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         /*
 451          * We don't need to do checkpoint when superblock is clean.
 452          * But, the previous checkpoint was not done by umount, it needs to do
 453          * clean checkpoint again.
 454          */
 455         if (sbi->s_dirty ||
 456                         !is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) {
 457                 struct cp_control cpc = {
 458                         .reason = CP_UMOUNT,
 459                 };
 460                 write_checkpoint(sbi, &cpc);
 461         }
 462
 463         /*
 464          * normally superblock is clean, so we need to release this.
 465          * In addition, EIO will skip do checkpoint, we need this as well.
 466          */
 467         release_dirty_inode(sbi);
 468         release_discard_addrs(sbi);
 469
 470         iput(sbi->node_inode);
 471         iput(sbi->meta_inode);
 472
 473         /* destroy f2fs internal modules */
 474         destroy_node_manager(sbi);
 475         destroy_segment_manager(sbi);
 476
 477         kfree(sbi->ckpt);
 478         kobject_put(&sbi->s_kobj);
 479         wait_for_completion(&sbi->s_kobj_unregister);
 480
 481         sb->s_fs_info = NULL;
 482         brelse(sbi->raw_super_buf);
 483         kfree(sbi);
 484 }
 485
 486 int f2fs_sync_fs(struct super_block *sb, int sync)
 487 {
 488         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 489
 490         trace_f2fs_sync_fs(sb, sync);
 491
 492         if (sync) {
 493                 struct cp_control cpc;
 494
 495                 cpc.reason = (test_opt(sbi, FASTBOOT) || sbi->s_closing) ?
 496                                                         CP_UMOUNT : CP_SYNC;
 497                 mutex_lock(&sbi->gc_mutex);
 498                 write_checkpoint(sbi, &cpc);
 499                 mutex_unlock(&sbi->gc_mutex);
 500         } else {
 501                 f2fs_balance_fs(sbi);
 502         }
 503         f2fs_trace_ios(NULL, NULL, 1);
 504
 505         return 0;
 506 }
 507
 508 static int f2fs_freeze(struct super_block *sb)
 509 {
 510         int err;
 511
 512         if (f2fs_readonly(sb))
 513                 return 0;
 514
 515         err = f2fs_sync_fs(sb, 1);
 516         return err;
 517 }
 518
 519 static int f2fs_unfreeze(struct super_block *sb)
 520 {
 521         return 0;
 522 }
 523
 524 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
 525 {
 526         struct super_block *sb = dentry->d_sb;
 527         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 528         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 529         block_t total_count, user_block_count, start_count, ovp_count;
 530
 531         total_count = le64_to_cpu(sbi->raw_super->block_count);
 532         user_block_count = sbi->user_block_count;
 533         start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
 534         ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
 535         buf->f_type = F2FS_SUPER_MAGIC;
 536         buf->f_bsize = sbi->blocksize;
 537
 538         buf->f_blocks = total_count - start_count;
 539         buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
 540         buf->f_bavail = user_block_count - valid_user_blocks(sbi);
 541
 542         buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
 543         buf->f_ffree = buf->f_files - valid_inode_count(sbi);
 544
 545         buf->f_namelen = F2FS_NAME_LEN;
 546         buf->f_fsid.val[0] = (u32)id;
 547         buf->f_fsid.val[1] = (u32)(id >> 32);
 548
 549         return 0;
 550 }
 551
 552 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
 553 {
 554         struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
 555
 556         if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC))
 557                 seq_printf(seq, ",background_gc=%s", "on");
 558         else
 559                 seq_printf(seq, ",background_gc=%s", "off");
 560         if (test_opt(sbi, DISABLE_ROLL_FORWARD))
 561                 seq_puts(seq, ",disable_roll_forward");
 562         if (test_opt(sbi, DISCARD))
 563                 seq_puts(seq, ",discard");
 564         if (test_opt(sbi, NOHEAP))
 565                 seq_puts(seq, ",no_heap_alloc");
 566 #ifdef CONFIG_F2FS_FS_XATTR
 567         if (test_opt(sbi, XATTR_USER))
 568                 seq_puts(seq, ",user_xattr");
 569         else
 570                 seq_puts(seq, ",nouser_xattr");
 571         if (test_opt(sbi, INLINE_XATTR))
 572                 seq_puts(seq, ",inline_xattr");
 573 #endif
 574 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 575         if (test_opt(sbi, POSIX_ACL))
 576                 seq_puts(seq, ",acl");
 577         else
 578                 seq_puts(seq, ",noacl");
 579 #endif
 580         if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
 581                 seq_puts(seq, ",disable_ext_identify");
 582         if (test_opt(sbi, INLINE_DATA))
 583                 seq_puts(seq, ",inline_data");
 584         if (test_opt(sbi, INLINE_DENTRY))
 585                 seq_puts(seq, ",inline_dentry");
 586         if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
 587                 seq_puts(seq, ",flush_merge");
 588         if (test_opt(sbi, NOBARRIER))
 589                 seq_puts(seq, ",nobarrier");
 590         if (test_opt(sbi, FASTBOOT))
 591                 seq_puts(seq, ",fastboot");
 592         seq_printf(seq, ",active_logs=%u", sbi->active_logs);
 593
 594         return 0;
 595 }
 596
 597 static int segment_info_seq_show(struct seq_file *seq, void *offset)
 598 {
 599         struct super_block *sb = seq->private;
 600         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 601         unsigned int total_segs =
 602                         le32_to_cpu(sbi->raw_super->segment_count_main);
 603         int i;
 604
 605         seq_puts(seq, "format: segment_type|valid_blocks\n"
 606                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
 607
 608         for (i = 0; i < total_segs; i++) {
 609                 struct seg_entry *se = get_seg_entry(sbi, i);
 610
 611                 if ((i % 10) == 0)
 612                         seq_printf(seq, "%-5d", i);
 613                 seq_printf(seq, "%d|%-3u", se->type,
 614                                         get_valid_blocks(sbi, i, 1));
 615                 if ((i % 10) == 9 || i == (total_segs - 1))
 616                         seq_putc(seq, '\n');
 617                 else
 618                         seq_putc(seq, ' ');
 619         }
 620
 621         return 0;
 622 }
 623
 624 static int segment_info_open_fs(struct inode *inode, struct file *file)
 625 {
 626         return single_open(file, segment_info_seq_show, PDE_DATA(inode));
 627 }
 628
 629 static const struct file_operations f2fs_seq_segment_info_fops = {
 630         .owner = THIS_MODULE,
 631         .open = segment_info_open_fs,
 632         .read = seq_read,
 633         .llseek = seq_lseek,
 634         .release = single_release,
 635 };
 636
 637 static int f2fs_remount(struct super_block *sb, int *flags, char *data)
 638 {
 639         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 640         struct f2fs_mount_info org_mount_opt;
 641         int err, active_logs;
 642         bool need_restart_gc = false;
 643         bool need_stop_gc = false;
 644
 645         sync_filesystem(sb);
 646
 647         /*
 648          * Save the old mount options in case we
 649          * need to restore them.
 650          */
 651         org_mount_opt = sbi->mount_opt;
 652         active_logs = sbi->active_logs;
 653
 654         sbi->mount_opt.opt = 0;
 655         sbi->active_logs = NR_CURSEG_TYPE;
 656
 657         /* parse mount options */
 658         err = parse_options(sb, data);
 659         if (err)
 660                 goto restore_opts;
 661
 662         /*
 663          * Previous and new state of filesystem is RO,
 664          * so skip checking GC and FLUSH_MERGE conditions.
 665          */
 666         if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
 667                 goto skip;
 668
 669         /*
 670          * We stop the GC thread if FS is mounted as RO
 671          * or if background_gc = off is passed in mount
 672          * option. Also sync the filesystem.
 673          */
 674         if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
 675                 if (sbi->gc_thread) {
 676                         stop_gc_thread(sbi);
 677                         f2fs_sync_fs(sb, 1);
 678                         need_restart_gc = true;
 679                 }
 680         } else if (!sbi->gc_thread) {
 681                 err = start_gc_thread(sbi);
 682                 if (err)
 683                         goto restore_opts;
 684                 need_stop_gc = true;
 685         }
 686
 687         /*
 688          * We stop issue flush thread if FS is mounted as RO
 689          * or if flush_merge is not passed in mount option.
 690          */
 691         if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
 692                 destroy_flush_cmd_control(sbi);
 693         } else if (!SM_I(sbi)->cmd_control_info) {
 694                 err = create_flush_cmd_control(sbi);
 695                 if (err)
 696                         goto restore_gc;
 697         }
 698 skip:
 699         /* Update the POSIXACL Flag */
 700          sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 701                 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
 702         return 0;
 703 restore_gc:
 704         if (need_restart_gc) {
 705                 if (start_gc_thread(sbi))
 706                         f2fs_msg(sbi->sb, KERN_WARNING,
 707                                 "background gc thread has stopped");
 708         } else if (need_stop_gc) {
 709                 stop_gc_thread(sbi);
 710         }
 711 restore_opts:
 712         sbi->mount_opt = org_mount_opt;
 713         sbi->active_logs = active_logs;
 714         return err;
 715 }
 716
 717 static struct super_operations f2fs_sops = {
 718         .alloc_inode    = f2fs_alloc_inode,
 719         .drop_inode     = f2fs_drop_inode,
 720         .destroy_inode  = f2fs_destroy_inode,
 721         .write_inode    = f2fs_write_inode,
 722         .dirty_inode    = f2fs_dirty_inode,
 723         .show_options   = f2fs_show_options,
 724         .evict_inode    = f2fs_evict_inode,
 725         .put_super      = f2fs_put_super,
 726         .sync_fs        = f2fs_sync_fs,
 727         .freeze_fs      = f2fs_freeze,
 728         .unfreeze_fs    = f2fs_unfreeze,
 729         .statfs         = f2fs_statfs,
 730         .remount_fs     = f2fs_remount,
 731 };
 732
 733 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
 734                 u64 ino, u32 generation)
 735 {
 736         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 737         struct inode *inode;
 738
 739         if (check_nid_range(sbi, ino))
 740                 return ERR_PTR(-ESTALE);
 741
 742         /*
 743          * f2fs_iget isn't quite right if the inode is currently unallocated!
 744          * However f2fs_iget currently does appropriate checks to handle stale
 745          * inodes so everything is OK.
 746          */
 747         inode = f2fs_iget(sb, ino);
 748         if (IS_ERR(inode))
 749                 return ERR_CAST(inode);
 750         if (unlikely(generation && inode->i_generation != generation)) {
 751                 /* we didn't find the right inode.. */
 752                 iput(inode);
 753                 return ERR_PTR(-ESTALE);
 754         }
 755         return inode;
 756 }
 757
 758 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
 759                 int fh_len, int fh_type)
 760 {
 761         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 762                                     f2fs_nfs_get_inode);
 763 }
 764
 765 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
 766                 int fh_len, int fh_type)
 767 {
 768         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 769                                     f2fs_nfs_get_inode);
 770 }
 771
 772 static const struct export_operations f2fs_export_ops = {
 773         .fh_to_dentry = f2fs_fh_to_dentry,
 774         .fh_to_parent = f2fs_fh_to_parent,
 775         .get_parent = f2fs_get_parent,
 776 };
 777
 778 static loff_t max_file_size(unsigned bits)
 779 {
 780         loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
 781         loff_t leaf_count = ADDRS_PER_BLOCK;
 782
 783         /* two direct node blocks */
 784         result += (leaf_count * 2);
 785
 786         /* two indirect node blocks */
 787         leaf_count *= NIDS_PER_BLOCK;
 788         result += (leaf_count * 2);
 789
 790         /* one double indirect node block */
 791         leaf_count *= NIDS_PER_BLOCK;
 792         result += leaf_count;
 793
 794         result <<= bits;
 795         return result;
 796 }
 797
 798 static int sanity_check_raw_super(struct super_block *sb,
 799                         struct f2fs_super_block *raw_super)
 800 {
 801         unsigned int blocksize;
 802
 803         if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
 804                 f2fs_msg(sb, KERN_INFO,
 805                         "Magic Mismatch, valid(0x%x) - read(0x%x)",
 806                         F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
 807                 return 1;
 808         }
 809
 810         /* Currently, support only 4KB page cache size */
 811         if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
 812                 f2fs_msg(sb, KERN_INFO,
 813                         "Invalid page_cache_size (%lu), supports only 4KB\n",
 814                         PAGE_CACHE_SIZE);
 815                 return 1;
 816         }
 817
 818         /* Currently, support only 4KB block size */
 819         blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
 820         if (blocksize != F2FS_BLKSIZE) {
 821                 f2fs_msg(sb, KERN_INFO,
 822                         "Invalid blocksize (%u), supports only 4KB\n",
 823                         blocksize);
 824                 return 1;
 825         }
 826
 827         /* Currently, support 512/1024/2048/4096 bytes sector size */
 828         if (le32_to_cpu(raw_super->log_sectorsize) >
 829                                 F2FS_MAX_LOG_SECTOR_SIZE ||
 830                 le32_to_cpu(raw_super->log_sectorsize) <
 831                                 F2FS_MIN_LOG_SECTOR_SIZE) {
 832                 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)",
 833                         le32_to_cpu(raw_super->log_sectorsize));
 834                 return 1;
 835         }
 836         if (le32_to_cpu(raw_super->log_sectors_per_block) +
 837                 le32_to_cpu(raw_super->log_sectorsize) !=
 838                         F2FS_MAX_LOG_SECTOR_SIZE) {
 839                 f2fs_msg(sb, KERN_INFO,
 840                         "Invalid log sectors per block(%u) log sectorsize(%u)",
 841                         le32_to_cpu(raw_super->log_sectors_per_block),
 842                         le32_to_cpu(raw_super->log_sectorsize));
 843                 return 1;
 844         }
 845         return 0;
 846 }
 847
 848 static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
 849 {
 850         unsigned int total, fsmeta;
 851         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
 852         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 853
 854         total = le32_to_cpu(raw_super->segment_count);
 855         fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
 856         fsmeta += le32_to_cpu(raw_super->segment_count_sit);
 857         fsmeta += le32_to_cpu(raw_super->segment_count_nat);
 858         fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
 859         fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
 860
 861         if (unlikely(fsmeta >= total))
 862                 return 1;
 863
 864         if (unlikely(f2fs_cp_error(sbi))) {
 865                 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
 866                 return 1;
 867         }
 868         return 0;
 869 }
 870
 871 static void init_sb_info(struct f2fs_sb_info *sbi)
 872 {
 873         struct f2fs_super_block *raw_super = sbi->raw_super;
 874         int i;
 875
 876         sbi->log_sectors_per_block =
 877                 le32_to_cpu(raw_super->log_sectors_per_block);
 878         sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
 879         sbi->blocksize = 1 << sbi->log_blocksize;
 880         sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
 881         sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
 882         sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
 883         sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
 884         sbi->total_sections = le32_to_cpu(raw_super->section_count);
 885         sbi->total_node_count =
 886                 (le32_to_cpu(raw_super->segment_count_nat) / 2)
 887                         * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
 888         sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
 889         sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
 890         sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
 891         sbi->cur_victim_sec = NULL_SECNO;
 892         sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
 893
 894         for (i = 0; i < NR_COUNT_TYPE; i++)
 895                 atomic_set(&sbi->nr_pages[i], 0);
 896
 897         sbi->dir_level = DEF_DIR_LEVEL;
 898         sbi->need_fsck = false;
 899 }
 900
 901 /*
 902  * Read f2fs raw super block.
 903  * Because we have two copies of super block, so read the first one at first,
 904  * if the first one is invalid, move to read the second one.
 905  */
 906 static int read_raw_super_block(struct super_block *sb,
 907                         struct f2fs_super_block **raw_super,
 908                         struct buffer_head **raw_super_buf)
 909 {
 910         int block = 0;
 911
 912 retry:
 913         *raw_super_buf = sb_bread(sb, block);
 914         if (!*raw_super_buf) {
 915                 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
 916                                 block + 1);
 917                 if (block == 0) {
 918                         block++;
 919                         goto retry;
 920                 } else {
 921                         return -EIO;
 922                 }
 923         }
 924
 925         *raw_super = (struct f2fs_super_block *)
 926                 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
 927
 928         /* sanity checking of raw super */
 929         if (sanity_check_raw_super(sb, *raw_super)) {
 930                 brelse(*raw_super_buf);
 931                 f2fs_msg(sb, KERN_ERR,
 932                         "Can't find valid F2FS filesystem in %dth superblock",
 933                                                                 block + 1);
 934                 if (block == 0) {
 935                         block++;
 936                         goto retry;
 937                 } else {
 938                         return -EINVAL;
 939                 }
 940         }
 941
 942         return 0;
 943 }
 944
 945 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 946 {
 947         struct f2fs_sb_info *sbi;
 948         struct f2fs_super_block *raw_super = NULL;
 949         struct buffer_head *raw_super_buf;
 950         struct inode *root;
 951         long err = -EINVAL;
 952         bool retry = true;
 953         int i;
 954
 955 try_onemore:
 956         /* allocate memory for f2fs-specific super block info */
 957         sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
 958         if (!sbi)
 959                 return -ENOMEM;
 960
 961         /* set a block size */
 962         if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
 963                 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
 964                 goto free_sbi;
 965         }
 966
 967         err = read_raw_super_block(sb, &raw_super, &raw_super_buf);
 968         if (err)
 969                 goto free_sbi;
 970
 971         sb->s_fs_info = sbi;
 972         /* init some FS parameters */
 973         sbi->active_logs = NR_CURSEG_TYPE;
 974
 975         set_opt(sbi, BG_GC);
 976
 977 #ifdef CONFIG_F2FS_FS_XATTR
 978         set_opt(sbi, XATTR_USER);
 979 #endif
 980 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 981         set_opt(sbi, POSIX_ACL);
 982 #endif
 983         /* parse mount options */
 984         err = parse_options(sb, (char *)data);
 985         if (err)
 986                 goto free_sb_buf;
 987
 988         sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
 989         sb->s_max_links = F2FS_LINK_MAX;
 990         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
 991
 992         sb->s_op = &f2fs_sops;
 993         sb->s_xattr = f2fs_xattr_handlers;
 994         sb->s_export_op = &f2fs_export_ops;
 995         sb->s_magic = F2FS_SUPER_MAGIC;
 996         sb->s_time_gran = 1;
 997         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 998                 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
 999         memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
1000
1001         /* init f2fs-specific super block info */
1002         sbi->sb = sb;
1003         sbi->raw_super = raw_super;
1004         sbi->raw_super_buf = raw_super_buf;
1005         mutex_init(&sbi->gc_mutex);
1006         mutex_init(&sbi->writepages);
1007         mutex_init(&sbi->cp_mutex);
1008         init_rwsem(&sbi->node_write);
1009         sbi->por_doing = false;
1010         spin_lock_init(&sbi->stat_lock);
1011
1012         init_rwsem(&sbi->read_io.io_rwsem);
1013         sbi->read_io.sbi = sbi;
1014         sbi->read_io.bio = NULL;
1015         for (i = 0; i < NR_PAGE_TYPE; i++) {
1016                 init_rwsem(&sbi->write_io[i].io_rwsem);
1017                 sbi->write_io[i].sbi = sbi;
1018                 sbi->write_io[i].bio = NULL;
1019         }
1020
1021         init_rwsem(&sbi->cp_rwsem);
1022         init_waitqueue_head(&sbi->cp_wait);
1023         init_sb_info(sbi);
1024
1025         /* get an inode for meta space */
1026         sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
1027         if (IS_ERR(sbi->meta_inode)) {
1028                 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
1029                 err = PTR_ERR(sbi->meta_inode);
1030                 goto free_sb_buf;
1031         }
1032
1033         err = get_valid_checkpoint(sbi);
1034         if (err) {
1035                 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
1036                 goto free_meta_inode;
1037         }
1038
1039         /* sanity checking of checkpoint */
1040         err = -EINVAL;
1041         if (sanity_check_ckpt(sbi)) {
1042                 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
1043                 goto free_cp;
1044         }
1045
1046         sbi->total_valid_node_count =
1047                                 le32_to_cpu(sbi->ckpt->valid_node_count);
1048         sbi->total_valid_inode_count =
1049                                 le32_to_cpu(sbi->ckpt->valid_inode_count);
1050         sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
1051         sbi->total_valid_block_count =
1052                                 le64_to_cpu(sbi->ckpt->valid_block_count);
1053         sbi->last_valid_block_count = sbi->total_valid_block_count;
1054         sbi->alloc_valid_block_count = 0;
1055         INIT_LIST_HEAD(&sbi->dir_inode_list);
1056         spin_lock_init(&sbi->dir_inode_lock);
1057
1058         init_ino_entry_info(sbi);
1059
1060         /* setup f2fs internal modules */
1061         err = build_segment_manager(sbi);
1062         if (err) {
1063                 f2fs_msg(sb, KERN_ERR,
1064                         "Failed to initialize F2FS segment manager");
1065                 goto free_sm;
1066         }
1067         err = build_node_manager(sbi);
1068         if (err) {
1069                 f2fs_msg(sb, KERN_ERR,
1070                         "Failed to initialize F2FS node manager");
1071                 goto free_nm;
1072         }
1073
1074         build_gc_manager(sbi);
1075
1076         /* get an inode for node space */
1077         sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
1078         if (IS_ERR(sbi->node_inode)) {
1079                 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
1080                 err = PTR_ERR(sbi->node_inode);
1081                 goto free_nm;
1082         }
1083
1084         /* if there are nt orphan nodes free them */
1085         recover_orphan_inodes(sbi);
1086
1087         /* read root inode and dentry */
1088         root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
1089         if (IS_ERR(root)) {
1090                 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
1091                 err = PTR_ERR(root);
1092                 goto free_node_inode;
1093         }
1094         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1095                 iput(root);
1096                 err = -EINVAL;
1097                 goto free_node_inode;
1098         }
1099
1100         sb->s_root = d_make_root(root); /* allocate root dentry */
1101         if (!sb->s_root) {
1102                 err = -ENOMEM;
1103                 goto free_root_inode;
1104         }
1105
1106         err = f2fs_build_stats(sbi);
1107         if (err)
1108                 goto free_root_inode;
1109
1110         if (f2fs_proc_root)
1111                 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
1112
1113         if (sbi->s_proc)
1114                 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
1115                                  &f2fs_seq_segment_info_fops, sb);
1116
1117         if (test_opt(sbi, DISCARD)) {
1118                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1119                 if (!blk_queue_discard(q))
1120                         f2fs_msg(sb, KERN_WARNING,
1121                                         "mounting with \"discard\" option, but "
1122                                         "the device does not support discard");
1123         }
1124
1125         sbi->s_kobj.kset = f2fs_kset;
1126         init_completion(&sbi->s_kobj_unregister);
1127         err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1128                                                         "%s", sb->s_id);
1129         if (err)
1130                 goto free_proc;
1131
1132         if (!retry)
1133                 sbi->need_fsck = true;
1134
1135         /* recover fsynced data */
1136         if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1137                 err = recover_fsync_data(sbi);
1138                 if (err) {
1139                         f2fs_msg(sb, KERN_ERR,
1140                                 "Cannot recover all fsync data errno=%ld", err);
1141                         goto free_kobj;
1142                 }
1143         }
1144
1145         /*
1146          * If filesystem is not mounted as read-only then
1147          * do start the gc_thread.
1148          */
1149         if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) {
1150                 /* After POR, we can run background GC thread.*/
1151                 err = start_gc_thread(sbi);
1152                 if (err)
1153                         goto free_kobj;
1154         }
1155         return 0;
1156
1157 free_kobj:
1158         kobject_del(&sbi->s_kobj);
1159 free_proc:
1160         if (sbi->s_proc) {
1161                 remove_proc_entry("segment_info", sbi->s_proc);
1162                 remove_proc_entry(sb->s_id, f2fs_proc_root);
1163         }
1164         f2fs_destroy_stats(sbi);
1165 free_root_inode:
1166         dput(sb->s_root);
1167         sb->s_root = NULL;
1168 free_node_inode:
1169         iput(sbi->node_inode);
1170 free_nm:
1171         destroy_node_manager(sbi);
1172 free_sm:
1173         destroy_segment_manager(sbi);
1174 free_cp:
1175         kfree(sbi->ckpt);
1176 free_meta_inode:
1177         make_bad_inode(sbi->meta_inode);
1178         iput(sbi->meta_inode);
1179 free_sb_buf:
1180         brelse(raw_super_buf);
1181 free_sbi:
1182         kfree(sbi);
1183
1184         /* give only one another chance */
1185         if (retry) {
1186                 retry = 0;
1187                 shrink_dcache_sb(sb);
1188                 goto try_onemore;
1189         }
1190         return err;
1191 }
1192
1193 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
1194                         const char *dev_name, void *data)
1195 {
1196         return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
1197 }
1198
1199 static void kill_f2fs_super(struct super_block *sb)
1200 {
1201         if (sb->s_root)
1202                 F2FS_SB(sb)->s_closing = true;
1203         kill_block_super(sb);
1204 }
1205
1206 static struct file_system_type f2fs_fs_type = {
1207         .owner          = THIS_MODULE,
1208         .name           = "f2fs",
1209         .mount          = f2fs_mount,
1210         .kill_sb        = kill_f2fs_super,
1211         .fs_flags       = FS_REQUIRES_DEV,
1212 };
1213 MODULE_ALIAS_FS("f2fs");
1214
1215 static int __init init_inodecache(void)
1216 {
1217         f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
1218                         sizeof(struct f2fs_inode_info));
1219         if (!f2fs_inode_cachep)
1220                 return -ENOMEM;
1221         return 0;
1222 }
1223
1224 static void destroy_inodecache(void)
1225 {
1226         /*
1227          * Make sure all delayed rcu free inodes are flushed before we
1228          * destroy cache.
1229          */
1230         rcu_barrier();
1231         kmem_cache_destroy(f2fs_inode_cachep);
1232 }
1233
1234 static int __init init_f2fs_fs(void)
1235 {
1236         int err;
1237
1238         f2fs_build_trace_ios();
1239
1240         err = init_inodecache();
1241         if (err)
1242                 goto fail;
1243         err = create_node_manager_caches();
1244         if (err)
1245                 goto free_inodecache;
1246         err = create_segment_manager_caches();
1247         if (err)
1248                 goto free_node_manager_caches;
1249         err = create_checkpoint_caches();
1250         if (err)
1251                 goto free_segment_manager_caches;
1252         f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
1253         if (!f2fs_kset) {
1254                 err = -ENOMEM;
1255                 goto free_checkpoint_caches;
1256         }
1257         err = register_filesystem(&f2fs_fs_type);
1258         if (err)
1259                 goto free_kset;
1260         f2fs_create_root_stats();
1261         f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1262         return 0;
1263
1264 free_kset:
1265         kset_unregister(f2fs_kset);
1266 free_checkpoint_caches:
1267         destroy_checkpoint_caches();
1268 free_segment_manager_caches:
1269         destroy_segment_manager_caches();
1270 free_node_manager_caches:
1271         destroy_node_manager_caches();
1272 free_inodecache:
1273         destroy_inodecache();
1274 fail:
1275         return err;
1276 }
1277
1278 static void __exit exit_f2fs_fs(void)
1279 {
1280         remove_proc_entry("fs/f2fs", NULL);
1281         f2fs_destroy_root_stats();
1282         unregister_filesystem(&f2fs_fs_type);
1283         destroy_checkpoint_caches();
1284         destroy_segment_manager_caches();
1285         destroy_node_manager_caches();
1286         destroy_inodecache();
1287         kset_unregister(f2fs_kset);
1288         f2fs_destroy_trace_ios();
1289 }
1290
1291 module_init(init_f2fs_fs)
1292 module_exit(exit_f2fs_fs)
1293
1294 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1295 MODULE_DESCRIPTION("Flash Friendly File System");
1296 MODULE_LICENSE("GPL");