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