fs/f2fs/super.c

   1 /*
   2  * fs/f2fs/super.c
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *             http://www.samsung.com/
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/fs.h>
  14 #include <linux/statfs.h>
  15 #include <linux/buffer_head.h>
  16 #include <linux/backing-dev.h>
  17 #include <linux/kthread.h>
  18 #include <linux/parser.h>
  19 #include <linux/mount.h>
  20 #include <linux/seq_file.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/random.h>
  23 #include <linux/exportfs.h>
  24 #include <linux/blkdev.h>
  25 #include <linux/f2fs_fs.h>
  26 #include <linux/sysfs.h>
  27
  28 #include "f2fs.h"
  29 #include "node.h"
  30 #include "segment.h"
  31 #include "xattr.h"
  32 #include "gc.h"
  33 #include "trace.h"
  34
  35 #define CREATE_TRACE_POINTS
  36 #include <trace/events/f2fs.h>
  37
  38 static struct proc_dir_entry *f2fs_proc_root;
  39 static struct kmem_cache *f2fs_inode_cachep;
  40 static struct kset *f2fs_kset;
  41
  42 enum {
  43         Opt_gc_background,
  44         Opt_disable_roll_forward,
  45         Opt_norecovery,
  46         Opt_discard,
  47         Opt_noheap,
  48         Opt_user_xattr,
  49         Opt_nouser_xattr,
  50         Opt_acl,
  51         Opt_noacl,
  52         Opt_active_logs,
  53         Opt_disable_ext_identify,
  54         Opt_inline_xattr,
  55         Opt_inline_data,
  56         Opt_inline_dentry,
  57         Opt_flush_merge,
  58         Opt_nobarrier,
  59         Opt_fastboot,
  60         Opt_extent_cache,
  61         Opt_err,
  62 };
  63
  64 static match_table_t f2fs_tokens = {
  65         {Opt_gc_background, "background_gc=%s"},
  66         {Opt_disable_roll_forward, "disable_roll_forward"},
  67         {Opt_norecovery, "norecovery"},
  68         {Opt_discard, "discard"},
  69         {Opt_noheap, "no_heap"},
  70         {Opt_user_xattr, "user_xattr"},
  71         {Opt_nouser_xattr, "nouser_xattr"},
  72         {Opt_acl, "acl"},
  73         {Opt_noacl, "noacl"},
  74         {Opt_active_logs, "active_logs=%u"},
  75         {Opt_disable_ext_identify, "disable_ext_identify"},
  76         {Opt_inline_xattr, "inline_xattr"},
  77         {Opt_inline_data, "inline_data"},
  78         {Opt_inline_dentry, "inline_dentry"},
  79         {Opt_flush_merge, "flush_merge"},
  80         {Opt_nobarrier, "nobarrier"},
  81         {Opt_fastboot, "fastboot"},
  82         {Opt_extent_cache, "extent_cache"},
  83         {Opt_err, NULL},
  84 };
  85
  86 /* Sysfs support for f2fs */
  87 enum {
  88         GC_THREAD,      /* struct f2fs_gc_thread */
  89         SM_INFO,        /* struct f2fs_sm_info */
  90         NM_INFO,        /* struct f2fs_nm_info */
  91         F2FS_SBI,       /* struct f2fs_sb_info */
  92 };
  93
  94 struct f2fs_attr {
  95         struct attribute attr;
  96         ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
  97         ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
  98                          const char *, size_t);
  99         int struct_type;
 100         int offset;
 101 };
 102
 103 static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
 104 {
 105         if (struct_type == GC_THREAD)
 106                 return (unsigned char *)sbi->gc_thread;
 107         else if (struct_type == SM_INFO)
 108                 return (unsigned char *)SM_I(sbi);
 109         else if (struct_type == NM_INFO)
 110                 return (unsigned char *)NM_I(sbi);
 111         else if (struct_type == F2FS_SBI)
 112                 return (unsigned char *)sbi;
 113         return NULL;
 114 }
 115
 116 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
 117                         struct f2fs_sb_info *sbi, char *buf)
 118 {
 119         unsigned char *ptr = NULL;
 120         unsigned int *ui;
 121
 122         ptr = __struct_ptr(sbi, a->struct_type);
 123         if (!ptr)
 124                 return -EINVAL;
 125
 126         ui = (unsigned int *)(ptr + a->offset);
 127
 128         return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
 129 }
 130
 131 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
 132                         struct f2fs_sb_info *sbi,
 133                         const char *buf, size_t count)
 134 {
 135         unsigned char *ptr;
 136         unsigned long t;
 137         unsigned int *ui;
 138         ssize_t ret;
 139
 140         ptr = __struct_ptr(sbi, a->struct_type);
 141         if (!ptr)
 142                 return -EINVAL;
 143
 144         ui = (unsigned int *)(ptr + a->offset);
 145
 146         ret = kstrtoul(skip_spaces(buf), 0, &t);
 147         if (ret < 0)
 148                 return ret;
 149         *ui = t;
 150         return count;
 151 }
 152
 153 static ssize_t f2fs_attr_show(struct kobject *kobj,
 154                                 struct attribute *attr, char *buf)
 155 {
 156         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 157                                                                 s_kobj);
 158         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 159
 160         return a->show ? a->show(a, sbi, buf) : 0;
 161 }
 162
 163 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
 164                                                 const char *buf, size_t len)
 165 {
 166         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 167                                                                         s_kobj);
 168         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 169
 170         return a->store ? a->store(a, sbi, buf, len) : 0;
 171 }
 172
 173 static void f2fs_sb_release(struct kobject *kobj)
 174 {
 175         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 176                                                                 s_kobj);
 177         complete(&sbi->s_kobj_unregister);
 178 }
 179
 180 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
 181 static struct f2fs_attr f2fs_attr_##_name = {                   \
 182         .attr = {.name = __stringify(_name), .mode = _mode },   \
 183         .show   = _show,                                        \
 184         .store  = _store,                                       \
 185         .struct_type = _struct_type,                            \
 186         .offset = _offset                                       \
 187 }
 188
 189 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname)    \
 190         F2FS_ATTR_OFFSET(struct_type, name, 0644,               \
 191                 f2fs_sbi_show, f2fs_sbi_store,                  \
 192                 offsetof(struct struct_name, elname))
 193
 194 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
 195 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
 196 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
 197 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
 198 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
 199 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
 200 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
 201 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
 202 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
 203 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
 204 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
 205 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
 206 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
 207
 208 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
 209 static struct attribute *f2fs_attrs[] = {
 210         ATTR_LIST(gc_min_sleep_time),
 211         ATTR_LIST(gc_max_sleep_time),
 212         ATTR_LIST(gc_no_gc_sleep_time),
 213         ATTR_LIST(gc_idle),
 214         ATTR_LIST(reclaim_segments),
 215         ATTR_LIST(max_small_discards),
 216         ATTR_LIST(batched_trim_sections),
 217         ATTR_LIST(ipu_policy),
 218         ATTR_LIST(min_ipu_util),
 219         ATTR_LIST(min_fsync_blocks),
 220         ATTR_LIST(max_victim_search),
 221         ATTR_LIST(dir_level),
 222         ATTR_LIST(ram_thresh),
 223         NULL,
 224 };
 225
 226 static const struct sysfs_ops f2fs_attr_ops = {
 227         .show   = f2fs_attr_show,
 228         .store  = f2fs_attr_store,
 229 };
 230
 231 static struct kobj_type f2fs_ktype = {
 232         .default_attrs  = f2fs_attrs,
 233         .sysfs_ops      = &f2fs_attr_ops,
 234         .release        = f2fs_sb_release,
 235 };
 236
 237 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
 238 {
 239         struct va_format vaf;
 240         va_list args;
 241
 242         va_start(args, fmt);
 243         vaf.fmt = fmt;
 244         vaf.va = &args;
 245         printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
 246         va_end(args);
 247 }
 248
 249 static void init_once(void *foo)
 250 {
 251         struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
 252
 253         inode_init_once(&fi->vfs_inode);
 254 }
 255
 256 static int parse_options(struct super_block *sb, char *options)
 257 {
 258         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 259         substring_t args[MAX_OPT_ARGS];
 260         char *p, *name;
 261         int arg = 0;
 262
 263         if (!options)
 264                 return 0;
 265
 266         while ((p = strsep(&options, ",")) != NULL) {
 267                 int token;
 268                 if (!*p)
 269                         continue;
 270                 /*
 271                  * Initialize args struct so we know whether arg was
 272                  * found; some options take optional arguments.
 273                  */
 274                 args[0].to = args[0].from = NULL;
 275                 token = match_token(p, f2fs_tokens, args);
 276
 277                 switch (token) {
 278                 case Opt_gc_background:
 279                         name = match_strdup(&args[0]);
 280
 281                         if (!name)
 282                                 return -ENOMEM;
 283                         if (strlen(name) == 2 && !strncmp(name, "on", 2))
 284                                 set_opt(sbi, BG_GC);
 285                         else if (strlen(name) == 3 && !strncmp(name, "off", 3))
 286                                 clear_opt(sbi, BG_GC);
 287                         else {
 288                                 kfree(name);
 289                                 return -EINVAL;
 290                         }
 291                         kfree(name);
 292                         break;
 293                 case Opt_disable_roll_forward:
 294                         set_opt(sbi, DISABLE_ROLL_FORWARD);
 295                         break;
 296                 case Opt_norecovery:
 297                         /* this option mounts f2fs with ro */
 298                         set_opt(sbi, DISABLE_ROLL_FORWARD);
 299                         if (!f2fs_readonly(sb))
 300                                 return -EINVAL;
 301                         break;
 302                 case Opt_discard:
 303                         set_opt(sbi, DISCARD);
 304                         break;
 305                 case Opt_noheap:
 306                         set_opt(sbi, NOHEAP);
 307                         break;
 308 #ifdef CONFIG_F2FS_FS_XATTR
 309                 case Opt_user_xattr:
 310                         set_opt(sbi, XATTR_USER);
 311                         break;
 312                 case Opt_nouser_xattr:
 313                         clear_opt(sbi, XATTR_USER);
 314                         break;
 315                 case Opt_inline_xattr:
 316                         set_opt(sbi, INLINE_XATTR);
 317                         break;
 318 #else
 319                 case Opt_user_xattr:
 320                         f2fs_msg(sb, KERN_INFO,
 321                                 "user_xattr options not supported");
 322                         break;
 323                 case Opt_nouser_xattr:
 324                         f2fs_msg(sb, KERN_INFO,
 325                                 "nouser_xattr options not supported");
 326                         break;
 327                 case Opt_inline_xattr:
 328                         f2fs_msg(sb, KERN_INFO,
 329                                 "inline_xattr options not supported");
 330                         break;
 331 #endif
 332 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 333                 case Opt_acl:
 334                         set_opt(sbi, POSIX_ACL);
 335                         break;
 336                 case Opt_noacl:
 337                         clear_opt(sbi, POSIX_ACL);
 338                         break;
 339 #else
 340                 case Opt_acl:
 341                         f2fs_msg(sb, KERN_INFO, "acl options not supported");
 342                         break;
 343                 case Opt_noacl:
 344                         f2fs_msg(sb, KERN_INFO, "noacl options not supported");
 345                         break;
 346 #endif
 347                 case Opt_active_logs:
 348                         if (args->from && match_int(args, &arg))
 349                                 return -EINVAL;
 350                         if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
 351                                 return -EINVAL;
 352                         sbi->active_logs = arg;
 353                         break;
 354                 case Opt_disable_ext_identify:
 355                         set_opt(sbi, DISABLE_EXT_IDENTIFY);
 356                         break;
 357                 case Opt_inline_data:
 358                         set_opt(sbi, INLINE_DATA);
 359                         break;
 360                 case Opt_inline_dentry:
 361                         set_opt(sbi, INLINE_DENTRY);
 362                         break;
 363                 case Opt_flush_merge:
 364                         set_opt(sbi, FLUSH_MERGE);
 365                         break;
 366                 case Opt_nobarrier:
 367                         set_opt(sbi, NOBARRIER);
 368                         break;
 369                 case Opt_fastboot:
 370                         set_opt(sbi, FASTBOOT);
 371                         break;
 372                 case Opt_extent_cache:
 373                         set_opt(sbi, EXTENT_CACHE);
 374                         break;
 375                 default:
 376                         f2fs_msg(sb, KERN_ERR,
 377                                 "Unrecognized mount option \"%s\" or missing value",
 378                                 p);
 379                         return -EINVAL;
 380                 }
 381         }
 382         return 0;
 383 }
 384
 385 static struct inode *f2fs_alloc_inode(struct super_block *sb)
 386 {
 387         struct f2fs_inode_info *fi;
 388
 389         fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
 390         if (!fi)
 391                 return NULL;
 392
 393         init_once((void *) fi);
 394
 395         /* Initialize f2fs-specific inode info */
 396         fi->vfs_inode.i_version = 1;
 397         atomic_set(&fi->dirty_pages, 0);
 398         fi->i_current_depth = 1;
 399         fi->i_advise = 0;
 400         rwlock_init(&fi->ext_lock);
 401         init_rwsem(&fi->i_sem);
 402         INIT_RADIX_TREE(&fi->inmem_root, GFP_NOFS);
 403         INIT_LIST_HEAD(&fi->inmem_pages);
 404         mutex_init(&fi->inmem_lock);
 405
 406         set_inode_flag(fi, FI_NEW_INODE);
 407
 408         if (test_opt(F2FS_SB(sb), INLINE_XATTR))
 409                 set_inode_flag(fi, FI_INLINE_XATTR);
 410
 411         /* Will be used by directory only */
 412         fi->i_dir_level = F2FS_SB(sb)->dir_level;
 413
 414         return &fi->vfs_inode;
 415 }
 416
 417 static int f2fs_drop_inode(struct inode *inode)
 418 {
 419         /*
 420          * This is to avoid a deadlock condition like below.
 421          * writeback_single_inode(inode)
 422          *  - f2fs_write_data_page
 423          *    - f2fs_gc -> iput -> evict
 424          *       - inode_wait_for_writeback(inode)
 425          */
 426         if (!inode_unhashed(inode) && inode->i_state & I_SYNC)
 427                 return 0;
 428         return generic_drop_inode(inode);
 429 }
 430
 431 /*
 432  * f2fs_dirty_inode() is called from __mark_inode_dirty()
 433  *
 434  * We should call set_dirty_inode to write the dirty inode through write_inode.
 435  */
 436 static void f2fs_dirty_inode(struct inode *inode, int flags)
 437 {
 438         set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
 439 }
 440
 441 static void f2fs_i_callback(struct rcu_head *head)
 442 {
 443         struct inode *inode = container_of(head, struct inode, i_rcu);
 444         kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
 445 }
 446
 447 static void f2fs_destroy_inode(struct inode *inode)
 448 {
 449         call_rcu(&inode->i_rcu, f2fs_i_callback);
 450 }
 451
 452 static void f2fs_put_super(struct super_block *sb)
 453 {
 454         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 455
 456         if (sbi->s_proc) {
 457                 remove_proc_entry("segment_info", sbi->s_proc);
 458                 remove_proc_entry(sb->s_id, f2fs_proc_root);
 459         }
 460         kobject_del(&sbi->s_kobj);
 461
 462         f2fs_destroy_stats(sbi);
 463         stop_gc_thread(sbi);
 464
 465         /*
 466          * We don't need to do checkpoint when superblock is clean.
 467          * But, the previous checkpoint was not done by umount, it needs to do
 468          * clean checkpoint again.
 469          */
 470         if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
 471                         !is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) {
 472                 struct cp_control cpc = {
 473                         .reason = CP_UMOUNT,
 474                 };
 475                 write_checkpoint(sbi, &cpc);
 476         }
 477
 478         /*
 479          * normally superblock is clean, so we need to release this.
 480          * In addition, EIO will skip do checkpoint, we need this as well.
 481          */
 482         release_dirty_inode(sbi);
 483         release_discard_addrs(sbi);
 484
 485         iput(sbi->node_inode);
 486         iput(sbi->meta_inode);
 487
 488         /* destroy f2fs internal modules */
 489         destroy_node_manager(sbi);
 490         destroy_segment_manager(sbi);
 491
 492         kfree(sbi->ckpt);
 493         kobject_put(&sbi->s_kobj);
 494         wait_for_completion(&sbi->s_kobj_unregister);
 495
 496         sb->s_fs_info = NULL;
 497         brelse(sbi->raw_super_buf);
 498         kfree(sbi);
 499 }
 500
 501 int f2fs_sync_fs(struct super_block *sb, int sync)
 502 {
 503         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 504
 505         trace_f2fs_sync_fs(sb, sync);
 506
 507         if (sync) {
 508                 struct cp_control cpc;
 509
 510                 cpc.reason = __get_cp_reason(sbi);
 511
 512                 mutex_lock(&sbi->gc_mutex);
 513                 write_checkpoint(sbi, &cpc);
 514                 mutex_unlock(&sbi->gc_mutex);
 515         } else {
 516                 f2fs_balance_fs(sbi);
 517         }
 518         f2fs_trace_ios(NULL, NULL, 1);
 519
 520         return 0;
 521 }
 522
 523 static int f2fs_freeze(struct super_block *sb)
 524 {
 525         int err;
 526
 527         if (f2fs_readonly(sb))
 528                 return 0;
 529
 530         err = f2fs_sync_fs(sb, 1);
 531         return err;
 532 }
 533
 534 static int f2fs_unfreeze(struct super_block *sb)
 535 {
 536         return 0;
 537 }
 538
 539 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
 540 {
 541         struct super_block *sb = dentry->d_sb;
 542         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 543         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 544         block_t total_count, user_block_count, start_count, ovp_count;
 545
 546         total_count = le64_to_cpu(sbi->raw_super->block_count);
 547         user_block_count = sbi->user_block_count;
 548         start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
 549         ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
 550         buf->f_type = F2FS_SUPER_MAGIC;
 551         buf->f_bsize = sbi->blocksize;
 552
 553         buf->f_blocks = total_count - start_count;
 554         buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
 555         buf->f_bavail = user_block_count - valid_user_blocks(sbi);
 556
 557         buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
 558         buf->f_ffree = buf->f_files - valid_inode_count(sbi);
 559
 560         buf->f_namelen = F2FS_NAME_LEN;
 561         buf->f_fsid.val[0] = (u32)id;
 562         buf->f_fsid.val[1] = (u32)(id >> 32);
 563
 564         return 0;
 565 }
 566
 567 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
 568 {
 569         struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
 570
 571         if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC))
 572                 seq_printf(seq, ",background_gc=%s", "on");
 573         else
 574                 seq_printf(seq, ",background_gc=%s", "off");
 575         if (test_opt(sbi, DISABLE_ROLL_FORWARD))
 576                 seq_puts(seq, ",disable_roll_forward");
 577         if (test_opt(sbi, DISCARD))
 578                 seq_puts(seq, ",discard");
 579         if (test_opt(sbi, NOHEAP))
 580                 seq_puts(seq, ",no_heap_alloc");
 581 #ifdef CONFIG_F2FS_FS_XATTR
 582         if (test_opt(sbi, XATTR_USER))
 583                 seq_puts(seq, ",user_xattr");
 584         else
 585                 seq_puts(seq, ",nouser_xattr");
 586         if (test_opt(sbi, INLINE_XATTR))
 587                 seq_puts(seq, ",inline_xattr");
 588 #endif
 589 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 590         if (test_opt(sbi, POSIX_ACL))
 591                 seq_puts(seq, ",acl");
 592         else
 593                 seq_puts(seq, ",noacl");
 594 #endif
 595         if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
 596                 seq_puts(seq, ",disable_ext_identify");
 597         if (test_opt(sbi, INLINE_DATA))
 598                 seq_puts(seq, ",inline_data");
 599         if (test_opt(sbi, INLINE_DENTRY))
 600                 seq_puts(seq, ",inline_dentry");
 601         if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
 602                 seq_puts(seq, ",flush_merge");
 603         if (test_opt(sbi, NOBARRIER))
 604                 seq_puts(seq, ",nobarrier");
 605         if (test_opt(sbi, FASTBOOT))
 606                 seq_puts(seq, ",fastboot");
 607         if (test_opt(sbi, EXTENT_CACHE))
 608                 seq_puts(seq, ",extent_cache");
 609         seq_printf(seq, ",active_logs=%u", sbi->active_logs);
 610
 611         return 0;
 612 }
 613
 614 static int segment_info_seq_show(struct seq_file *seq, void *offset)
 615 {
 616         struct super_block *sb = seq->private;
 617         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 618         unsigned int total_segs =
 619                         le32_to_cpu(sbi->raw_super->segment_count_main);
 620         int i;
 621
 622         seq_puts(seq, "format: segment_type|valid_blocks\n"
 623                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
 624
 625         for (i = 0; i < total_segs; i++) {
 626                 struct seg_entry *se = get_seg_entry(sbi, i);
 627
 628                 if ((i % 10) == 0)
 629                         seq_printf(seq, "%-5d", i);
 630                 seq_printf(seq, "%d|%-3u", se->type,
 631                                         get_valid_blocks(sbi, i, 1));
 632                 if ((i % 10) == 9 || i == (total_segs - 1))
 633                         seq_putc(seq, '\n');
 634                 else
 635                         seq_putc(seq, ' ');
 636         }
 637
 638         return 0;
 639 }
 640
 641 static int segment_info_open_fs(struct inode *inode, struct file *file)
 642 {
 643         return single_open(file, segment_info_seq_show, PDE_DATA(inode));
 644 }
 645
 646 static const struct file_operations f2fs_seq_segment_info_fops = {
 647         .owner = THIS_MODULE,
 648         .open = segment_info_open_fs,
 649         .read = seq_read,
 650         .llseek = seq_lseek,
 651         .release = single_release,
 652 };
 653
 654 static int f2fs_remount(struct super_block *sb, int *flags, char *data)
 655 {
 656         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 657         struct f2fs_mount_info org_mount_opt;
 658         int err, active_logs;
 659         bool need_restart_gc = false;
 660         bool need_stop_gc = false;
 661
 662         sync_filesystem(sb);
 663
 664         /*
 665          * Save the old mount options in case we
 666          * need to restore them.
 667          */
 668         org_mount_opt = sbi->mount_opt;
 669         active_logs = sbi->active_logs;
 670
 671         sbi->mount_opt.opt = 0;
 672         sbi->active_logs = NR_CURSEG_TYPE;
 673
 674         /* parse mount options */
 675         err = parse_options(sb, data);
 676         if (err)
 677                 goto restore_opts;
 678
 679         /*
 680          * Previous and new state of filesystem is RO,
 681          * so skip checking GC and FLUSH_MERGE conditions.
 682          */
 683         if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
 684                 goto skip;
 685
 686         /*
 687          * We stop the GC thread if FS is mounted as RO
 688          * or if background_gc = off is passed in mount
 689          * option. Also sync the filesystem.
 690          */
 691         if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
 692                 if (sbi->gc_thread) {
 693                         stop_gc_thread(sbi);
 694                         f2fs_sync_fs(sb, 1);
 695                         need_restart_gc = true;
 696                 }
 697         } else if (!sbi->gc_thread) {
 698                 err = start_gc_thread(sbi);
 699                 if (err)
 700                         goto restore_opts;
 701                 need_stop_gc = true;
 702         }
 703
 704         /*
 705          * We stop issue flush thread if FS is mounted as RO
 706          * or if flush_merge is not passed in mount option.
 707          */
 708         if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
 709                 destroy_flush_cmd_control(sbi);
 710         } else if (!SM_I(sbi)->cmd_control_info) {
 711                 err = create_flush_cmd_control(sbi);
 712                 if (err)
 713                         goto restore_gc;
 714         }
 715 skip:
 716         /* Update the POSIXACL Flag */
 717          sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 718                 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
 719         return 0;
 720 restore_gc:
 721         if (need_restart_gc) {
 722                 if (start_gc_thread(sbi))
 723                         f2fs_msg(sbi->sb, KERN_WARNING,
 724                                 "background gc thread has stopped");
 725         } else if (need_stop_gc) {
 726                 stop_gc_thread(sbi);
 727         }
 728 restore_opts:
 729         sbi->mount_opt = org_mount_opt;
 730         sbi->active_logs = active_logs;
 731         return err;
 732 }
 733
 734 static struct super_operations f2fs_sops = {
 735         .alloc_inode    = f2fs_alloc_inode,
 736         .drop_inode     = f2fs_drop_inode,
 737         .destroy_inode  = f2fs_destroy_inode,
 738         .write_inode    = f2fs_write_inode,
 739         .dirty_inode    = f2fs_dirty_inode,
 740         .show_options   = f2fs_show_options,
 741         .evict_inode    = f2fs_evict_inode,
 742         .put_super      = f2fs_put_super,
 743         .sync_fs        = f2fs_sync_fs,
 744         .freeze_fs      = f2fs_freeze,
 745         .unfreeze_fs    = f2fs_unfreeze,
 746         .statfs         = f2fs_statfs,
 747         .remount_fs     = f2fs_remount,
 748 };
 749
 750 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
 751                 u64 ino, u32 generation)
 752 {
 753         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 754         struct inode *inode;
 755
 756         if (check_nid_range(sbi, ino))
 757                 return ERR_PTR(-ESTALE);
 758
 759         /*
 760          * f2fs_iget isn't quite right if the inode is currently unallocated!
 761          * However f2fs_iget currently does appropriate checks to handle stale
 762          * inodes so everything is OK.
 763          */
 764         inode = f2fs_iget(sb, ino);
 765         if (IS_ERR(inode))
 766                 return ERR_CAST(inode);
 767         if (unlikely(generation && inode->i_generation != generation)) {
 768                 /* we didn't find the right inode.. */
 769                 iput(inode);
 770                 return ERR_PTR(-ESTALE);
 771         }
 772         return inode;
 773 }
 774
 775 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
 776                 int fh_len, int fh_type)
 777 {
 778         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 779                                     f2fs_nfs_get_inode);
 780 }
 781
 782 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
 783                 int fh_len, int fh_type)
 784 {
 785         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 786                                     f2fs_nfs_get_inode);
 787 }
 788
 789 static const struct export_operations f2fs_export_ops = {
 790         .fh_to_dentry = f2fs_fh_to_dentry,
 791         .fh_to_parent = f2fs_fh_to_parent,
 792         .get_parent = f2fs_get_parent,
 793 };
 794
 795 static loff_t max_file_size(unsigned bits)
 796 {
 797         loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
 798         loff_t leaf_count = ADDRS_PER_BLOCK;
 799
 800         /* two direct node blocks */
 801         result += (leaf_count * 2);
 802
 803         /* two indirect node blocks */
 804         leaf_count *= NIDS_PER_BLOCK;
 805         result += (leaf_count * 2);
 806
 807         /* one double indirect node block */
 808         leaf_count *= NIDS_PER_BLOCK;
 809         result += leaf_count;
 810
 811         result <<= bits;
 812         return result;
 813 }
 814
 815 static int sanity_check_raw_super(struct super_block *sb,
 816                         struct f2fs_super_block *raw_super)
 817 {
 818         unsigned int blocksize;
 819
 820         if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
 821                 f2fs_msg(sb, KERN_INFO,
 822                         "Magic Mismatch, valid(0x%x) - read(0x%x)",
 823                         F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
 824                 return 1;
 825         }
 826
 827         /* Currently, support only 4KB page cache size */
 828         if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
 829                 f2fs_msg(sb, KERN_INFO,
 830                         "Invalid page_cache_size (%lu), supports only 4KB\n",
 831                         PAGE_CACHE_SIZE);
 832                 return 1;
 833         }
 834
 835         /* Currently, support only 4KB block size */
 836         blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
 837         if (blocksize != F2FS_BLKSIZE) {
 838                 f2fs_msg(sb, KERN_INFO,
 839                         "Invalid blocksize (%u), supports only 4KB\n",
 840                         blocksize);
 841                 return 1;
 842         }
 843
 844         /* Currently, support 512/1024/2048/4096 bytes sector size */
 845         if (le32_to_cpu(raw_super->log_sectorsize) >
 846                                 F2FS_MAX_LOG_SECTOR_SIZE ||
 847                 le32_to_cpu(raw_super->log_sectorsize) <
 848                                 F2FS_MIN_LOG_SECTOR_SIZE) {
 849                 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)",
 850                         le32_to_cpu(raw_super->log_sectorsize));
 851                 return 1;
 852         }
 853         if (le32_to_cpu(raw_super->log_sectors_per_block) +
 854                 le32_to_cpu(raw_super->log_sectorsize) !=
 855                         F2FS_MAX_LOG_SECTOR_SIZE) {
 856                 f2fs_msg(sb, KERN_INFO,
 857                         "Invalid log sectors per block(%u) log sectorsize(%u)",
 858                         le32_to_cpu(raw_super->log_sectors_per_block),
 859                         le32_to_cpu(raw_super->log_sectorsize));
 860                 return 1;
 861         }
 862         return 0;
 863 }
 864
 865 static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
 866 {
 867         unsigned int total, fsmeta;
 868         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
 869         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 870
 871         total = le32_to_cpu(raw_super->segment_count);
 872         fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
 873         fsmeta += le32_to_cpu(raw_super->segment_count_sit);
 874         fsmeta += le32_to_cpu(raw_super->segment_count_nat);
 875         fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
 876         fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
 877
 878         if (unlikely(fsmeta >= total))
 879                 return 1;
 880
 881         if (unlikely(f2fs_cp_error(sbi))) {
 882                 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
 883                 return 1;
 884         }
 885         return 0;
 886 }
 887
 888 static void init_sb_info(struct f2fs_sb_info *sbi)
 889 {
 890         struct f2fs_super_block *raw_super = sbi->raw_super;
 891         int i;
 892
 893         sbi->log_sectors_per_block =
 894                 le32_to_cpu(raw_super->log_sectors_per_block);
 895         sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
 896         sbi->blocksize = 1 << sbi->log_blocksize;
 897         sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
 898         sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
 899         sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
 900         sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
 901         sbi->total_sections = le32_to_cpu(raw_super->section_count);
 902         sbi->total_node_count =
 903                 (le32_to_cpu(raw_super->segment_count_nat) / 2)
 904                         * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
 905         sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
 906         sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
 907         sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
 908         sbi->cur_victim_sec = NULL_SECNO;
 909         sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
 910
 911         for (i = 0; i < NR_COUNT_TYPE; i++)
 912                 atomic_set(&sbi->nr_pages[i], 0);
 913
 914         sbi->dir_level = DEF_DIR_LEVEL;
 915         clear_sbi_flag(sbi, SBI_NEED_FSCK);
 916 }
 917
 918 /*
 919  * Read f2fs raw super block.
 920  * Because we have two copies of super block, so read the first one at first,
 921  * if the first one is invalid, move to read the second one.
 922  */
 923 static int read_raw_super_block(struct super_block *sb,
 924                         struct f2fs_super_block **raw_super,
 925                         struct buffer_head **raw_super_buf)
 926 {
 927         int block = 0;
 928
 929 retry:
 930         *raw_super_buf = sb_bread(sb, block);
 931         if (!*raw_super_buf) {
 932                 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
 933                                 block + 1);
 934                 if (block == 0) {
 935                         block++;
 936                         goto retry;
 937                 } else {
 938                         return -EIO;
 939                 }
 940         }
 941
 942         *raw_super = (struct f2fs_super_block *)
 943                 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
 944
 945         /* sanity checking of raw super */
 946         if (sanity_check_raw_super(sb, *raw_super)) {
 947                 brelse(*raw_super_buf);
 948                 f2fs_msg(sb, KERN_ERR,
 949                         "Can't find valid F2FS filesystem in %dth superblock",
 950                                                                 block + 1);
 951                 if (block == 0) {
 952                         block++;
 953                         goto retry;
 954                 } else {
 955                         return -EINVAL;
 956                 }
 957         }
 958
 959         return 0;
 960 }
 961
 962 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 963 {
 964         struct f2fs_sb_info *sbi;
 965         struct f2fs_super_block *raw_super = NULL;
 966         struct buffer_head *raw_super_buf;
 967         struct inode *root;
 968         long err = -EINVAL;
 969         bool retry = true;
 970         char *options = NULL;
 971         int i;
 972
 973 try_onemore:
 974         /* allocate memory for f2fs-specific super block info */
 975         sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
 976         if (!sbi)
 977                 return -ENOMEM;
 978
 979         /* set a block size */
 980         if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
 981                 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
 982                 goto free_sbi;
 983         }
 984
 985         err = read_raw_super_block(sb, &raw_super, &raw_super_buf);
 986         if (err)
 987                 goto free_sbi;
 988
 989         sb->s_fs_info = sbi;
 990         /* init some FS parameters */
 991         sbi->active_logs = NR_CURSEG_TYPE;
 992
 993         set_opt(sbi, BG_GC);
 994
 995 #ifdef CONFIG_F2FS_FS_XATTR
 996         set_opt(sbi, XATTR_USER);
 997 #endif
 998 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 999         set_opt(sbi, POSIX_ACL);
1000 #endif
1001         /* parse mount options */
1002         options = kstrdup((const char *)data, GFP_KERNEL);
1003         if (data && !options) {
1004                 err = -ENOMEM;
1005                 goto free_sb_buf;
1006         }
1007
1008         err = parse_options(sb, options);
1009         if (err)
1010                 goto free_options;
1011
1012         sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
1013         sb->s_max_links = F2FS_LINK_MAX;
1014         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1015
1016         sb->s_op = &f2fs_sops;
1017         sb->s_xattr = f2fs_xattr_handlers;
1018         sb->s_export_op = &f2fs_export_ops;
1019         sb->s_magic = F2FS_SUPER_MAGIC;
1020         sb->s_time_gran = 1;
1021         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1022                 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
1023         memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
1024
1025         /* init f2fs-specific super block info */
1026         sbi->sb = sb;
1027         sbi->raw_super = raw_super;
1028         sbi->raw_super_buf = raw_super_buf;
1029         mutex_init(&sbi->gc_mutex);
1030         mutex_init(&sbi->writepages);
1031         mutex_init(&sbi->cp_mutex);
1032         init_rwsem(&sbi->node_write);
1033         clear_sbi_flag(sbi, SBI_POR_DOING);
1034         spin_lock_init(&sbi->stat_lock);
1035
1036         init_rwsem(&sbi->read_io.io_rwsem);
1037         sbi->read_io.sbi = sbi;
1038         sbi->read_io.bio = NULL;
1039         for (i = 0; i < NR_PAGE_TYPE; i++) {
1040                 init_rwsem(&sbi->write_io[i].io_rwsem);
1041                 sbi->write_io[i].sbi = sbi;
1042                 sbi->write_io[i].bio = NULL;
1043         }
1044
1045         init_rwsem(&sbi->cp_rwsem);
1046         init_waitqueue_head(&sbi->cp_wait);
1047         init_sb_info(sbi);
1048
1049         /* get an inode for meta space */
1050         sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
1051         if (IS_ERR(sbi->meta_inode)) {
1052                 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
1053                 err = PTR_ERR(sbi->meta_inode);
1054                 goto free_options;
1055         }
1056
1057         err = get_valid_checkpoint(sbi);
1058         if (err) {
1059                 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
1060                 goto free_meta_inode;
1061         }
1062
1063         /* sanity checking of checkpoint */
1064         err = -EINVAL;
1065         if (sanity_check_ckpt(sbi)) {
1066                 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
1067                 goto free_cp;
1068         }
1069
1070         sbi->total_valid_node_count =
1071                                 le32_to_cpu(sbi->ckpt->valid_node_count);
1072         sbi->total_valid_inode_count =
1073                                 le32_to_cpu(sbi->ckpt->valid_inode_count);
1074         sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
1075         sbi->total_valid_block_count =
1076                                 le64_to_cpu(sbi->ckpt->valid_block_count);
1077         sbi->last_valid_block_count = sbi->total_valid_block_count;
1078         sbi->alloc_valid_block_count = 0;
1079         INIT_LIST_HEAD(&sbi->dir_inode_list);
1080         spin_lock_init(&sbi->dir_inode_lock);
1081
1082         init_extent_cache_info(sbi);
1083
1084         init_ino_entry_info(sbi);
1085
1086         /* setup f2fs internal modules */
1087         err = build_segment_manager(sbi);
1088         if (err) {
1089                 f2fs_msg(sb, KERN_ERR,
1090                         "Failed to initialize F2FS segment manager");
1091                 goto free_sm;
1092         }
1093         err = build_node_manager(sbi);
1094         if (err) {
1095                 f2fs_msg(sb, KERN_ERR,
1096                         "Failed to initialize F2FS node manager");
1097                 goto free_nm;
1098         }
1099
1100         build_gc_manager(sbi);
1101
1102         /* get an inode for node space */
1103         sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
1104         if (IS_ERR(sbi->node_inode)) {
1105                 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
1106                 err = PTR_ERR(sbi->node_inode);
1107                 goto free_nm;
1108         }
1109
1110         /* if there are nt orphan nodes free them */
1111         recover_orphan_inodes(sbi);
1112
1113         /* read root inode and dentry */
1114         root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
1115         if (IS_ERR(root)) {
1116                 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
1117                 err = PTR_ERR(root);
1118                 goto free_node_inode;
1119         }
1120         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1121                 iput(root);
1122                 err = -EINVAL;
1123                 goto free_node_inode;
1124         }
1125
1126         sb->s_root = d_make_root(root); /* allocate root dentry */
1127         if (!sb->s_root) {
1128                 err = -ENOMEM;
1129                 goto free_root_inode;
1130         }
1131
1132         err = f2fs_build_stats(sbi);
1133         if (err)
1134                 goto free_root_inode;
1135
1136         if (f2fs_proc_root)
1137                 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
1138
1139         if (sbi->s_proc)
1140                 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
1141                                  &f2fs_seq_segment_info_fops, sb);
1142
1143         if (test_opt(sbi, DISCARD)) {
1144                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1145                 if (!blk_queue_discard(q))
1146                         f2fs_msg(sb, KERN_WARNING,
1147                                         "mounting with \"discard\" option, but "
1148                                         "the device does not support discard");
1149         }
1150
1151         sbi->s_kobj.kset = f2fs_kset;
1152         init_completion(&sbi->s_kobj_unregister);
1153         err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1154                                                         "%s", sb->s_id);
1155         if (err)
1156                 goto free_proc;
1157
1158         if (!retry)
1159                 set_sbi_flag(sbi, SBI_NEED_FSCK);
1160
1161         /* recover fsynced data */
1162         if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1163                 /*
1164                  * mount should be failed, when device has readonly mode, and
1165                  * previous checkpoint was not done by clean system shutdown.
1166                  */
1167                 if (bdev_read_only(sb->s_bdev) &&
1168                                 !is_set_ckpt_flags(sbi->ckpt, CP_UMOUNT_FLAG)) {
1169                         err = -EROFS;
1170                         goto free_kobj;
1171                 }
1172                 err = recover_fsync_data(sbi);
1173                 if (err) {
1174                         f2fs_msg(sb, KERN_ERR,
1175                                 "Cannot recover all fsync data errno=%ld", err);
1176                         goto free_kobj;
1177                 }
1178         }
1179
1180         /*
1181          * If filesystem is not mounted as read-only then
1182          * do start the gc_thread.
1183          */
1184         if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) {
1185                 /* After POR, we can run background GC thread.*/
1186                 err = start_gc_thread(sbi);
1187                 if (err)
1188                         goto free_kobj;
1189         }
1190         kfree(options);
1191         return 0;
1192
1193 free_kobj:
1194         kobject_del(&sbi->s_kobj);
1195 free_proc:
1196         if (sbi->s_proc) {
1197                 remove_proc_entry("segment_info", sbi->s_proc);
1198                 remove_proc_entry(sb->s_id, f2fs_proc_root);
1199         }
1200         f2fs_destroy_stats(sbi);
1201 free_root_inode:
1202         dput(sb->s_root);
1203         sb->s_root = NULL;
1204 free_node_inode:
1205         iput(sbi->node_inode);
1206 free_nm:
1207         destroy_node_manager(sbi);
1208 free_sm:
1209         destroy_segment_manager(sbi);
1210 free_cp:
1211         kfree(sbi->ckpt);
1212 free_meta_inode:
1213         make_bad_inode(sbi->meta_inode);
1214         iput(sbi->meta_inode);
1215 free_options:
1216         kfree(options);
1217 free_sb_buf:
1218         brelse(raw_super_buf);
1219 free_sbi:
1220         kfree(sbi);
1221
1222         /* give only one another chance */
1223         if (retry) {
1224                 retry = 0;
1225                 shrink_dcache_sb(sb);
1226                 goto try_onemore;
1227         }
1228         return err;
1229 }
1230
1231 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
1232                         const char *dev_name, void *data)
1233 {
1234         return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
1235 }
1236
1237 static void kill_f2fs_super(struct super_block *sb)
1238 {
1239         if (sb->s_root)
1240                 set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE);
1241         kill_block_super(sb);
1242 }
1243
1244 static struct file_system_type f2fs_fs_type = {
1245         .owner          = THIS_MODULE,
1246         .name           = "f2fs",
1247         .mount          = f2fs_mount,
1248         .kill_sb        = kill_f2fs_super,
1249         .fs_flags       = FS_REQUIRES_DEV,
1250 };
1251 MODULE_ALIAS_FS("f2fs");
1252
1253 static int __init init_inodecache(void)
1254 {
1255         f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
1256                         sizeof(struct f2fs_inode_info));
1257         if (!f2fs_inode_cachep)
1258                 return -ENOMEM;
1259         return 0;
1260 }
1261
1262 static void destroy_inodecache(void)
1263 {
1264         /*
1265          * Make sure all delayed rcu free inodes are flushed before we
1266          * destroy cache.
1267          */
1268         rcu_barrier();
1269         kmem_cache_destroy(f2fs_inode_cachep);
1270 }
1271
1272 static int __init init_f2fs_fs(void)
1273 {
1274         int err;
1275
1276         f2fs_build_trace_ios();
1277
1278         err = init_inodecache();
1279         if (err)
1280                 goto fail;
1281         err = create_node_manager_caches();
1282         if (err)
1283                 goto free_inodecache;
1284         err = create_segment_manager_caches();
1285         if (err)
1286                 goto free_node_manager_caches;
1287         err = create_checkpoint_caches();
1288         if (err)
1289                 goto free_segment_manager_caches;
1290         err = create_extent_cache();
1291         if (err)
1292                 goto free_checkpoint_caches;
1293         f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
1294         if (!f2fs_kset) {
1295                 err = -ENOMEM;
1296                 goto free_extent_cache;
1297         }
1298         err = register_filesystem(&f2fs_fs_type);
1299         if (err)
1300                 goto free_kset;
1301         f2fs_create_root_stats();
1302         f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1303         return 0;
1304
1305 free_kset:
1306         kset_unregister(f2fs_kset);
1307 free_extent_cache:
1308         destroy_extent_cache();
1309 free_checkpoint_caches:
1310         destroy_checkpoint_caches();
1311 free_segment_manager_caches:
1312         destroy_segment_manager_caches();
1313 free_node_manager_caches:
1314         destroy_node_manager_caches();
1315 free_inodecache:
1316         destroy_inodecache();
1317 fail:
1318         return err;
1319 }
1320
1321 static void __exit exit_f2fs_fs(void)
1322 {
1323         remove_proc_entry("fs/f2fs", NULL);
1324         f2fs_destroy_root_stats();
1325         unregister_filesystem(&f2fs_fs_type);
1326         destroy_extent_cache();
1327         destroy_checkpoint_caches();
1328         destroy_segment_manager_caches();
1329         destroy_node_manager_caches();
1330         destroy_inodecache();
1331         kset_unregister(f2fs_kset);
1332         f2fs_destroy_trace_ios();
1333 }
1334
1335 module_init(init_f2fs_fs)
1336 module_exit(exit_f2fs_fs)
1337
1338 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1339 MODULE_DESCRIPTION("Flash Friendly File System");
1340 MODULE_LICENSE("GPL");