fs/f2fs/super.c

   1 /*
   2  * fs/f2fs/super.c
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *             http://www.samsung.com/
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/fs.h>
  14 #include <linux/statfs.h>
  15 #include <linux/buffer_head.h>
  16 #include <linux/backing-dev.h>
  17 #include <linux/kthread.h>
  18 #include <linux/parser.h>
  19 #include <linux/mount.h>
  20 #include <linux/seq_file.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/random.h>
  23 #include <linux/exportfs.h>
  24 #include <linux/blkdev.h>
  25 #include <linux/f2fs_fs.h>
  26 #include <linux/sysfs.h>
  27
  28 #include "f2fs.h"
  29 #include "node.h"
  30 #include "segment.h"
  31 #include "xattr.h"
  32 #include "gc.h"
  33 #include "trace.h"
  34
  35 #define CREATE_TRACE_POINTS
  36 #include <trace/events/f2fs.h>
  37
  38 static struct proc_dir_entry *f2fs_proc_root;
  39 static struct kmem_cache *f2fs_inode_cachep;
  40 static struct kset *f2fs_kset;
  41
  42 enum {
  43         Opt_gc_background,
  44         Opt_disable_roll_forward,
  45         Opt_discard,
  46         Opt_noheap,
  47         Opt_user_xattr,
  48         Opt_nouser_xattr,
  49         Opt_acl,
  50         Opt_noacl,
  51         Opt_active_logs,
  52         Opt_disable_ext_identify,
  53         Opt_inline_xattr,
  54         Opt_inline_data,
  55         Opt_inline_dentry,
  56         Opt_flush_merge,
  57         Opt_nobarrier,
  58         Opt_fastboot,
  59         Opt_err,
  60 };
  61
  62 static match_table_t f2fs_tokens = {
  63         {Opt_gc_background, "background_gc=%s"},
  64         {Opt_disable_roll_forward, "disable_roll_forward"},
  65         {Opt_discard, "discard"},
  66         {Opt_noheap, "no_heap"},
  67         {Opt_user_xattr, "user_xattr"},
  68         {Opt_nouser_xattr, "nouser_xattr"},
  69         {Opt_acl, "acl"},
  70         {Opt_noacl, "noacl"},
  71         {Opt_active_logs, "active_logs=%u"},
  72         {Opt_disable_ext_identify, "disable_ext_identify"},
  73         {Opt_inline_xattr, "inline_xattr"},
  74         {Opt_inline_data, "inline_data"},
  75         {Opt_inline_dentry, "inline_dentry"},
  76         {Opt_flush_merge, "flush_merge"},
  77         {Opt_nobarrier, "nobarrier"},
  78         {Opt_fastboot, "fastboot"},
  79         {Opt_err, NULL},
  80 };
  81
  82 /* Sysfs support for f2fs */
  83 enum {
  84         GC_THREAD,      /* struct f2fs_gc_thread */
  85         SM_INFO,        /* struct f2fs_sm_info */
  86         NM_INFO,        /* struct f2fs_nm_info */
  87         F2FS_SBI,       /* struct f2fs_sb_info */
  88 };
  89
  90 struct f2fs_attr {
  91         struct attribute attr;
  92         ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
  93         ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
  94                          const char *, size_t);
  95         int struct_type;
  96         int offset;
  97 };
  98
  99 static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
 100 {
 101         if (struct_type == GC_THREAD)
 102                 return (unsigned char *)sbi->gc_thread;
 103         else if (struct_type == SM_INFO)
 104                 return (unsigned char *)SM_I(sbi);
 105         else if (struct_type == NM_INFO)
 106                 return (unsigned char *)NM_I(sbi);
 107         else if (struct_type == F2FS_SBI)
 108                 return (unsigned char *)sbi;
 109         return NULL;
 110 }
 111
 112 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
 113                         struct f2fs_sb_info *sbi, char *buf)
 114 {
 115         unsigned char *ptr = NULL;
 116         unsigned int *ui;
 117
 118         ptr = __struct_ptr(sbi, a->struct_type);
 119         if (!ptr)
 120                 return -EINVAL;
 121
 122         ui = (unsigned int *)(ptr + a->offset);
 123
 124         return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
 125 }
 126
 127 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
 128                         struct f2fs_sb_info *sbi,
 129                         const char *buf, size_t count)
 130 {
 131         unsigned char *ptr;
 132         unsigned long t;
 133         unsigned int *ui;
 134         ssize_t ret;
 135
 136         ptr = __struct_ptr(sbi, a->struct_type);
 137         if (!ptr)
 138                 return -EINVAL;
 139
 140         ui = (unsigned int *)(ptr + a->offset);
 141
 142         ret = kstrtoul(skip_spaces(buf), 0, &t);
 143         if (ret < 0)
 144                 return ret;
 145         *ui = t;
 146         return count;
 147 }
 148
 149 static ssize_t f2fs_attr_show(struct kobject *kobj,
 150                                 struct attribute *attr, char *buf)
 151 {
 152         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 153                                                                 s_kobj);
 154         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 155
 156         return a->show ? a->show(a, sbi, buf) : 0;
 157 }
 158
 159 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
 160                                                 const char *buf, size_t len)
 161 {
 162         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 163                                                                         s_kobj);
 164         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 165
 166         return a->store ? a->store(a, sbi, buf, len) : 0;
 167 }
 168
 169 static void f2fs_sb_release(struct kobject *kobj)
 170 {
 171         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 172                                                                 s_kobj);
 173         complete(&sbi->s_kobj_unregister);
 174 }
 175
 176 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
 177 static struct f2fs_attr f2fs_attr_##_name = {                   \
 178         .attr = {.name = __stringify(_name), .mode = _mode },   \
 179         .show   = _show,                                        \
 180         .store  = _store,                                       \
 181         .struct_type = _struct_type,                            \
 182         .offset = _offset                                       \
 183 }
 184
 185 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname)    \
 186         F2FS_ATTR_OFFSET(struct_type, name, 0644,               \
 187                 f2fs_sbi_show, f2fs_sbi_store,                  \
 188                 offsetof(struct struct_name, elname))
 189
 190 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
 191 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
 192 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
 193 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
 194 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
 195 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
 196 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
 197 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
 198 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
 199 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
 200 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
 201 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
 202
 203 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
 204 static struct attribute *f2fs_attrs[] = {
 205         ATTR_LIST(gc_min_sleep_time),
 206         ATTR_LIST(gc_max_sleep_time),
 207         ATTR_LIST(gc_no_gc_sleep_time),
 208         ATTR_LIST(gc_idle),
 209         ATTR_LIST(reclaim_segments),
 210         ATTR_LIST(max_small_discards),
 211         ATTR_LIST(ipu_policy),
 212         ATTR_LIST(min_ipu_util),
 213         ATTR_LIST(min_fsync_blocks),
 214         ATTR_LIST(max_victim_search),
 215         ATTR_LIST(dir_level),
 216         ATTR_LIST(ram_thresh),
 217         NULL,
 218 };
 219
 220 static const struct sysfs_ops f2fs_attr_ops = {
 221         .show   = f2fs_attr_show,
 222         .store  = f2fs_attr_store,
 223 };
 224
 225 static struct kobj_type f2fs_ktype = {
 226         .default_attrs  = f2fs_attrs,
 227         .sysfs_ops      = &f2fs_attr_ops,
 228         .release        = f2fs_sb_release,
 229 };
 230
 231 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
 232 {
 233         struct va_format vaf;
 234         va_list args;
 235
 236         va_start(args, fmt);
 237         vaf.fmt = fmt;
 238         vaf.va = &args;
 239         printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
 240         va_end(args);
 241 }
 242
 243 static void init_once(void *foo)
 244 {
 245         struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
 246
 247         inode_init_once(&fi->vfs_inode);
 248 }
 249
 250 static int parse_options(struct super_block *sb, char *options)
 251 {
 252         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 253         substring_t args[MAX_OPT_ARGS];
 254         char *p, *name;
 255         int arg = 0;
 256
 257         if (!options)
 258                 return 0;
 259
 260         while ((p = strsep(&options, ",")) != NULL) {
 261                 int token;
 262                 if (!*p)
 263                         continue;
 264                 /*
 265                  * Initialize args struct so we know whether arg was
 266                  * found; some options take optional arguments.
 267                  */
 268                 args[0].to = args[0].from = NULL;
 269                 token = match_token(p, f2fs_tokens, args);
 270
 271                 switch (token) {
 272                 case Opt_gc_background:
 273                         name = match_strdup(&args[0]);
 274
 275                         if (!name)
 276                                 return -ENOMEM;
 277                         if (strlen(name) == 2 && !strncmp(name, "on", 2))
 278                                 set_opt(sbi, BG_GC);
 279                         else if (strlen(name) == 3 && !strncmp(name, "off", 3))
 280                                 clear_opt(sbi, BG_GC);
 281                         else {
 282                                 kfree(name);
 283                                 return -EINVAL;
 284                         }
 285                         kfree(name);
 286                         break;
 287                 case Opt_disable_roll_forward:
 288                         set_opt(sbi, DISABLE_ROLL_FORWARD);
 289                         break;
 290                 case Opt_discard:
 291                         set_opt(sbi, DISCARD);
 292                         break;
 293                 case Opt_noheap:
 294                         set_opt(sbi, NOHEAP);
 295                         break;
 296 #ifdef CONFIG_F2FS_FS_XATTR
 297                 case Opt_user_xattr:
 298                         set_opt(sbi, XATTR_USER);
 299                         break;
 300                 case Opt_nouser_xattr:
 301                         clear_opt(sbi, XATTR_USER);
 302                         break;
 303                 case Opt_inline_xattr:
 304                         set_opt(sbi, INLINE_XATTR);
 305                         break;
 306 #else
 307                 case Opt_user_xattr:
 308                         f2fs_msg(sb, KERN_INFO,
 309                                 "user_xattr options not supported");
 310                         break;
 311                 case Opt_nouser_xattr:
 312                         f2fs_msg(sb, KERN_INFO,
 313                                 "nouser_xattr options not supported");
 314                         break;
 315                 case Opt_inline_xattr:
 316                         f2fs_msg(sb, KERN_INFO,
 317                                 "inline_xattr options not supported");
 318                         break;
 319 #endif
 320 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 321                 case Opt_acl:
 322                         set_opt(sbi, POSIX_ACL);
 323                         break;
 324                 case Opt_noacl:
 325                         clear_opt(sbi, POSIX_ACL);
 326                         break;
 327 #else
 328                 case Opt_acl:
 329                         f2fs_msg(sb, KERN_INFO, "acl options not supported");
 330                         break;
 331                 case Opt_noacl:
 332                         f2fs_msg(sb, KERN_INFO, "noacl options not supported");
 333                         break;
 334 #endif
 335                 case Opt_active_logs:
 336                         if (args->from && match_int(args, &arg))
 337                                 return -EINVAL;
 338                         if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
 339                                 return -EINVAL;
 340                         sbi->active_logs = arg;
 341                         break;
 342                 case Opt_disable_ext_identify:
 343                         set_opt(sbi, DISABLE_EXT_IDENTIFY);
 344                         break;
 345                 case Opt_inline_data:
 346                         set_opt(sbi, INLINE_DATA);
 347                         break;
 348                 case Opt_inline_dentry:
 349                         set_opt(sbi, INLINE_DENTRY);
 350                         break;
 351                 case Opt_flush_merge:
 352                         set_opt(sbi, FLUSH_MERGE);
 353                         break;
 354                 case Opt_nobarrier:
 355                         set_opt(sbi, NOBARRIER);
 356                         break;
 357                 case Opt_fastboot:
 358                         set_opt(sbi, FASTBOOT);
 359                         break;
 360                 default:
 361                         f2fs_msg(sb, KERN_ERR,
 362                                 "Unrecognized mount option \"%s\" or missing value",
 363                                 p);
 364                         return -EINVAL;
 365                 }
 366         }
 367         return 0;
 368 }
 369
 370 static struct inode *f2fs_alloc_inode(struct super_block *sb)
 371 {
 372         struct f2fs_inode_info *fi;
 373
 374         fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
 375         if (!fi)
 376                 return NULL;
 377
 378         init_once((void *) fi);
 379
 380         /* Initialize f2fs-specific inode info */
 381         fi->vfs_inode.i_version = 1;
 382         atomic_set(&fi->dirty_pages, 0);
 383         fi->i_current_depth = 1;
 384         fi->i_advise = 0;
 385         rwlock_init(&fi->ext.ext_lock);
 386         init_rwsem(&fi->i_sem);
 387         INIT_RADIX_TREE(&fi->inmem_root, GFP_NOFS);
 388         INIT_LIST_HEAD(&fi->inmem_pages);
 389         mutex_init(&fi->inmem_lock);
 390
 391         set_inode_flag(fi, FI_NEW_INODE);
 392
 393         if (test_opt(F2FS_SB(sb), INLINE_XATTR))
 394                 set_inode_flag(fi, FI_INLINE_XATTR);
 395
 396         /* Will be used by directory only */
 397         fi->i_dir_level = F2FS_SB(sb)->dir_level;
 398
 399         return &fi->vfs_inode;
 400 }
 401
 402 static int f2fs_drop_inode(struct inode *inode)
 403 {
 404         /*
 405          * This is to avoid a deadlock condition like below.
 406          * writeback_single_inode(inode)
 407          *  - f2fs_write_data_page
 408          *    - f2fs_gc -> iput -> evict
 409          *       - inode_wait_for_writeback(inode)
 410          */
 411         if (!inode_unhashed(inode) && inode->i_state & I_SYNC)
 412                 return 0;
 413         return generic_drop_inode(inode);
 414 }
 415
 416 /*
 417  * f2fs_dirty_inode() is called from __mark_inode_dirty()
 418  *
 419  * We should call set_dirty_inode to write the dirty inode through write_inode.
 420  */
 421 static void f2fs_dirty_inode(struct inode *inode, int flags)
 422 {
 423         set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
 424 }
 425
 426 static void f2fs_i_callback(struct rcu_head *head)
 427 {
 428         struct inode *inode = container_of(head, struct inode, i_rcu);
 429         kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
 430 }
 431
 432 static void f2fs_destroy_inode(struct inode *inode)
 433 {
 434         call_rcu(&inode->i_rcu, f2fs_i_callback);
 435 }
 436
 437 static void f2fs_put_super(struct super_block *sb)
 438 {
 439         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 440
 441         if (sbi->s_proc) {
 442                 remove_proc_entry("segment_info", sbi->s_proc);
 443                 remove_proc_entry(sb->s_id, f2fs_proc_root);
 444         }
 445         kobject_del(&sbi->s_kobj);
 446
 447         f2fs_destroy_stats(sbi);
 448         stop_gc_thread(sbi);
 449
 450         /* We don't need to do checkpoint when it's clean */
 451         if (sbi->s_dirty) {
 452                 struct cp_control cpc = {
 453                         .reason = CP_UMOUNT,
 454                 };
 455                 write_checkpoint(sbi, &cpc);
 456         }
 457
 458         /*
 459          * normally superblock is clean, so we need to release this.
 460          * In addition, EIO will skip do checkpoint, we need this as well.
 461          */
 462         release_dirty_inode(sbi);
 463         release_discard_addrs(sbi);
 464
 465         iput(sbi->node_inode);
 466         iput(sbi->meta_inode);
 467
 468         /* destroy f2fs internal modules */
 469         destroy_node_manager(sbi);
 470         destroy_segment_manager(sbi);
 471
 472         kfree(sbi->ckpt);
 473         kobject_put(&sbi->s_kobj);
 474         wait_for_completion(&sbi->s_kobj_unregister);
 475
 476         sb->s_fs_info = NULL;
 477         brelse(sbi->raw_super_buf);
 478         kfree(sbi);
 479 }
 480
 481 int f2fs_sync_fs(struct super_block *sb, int sync)
 482 {
 483         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 484
 485         trace_f2fs_sync_fs(sb, sync);
 486
 487         if (sync) {
 488                 struct cp_control cpc;
 489
 490                 cpc.reason = test_opt(sbi, FASTBOOT) ? CP_UMOUNT : CP_SYNC;
 491                 mutex_lock(&sbi->gc_mutex);
 492                 write_checkpoint(sbi, &cpc);
 493                 mutex_unlock(&sbi->gc_mutex);
 494         } else {
 495                 f2fs_balance_fs(sbi);
 496         }
 497         f2fs_trace_ios(NULL, NULL, 1);
 498
 499         return 0;
 500 }
 501
 502 static int f2fs_freeze(struct super_block *sb)
 503 {
 504         int err;
 505
 506         if (f2fs_readonly(sb))
 507                 return 0;
 508
 509         err = f2fs_sync_fs(sb, 1);
 510         return err;
 511 }
 512
 513 static int f2fs_unfreeze(struct super_block *sb)
 514 {
 515         return 0;
 516 }
 517
 518 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
 519 {
 520         struct super_block *sb = dentry->d_sb;
 521         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 522         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 523         block_t total_count, user_block_count, start_count, ovp_count;
 524
 525         total_count = le64_to_cpu(sbi->raw_super->block_count);
 526         user_block_count = sbi->user_block_count;
 527         start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
 528         ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
 529         buf->f_type = F2FS_SUPER_MAGIC;
 530         buf->f_bsize = sbi->blocksize;
 531
 532         buf->f_blocks = total_count - start_count;
 533         buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
 534         buf->f_bavail = user_block_count - valid_user_blocks(sbi);
 535
 536         buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
 537         buf->f_ffree = buf->f_files - valid_inode_count(sbi);
 538
 539         buf->f_namelen = F2FS_NAME_LEN;
 540         buf->f_fsid.val[0] = (u32)id;
 541         buf->f_fsid.val[1] = (u32)(id >> 32);
 542
 543         return 0;
 544 }
 545
 546 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
 547 {
 548         struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
 549
 550         if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC))
 551                 seq_printf(seq, ",background_gc=%s", "on");
 552         else
 553                 seq_printf(seq, ",background_gc=%s", "off");
 554         if (test_opt(sbi, DISABLE_ROLL_FORWARD))
 555                 seq_puts(seq, ",disable_roll_forward");
 556         if (test_opt(sbi, DISCARD))
 557                 seq_puts(seq, ",discard");
 558         if (test_opt(sbi, NOHEAP))
 559                 seq_puts(seq, ",no_heap_alloc");
 560 #ifdef CONFIG_F2FS_FS_XATTR
 561         if (test_opt(sbi, XATTR_USER))
 562                 seq_puts(seq, ",user_xattr");
 563         else
 564                 seq_puts(seq, ",nouser_xattr");
 565         if (test_opt(sbi, INLINE_XATTR))
 566                 seq_puts(seq, ",inline_xattr");
 567 #endif
 568 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 569         if (test_opt(sbi, POSIX_ACL))
 570                 seq_puts(seq, ",acl");
 571         else
 572                 seq_puts(seq, ",noacl");
 573 #endif
 574         if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
 575                 seq_puts(seq, ",disable_ext_identify");
 576         if (test_opt(sbi, INLINE_DATA))
 577                 seq_puts(seq, ",inline_data");
 578         if (test_opt(sbi, INLINE_DENTRY))
 579                 seq_puts(seq, ",inline_dentry");
 580         if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
 581                 seq_puts(seq, ",flush_merge");
 582         if (test_opt(sbi, NOBARRIER))
 583                 seq_puts(seq, ",nobarrier");
 584         if (test_opt(sbi, FASTBOOT))
 585                 seq_puts(seq, ",fastboot");
 586         seq_printf(seq, ",active_logs=%u", sbi->active_logs);
 587
 588         return 0;
 589 }
 590
 591 static int segment_info_seq_show(struct seq_file *seq, void *offset)
 592 {
 593         struct super_block *sb = seq->private;
 594         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 595         unsigned int total_segs =
 596                         le32_to_cpu(sbi->raw_super->segment_count_main);
 597         int i;
 598
 599         seq_puts(seq, "format: segment_type|valid_blocks\n"
 600                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
 601
 602         for (i = 0; i < total_segs; i++) {
 603                 struct seg_entry *se = get_seg_entry(sbi, i);
 604
 605                 if ((i % 10) == 0)
 606                         seq_printf(seq, "%-5d", i);
 607                 seq_printf(seq, "%d|%-3u", se->type,
 608                                         get_valid_blocks(sbi, i, 1));
 609                 if ((i % 10) == 9 || i == (total_segs - 1))
 610                         seq_putc(seq, '\n');
 611                 else
 612                         seq_putc(seq, ' ');
 613         }
 614
 615         return 0;
 616 }
 617
 618 static int segment_info_open_fs(struct inode *inode, struct file *file)
 619 {
 620         return single_open(file, segment_info_seq_show, PDE_DATA(inode));
 621 }
 622
 623 static const struct file_operations f2fs_seq_segment_info_fops = {
 624         .owner = THIS_MODULE,
 625         .open = segment_info_open_fs,
 626         .read = seq_read,
 627         .llseek = seq_lseek,
 628         .release = single_release,
 629 };
 630
 631 static int f2fs_remount(struct super_block *sb, int *flags, char *data)
 632 {
 633         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 634         struct f2fs_mount_info org_mount_opt;
 635         int err, active_logs;
 636         bool need_restart_gc = false;
 637         bool need_stop_gc = false;
 638
 639         sync_filesystem(sb);
 640
 641         /*
 642          * Save the old mount options in case we
 643          * need to restore them.
 644          */
 645         org_mount_opt = sbi->mount_opt;
 646         active_logs = sbi->active_logs;
 647
 648         sbi->mount_opt.opt = 0;
 649         sbi->active_logs = NR_CURSEG_TYPE;
 650
 651         /* parse mount options */
 652         err = parse_options(sb, data);
 653         if (err)
 654                 goto restore_opts;
 655
 656         /*
 657          * Previous and new state of filesystem is RO,
 658          * so skip checking GC and FLUSH_MERGE conditions.
 659          */
 660         if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
 661                 goto skip;
 662
 663         /*
 664          * We stop the GC thread if FS is mounted as RO
 665          * or if background_gc = off is passed in mount
 666          * option. Also sync the filesystem.
 667          */
 668         if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
 669                 if (sbi->gc_thread) {
 670                         stop_gc_thread(sbi);
 671                         f2fs_sync_fs(sb, 1);
 672                         need_restart_gc = true;
 673                 }
 674         } else if (!sbi->gc_thread) {
 675                 err = start_gc_thread(sbi);
 676                 if (err)
 677                         goto restore_opts;
 678                 need_stop_gc = true;
 679         }
 680
 681         /*
 682          * We stop issue flush thread if FS is mounted as RO
 683          * or if flush_merge is not passed in mount option.
 684          */
 685         if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
 686                 destroy_flush_cmd_control(sbi);
 687         } else if (!SM_I(sbi)->cmd_control_info) {
 688                 err = create_flush_cmd_control(sbi);
 689                 if (err)
 690                         goto restore_gc;
 691         }
 692 skip:
 693         /* Update the POSIXACL Flag */
 694          sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 695                 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
 696         return 0;
 697 restore_gc:
 698         if (need_restart_gc) {
 699                 if (start_gc_thread(sbi))
 700                         f2fs_msg(sbi->sb, KERN_WARNING,
 701                                 "background gc thread has stopped");
 702         } else if (need_stop_gc) {
 703                 stop_gc_thread(sbi);
 704         }
 705 restore_opts:
 706         sbi->mount_opt = org_mount_opt;
 707         sbi->active_logs = active_logs;
 708         return err;
 709 }
 710
 711 static struct super_operations f2fs_sops = {
 712         .alloc_inode    = f2fs_alloc_inode,
 713         .drop_inode     = f2fs_drop_inode,
 714         .destroy_inode  = f2fs_destroy_inode,
 715         .write_inode    = f2fs_write_inode,
 716         .dirty_inode    = f2fs_dirty_inode,
 717         .show_options   = f2fs_show_options,
 718         .evict_inode    = f2fs_evict_inode,
 719         .put_super      = f2fs_put_super,
 720         .sync_fs        = f2fs_sync_fs,
 721         .freeze_fs      = f2fs_freeze,
 722         .unfreeze_fs    = f2fs_unfreeze,
 723         .statfs         = f2fs_statfs,
 724         .remount_fs     = f2fs_remount,
 725 };
 726
 727 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
 728                 u64 ino, u32 generation)
 729 {
 730         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 731         struct inode *inode;
 732
 733         if (check_nid_range(sbi, ino))
 734                 return ERR_PTR(-ESTALE);
 735
 736         /*
 737          * f2fs_iget isn't quite right if the inode is currently unallocated!
 738          * However f2fs_iget currently does appropriate checks to handle stale
 739          * inodes so everything is OK.
 740          */
 741         inode = f2fs_iget(sb, ino);
 742         if (IS_ERR(inode))
 743                 return ERR_CAST(inode);
 744         if (unlikely(generation && inode->i_generation != generation)) {
 745                 /* we didn't find the right inode.. */
 746                 iput(inode);
 747                 return ERR_PTR(-ESTALE);
 748         }
 749         return inode;
 750 }
 751
 752 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
 753                 int fh_len, int fh_type)
 754 {
 755         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 756                                     f2fs_nfs_get_inode);
 757 }
 758
 759 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
 760                 int fh_len, int fh_type)
 761 {
 762         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 763                                     f2fs_nfs_get_inode);
 764 }
 765
 766 static const struct export_operations f2fs_export_ops = {
 767         .fh_to_dentry = f2fs_fh_to_dentry,
 768         .fh_to_parent = f2fs_fh_to_parent,
 769         .get_parent = f2fs_get_parent,
 770 };
 771
 772 static loff_t max_file_size(unsigned bits)
 773 {
 774         loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
 775         loff_t leaf_count = ADDRS_PER_BLOCK;
 776
 777         /* two direct node blocks */
 778         result += (leaf_count * 2);
 779
 780         /* two indirect node blocks */
 781         leaf_count *= NIDS_PER_BLOCK;
 782         result += (leaf_count * 2);
 783
 784         /* one double indirect node block */
 785         leaf_count *= NIDS_PER_BLOCK;
 786         result += leaf_count;
 787
 788         result <<= bits;
 789         return result;
 790 }
 791
 792 static int sanity_check_raw_super(struct super_block *sb,
 793                         struct f2fs_super_block *raw_super)
 794 {
 795         unsigned int blocksize;
 796
 797         if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
 798                 f2fs_msg(sb, KERN_INFO,
 799                         "Magic Mismatch, valid(0x%x) - read(0x%x)",
 800                         F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
 801                 return 1;
 802         }
 803
 804         /* Currently, support only 4KB page cache size */
 805         if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
 806                 f2fs_msg(sb, KERN_INFO,
 807                         "Invalid page_cache_size (%lu), supports only 4KB\n",
 808                         PAGE_CACHE_SIZE);
 809                 return 1;
 810         }
 811
 812         /* Currently, support only 4KB block size */
 813         blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
 814         if (blocksize != F2FS_BLKSIZE) {
 815                 f2fs_msg(sb, KERN_INFO,
 816                         "Invalid blocksize (%u), supports only 4KB\n",
 817                         blocksize);
 818                 return 1;
 819         }
 820
 821         /* Currently, support 512/1024/2048/4096 bytes sector size */
 822         if (le32_to_cpu(raw_super->log_sectorsize) >
 823                                 F2FS_MAX_LOG_SECTOR_SIZE ||
 824                 le32_to_cpu(raw_super->log_sectorsize) <
 825                                 F2FS_MIN_LOG_SECTOR_SIZE) {
 826                 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)",
 827                         le32_to_cpu(raw_super->log_sectorsize));
 828                 return 1;
 829         }
 830         if (le32_to_cpu(raw_super->log_sectors_per_block) +
 831                 le32_to_cpu(raw_super->log_sectorsize) !=
 832                         F2FS_MAX_LOG_SECTOR_SIZE) {
 833                 f2fs_msg(sb, KERN_INFO,
 834                         "Invalid log sectors per block(%u) log sectorsize(%u)",
 835                         le32_to_cpu(raw_super->log_sectors_per_block),
 836                         le32_to_cpu(raw_super->log_sectorsize));
 837                 return 1;
 838         }
 839         return 0;
 840 }
 841
 842 static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
 843 {
 844         unsigned int total, fsmeta;
 845         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
 846         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 847
 848         total = le32_to_cpu(raw_super->segment_count);
 849         fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
 850         fsmeta += le32_to_cpu(raw_super->segment_count_sit);
 851         fsmeta += le32_to_cpu(raw_super->segment_count_nat);
 852         fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
 853         fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
 854
 855         if (unlikely(fsmeta >= total))
 856                 return 1;
 857
 858         if (unlikely(f2fs_cp_error(sbi))) {
 859                 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
 860                 return 1;
 861         }
 862         return 0;
 863 }
 864
 865 static void init_sb_info(struct f2fs_sb_info *sbi)
 866 {
 867         struct f2fs_super_block *raw_super = sbi->raw_super;
 868         int i;
 869
 870         sbi->log_sectors_per_block =
 871                 le32_to_cpu(raw_super->log_sectors_per_block);
 872         sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
 873         sbi->blocksize = 1 << sbi->log_blocksize;
 874         sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
 875         sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
 876         sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
 877         sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
 878         sbi->total_sections = le32_to_cpu(raw_super->section_count);
 879         sbi->total_node_count =
 880                 (le32_to_cpu(raw_super->segment_count_nat) / 2)
 881                         * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
 882         sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
 883         sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
 884         sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
 885         sbi->cur_victim_sec = NULL_SECNO;
 886         sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
 887
 888         for (i = 0; i < NR_COUNT_TYPE; i++)
 889                 atomic_set(&sbi->nr_pages[i], 0);
 890
 891         sbi->dir_level = DEF_DIR_LEVEL;
 892         sbi->need_fsck = false;
 893 }
 894
 895 /*
 896  * Read f2fs raw super block.
 897  * Because we have two copies of super block, so read the first one at first,
 898  * if the first one is invalid, move to read the second one.
 899  */
 900 static int read_raw_super_block(struct super_block *sb,
 901                         struct f2fs_super_block **raw_super,
 902                         struct buffer_head **raw_super_buf)
 903 {
 904         int block = 0;
 905
 906 retry:
 907         *raw_super_buf = sb_bread(sb, block);
 908         if (!*raw_super_buf) {
 909                 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
 910                                 block + 1);
 911                 if (block == 0) {
 912                         block++;
 913                         goto retry;
 914                 } else {
 915                         return -EIO;
 916                 }
 917         }
 918
 919         *raw_super = (struct f2fs_super_block *)
 920                 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
 921
 922         /* sanity checking of raw super */
 923         if (sanity_check_raw_super(sb, *raw_super)) {
 924                 brelse(*raw_super_buf);
 925                 f2fs_msg(sb, KERN_ERR,
 926                         "Can't find valid F2FS filesystem in %dth superblock",
 927                                                                 block + 1);
 928                 if (block == 0) {
 929                         block++;
 930                         goto retry;
 931                 } else {
 932                         return -EINVAL;
 933                 }
 934         }
 935
 936         return 0;
 937 }
 938
 939 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 940 {
 941         struct f2fs_sb_info *sbi;
 942         struct f2fs_super_block *raw_super = NULL;
 943         struct buffer_head *raw_super_buf;
 944         struct inode *root;
 945         long err = -EINVAL;
 946         bool retry = true;
 947         int i;
 948
 949 try_onemore:
 950         /* allocate memory for f2fs-specific super block info */
 951         sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
 952         if (!sbi)
 953                 return -ENOMEM;
 954
 955         /* set a block size */
 956         if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
 957                 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
 958                 goto free_sbi;
 959         }
 960
 961         err = read_raw_super_block(sb, &raw_super, &raw_super_buf);
 962         if (err)
 963                 goto free_sbi;
 964
 965         sb->s_fs_info = sbi;
 966         /* init some FS parameters */
 967         sbi->active_logs = NR_CURSEG_TYPE;
 968
 969         set_opt(sbi, BG_GC);
 970
 971 #ifdef CONFIG_F2FS_FS_XATTR
 972         set_opt(sbi, XATTR_USER);
 973 #endif
 974 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 975         set_opt(sbi, POSIX_ACL);
 976 #endif
 977         /* parse mount options */
 978         err = parse_options(sb, (char *)data);
 979         if (err)
 980                 goto free_sb_buf;
 981
 982         sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
 983         sb->s_max_links = F2FS_LINK_MAX;
 984         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
 985
 986         sb->s_op = &f2fs_sops;
 987         sb->s_xattr = f2fs_xattr_handlers;
 988         sb->s_export_op = &f2fs_export_ops;
 989         sb->s_magic = F2FS_SUPER_MAGIC;
 990         sb->s_time_gran = 1;
 991         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 992                 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
 993         memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
 994
 995         /* init f2fs-specific super block info */
 996         sbi->sb = sb;
 997         sbi->raw_super = raw_super;
 998         sbi->raw_super_buf = raw_super_buf;
 999         mutex_init(&sbi->gc_mutex);
1000         mutex_init(&sbi->writepages);
1001         mutex_init(&sbi->cp_mutex);
1002         init_rwsem(&sbi->node_write);
1003         sbi->por_doing = false;
1004         spin_lock_init(&sbi->stat_lock);
1005
1006         init_rwsem(&sbi->read_io.io_rwsem);
1007         sbi->read_io.sbi = sbi;
1008         sbi->read_io.bio = NULL;
1009         for (i = 0; i < NR_PAGE_TYPE; i++) {
1010                 init_rwsem(&sbi->write_io[i].io_rwsem);
1011                 sbi->write_io[i].sbi = sbi;
1012                 sbi->write_io[i].bio = NULL;
1013         }
1014
1015         init_rwsem(&sbi->cp_rwsem);
1016         init_waitqueue_head(&sbi->cp_wait);
1017         init_sb_info(sbi);
1018
1019         /* get an inode for meta space */
1020         sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
1021         if (IS_ERR(sbi->meta_inode)) {
1022                 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
1023                 err = PTR_ERR(sbi->meta_inode);
1024                 goto free_sb_buf;
1025         }
1026
1027         err = get_valid_checkpoint(sbi);
1028         if (err) {
1029                 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
1030                 goto free_meta_inode;
1031         }
1032
1033         /* sanity checking of checkpoint */
1034         err = -EINVAL;
1035         if (sanity_check_ckpt(sbi)) {
1036                 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
1037                 goto free_cp;
1038         }
1039
1040         sbi->total_valid_node_count =
1041                                 le32_to_cpu(sbi->ckpt->valid_node_count);
1042         sbi->total_valid_inode_count =
1043                                 le32_to_cpu(sbi->ckpt->valid_inode_count);
1044         sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
1045         sbi->total_valid_block_count =
1046                                 le64_to_cpu(sbi->ckpt->valid_block_count);
1047         sbi->last_valid_block_count = sbi->total_valid_block_count;
1048         sbi->alloc_valid_block_count = 0;
1049         INIT_LIST_HEAD(&sbi->dir_inode_list);
1050         spin_lock_init(&sbi->dir_inode_lock);
1051
1052         init_ino_entry_info(sbi);
1053
1054         /* setup f2fs internal modules */
1055         err = build_segment_manager(sbi);
1056         if (err) {
1057                 f2fs_msg(sb, KERN_ERR,
1058                         "Failed to initialize F2FS segment manager");
1059                 goto free_sm;
1060         }
1061         err = build_node_manager(sbi);
1062         if (err) {
1063                 f2fs_msg(sb, KERN_ERR,
1064                         "Failed to initialize F2FS node manager");
1065                 goto free_nm;
1066         }
1067
1068         build_gc_manager(sbi);
1069
1070         /* get an inode for node space */
1071         sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
1072         if (IS_ERR(sbi->node_inode)) {
1073                 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
1074                 err = PTR_ERR(sbi->node_inode);
1075                 goto free_nm;
1076         }
1077
1078         /* if there are nt orphan nodes free them */
1079         recover_orphan_inodes(sbi);
1080
1081         /* read root inode and dentry */
1082         root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
1083         if (IS_ERR(root)) {
1084                 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
1085                 err = PTR_ERR(root);
1086                 goto free_node_inode;
1087         }
1088         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1089                 iput(root);
1090                 err = -EINVAL;
1091                 goto free_node_inode;
1092         }
1093
1094         sb->s_root = d_make_root(root); /* allocate root dentry */
1095         if (!sb->s_root) {
1096                 err = -ENOMEM;
1097                 goto free_root_inode;
1098         }
1099
1100         err = f2fs_build_stats(sbi);
1101         if (err)
1102                 goto free_root_inode;
1103
1104         if (f2fs_proc_root)
1105                 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
1106
1107         if (sbi->s_proc)
1108                 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
1109                                  &f2fs_seq_segment_info_fops, sb);
1110
1111         if (test_opt(sbi, DISCARD)) {
1112                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1113                 if (!blk_queue_discard(q))
1114                         f2fs_msg(sb, KERN_WARNING,
1115                                         "mounting with \"discard\" option, but "
1116                                         "the device does not support discard");
1117         }
1118
1119         sbi->s_kobj.kset = f2fs_kset;
1120         init_completion(&sbi->s_kobj_unregister);
1121         err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1122                                                         "%s", sb->s_id);
1123         if (err)
1124                 goto free_proc;
1125
1126         if (!retry)
1127                 sbi->need_fsck = true;
1128
1129         /* recover fsynced data */
1130         if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1131                 err = recover_fsync_data(sbi);
1132                 if (err) {
1133                         f2fs_msg(sb, KERN_ERR,
1134                                 "Cannot recover all fsync data errno=%ld", err);
1135                         goto free_kobj;
1136                 }
1137         }
1138
1139         /*
1140          * If filesystem is not mounted as read-only then
1141          * do start the gc_thread.
1142          */
1143         if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) {
1144                 /* After POR, we can run background GC thread.*/
1145                 err = start_gc_thread(sbi);
1146                 if (err)
1147                         goto free_kobj;
1148         }
1149         return 0;
1150
1151 free_kobj:
1152         kobject_del(&sbi->s_kobj);
1153 free_proc:
1154         if (sbi->s_proc) {
1155                 remove_proc_entry("segment_info", sbi->s_proc);
1156                 remove_proc_entry(sb->s_id, f2fs_proc_root);
1157         }
1158         f2fs_destroy_stats(sbi);
1159 free_root_inode:
1160         dput(sb->s_root);
1161         sb->s_root = NULL;
1162 free_node_inode:
1163         iput(sbi->node_inode);
1164 free_nm:
1165         destroy_node_manager(sbi);
1166 free_sm:
1167         destroy_segment_manager(sbi);
1168 free_cp:
1169         kfree(sbi->ckpt);
1170 free_meta_inode:
1171         make_bad_inode(sbi->meta_inode);
1172         iput(sbi->meta_inode);
1173 free_sb_buf:
1174         brelse(raw_super_buf);
1175 free_sbi:
1176         kfree(sbi);
1177
1178         /* give only one another chance */
1179         if (retry) {
1180                 retry = 0;
1181                 shrink_dcache_sb(sb);
1182                 goto try_onemore;
1183         }
1184         return err;
1185 }
1186
1187 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
1188                         const char *dev_name, void *data)
1189 {
1190         return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
1191 }
1192
1193 static struct file_system_type f2fs_fs_type = {
1194         .owner          = THIS_MODULE,
1195         .name           = "f2fs",
1196         .mount          = f2fs_mount,
1197         .kill_sb        = kill_block_super,
1198         .fs_flags       = FS_REQUIRES_DEV,
1199 };
1200 MODULE_ALIAS_FS("f2fs");
1201
1202 static int __init init_inodecache(void)
1203 {
1204         f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
1205                         sizeof(struct f2fs_inode_info));
1206         if (!f2fs_inode_cachep)
1207                 return -ENOMEM;
1208         return 0;
1209 }
1210
1211 static void destroy_inodecache(void)
1212 {
1213         /*
1214          * Make sure all delayed rcu free inodes are flushed before we
1215          * destroy cache.
1216          */
1217         rcu_barrier();
1218         kmem_cache_destroy(f2fs_inode_cachep);
1219 }
1220
1221 static int __init init_f2fs_fs(void)
1222 {
1223         int err;
1224
1225         err = init_inodecache();
1226         if (err)
1227                 goto fail;
1228         err = create_node_manager_caches();
1229         if (err)
1230                 goto free_inodecache;
1231         err = create_segment_manager_caches();
1232         if (err)
1233                 goto free_node_manager_caches;
1234         err = create_checkpoint_caches();
1235         if (err)
1236                 goto free_segment_manager_caches;
1237         f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
1238         if (!f2fs_kset) {
1239                 err = -ENOMEM;
1240                 goto free_checkpoint_caches;
1241         }
1242         err = register_filesystem(&f2fs_fs_type);
1243         if (err)
1244                 goto free_kset;
1245         f2fs_create_root_stats();
1246         f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1247         return 0;
1248
1249 free_kset:
1250         kset_unregister(f2fs_kset);
1251 free_checkpoint_caches:
1252         destroy_checkpoint_caches();
1253 free_segment_manager_caches:
1254         destroy_segment_manager_caches();
1255 free_node_manager_caches:
1256         destroy_node_manager_caches();
1257 free_inodecache:
1258         destroy_inodecache();
1259 fail:
1260         return err;
1261 }
1262
1263 static void __exit exit_f2fs_fs(void)
1264 {
1265         remove_proc_entry("fs/f2fs", NULL);
1266         f2fs_destroy_root_stats();
1267         unregister_filesystem(&f2fs_fs_type);
1268         destroy_checkpoint_caches();
1269         destroy_segment_manager_caches();
1270         destroy_node_manager_caches();
1271         destroy_inodecache();
1272         kset_unregister(f2fs_kset);
1273 }
1274
1275 module_init(init_f2fs_fs)
1276 module_exit(exit_f2fs_fs)
1277
1278 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1279 MODULE_DESCRIPTION("Flash Friendly File System");
1280 MODULE_LICENSE("GPL");