kernel/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_noinline_data,
  62         Opt_err,
  63 };
  64
  65 static match_table_t f2fs_tokens = {
  66         {Opt_gc_background, "background_gc=%s"},
  67         {Opt_disable_roll_forward, "disable_roll_forward"},
  68         {Opt_norecovery, "norecovery"},
  69         {Opt_discard, "discard"},
  70         {Opt_noheap, "no_heap"},
  71         {Opt_user_xattr, "user_xattr"},
  72         {Opt_nouser_xattr, "nouser_xattr"},
  73         {Opt_acl, "acl"},
  74         {Opt_noacl, "noacl"},
  75         {Opt_active_logs, "active_logs=%u"},
  76         {Opt_disable_ext_identify, "disable_ext_identify"},
  77         {Opt_inline_xattr, "inline_xattr"},
  78         {Opt_inline_data, "inline_data"},
  79         {Opt_inline_dentry, "inline_dentry"},
  80         {Opt_flush_merge, "flush_merge"},
  81         {Opt_nobarrier, "nobarrier"},
  82         {Opt_fastboot, "fastboot"},
  83         {Opt_extent_cache, "extent_cache"},
  84         {Opt_noinline_data, "noinline_data"},
  85         {Opt_err, NULL},
  86 };
  87
  88 /* Sysfs support for f2fs */
  89 enum {
  90         GC_THREAD,      /* struct f2fs_gc_thread */
  91         SM_INFO,        /* struct f2fs_sm_info */
  92         NM_INFO,        /* struct f2fs_nm_info */
  93         F2FS_SBI,       /* struct f2fs_sb_info */
  94 };
  95
  96 struct f2fs_attr {
  97         struct attribute attr;
  98         ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
  99         ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
 100                          const char *, size_t);
 101         int struct_type;
 102         int offset;
 103 };
 104
 105 static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
 106 {
 107         if (struct_type == GC_THREAD)
 108                 return (unsigned char *)sbi->gc_thread;
 109         else if (struct_type == SM_INFO)
 110                 return (unsigned char *)SM_I(sbi);
 111         else if (struct_type == NM_INFO)
 112                 return (unsigned char *)NM_I(sbi);
 113         else if (struct_type == F2FS_SBI)
 114                 return (unsigned char *)sbi;
 115         return NULL;
 116 }
 117
 118 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
 119                         struct f2fs_sb_info *sbi, char *buf)
 120 {
 121         unsigned char *ptr = NULL;
 122         unsigned int *ui;
 123
 124         ptr = __struct_ptr(sbi, a->struct_type);
 125         if (!ptr)
 126                 return -EINVAL;
 127
 128         ui = (unsigned int *)(ptr + a->offset);
 129
 130         return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
 131 }
 132
 133 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
 134                         struct f2fs_sb_info *sbi,
 135                         const char *buf, size_t count)
 136 {
 137         unsigned char *ptr;
 138         unsigned long t;
 139         unsigned int *ui;
 140         ssize_t ret;
 141
 142         ptr = __struct_ptr(sbi, a->struct_type);
 143         if (!ptr)
 144                 return -EINVAL;
 145
 146         ui = (unsigned int *)(ptr + a->offset);
 147
 148         ret = kstrtoul(skip_spaces(buf), 0, &t);
 149         if (ret < 0)
 150                 return ret;
 151         *ui = t;
 152         return count;
 153 }
 154
 155 static ssize_t f2fs_attr_show(struct kobject *kobj,
 156                                 struct attribute *attr, char *buf)
 157 {
 158         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 159                                                                 s_kobj);
 160         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 161
 162         return a->show ? a->show(a, sbi, buf) : 0;
 163 }
 164
 165 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
 166                                                 const char *buf, size_t len)
 167 {
 168         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 169                                                                         s_kobj);
 170         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 171
 172         return a->store ? a->store(a, sbi, buf, len) : 0;
 173 }
 174
 175 static void f2fs_sb_release(struct kobject *kobj)
 176 {
 177         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 178                                                                 s_kobj);
 179         complete(&sbi->s_kobj_unregister);
 180 }
 181
 182 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
 183 static struct f2fs_attr f2fs_attr_##_name = {                   \
 184         .attr = {.name = __stringify(_name), .mode = _mode },   \
 185         .show   = _show,                                        \
 186         .store  = _store,                                       \
 187         .struct_type = _struct_type,                            \
 188         .offset = _offset                                       \
 189 }
 190
 191 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname)    \
 192         F2FS_ATTR_OFFSET(struct_type, name, 0644,               \
 193                 f2fs_sbi_show, f2fs_sbi_store,                  \
 194                 offsetof(struct struct_name, elname))
 195
 196 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
 197 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
 198 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
 199 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
 200 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
 201 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
 202 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
 203 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
 204 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
 205 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
 206 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
 207 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
 208 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
 209
 210 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
 211 static struct attribute *f2fs_attrs[] = {
 212         ATTR_LIST(gc_min_sleep_time),
 213         ATTR_LIST(gc_max_sleep_time),
 214         ATTR_LIST(gc_no_gc_sleep_time),
 215         ATTR_LIST(gc_idle),
 216         ATTR_LIST(reclaim_segments),
 217         ATTR_LIST(max_small_discards),
 218         ATTR_LIST(batched_trim_sections),
 219         ATTR_LIST(ipu_policy),
 220         ATTR_LIST(min_ipu_util),
 221         ATTR_LIST(min_fsync_blocks),
 222         ATTR_LIST(max_victim_search),
 223         ATTR_LIST(dir_level),
 224         ATTR_LIST(ram_thresh),
 225         NULL,
 226 };
 227
 228 static const struct sysfs_ops f2fs_attr_ops = {
 229         .show   = f2fs_attr_show,
 230         .store  = f2fs_attr_store,
 231 };
 232
 233 static struct kobj_type f2fs_ktype = {
 234         .default_attrs  = f2fs_attrs,
 235         .sysfs_ops      = &f2fs_attr_ops,
 236         .release        = f2fs_sb_release,
 237 };
 238
 239 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
 240 {
 241         struct va_format vaf;
 242         va_list args;
 243
 244         va_start(args, fmt);
 245         vaf.fmt = fmt;
 246         vaf.va = &args;
 247         printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
 248         va_end(args);
 249 }
 250
 251 static void init_once(void *foo)
 252 {
 253         struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
 254
 255         inode_init_once(&fi->vfs_inode);
 256 }
 257
 258 static int parse_options(struct super_block *sb, char *options)
 259 {
 260         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 261         substring_t args[MAX_OPT_ARGS];
 262         char *p, *name;
 263         int arg = 0;
 264
 265         if (!options)
 266                 return 0;
 267
 268         while ((p = strsep(&options, ",")) != NULL) {
 269                 int token;
 270                 if (!*p)
 271                         continue;
 272                 /*
 273                  * Initialize args struct so we know whether arg was
 274                  * found; some options take optional arguments.
 275                  */
 276                 args[0].to = args[0].from = NULL;
 277                 token = match_token(p, f2fs_tokens, args);
 278
 279                 switch (token) {
 280                 case Opt_gc_background:
 281                         name = match_strdup(&args[0]);
 282
 283                         if (!name)
 284                                 return -ENOMEM;
 285                         if (strlen(name) == 2 && !strncmp(name, "on", 2))
 286                                 set_opt(sbi, BG_GC);
 287                         else if (strlen(name) == 3 && !strncmp(name, "off", 3))
 288                                 clear_opt(sbi, BG_GC);
 289                         else {
 290                                 kfree(name);
 291                                 return -EINVAL;
 292                         }
 293                         kfree(name);
 294                         break;
 295                 case Opt_disable_roll_forward:
 296                         set_opt(sbi, DISABLE_ROLL_FORWARD);
 297                         break;
 298                 case Opt_norecovery:
 299                         /* this option mounts f2fs with ro */
 300                         set_opt(sbi, DISABLE_ROLL_FORWARD);
 301                         if (!f2fs_readonly(sb))
 302                                 return -EINVAL;
 303                         break;
 304                 case Opt_discard:
 305                         set_opt(sbi, DISCARD);
 306                         break;
 307                 case Opt_noheap:
 308                         set_opt(sbi, NOHEAP);
 309                         break;
 310 #ifdef CONFIG_F2FS_FS_XATTR
 311                 case Opt_user_xattr:
 312                         set_opt(sbi, XATTR_USER);
 313                         break;
 314                 case Opt_nouser_xattr:
 315                         clear_opt(sbi, XATTR_USER);
 316                         break;
 317                 case Opt_inline_xattr:
 318                         set_opt(sbi, INLINE_XATTR);
 319                         break;
 320 #else
 321                 case Opt_user_xattr:
 322                         f2fs_msg(sb, KERN_INFO,
 323                                 "user_xattr options not supported");
 324                         break;
 325                 case Opt_nouser_xattr:
 326                         f2fs_msg(sb, KERN_INFO,
 327                                 "nouser_xattr options not supported");
 328                         break;
 329                 case Opt_inline_xattr:
 330                         f2fs_msg(sb, KERN_INFO,
 331                                 "inline_xattr options not supported");
 332                         break;
 333 #endif
 334 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 335                 case Opt_acl:
 336                         set_opt(sbi, POSIX_ACL);
 337                         break;
 338                 case Opt_noacl:
 339                         clear_opt(sbi, POSIX_ACL);
 340                         break;
 341 #else
 342                 case Opt_acl:
 343                         f2fs_msg(sb, KERN_INFO, "acl options not supported");
 344                         break;
 345                 case Opt_noacl:
 346                         f2fs_msg(sb, KERN_INFO, "noacl options not supported");
 347                         break;
 348 #endif
 349                 case Opt_active_logs:
 350                         if (args->from && match_int(args, &arg))
 351                                 return -EINVAL;
 352                         if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
 353                                 return -EINVAL;
 354                         sbi->active_logs = arg;
 355                         break;
 356                 case Opt_disable_ext_identify:
 357                         set_opt(sbi, DISABLE_EXT_IDENTIFY);
 358                         break;
 359                 case Opt_inline_data:
 360                         set_opt(sbi, INLINE_DATA);
 361                         break;
 362                 case Opt_inline_dentry:
 363                         set_opt(sbi, INLINE_DENTRY);
 364                         break;
 365                 case Opt_flush_merge:
 366                         set_opt(sbi, FLUSH_MERGE);
 367                         break;
 368                 case Opt_nobarrier:
 369                         set_opt(sbi, NOBARRIER);
 370                         break;
 371                 case Opt_fastboot:
 372                         set_opt(sbi, FASTBOOT);
 373                         break;
 374                 case Opt_extent_cache:
 375                         set_opt(sbi, EXTENT_CACHE);
 376                         break;
 377                 case Opt_noinline_data:
 378                         clear_opt(sbi, INLINE_DATA);
 379                         break;
 380                 default:
 381                         f2fs_msg(sb, KERN_ERR,
 382                                 "Unrecognized mount option \"%s\" or missing value",
 383                                 p);
 384                         return -EINVAL;
 385                 }
 386         }
 387         return 0;
 388 }
 389
 390 static struct inode *f2fs_alloc_inode(struct super_block *sb)
 391 {
 392         struct f2fs_inode_info *fi;
 393
 394         fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
 395         if (!fi)
 396                 return NULL;
 397
 398         init_once((void *) fi);
 399
 400         /* Initialize f2fs-specific inode info */
 401         fi->vfs_inode.i_version = 1;
 402         atomic_set(&fi->dirty_pages, 0);
 403         fi->i_current_depth = 1;
 404         fi->i_advise = 0;
 405         rwlock_init(&fi->ext_lock);
 406         init_rwsem(&fi->i_sem);
 407         INIT_RADIX_TREE(&fi->inmem_root, GFP_NOFS);
 408         INIT_LIST_HEAD(&fi->inmem_pages);
 409         mutex_init(&fi->inmem_lock);
 410
 411         set_inode_flag(fi, FI_NEW_INODE);
 412
 413         if (test_opt(F2FS_SB(sb), INLINE_XATTR))
 414                 set_inode_flag(fi, FI_INLINE_XATTR);
 415
 416         /* Will be used by directory only */
 417         fi->i_dir_level = F2FS_SB(sb)->dir_level;
 418
 419         return &fi->vfs_inode;
 420 }
 421
 422 static int f2fs_drop_inode(struct inode *inode)
 423 {
 424         /*
 425          * This is to avoid a deadlock condition like below.
 426          * writeback_single_inode(inode)
 427          *  - f2fs_write_data_page
 428          *    - f2fs_gc -> iput -> evict
 429          *       - inode_wait_for_writeback(inode)
 430          */
 431         if (!inode_unhashed(inode) && inode->i_state & I_SYNC)
 432                 return 0;
 433         return generic_drop_inode(inode);
 434 }
 435
 436 /*
 437  * f2fs_dirty_inode() is called from __mark_inode_dirty()
 438  *
 439  * We should call set_dirty_inode to write the dirty inode through write_inode.
 440  */
 441 static void f2fs_dirty_inode(struct inode *inode, int flags)
 442 {
 443         set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
 444 }
 445
 446 static void f2fs_i_callback(struct rcu_head *head)
 447 {
 448         struct inode *inode = container_of(head, struct inode, i_rcu);
 449         kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
 450 }
 451
 452 static void f2fs_destroy_inode(struct inode *inode)
 453 {
 454         call_rcu(&inode->i_rcu, f2fs_i_callback);
 455 }
 456
 457 static void f2fs_put_super(struct super_block *sb)
 458 {
 459         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 460
 461         if (sbi->s_proc) {
 462                 remove_proc_entry("segment_info", sbi->s_proc);
 463                 remove_proc_entry(sb->s_id, f2fs_proc_root);
 464         }
 465         kobject_del(&sbi->s_kobj);
 466
 467         f2fs_destroy_stats(sbi);
 468         stop_gc_thread(sbi);
 469
 470         /*
 471          * We don't need to do checkpoint when superblock is clean.
 472          * But, the previous checkpoint was not done by umount, it needs to do
 473          * clean checkpoint again.
 474          */
 475         if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
 476                         !is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) {
 477                 struct cp_control cpc = {
 478                         .reason = CP_UMOUNT,
 479                 };
 480                 write_checkpoint(sbi, &cpc);
 481         }
 482
 483         /*
 484          * normally superblock is clean, so we need to release this.
 485          * In addition, EIO will skip do checkpoint, we need this as well.
 486          */
 487         release_dirty_inode(sbi);
 488         release_discard_addrs(sbi);
 489
 490         iput(sbi->node_inode);
 491         iput(sbi->meta_inode);
 492
 493         /* destroy f2fs internal modules */
 494         destroy_node_manager(sbi);
 495         destroy_segment_manager(sbi);
 496
 497         kfree(sbi->ckpt);
 498         kobject_put(&sbi->s_kobj);
 499         wait_for_completion(&sbi->s_kobj_unregister);
 500
 501         sb->s_fs_info = NULL;
 502         brelse(sbi->raw_super_buf);
 503         kfree(sbi);
 504 }
 505
 506 int f2fs_sync_fs(struct super_block *sb, int sync)
 507 {
 508         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 509
 510         trace_f2fs_sync_fs(sb, sync);
 511
 512         if (sync) {
 513                 struct cp_control cpc;
 514
 515                 cpc.reason = __get_cp_reason(sbi);
 516
 517                 mutex_lock(&sbi->gc_mutex);
 518                 write_checkpoint(sbi, &cpc);
 519                 mutex_unlock(&sbi->gc_mutex);
 520         } else {
 521                 f2fs_balance_fs(sbi);
 522         }
 523         f2fs_trace_ios(NULL, NULL, 1);
 524
 525         return 0;
 526 }
 527
 528 static int f2fs_freeze(struct super_block *sb)
 529 {
 530         int err;
 531
 532         if (f2fs_readonly(sb))
 533                 return 0;
 534
 535         err = f2fs_sync_fs(sb, 1);
 536         return err;
 537 }
 538
 539 static int f2fs_unfreeze(struct super_block *sb)
 540 {
 541         return 0;
 542 }
 543
 544 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
 545 {
 546         struct super_block *sb = dentry->d_sb;
 547         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 548         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 549         block_t total_count, user_block_count, start_count, ovp_count;
 550
 551         total_count = le64_to_cpu(sbi->raw_super->block_count);
 552         user_block_count = sbi->user_block_count;
 553         start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
 554         ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
 555         buf->f_type = F2FS_SUPER_MAGIC;
 556         buf->f_bsize = sbi->blocksize;
 557
 558         buf->f_blocks = total_count - start_count;
 559         buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
 560         buf->f_bavail = user_block_count - valid_user_blocks(sbi);
 561
 562         buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
 563         buf->f_ffree = buf->f_files - valid_inode_count(sbi);
 564
 565         buf->f_namelen = F2FS_NAME_LEN;
 566         buf->f_fsid.val[0] = (u32)id;
 567         buf->f_fsid.val[1] = (u32)(id >> 32);
 568
 569         return 0;
 570 }
 571
 572 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
 573 {
 574         struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
 575
 576         if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC))
 577                 seq_printf(seq, ",background_gc=%s", "on");
 578         else
 579                 seq_printf(seq, ",background_gc=%s", "off");
 580         if (test_opt(sbi, DISABLE_ROLL_FORWARD))
 581                 seq_puts(seq, ",disable_roll_forward");
 582         if (test_opt(sbi, DISCARD))
 583                 seq_puts(seq, ",discard");
 584         if (test_opt(sbi, NOHEAP))
 585                 seq_puts(seq, ",no_heap_alloc");
 586 #ifdef CONFIG_F2FS_FS_XATTR
 587         if (test_opt(sbi, XATTR_USER))
 588                 seq_puts(seq, ",user_xattr");
 589         else
 590                 seq_puts(seq, ",nouser_xattr");
 591         if (test_opt(sbi, INLINE_XATTR))
 592                 seq_puts(seq, ",inline_xattr");
 593 #endif
 594 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 595         if (test_opt(sbi, POSIX_ACL))
 596                 seq_puts(seq, ",acl");
 597         else
 598                 seq_puts(seq, ",noacl");
 599 #endif
 600         if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
 601                 seq_puts(seq, ",disable_ext_identify");
 602         if (test_opt(sbi, INLINE_DATA))
 603                 seq_puts(seq, ",inline_data");
 604         else
 605                 seq_puts(seq, ",noinline_data");
 606         if (test_opt(sbi, INLINE_DENTRY))
 607                 seq_puts(seq, ",inline_dentry");
 608         if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
 609                 seq_puts(seq, ",flush_merge");
 610         if (test_opt(sbi, NOBARRIER))
 611                 seq_puts(seq, ",nobarrier");
 612         if (test_opt(sbi, FASTBOOT))
 613                 seq_puts(seq, ",fastboot");
 614         if (test_opt(sbi, EXTENT_CACHE))
 615                 seq_puts(seq, ",extent_cache");
 616         seq_printf(seq, ",active_logs=%u", sbi->active_logs);
 617
 618         return 0;
 619 }
 620
 621 static int segment_info_seq_show(struct seq_file *seq, void *offset)
 622 {
 623         struct super_block *sb = seq->private;
 624         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 625         unsigned int total_segs =
 626                         le32_to_cpu(sbi->raw_super->segment_count_main);
 627         int i;
 628
 629         seq_puts(seq, "format: segment_type|valid_blocks\n"
 630                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
 631
 632         for (i = 0; i < total_segs; i++) {
 633                 struct seg_entry *se = get_seg_entry(sbi, i);
 634
 635                 if ((i % 10) == 0)
 636                         seq_printf(seq, "%-5d", i);
 637                 seq_printf(seq, "%d|%-3u", se->type,
 638                                         get_valid_blocks(sbi, i, 1));
 639                 if ((i % 10) == 9 || i == (total_segs - 1))
 640                         seq_putc(seq, '\n');
 641                 else
 642                         seq_putc(seq, ' ');
 643         }
 644
 645         return 0;
 646 }
 647
 648 static int segment_info_open_fs(struct inode *inode, struct file *file)
 649 {
 650         return single_open(file, segment_info_seq_show, PDE_DATA(inode));
 651 }
 652
 653 static const struct file_operations f2fs_seq_segment_info_fops = {
 654         .owner = THIS_MODULE,
 655         .open = segment_info_open_fs,
 656         .read = seq_read,
 657         .llseek = seq_lseek,
 658         .release = single_release,
 659 };
 660
 661 static int f2fs_remount(struct super_block *sb, int *flags, char *data)
 662 {
 663         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 664         struct f2fs_mount_info org_mount_opt;
 665         int err, active_logs;
 666         bool need_restart_gc = false;
 667         bool need_stop_gc = false;
 668
 669         sync_filesystem(sb);
 670
 671         /*
 672          * Save the old mount options in case we
 673          * need to restore them.
 674          */
 675         org_mount_opt = sbi->mount_opt;
 676         active_logs = sbi->active_logs;
 677
 678         sbi->mount_opt.opt = 0;
 679         sbi->active_logs = NR_CURSEG_TYPE;
 680
 681         /* parse mount options */
 682         err = parse_options(sb, data);
 683         if (err)
 684                 goto restore_opts;
 685
 686         /*
 687          * Previous and new state of filesystem is RO,
 688          * so skip checking GC and FLUSH_MERGE conditions.
 689          */
 690         if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
 691                 goto skip;
 692
 693         /*
 694          * We stop the GC thread if FS is mounted as RO
 695          * or if background_gc = off is passed in mount
 696          * option. Also sync the filesystem.
 697          */
 698         if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
 699                 if (sbi->gc_thread) {
 700                         stop_gc_thread(sbi);
 701                         f2fs_sync_fs(sb, 1);
 702                         need_restart_gc = true;
 703                 }
 704         } else if (!sbi->gc_thread) {
 705                 err = start_gc_thread(sbi);
 706                 if (err)
 707                         goto restore_opts;
 708                 need_stop_gc = true;
 709         }
 710
 711         /*
 712          * We stop issue flush thread if FS is mounted as RO
 713          * or if flush_merge is not passed in mount option.
 714          */
 715         if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
 716                 destroy_flush_cmd_control(sbi);
 717         } else if (!SM_I(sbi)->cmd_control_info) {
 718                 err = create_flush_cmd_control(sbi);
 719                 if (err)
 720                         goto restore_gc;
 721         }
 722 skip:
 723         /* Update the POSIXACL Flag */
 724          sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 725                 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
 726         return 0;
 727 restore_gc:
 728         if (need_restart_gc) {
 729                 if (start_gc_thread(sbi))
 730                         f2fs_msg(sbi->sb, KERN_WARNING,
 731                                 "background gc thread has stopped");
 732         } else if (need_stop_gc) {
 733                 stop_gc_thread(sbi);
 734         }
 735 restore_opts:
 736         sbi->mount_opt = org_mount_opt;
 737         sbi->active_logs = active_logs;
 738         return err;
 739 }
 740
 741 static struct super_operations f2fs_sops = {
 742         .alloc_inode    = f2fs_alloc_inode,
 743         .drop_inode     = f2fs_drop_inode,
 744         .destroy_inode  = f2fs_destroy_inode,
 745         .write_inode    = f2fs_write_inode,
 746         .dirty_inode    = f2fs_dirty_inode,
 747         .show_options   = f2fs_show_options,
 748         .evict_inode    = f2fs_evict_inode,
 749         .put_super      = f2fs_put_super,
 750         .sync_fs        = f2fs_sync_fs,
 751         .freeze_fs      = f2fs_freeze,
 752         .unfreeze_fs    = f2fs_unfreeze,
 753         .statfs         = f2fs_statfs,
 754         .remount_fs     = f2fs_remount,
 755 };
 756
 757 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
 758                 u64 ino, u32 generation)
 759 {
 760         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 761         struct inode *inode;
 762
 763         if (check_nid_range(sbi, ino))
 764                 return ERR_PTR(-ESTALE);
 765
 766         /*
 767          * f2fs_iget isn't quite right if the inode is currently unallocated!
 768          * However f2fs_iget currently does appropriate checks to handle stale
 769          * inodes so everything is OK.
 770          */
 771         inode = f2fs_iget(sb, ino);
 772         if (IS_ERR(inode))
 773                 return ERR_CAST(inode);
 774         if (unlikely(generation && inode->i_generation != generation)) {
 775                 /* we didn't find the right inode.. */
 776                 iput(inode);
 777                 return ERR_PTR(-ESTALE);
 778         }
 779         return inode;
 780 }
 781
 782 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
 783                 int fh_len, int fh_type)
 784 {
 785         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 786                                     f2fs_nfs_get_inode);
 787 }
 788
 789 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
 790                 int fh_len, int fh_type)
 791 {
 792         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 793                                     f2fs_nfs_get_inode);
 794 }
 795
 796 static const struct export_operations f2fs_export_ops = {
 797         .fh_to_dentry = f2fs_fh_to_dentry,
 798         .fh_to_parent = f2fs_fh_to_parent,
 799         .get_parent = f2fs_get_parent,
 800 };
 801
 802 static loff_t max_file_size(unsigned bits)
 803 {
 804         loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
 805         loff_t leaf_count = ADDRS_PER_BLOCK;
 806
 807         /* two direct node blocks */
 808         result += (leaf_count * 2);
 809
 810         /* two indirect node blocks */
 811         leaf_count *= NIDS_PER_BLOCK;
 812         result += (leaf_count * 2);
 813
 814         /* one double indirect node block */
 815         leaf_count *= NIDS_PER_BLOCK;
 816         result += leaf_count;
 817
 818         result <<= bits;
 819         return result;
 820 }
 821
 822 static int sanity_check_raw_super(struct super_block *sb,
 823                         struct f2fs_super_block *raw_super)
 824 {
 825         unsigned int blocksize;
 826
 827         if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
 828                 f2fs_msg(sb, KERN_INFO,
 829                         "Magic Mismatch, valid(0x%x) - read(0x%x)",
 830                         F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
 831                 return 1;
 832         }
 833
 834         /* Currently, support only 4KB page cache size */
 835         if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
 836                 f2fs_msg(sb, KERN_INFO,
 837                         "Invalid page_cache_size (%lu), supports only 4KB\n",
 838                         PAGE_CACHE_SIZE);
 839                 return 1;
 840         }
 841
 842         /* Currently, support only 4KB block size */
 843         blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
 844         if (blocksize != F2FS_BLKSIZE) {
 845                 f2fs_msg(sb, KERN_INFO,
 846                         "Invalid blocksize (%u), supports only 4KB\n",
 847                         blocksize);
 848                 return 1;
 849         }
 850
 851         /* Currently, support 512/1024/2048/4096 bytes sector size */
 852         if (le32_to_cpu(raw_super->log_sectorsize) >
 853                                 F2FS_MAX_LOG_SECTOR_SIZE ||
 854                 le32_to_cpu(raw_super->log_sectorsize) <
 855                                 F2FS_MIN_LOG_SECTOR_SIZE) {
 856                 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)",
 857                         le32_to_cpu(raw_super->log_sectorsize));
 858                 return 1;
 859         }
 860         if (le32_to_cpu(raw_super->log_sectors_per_block) +
 861                 le32_to_cpu(raw_super->log_sectorsize) !=
 862                         F2FS_MAX_LOG_SECTOR_SIZE) {
 863                 f2fs_msg(sb, KERN_INFO,
 864                         "Invalid log sectors per block(%u) log sectorsize(%u)",
 865                         le32_to_cpu(raw_super->log_sectors_per_block),
 866                         le32_to_cpu(raw_super->log_sectorsize));
 867                 return 1;
 868         }
 869         return 0;
 870 }
 871
 872 static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
 873 {
 874         unsigned int total, fsmeta;
 875         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
 876         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 877
 878         total = le32_to_cpu(raw_super->segment_count);
 879         fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
 880         fsmeta += le32_to_cpu(raw_super->segment_count_sit);
 881         fsmeta += le32_to_cpu(raw_super->segment_count_nat);
 882         fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
 883         fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
 884
 885         if (unlikely(fsmeta >= total))
 886                 return 1;
 887
 888         if (unlikely(f2fs_cp_error(sbi))) {
 889                 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
 890                 return 1;
 891         }
 892         return 0;
 893 }
 894
 895 static void init_sb_info(struct f2fs_sb_info *sbi)
 896 {
 897         struct f2fs_super_block *raw_super = sbi->raw_super;
 898         int i;
 899
 900         sbi->log_sectors_per_block =
 901                 le32_to_cpu(raw_super->log_sectors_per_block);
 902         sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
 903         sbi->blocksize = 1 << sbi->log_blocksize;
 904         sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
 905         sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
 906         sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
 907         sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
 908         sbi->total_sections = le32_to_cpu(raw_super->section_count);
 909         sbi->total_node_count =
 910                 (le32_to_cpu(raw_super->segment_count_nat) / 2)
 911                         * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
 912         sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
 913         sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
 914         sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
 915         sbi->cur_victim_sec = NULL_SECNO;
 916         sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
 917
 918         for (i = 0; i < NR_COUNT_TYPE; i++)
 919                 atomic_set(&sbi->nr_pages[i], 0);
 920
 921         sbi->dir_level = DEF_DIR_LEVEL;
 922         clear_sbi_flag(sbi, SBI_NEED_FSCK);
 923 }
 924
 925 /*
 926  * Read f2fs raw super block.
 927  * Because we have two copies of super block, so read the first one at first,
 928  * if the first one is invalid, move to read the second one.
 929  */
 930 static int read_raw_super_block(struct super_block *sb,
 931                         struct f2fs_super_block **raw_super,
 932                         struct buffer_head **raw_super_buf)
 933 {
 934         int block = 0;
 935
 936 retry:
 937         *raw_super_buf = sb_bread(sb, block);
 938         if (!*raw_super_buf) {
 939                 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
 940                                 block + 1);
 941                 if (block == 0) {
 942                         block++;
 943                         goto retry;
 944                 } else {
 945                         return -EIO;
 946                 }
 947         }
 948
 949         *raw_super = (struct f2fs_super_block *)
 950                 ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
 951
 952         /* sanity checking of raw super */
 953         if (sanity_check_raw_super(sb, *raw_super)) {
 954                 brelse(*raw_super_buf);
 955                 f2fs_msg(sb, KERN_ERR,
 956                         "Can't find valid F2FS filesystem in %dth superblock",
 957                                                                 block + 1);
 958                 if (block == 0) {
 959                         block++;
 960                         goto retry;
 961                 } else {
 962                         return -EINVAL;
 963                 }
 964         }
 965
 966         return 0;
 967 }
 968
 969 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 970 {
 971         struct f2fs_sb_info *sbi;
 972         struct f2fs_super_block *raw_super = NULL;
 973         struct buffer_head *raw_super_buf;
 974         struct inode *root;
 975         long err = -EINVAL;
 976         bool retry = true, need_fsck = false;
 977         char *options = NULL;
 978         int i;
 979
 980 try_onemore:
 981         /* allocate memory for f2fs-specific super block info */
 982         sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
 983         if (!sbi)
 984                 return -ENOMEM;
 985
 986         /* set a block size */
 987         if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
 988                 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
 989                 goto free_sbi;
 990         }
 991
 992         err = read_raw_super_block(sb, &raw_super, &raw_super_buf);
 993         if (err)
 994                 goto free_sbi;
 995
 996         sb->s_fs_info = sbi;
 997         /* init some FS parameters */
 998         sbi->active_logs = NR_CURSEG_TYPE;
 999
1000         set_opt(sbi, BG_GC);
1001         set_opt(sbi, INLINE_DATA);
1002
1003 #ifdef CONFIG_F2FS_FS_XATTR
1004         set_opt(sbi, XATTR_USER);
1005 #endif
1006 #ifdef CONFIG_F2FS_FS_POSIX_ACL
1007         set_opt(sbi, POSIX_ACL);
1008 #endif
1009         /* parse mount options */
1010         options = kstrdup((const char *)data, GFP_KERNEL);
1011         if (data && !options) {
1012                 err = -ENOMEM;
1013                 goto free_sb_buf;
1014         }
1015
1016         err = parse_options(sb, options);
1017         if (err)
1018                 goto free_options;
1019
1020         sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
1021         sb->s_max_links = F2FS_LINK_MAX;
1022         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1023
1024         sb->s_op = &f2fs_sops;
1025         sb->s_xattr = f2fs_xattr_handlers;
1026         sb->s_export_op = &f2fs_export_ops;
1027         sb->s_magic = F2FS_SUPER_MAGIC;
1028         sb->s_time_gran = 1;
1029         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1030                 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
1031         memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
1032
1033         /* init f2fs-specific super block info */
1034         sbi->sb = sb;
1035         sbi->raw_super = raw_super;
1036         sbi->raw_super_buf = raw_super_buf;
1037         mutex_init(&sbi->gc_mutex);
1038         mutex_init(&sbi->writepages);
1039         mutex_init(&sbi->cp_mutex);
1040         init_rwsem(&sbi->node_write);
1041         clear_sbi_flag(sbi, SBI_POR_DOING);
1042         spin_lock_init(&sbi->stat_lock);
1043
1044         init_rwsem(&sbi->read_io.io_rwsem);
1045         sbi->read_io.sbi = sbi;
1046         sbi->read_io.bio = NULL;
1047         for (i = 0; i < NR_PAGE_TYPE; i++) {
1048                 init_rwsem(&sbi->write_io[i].io_rwsem);
1049                 sbi->write_io[i].sbi = sbi;
1050                 sbi->write_io[i].bio = NULL;
1051         }
1052
1053         init_rwsem(&sbi->cp_rwsem);
1054         init_waitqueue_head(&sbi->cp_wait);
1055         init_sb_info(sbi);
1056
1057         /* get an inode for meta space */
1058         sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
1059         if (IS_ERR(sbi->meta_inode)) {
1060                 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
1061                 err = PTR_ERR(sbi->meta_inode);
1062                 goto free_options;
1063         }
1064
1065         err = get_valid_checkpoint(sbi);
1066         if (err) {
1067                 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
1068                 goto free_meta_inode;
1069         }
1070
1071         /* sanity checking of checkpoint */
1072         err = -EINVAL;
1073         if (sanity_check_ckpt(sbi)) {
1074                 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
1075                 goto free_cp;
1076         }
1077
1078         sbi->total_valid_node_count =
1079                                 le32_to_cpu(sbi->ckpt->valid_node_count);
1080         sbi->total_valid_inode_count =
1081                                 le32_to_cpu(sbi->ckpt->valid_inode_count);
1082         sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
1083         sbi->total_valid_block_count =
1084                                 le64_to_cpu(sbi->ckpt->valid_block_count);
1085         sbi->last_valid_block_count = sbi->total_valid_block_count;
1086         sbi->alloc_valid_block_count = 0;
1087         INIT_LIST_HEAD(&sbi->dir_inode_list);
1088         spin_lock_init(&sbi->dir_inode_lock);
1089
1090         init_extent_cache_info(sbi);
1091
1092         init_ino_entry_info(sbi);
1093
1094         /* setup f2fs internal modules */
1095         err = build_segment_manager(sbi);
1096         if (err) {
1097                 f2fs_msg(sb, KERN_ERR,
1098                         "Failed to initialize F2FS segment manager");
1099                 goto free_sm;
1100         }
1101         err = build_node_manager(sbi);
1102         if (err) {
1103                 f2fs_msg(sb, KERN_ERR,
1104                         "Failed to initialize F2FS node manager");
1105                 goto free_nm;
1106         }
1107
1108         build_gc_manager(sbi);
1109
1110         /* get an inode for node space */
1111         sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
1112         if (IS_ERR(sbi->node_inode)) {
1113                 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
1114                 err = PTR_ERR(sbi->node_inode);
1115                 goto free_nm;
1116         }
1117
1118         /* if there are nt orphan nodes free them */
1119         recover_orphan_inodes(sbi);
1120
1121         /* read root inode and dentry */
1122         root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
1123         if (IS_ERR(root)) {
1124                 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
1125                 err = PTR_ERR(root);
1126                 goto free_node_inode;
1127         }
1128         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1129                 iput(root);
1130                 err = -EINVAL;
1131                 goto free_node_inode;
1132         }
1133
1134         sb->s_root = d_make_root(root); /* allocate root dentry */
1135         if (!sb->s_root) {
1136                 err = -ENOMEM;
1137                 goto free_root_inode;
1138         }
1139
1140         err = f2fs_build_stats(sbi);
1141         if (err)
1142                 goto free_root_inode;
1143
1144         if (f2fs_proc_root)
1145                 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
1146
1147         if (sbi->s_proc)
1148                 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
1149                                  &f2fs_seq_segment_info_fops, sb);
1150
1151         if (test_opt(sbi, DISCARD)) {
1152                 struct request_queue *q = bdev_get_queue(sb->s_bdev);
1153                 if (!blk_queue_discard(q))
1154                         f2fs_msg(sb, KERN_WARNING,
1155                                         "mounting with \"discard\" option, but "
1156                                         "the device does not support discard");
1157         }
1158
1159         sbi->s_kobj.kset = f2fs_kset;
1160         init_completion(&sbi->s_kobj_unregister);
1161         err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1162                                                         "%s", sb->s_id);
1163         if (err)
1164                 goto free_proc;
1165
1166         /* recover fsynced data */
1167         if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1168                 /*
1169                  * mount should be failed, when device has readonly mode, and
1170                  * previous checkpoint was not done by clean system shutdown.
1171                  */
1172                 if (bdev_read_only(sb->s_bdev) &&
1173                                 !is_set_ckpt_flags(sbi->ckpt, CP_UMOUNT_FLAG)) {
1174                         err = -EROFS;
1175                         goto free_kobj;
1176                 }
1177
1178                 if (need_fsck)
1179                         set_sbi_flag(sbi, SBI_NEED_FSCK);
1180
1181                 err = recover_fsync_data(sbi);
1182                 if (err) {
1183                         need_fsck = true;
1184                         f2fs_msg(sb, KERN_ERR,
1185                                 "Cannot recover all fsync data errno=%ld", err);
1186                         goto free_kobj;
1187                 }
1188         }
1189
1190         /*
1191          * If filesystem is not mounted as read-only then
1192          * do start the gc_thread.
1193          */
1194         if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) {
1195                 /* After POR, we can run background GC thread.*/
1196                 err = start_gc_thread(sbi);
1197                 if (err)
1198                         goto free_kobj;
1199         }
1200         kfree(options);
1201         return 0;
1202
1203 free_kobj:
1204         kobject_del(&sbi->s_kobj);
1205 free_proc:
1206         if (sbi->s_proc) {
1207                 remove_proc_entry("segment_info", sbi->s_proc);
1208                 remove_proc_entry(sb->s_id, f2fs_proc_root);
1209         }
1210         f2fs_destroy_stats(sbi);
1211 free_root_inode:
1212         dput(sb->s_root);
1213         sb->s_root = NULL;
1214 free_node_inode:
1215         iput(sbi->node_inode);
1216 free_nm:
1217         destroy_node_manager(sbi);
1218 free_sm:
1219         destroy_segment_manager(sbi);
1220 free_cp:
1221         kfree(sbi->ckpt);
1222 free_meta_inode:
1223         make_bad_inode(sbi->meta_inode);
1224         iput(sbi->meta_inode);
1225 free_options:
1226         kfree(options);
1227 free_sb_buf:
1228         brelse(raw_super_buf);
1229 free_sbi:
1230         kfree(sbi);
1231
1232         /* give only one another chance */
1233         if (retry) {
1234                 retry = false;
1235                 shrink_dcache_sb(sb);
1236                 goto try_onemore;
1237         }
1238         return err;
1239 }
1240
1241 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
1242                         const char *dev_name, void *data)
1243 {
1244         return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
1245 }
1246
1247 static void kill_f2fs_super(struct super_block *sb)
1248 {
1249         if (sb->s_root)
1250                 set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE);
1251         kill_block_super(sb);
1252 }
1253
1254 static struct file_system_type f2fs_fs_type = {
1255         .owner          = THIS_MODULE,
1256         .name           = "f2fs",
1257         .mount          = f2fs_mount,
1258         .kill_sb        = kill_f2fs_super,
1259         .fs_flags       = FS_REQUIRES_DEV,
1260 };
1261 MODULE_ALIAS_FS("f2fs");
1262
1263 static int __init init_inodecache(void)
1264 {
1265         f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
1266                         sizeof(struct f2fs_inode_info));
1267         if (!f2fs_inode_cachep)
1268                 return -ENOMEM;
1269         return 0;
1270 }
1271
1272 static void destroy_inodecache(void)
1273 {
1274         /*
1275          * Make sure all delayed rcu free inodes are flushed before we
1276          * destroy cache.
1277          */
1278         rcu_barrier();
1279         kmem_cache_destroy(f2fs_inode_cachep);
1280 }
1281
1282 static int __init init_f2fs_fs(void)
1283 {
1284         int err;
1285
1286         f2fs_build_trace_ios();
1287
1288         err = init_inodecache();
1289         if (err)
1290                 goto fail;
1291         err = create_node_manager_caches();
1292         if (err)
1293                 goto free_inodecache;
1294         err = create_segment_manager_caches();
1295         if (err)
1296                 goto free_node_manager_caches;
1297         err = create_checkpoint_caches();
1298         if (err)
1299                 goto free_segment_manager_caches;
1300         err = create_extent_cache();
1301         if (err)
1302                 goto free_checkpoint_caches;
1303         f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
1304         if (!f2fs_kset) {
1305                 err = -ENOMEM;
1306                 goto free_extent_cache;
1307         }
1308         err = register_filesystem(&f2fs_fs_type);
1309         if (err)
1310                 goto free_kset;
1311         f2fs_create_root_stats();
1312         f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1313         return 0;
1314
1315 free_kset:
1316         kset_unregister(f2fs_kset);
1317 free_extent_cache:
1318         destroy_extent_cache();
1319 free_checkpoint_caches:
1320         destroy_checkpoint_caches();
1321 free_segment_manager_caches:
1322         destroy_segment_manager_caches();
1323 free_node_manager_caches:
1324         destroy_node_manager_caches();
1325 free_inodecache:
1326         destroy_inodecache();
1327 fail:
1328         return err;
1329 }
1330
1331 static void __exit exit_f2fs_fs(void)
1332 {
1333         remove_proc_entry("fs/f2fs", NULL);
1334         f2fs_destroy_root_stats();
1335         unregister_filesystem(&f2fs_fs_type);
1336         destroy_extent_cache();
1337         destroy_checkpoint_caches();
1338         destroy_segment_manager_caches();
1339         destroy_node_manager_caches();
1340         destroy_inodecache();
1341         kset_unregister(f2fs_kset);
1342         f2fs_destroy_trace_ios();
1343 }
1344
1345 module_init(init_f2fs_fs)
1346 module_exit(exit_f2fs_fs)
1347
1348 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1349 MODULE_DESCRIPTION("Flash Friendly File System");
1350 MODULE_LICENSE("GPL");