2fs_build_trace_ios();
1257
1258         err = init_inodecache();
1259         if (err)
1260                 goto fail;
1261         err = create_node_manager_caches();
1262         if (err)
1263                 goto free_inodecache;
1264         err = create_segment_manager_caches();
1265         if (err)
1266                 goto free_node_manager_caches;
1267         err = create_checkpoint_caches();
1268         if (err)
1269                 goto free_segment_manager_caches;
1270         f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
1271         if (!f2fs_kset) {
1272                 err = -ENOMEM;
1273                 goto free_checkpoint_caches;
1274         }
1275         err = register_filesystem(&f2fs_fs_type);
1276         if (err)
1277                 goto free_kset;
1278         f2fs_create_root_stats();
1279         f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1280         return 0;
1281
1282 free_kset:
1283         kset_unregister(f2fs_kset);
1284 free_checkpoint_caches:
1285         destroy_checkpoint_caches();
1286 free_segment_manager_caches:
1287         destroy_segment_manager_caches();
1288 free_node_manager_caches:
1289         destroy_node_manager_caches();
1290 free_inodecache:
1291         destroy_inodecache();
1292 fail:
1293         return err;
1294 }
1295
1296 static void __exit exit_f2fs_fs(void)
1297 {
1298         remove_proc_entry("fs/f2fs", NULL);
1299         f2fs_destroy_root_stats();
1300         unregister_filesystem(&f2fs_fs_type);
1301         destroy_checkpoint_caches();
1302         destroy_segment_manager_caches();
1303         destroy_node_manager_caches();
1304         destroy_inodecache();
1305         kset_unregister(f2fs_kset);
1306         f2fs_destroy_trace_ios();
1307 }
1308
1309 module_init(init_f2fs_fs)
1310 module_exit(exit_f2fs_fs)
1311
1312 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1313 MODULE_DESCRIPTION("Flash Friendly File System");
1314 MODULE_LICENSE("GPL");