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