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 /* f2fs-wide shrinker description */
  43 static struct shrinker f2fs_shrinker_info = {
  44         .scan_objects = f2fs_shrink_scan,
  45         .count_objects = f2fs_shrink_count,
  46         .seeks = DEFAULT_SEEKS,
  47 };
  48
  49 enum {
  50         Opt_gc_background,
  51         Opt_disable_roll_forward,
  52         Opt_norecovery,
  53         Opt_discard,
  54         Opt_noheap,
  55         Opt_user_xattr,
  56         Opt_nouser_xattr,
  57         Opt_acl,
  58         Opt_noacl,
  59         Opt_active_logs,
  60         Opt_disable_ext_identify,
  61         Opt_inline_xattr,
  62         Opt_inline_data,
  63         Opt_inline_dentry,
  64         Opt_flush_merge,
  65         Opt_nobarrier,
  66         Opt_fastboot,
  67         Opt_extent_cache,
  68         Opt_noextent_cache,
  69         Opt_noinline_data,
  70         Opt_err,
  71 };
  72
  73 static match_table_t f2fs_tokens = {
  74         {Opt_gc_background, "background_gc=%s"},
  75         {Opt_disable_roll_forward, "disable_roll_forward"},
  76         {Opt_norecovery, "norecovery"},
  77         {Opt_discard, "discard"},
  78         {Opt_noheap, "no_heap"},
  79         {Opt_user_xattr, "user_xattr"},
  80         {Opt_nouser_xattr, "nouser_xattr"},
  81         {Opt_acl, "acl"},
  82         {Opt_noacl, "noacl"},
  83         {Opt_active_logs, "active_logs=%u"},
  84         {Opt_disable_ext_identify, "disable_ext_identify"},
  85         {Opt_inline_xattr, "inline_xattr"},
  86         {Opt_inline_data, "inline_data"},
  87         {Opt_inline_dentry, "inline_dentry"},
  88         {Opt_flush_merge, "flush_merge"},
  89         {Opt_nobarrier, "nobarrier"},
  90         {Opt_fastboot, "fastboot"},
  91         {Opt_extent_cache, "extent_cache"},
  92         {Opt_noextent_cache, "noextent_cache"},
  93         {Opt_noinline_data, "noinline_data"},
  94         {Opt_err, NULL},
  95 };
  96
  97 /* Sysfs support for f2fs */
  98 enum {
  99         GC_THREAD,      /* struct f2fs_gc_thread */
 100         SM_INFO,        /* struct f2fs_sm_info */
 101         NM_INFO,        /* struct f2fs_nm_info */
 102         F2FS_SBI,       /* struct f2fs_sb_info */
 103 };
 104
 105 struct f2fs_attr {
 106         struct attribute attr;
 107         ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
 108         ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
 109                          const char *, size_t);
 110         int struct_type;
 111         int offset;
 112 };
 113
 114 static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
 115 {
 116         if (struct_type == GC_THREAD)
 117                 return (unsigned char *)sbi->gc_thread;
 118         else if (struct_type == SM_INFO)
 119                 return (unsigned char *)SM_I(sbi);
 120         else if (struct_type == NM_INFO)
 121                 return (unsigned char *)NM_I(sbi);
 122         else if (struct_type == F2FS_SBI)
 123                 return (unsigned char *)sbi;
 124         return NULL;
 125 }
 126
 127 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
 128                         struct f2fs_sb_info *sbi, char *buf)
 129 {
 130         unsigned char *ptr = NULL;
 131         unsigned int *ui;
 132
 133         ptr = __struct_ptr(sbi, a->struct_type);
 134         if (!ptr)
 135                 return -EINVAL;
 136
 137         ui = (unsigned int *)(ptr + a->offset);
 138
 139         return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
 140 }
 141
 142 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
 143                         struct f2fs_sb_info *sbi,
 144                         const char *buf, size_t count)
 145 {
 146         unsigned char *ptr;
 147         unsigned long t;
 148         unsigned int *ui;
 149         ssize_t ret;
 150
 151         ptr = __struct_ptr(sbi, a->struct_type);
 152         if (!ptr)
 153                 return -EINVAL;
 154
 155         ui = (unsigned int *)(ptr + a->offset);
 156
 157         ret = kstrtoul(skip_spaces(buf), 0, &t);
 158         if (ret < 0)
 159                 return ret;
 160         *ui = t;
 161         return count;
 162 }
 163
 164 static ssize_t f2fs_attr_show(struct kobject *kobj,
 165                                 struct attribute *attr, char *buf)
 166 {
 167         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 168                                                                 s_kobj);
 169         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 170
 171         return a->show ? a->show(a, sbi, buf) : 0;
 172 }
 173
 174 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
 175                                                 const char *buf, size_t len)
 176 {
 177         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 178                                                                         s_kobj);
 179         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 180
 181         return a->store ? a->store(a, sbi, buf, len) : 0;
 182 }
 183
 184 static void f2fs_sb_release(struct kobject *kobj)
 185 {
 186         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 187                                                                 s_kobj);
 188         complete(&sbi->s_kobj_unregister);
 189 }
 190
 191 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
 192 static struct f2fs_attr f2fs_attr_##_name = {                   \
 193         .attr = {.name = __stringify(_name), .mode = _mode },   \
 194         .show   = _show,                                        \
 195         .store  = _store,                                       \
 196         .struct_type = _struct_type,                            \
 197         .offset = _offset                                       \
 198 }
 199
 200 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname)    \
 201         F2FS_ATTR_OFFSET(struct_type, name, 0644,               \
 202                 f2fs_sbi_show, f2fs_sbi_store,                  \
 203                 offsetof(struct struct_name, elname))
 204
 205 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
 206 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
 207 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
 208 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
 209 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
 210 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
 211 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
 212 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
 213 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
 214 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
 215 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
 216 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
 217 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
 218
 219 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
 220 static struct attribute *f2fs_attrs[] = {
 221         ATTR_LIST(gc_min_sleep_time),
 222         ATTR_LIST(gc_max_sleep_time),
 223         ATTR_LIST(gc_no_gc_sleep_time),
 224         ATTR_LIST(gc_idle),
 225         ATTR_LIST(reclaim_segments),
 226         ATTR_LIST(max_small_discards),
 227         ATTR_LIST(batched_trim_sections),
 228         ATTR_LIST(ipu_policy),
 229         ATTR_LIST(min_ipu_util),
 230         ATTR_LIST(min_fsync_blocks),
 231         ATTR_LIST(max_victim_search),
 232         ATTR_LIST(dir_level),
 233         ATTR_LIST(ram_thresh),
 234         NULL,
 235 };
 236
 237 static const struct sysfs_ops f2fs_attr_ops = {
 238         .show   = f2fs_attr_show,
 239         .store  = f2fs_attr_store,
 240 };
 241
 242 static struct kobj_type f2fs_ktype = {
 243         .default_attrs  = f2fs_attrs,
 244         .sysfs_ops      = &f2fs_attr_ops,
 245         .release        = f2fs_sb_release,
 246 };
 247
 248 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
 249 {
 250         struct va_format vaf;
 251         va_list args;
 252
 253         va_start(args, fmt);
 254         vaf.fmt = fmt;
 255         vaf.va = &args;
 256         printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
 257         va_end(args);
 258 }
 259
 260 static void init_once(void *foo)
 261 {
 262         struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
 263
 264         inode_init_once(&fi->vfs_inode);
 265 }
 266
 267 static int parse_options(struct super_block *sb, char *options)
 268 {
 269         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 270         struct request_queue *q;
 271         substring_t args[MAX_OPT_ARGS];
 272         char *p, *name;
 273         int arg = 0;
 274
 275         if (!options)
 276                 return 0;
 277
 278         while ((p = strsep(&options, ",")) != NULL) {
 279                 int token;
 280                 if (!*p)
 281                         continue;
 282                 /*
 283                  * Initialize args struct so we know whether arg was
 284                  * found; some options take optional arguments.
 285                  */
 286                 args[0].to = args[0].from = NULL;
 287                 token = match_token(p, f2fs_tokens, args);
 288
 289                 switch (token) {
 290                 case Opt_gc_background:
 291                         name = match_strdup(&args[0]);
 292
 293                         if (!name)
 294                                 return -ENOMEM;
 295                         if (strlen(name) == 2 && !strncmp(name, "on", 2))
 296                                 set_opt(sbi, BG_GC);
 297                         else if (strlen(name) == 3 && !strncmp(name, "off", 3))
 298                                 clear_opt(sbi, BG_GC);
 299                         else {
 300                                 kfree(name);
 301                                 return -EINVAL;
 302                         }
 303                         kfree(name);
 304                         break;
 305                 case Opt_disable_roll_forward:
 306                         set_opt(sbi, DISABLE_ROLL_FORWARD);
 307                         break;
 308                 case Opt_norecovery:
 309                         /* this option mounts f2fs with ro */
 310                         set_opt(sbi, DISABLE_ROLL_FORWARD);
 311                         if (!f2fs_readonly(sb))
 312                                 return -EINVAL;
 313                         break;
 314                 case Opt_discard:
 315                         q = bdev_get_queue(sb->s_bdev);
 316                         if (blk_queue_discard(q)) {
 317                                 set_opt(sbi, DISCARD);
 318                         } else {
 319                                 f2fs_msg(sb, KERN_WARNING,
 320                                         "mounting with \"discard\" option, but "
 321                                         "the device does not support discard");
 322                         }
 323                         break;
 324                 case Opt_noheap:
 325                         set_opt(sbi, NOHEAP);
 326                         break;
 327 #ifdef CONFIG_F2FS_FS_XATTR
 328                 case Opt_user_xattr:
 329                         set_opt(sbi, XATTR_USER);
 330                         break;
 331                 case Opt_nouser_xattr:
 332                         clear_opt(sbi, XATTR_USER);
 333                         break;
 334                 case Opt_inline_xattr:
 335                         set_opt(sbi, INLINE_XATTR);
 336                         break;
 337 #else
 338                 case Opt_user_xattr:
 339                         f2fs_msg(sb, KERN_INFO,
 340                                 "user_xattr options not supported");
 341                         break;
 342                 case Opt_nouser_xattr:
 343                         f2fs_msg(sb, KERN_INFO,
 344                                 "nouser_xattr options not supported");
 345                         break;
 346                 case Opt_inline_xattr:
 347                         f2fs_msg(sb, KERN_INFO,
 348                                 "inline_xattr options not supported");
 349                         break;
 350 #endif
 351 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 352                 case Opt_acl:
 353                         set_opt(sbi, POSIX_ACL);
 354                         break;
 355                 case Opt_noacl:
 356                         clear_opt(sbi, POSIX_ACL);
 357                         break;
 358 #else
 359                 case Opt_acl:
 360                         f2fs_msg(sb, KERN_INFO, "acl options not supported");
 361                         break;
 362                 case Opt_noacl:
 363                         f2fs_msg(sb, KERN_INFO, "noacl options not supported");
 364                         break;
 365 #endif
 366                 case Opt_active_logs:
 367                         if (args->from && match_int(args, &arg))
 368                                 return -EINVAL;
 369                         if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
 370                                 return -EINVAL;
 371                         sbi->active_logs = arg;
 372                         break;
 373                 case Opt_disable_ext_identify:
 374                         set_opt(sbi, DISABLE_EXT_IDENTIFY);
 375                         break;
 376                 case Opt_inline_data:
 377                         set_opt(sbi, INLINE_DATA);
 378                         break;
 379                 case Opt_inline_dentry:
 380                         set_opt(sbi, INLINE_DENTRY);
 381                         break;
 382                 case Opt_flush_merge:
 383                         set_opt(sbi, FLUSH_MERGE);
 384                         break;
 385                 case Opt_nobarrier:
 386                         set_opt(sbi, NOBARRIER);
 387                         break;
 388                 case Opt_fastboot:
 389                         set_opt(sbi, FASTBOOT);
 390                         break;
 391                 case Opt_extent_cache:
 392                         set_opt(sbi, EXTENT_CACHE);
 393                         break;
 394                 case Opt_noextent_cache:
 395                         clear_opt(sbi, EXTENT_CACHE);
 396                         break;
 397                 case Opt_noinline_data:
 398                         clear_opt(sbi, INLINE_DATA);
 399                         break;
 400                 default:
 401                         f2fs_msg(sb, KERN_ERR,
 402                                 "Unrecognized mount option \"%s\" or missing value",
 403                                 p);
 404                         return -EINVAL;
 405                 }
 406         }
 407         return 0;
 408 }
 409
 410 static struct inode *f2fs_alloc_inode(struct super_block *sb)
 411 {
 412         struct f2fs_inode_info *fi;
 413
 414         fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
 415         if (!fi)
 416                 return NULL;
 417
 418         init_once((void *) fi);
 419
 420         /* Initialize f2fs-specific inode info */
 421         fi->vfs_inode.i_version = 1;
 422         atomic_set(&fi->dirty_pages, 0);
 423         fi->i_current_depth = 1;
 424         fi->i_advise = 0;
 425         init_rwsem(&fi->i_sem);
 426         INIT_LIST_HEAD(&fi->inmem_pages);
 427         mutex_init(&fi->inmem_lock);
 428
 429         set_inode_flag(fi, FI_NEW_INODE);
 430
 431         if (test_opt(F2FS_SB(sb), INLINE_XATTR))
 432                 set_inode_flag(fi, FI_INLINE_XATTR);
 433
 434         /* Will be used by directory only */
 435         fi->i_dir_level = F2FS_SB(sb)->dir_level;
 436
 437 #ifdef CONFIG_F2FS_FS_ENCRYPTION
 438         fi->i_crypt_info = NULL;
 439 #endif
 440         return &fi->vfs_inode;
 441 }
 442
 443 static int f2fs_drop_inode(struct inode *inode)
 444 {
 445         /*
 446          * This is to avoid a deadlock condition like below.
 447          * writeback_single_inode(inode)
 448          *  - f2fs_write_data_page
 449          *    - f2fs_gc -> iput -> evict
 450          *       - inode_wait_for_writeback(inode)
 451          */
 452         if (!inode_unhashed(inode) && inode->i_state & I_SYNC) {
 453                 if (!inode->i_nlink && !is_bad_inode(inode)) {
 454                         /* to avoid evict_inode call simultaneously */
 455                         atomic_inc(&inode->i_count);
 456                         spin_unlock(&inode->i_lock);
 457
 458                         /* some remained atomic pages should discarded */
 459                         if (f2fs_is_atomic_file(inode))
 460                                 commit_inmem_pages(inode, true);
 461
 462                         /* should remain fi->extent_tree for writepage */
 463                         f2fs_destroy_extent_node(inode);
 464
 465                         sb_start_intwrite(inode->i_sb);
 466                         i_size_write(inode, 0);
 467
 468                         if (F2FS_HAS_BLOCKS(inode))
 469                                 f2fs_truncate(inode, true);
 470
 471                         sb_end_intwrite(inode->i_sb);
 472
 473 #ifdef CONFIG_F2FS_FS_ENCRYPTION
 474                         if (F2FS_I(inode)->i_crypt_info)
 475                                 f2fs_free_encryption_info(inode,
 476                                         F2FS_I(inode)->i_crypt_info);
 477 #endif
 478                         spin_lock(&inode->i_lock);
 479                         atomic_dec(&inode->i_count);
 480                 }
 481                 return 0;
 482         }
 483         return generic_drop_inode(inode);
 484 }
 485
 486 /*
 487  * f2fs_dirty_inode() is called from __mark_inode_dirty()
 488  *
 489  * We should call set_dirty_inode to write the dirty inode through write_inode.
 490  */
 491 static void f2fs_dirty_inode(struct inode *inode, int flags)
 492 {
 493         set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
 494 }
 495
 496 static void f2fs_i_callback(struct rcu_head *head)
 497 {
 498         struct inode *inode = container_of(head, struct inode, i_rcu);
 499         kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
 500 }
 501
 502 static void f2fs_destroy_inode(struct inode *inode)
 503 {
 504         call_rcu(&inode->i_rcu, f2fs_i_callback);
 505 }
 506
 507 static void f2fs_put_super(struct super_block *sb)
 508 {
 509         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 510
 511         if (sbi->s_proc) {
 512                 remove_proc_entry("segment_info", sbi->s_proc);
 513                 remove_proc_entry(sb->s_id, f2fs_proc_root);
 514         }
 515         kobject_del(&sbi->s_kobj);
 516
 517         stop_gc_thread(sbi);
 518
 519         /* prevent remaining shrinker jobs */
 520         mutex_lock(&sbi->umount_mutex);
 521
 522         /*
 523          * We don't need to do checkpoint when superblock is clean.
 524          * But, the previous checkpoint was not done by umount, it needs to do
 525          * clean checkpoint again.
 526          */
 527         if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
 528                         !is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) {
 529                 struct cp_control cpc = {
 530                         .reason = CP_UMOUNT,
 531                 };
 532                 write_checkpoint(sbi, &cpc);
 533         }
 534
 535         /* write_checkpoint can update stat informaion */
 536         f2fs_destroy_stats(sbi);
 537
 538         /*
 539          * normally superblock is clean, so we need to release this.
 540          * In addition, EIO will skip do checkpoint, we need this as well.
 541          */
 542         release_dirty_inode(sbi);
 543         release_discard_addrs(sbi);
 544
 545         f2fs_leave_shrinker(sbi);
 546         mutex_unlock(&sbi->umount_mutex);
 547
 548         iput(sbi->node_inode);
 549         iput(sbi->meta_inode);
 550
 551         /* destroy f2fs internal modules */
 552         destroy_node_manager(sbi);
 553         destroy_segment_manager(sbi);
 554
 555         kfree(sbi->ckpt);
 556         kobject_put(&sbi->s_kobj);
 557         wait_for_completion(&sbi->s_kobj_unregister);
 558
 559         sb->s_fs_info = NULL;
 560         brelse(sbi->raw_super_buf);
 561         kfree(sbi);
 562 }
 563
 564 int f2fs_sync_fs(struct super_block *sb, int sync)
 565 {
 566         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 567
 568         trace_f2fs_sync_fs(sb, sync);
 569
 570         if (sync) {
 571                 struct cp_control cpc;
 572
 573                 cpc.reason = __get_cp_reason(sbi);
 574
 575                 mutex_lock(&sbi->gc_mutex);
 576                 write_checkpoint(sbi, &cpc);
 577                 mutex_unlock(&sbi->gc_mutex);
 578         } else {
 579                 f2fs_balance_fs(sbi);
 580         }
 581         f2fs_trace_ios(NULL, 1);
 582
 583         return 0;
 584 }
 585
 586 static int f2fs_freeze(struct super_block *sb)
 587 {
 588         int err;
 589
 590         if (f2fs_readonly(sb))
 591                 return 0;
 592
 593         err = f2fs_sync_fs(sb, 1);
 594         return err;
 595 }
 596
 597 static int f2fs_unfreeze(struct super_block *sb)
 598 {
 599         return 0;
 600 }
 601
 602 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
 603 {
 604         struct super_block *sb = dentry->d_sb;
 605         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 606         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 607         block_t total_count, user_block_count, start_count, ovp_count;
 608
 609         total_count = le64_to_cpu(sbi->raw_super->block_count);
 610         user_block_count = sbi->user_block_count;
 611         start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
 612         ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
 613         buf->f_type = F2FS_SUPER_MAGIC;
 614         buf->f_bsize = sbi->blocksize;
 615
 616         buf->f_blocks = total_count - start_count;
 617         buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
 618         buf->f_bavail = user_block_count - valid_user_blocks(sbi);
 619
 620         buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
 621         buf->f_ffree = buf->f_files - valid_inode_count(sbi);
 622
 623         buf->f_namelen = F2FS_NAME_LEN;
 624         buf->f_fsid.val[0] = (u32)id;
 625         buf->f_fsid.val[1] = (u32)(id >> 32);
 626
 627         return 0;
 628 }
 629
 630 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
 631 {
 632         struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
 633
 634         if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC))
 635                 seq_printf(seq, ",background_gc=%s", "on");
 636         else
 637                 seq_printf(seq, ",background_gc=%s", "off");
 638         if (test_opt(sbi, DISABLE_ROLL_FORWARD))
 639                 seq_puts(seq, ",disable_roll_forward");
 640         if (test_opt(sbi, DISCARD))
 641                 seq_puts(seq, ",discard");
 642         if (test_opt(sbi, NOHEAP))
 643                 seq_puts(seq, ",no_heap_alloc");
 644 #ifdef CONFIG_F2FS_FS_XATTR
 645         if (test_opt(sbi, XATTR_USER))
 646                 seq_puts(seq, ",user_xattr");
 647         else
 648                 seq_puts(seq, ",nouser_xattr");
 649         if (test_opt(sbi, INLINE_XATTR))
 650                 seq_puts(seq, ",inline_xattr");
 651 #endif
 652 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 653         if (test_opt(sbi, POSIX_ACL))
 654                 seq_puts(seq, ",acl");
 655         else
 656                 seq_puts(seq, ",noacl");
 657 #endif
 658         if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
 659                 seq_puts(seq, ",disable_ext_identify");
 660         if (test_opt(sbi, INLINE_DATA))
 661                 seq_puts(seq, ",inline_data");
 662         else
 663                 seq_puts(seq, ",noinline_data");
 664         if (test_opt(sbi, INLINE_DENTRY))
 665                 seq_puts(seq, ",inline_dentry");
 666         if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
 667                 seq_puts(seq, ",flush_merge");
 668         if (test_opt(sbi, NOBARRIER))
 669                 seq_puts(seq, ",nobarrier");
 670         if (test_opt(sbi, FASTBOOT))
 671                 seq_puts(seq, ",fastboot");
 672         if (test_opt(sbi, EXTENT_CACHE))
 673                 seq_puts(seq, ",extent_cache");
 674         else
 675                 seq_puts(seq, ",noextent_cache");
 676         seq_printf(seq, ",active_logs=%u", sbi->active_logs);
 677
 678         return 0;
 679 }
 680
 681 static int segment_info_seq_show(struct seq_file *seq, void *offset)
 682 {
 683         struct super_block *sb = seq->private;
 684         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 685         unsigned int total_segs =
 686                         le32_to_cpu(sbi->raw_super->segment_count_main);
 687         int i;
 688
 689         seq_puts(seq, "format: segment_type|valid_blocks\n"
 690                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
 691
 692         for (i = 0; i < total_segs; i++) {
 693                 struct seg_entry *se = get_seg_entry(sbi, i);
 694
 695                 if ((i % 10) == 0)
 696                         seq_printf(seq, "%-10d", i);
 697                 seq_printf(seq, "%d|%-3u", se->type,
 698                                         get_valid_blocks(sbi, i, 1));
 699                 if ((i % 10) == 9 || i == (total_segs - 1))
 700                         seq_putc(seq, '\n');
 701                 else
 702                         seq_putc(seq, ' ');
 703         }
 704
 705         return 0;
 706 }
 707
 708 static int segment_info_open_fs(struct inode *inode, struct file *file)
 709 {
 710         return single_open(file, segment_info_seq_show, PDE_DATA(inode));
 711 }
 712
 713 static const struct file_operations f2fs_seq_segment_info_fops = {
 714         .owner = THIS_MODULE,
 715         .open = segment_info_open_fs,
 716         .read = seq_read,
 717         .llseek = seq_lseek,
 718         .release = single_release,
 719 };
 720
 721 static void default_options(struct f2fs_sb_info *sbi)
 722 {
 723         /* init some FS parameters */
 724         sbi->active_logs = NR_CURSEG_TYPE;
 725
 726         set_opt(sbi, BG_GC);
 727         set_opt(sbi, INLINE_DATA);
 728         set_opt(sbi, EXTENT_CACHE);
 729
 730 #ifdef CONFIG_F2FS_FS_XATTR
 731         set_opt(sbi, XATTR_USER);
 732 #endif
 733 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 734         set_opt(sbi, POSIX_ACL);
 735 #endif
 736 }
 737
 738 static int f2fs_remount(struct super_block *sb, int *flags, char *data)
 739 {
 740         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 741         struct f2fs_mount_info org_mount_opt;
 742         int err, active_logs;
 743         bool need_restart_gc = false;
 744         bool need_stop_gc = false;
 745         bool no_extent_cache = !test_opt(sbi, EXTENT_CACHE);
 746
 747         sync_filesystem(sb);
 748
 749         /*
 750          * Save the old mount options in case we
 751          * need to restore them.
 752          */
 753         org_mount_opt = sbi->mount_opt;
 754         active_logs = sbi->active_logs;
 755
 756         sbi->mount_opt.opt = 0;
 757         default_options(sbi);
 758
 759         /* parse mount options */
 760         err = parse_options(sb, data);
 761         if (err)
 762                 goto restore_opts;
 763
 764         /*
 765          * Previous and new state of filesystem is RO,
 766          * so skip checking GC and FLUSH_MERGE conditions.
 767          */
 768         if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
 769                 goto skip;
 770
 771         /* disallow enable/disable extent_cache dynamically */
 772         if (no_extent_cache == !!test_opt(sbi, EXTENT_CACHE)) {
 773                 err = -EINVAL;
 774                 f2fs_msg(sbi->sb, KERN_WARNING,
 775                                 "switch extent_cache option is not allowed");
 776                 goto restore_opts;
 777         }
 778
 779         /*
 780          * We stop the GC thread if FS is mounted as RO
 781          * or if background_gc = off is passed in mount
 782          * option. Also sync the filesystem.
 783          */
 784         if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
 785                 if (sbi->gc_thread) {
 786                         stop_gc_thread(sbi);
 787                         f2fs_sync_fs(sb, 1);
 788                         need_restart_gc = true;
 789                 }
 790         } else if (!sbi->gc_thread) {
 791                 err = start_gc_thread(sbi);
 792                 if (err)
 793                         goto restore_opts;
 794                 need_stop_gc = true;
 795         }
 796
 797         /*
 798          * We stop issue flush thread if FS is mounted as RO
 799          * or if flush_merge is not passed in mount option.
 800          */
 801         if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
 802                 destroy_flush_cmd_control(sbi);
 803         } else if (!SM_I(sbi)->cmd_control_info) {
 804                 err = create_flush_cmd_control(sbi);
 805                 if (err)
 806                         goto restore_gc;
 807         }
 808 skip:
 809         /* Update the POSIXACL Flag */
 810          sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 811                 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
 812         return 0;
 813 restore_gc:
 814         if (need_restart_gc) {
 815                 if (start_gc_thread(sbi))
 816                         f2fs_msg(sbi->sb, KERN_WARNING,
 817                                 "background gc thread has stopped");
 818         } else if (need_stop_gc) {
 819                 stop_gc_thread(sbi);
 820         }
 821 restore_opts:
 822         sbi->mount_opt = org_mount_opt;
 823         sbi->active_logs = active_logs;
 824         return err;
 825 }
 826
 827 static struct super_operations f2fs_sops = {
 828         .alloc_inode    = f2fs_alloc_inode,
 829         .drop_inode     = f2fs_drop_inode,
 830         .destroy_inode  = f2fs_destroy_inode,
 831         .write_inode    = f2fs_write_inode,
 832         .dirty_inode    = f2fs_dirty_inode,
 833         .show_options   = f2fs_show_options,
 834         .evict_inode    = f2fs_evict_inode,
 835         .put_super      = f2fs_put_super,
 836         .sync_fs        = f2fs_sync_fs,
 837         .freeze_fs      = f2fs_freeze,
 838         .unfreeze_fs    = f2fs_unfreeze,
 839         .statfs         = f2fs_statfs,
 840         .remount_fs     = f2fs_remount,
 841 };
 842
 843 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
 844                 u64 ino, u32 generation)
 845 {
 846         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 847         struct inode *inode;
 848
 849         if (check_nid_range(sbi, ino))
 850                 return ERR_PTR(-ESTALE);
 851
 852         /*
 853          * f2fs_iget isn't quite right if the inode is currently unallocated!
 854          * However f2fs_iget currently does appropriate checks to handle stale
 855          * inodes so everything is OK.
 856          */
 857         inode = f2fs_iget(sb, ino);
 858         if (IS_ERR(inode))
 859                 return ERR_CAST(inode);
 860         if (unlikely(generation && inode->i_generation != generation)) {
 861                 /* we didn't find the right inode.. */
 862                 iput(inode);
 863                 return ERR_PTR(-ESTALE);
 864         }
 865         return inode;
 866 }
 867
 868 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
 869                 int fh_len, int fh_type)
 870 {
 871         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 872                                     f2fs_nfs_get_inode);
 873 }
 874
 875 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
 876                 int fh_len, int fh_type)
 877 {
 878         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 879                                     f2fs_nfs_get_inode);
 880 }
 881
 882 static const struct export_operations f2fs_export_ops = {
 883         .fh_to_dentry = f2fs_fh_to_dentry,
 884         .fh_to_parent = f2fs_fh_to_parent,
 885         .get_parent = f2fs_get_parent,
 886 };
 887
 888 static loff_t max_file_size(unsigned bits)
 889 {
 890         loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
 891         loff_t leaf_count = ADDRS_PER_BLOCK;
 892
 893         /* two direct node blocks */
 894         result += (leaf_count * 2);
 895
 896         /* two indirect node blocks */
 897         leaf_count *= NIDS_PER_BLOCK;
 898         result += (leaf_count * 2);
 899
 900         /* one double indirect node block */
 901         leaf_count *= NIDS_PER_BLOCK;
 902         result += leaf_count;
 903
 904         result <<= bits;
 905         return result;
 906 }
 907
 908 static int sanity_check_raw_super(struct super_block *sb,
 909                         struct f2fs_super_block *raw_super)
 910 {
 911         unsigned int blocksize;
 912
 913         if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
 914                 f2fs_msg(sb, KERN_INFO,
 915                         "Magic Mismatch, valid(0x%x) - read(0x%x)",
 916                         F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
 917                 return 1;
 918         }
 919
 920         /* Currently, support only 4KB page cache size */
 921         if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
 922                 f2fs_msg(sb, KERN_INFO,
 923                         "Invalid page_cache_size (%lu), supports only 4KB\n",
 924                         PAGE_CACHE_SIZE);
 925                 return 1;
 926         }
 927
 928         /* Currently, support only 4KB block size */
 929         blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
 930         if (blocksize != F2FS_BLKSIZE) {
 931                 f2fs_msg(sb, KERN_INFO,
 932                         "Invalid blocksize (%u), supports only 4KB\n",
 933                         blocksize);
 934                 return 1;
 935         }
 936
 937         /* Currently, support 512/1024/2048/4096 bytes sector size */
 938         if (le32_to_cpu(raw_super->log_sectorsize) >
 939                                 F2FS_MAX_LOG_SECTOR_SIZE ||
 940                 le32_to_cpu(raw_super->log_sectorsize) <
 941                                 F2FS_MIN_LOG_SECTOR_SIZE) {
 942                 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)",
 943                         le32_to_cpu(raw_super->log_sectorsize));
 944                 return 1;
 945         }
 946         if (le32_to_cpu(raw_super->log_sectors_per_block) +
 947                 le32_to_cpu(raw_super->log_sectorsize) !=
 948                         F2FS_MAX_LOG_SECTOR_SIZE) {
 949                 f2fs_msg(sb, KERN_INFO,
 950                         "Invalid log sectors per block(%u) log sectorsize(%u)",
 951                         le32_to_cpu(raw_super->log_sectors_per_block),
 952                         le32_to_cpu(raw_super->log_sectorsize));
 953                 return 1;
 954         }
 955         return 0;
 956 }
 957
 958 static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
 959 {
 960         unsigned int total, fsmeta;
 961         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
 962         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 963
 964         total = le32_to_cpu(raw_super->segment_count);
 965         fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
 966         fsmeta += le32_to_cpu(raw_super->segment_count_sit);
 967         fsmeta += le32_to_cpu(raw_super->segment_count_nat);
 968         fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
 969         fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
 970
 971         if (unlikely(fsmeta >= total))
 972                 return 1;
 973
 974         if (unlikely(f2fs_cp_error(sbi))) {
 975                 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
 976                 return 1;
 977         }
 978         return 0;
 979 }
 980
 981 static void init_sb_info(struct f2fs_sb_info *sbi)
 982 {
 983         struct f2fs_super_block *raw_super = sbi->raw_super;
 984         int i;
 985
 986         sbi->log_sectors_per_block =
 987                 le32_to_cpu(raw_super->log_sectors_per_block);
 988         sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
 989         sbi->blocksize = 1 << sbi->log_blocksize;
 990         sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
 991         sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
 992         sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
 993         sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
 994         sbi->total_sections = le32_to_cpu(raw_super->section_count);
 995         sbi->total_node_count =
 996                 (le32_to_cpu(raw_super->segment_count_nat) / 2)
 997                         * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
 998         sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
 999         sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
1000         sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
1001         sbi->cur_victim_sec = NULL_SECNO;
1002         sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
1003
1004         for (i = 0; i < NR_COUNT_TYPE; i++)
1005                 atomic_set(&sbi->nr_pages[i], 0);
1006
1007         sbi->dir_level = DEF_DIR_LEVEL;
1008         clear_sbi_flag(sbi, SBI_NEED_FSCK);
1009
1010         INIT_LIST_HEAD(&sbi->s_list);
1011         mutex_init(&sbi->umount_mutex);
1012 }
1013
1014 /*
1015  * Read f2fs raw super block.
1016  * Because we have two copies of super block, so read the first one at first,
1017  * if the first one is invalid, move to read the second one.
1018  */
1019 static int read_raw_super_block(struct super_block *sb,
1020                         struct f2fs_super_block **raw_super,
1021                         struct buffer_head **raw_super_buf,
1022                         int *recovery)
1023 {
1024         int block = 0;
1025         struct buffer_head *buffer;
1026         struct f2fs_super_block *super;
1027         int err = 0;
1028
1029 retry:
1030         buffer = sb_bread(sb, block);
1031         if (!buffer) {
1032                 *recovery = 1;
1033                 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
1034                                 block + 1);
1035                 if (block == 0) {
1036                         block++;
1037                         goto retry;
1038                 } else {
1039                         err = -EIO;
1040                         goto out;
1041                 }
1042         }
1043
1044         super = (struct f2fs_super_block *)
1045                 ((char *)(buffer)->b_data + F2FS_SUPER_OFFSET);
1046
1047         /* sanity checking of raw super */
1048         if (sanity_check_raw_super(sb, super)) {
1049                 brelse(buffer);
1050                 *recovery = 1;
1051                 f2fs_msg(sb, KERN_ERR,
1052                         "Can't find valid F2FS filesystem in %dth superblock",
1053                                                                 block + 1);
1054                 if (block == 0) {
1055                         block++;
1056                         goto retry;
1057                 } else {
1058                         err = -EINVAL;
1059                         goto out;
1060                 }
1061         }
1062
1063         if (!*raw_super) {
1064                 *raw_super_buf = buffer;
1065                 *raw_super = super;
1066         } else {
1067                 /* already have a valid superblock */
1068                 brelse(buffer);
1069         }
1070
1071         /* check the validity of the second superblock */
1072         if (block == 0) {
1073                 block++;
1074                 goto retry;
1075         }
1076
1077 out:
1078         /* No valid superblock */
1079         if (!*raw_super)
1080                 return err;
1081
1082         return 0;
1083 }
1084
1085 int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover)
1086 {
1087         struct buffer_head *sbh = sbi->raw_super_buf;
1088         sector_t block = sbh->b_blocknr;
1089         int err;
1090
1091         /* write back-up superblock first */
1092         sbh->b_blocknr = block ? 0 : 1;
1093         mark_buffer_dirty(sbh);
1094         err = sync_dirty_buffer(sbh);
1095
1096         sbh->b_blocknr = block;
1097
1098         /* if we are in recovery path, skip writing valid superblock */
1099         if (recover || err)
1100                 goto out;
1101
1102         /* write current valid superblock */
1103         mark_buffer_dirty(sbh);
1104         err = sync_dirty_buffer(sbh);
1105 out:
1106         clear_buffer_write_io_error(sbh);
1107         set_buffer_uptodate(sbh);
1108         return err;
1109 }
1110
1111 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
1112 {
1113         struct f2fs_sb_info *sbi;
1114         struct f2fs_super_block *raw_super;
1115         struct buffer_head *raw_super_buf;
1116         struct inode *root;
1117         long err;
1118         bool retry = true, need_fsck = false;
1119         char *options = NULL;
1120         int recovery, i;
1121
1122 try_onemore:
1123         err = -EINVAL;
1124         raw_super = NULL;
1125         raw_super_buf = NULL;
1126         recovery = 0;
1127
1128         /* allocate memory for f2fs-specific super block info */
1129         sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
1130         if (!sbi)
1131                 return -ENOMEM;
1132
1133         /* set a block size */
1134         if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
1135                 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
1136                 goto free_sbi;
1137         }
1138
1139         err = read_raw_super_block(sb, &raw_super, &raw_super_buf, &recovery);
1140         if (err)
1141                 goto free_sbi;
1142
1143         sb->s_fs_info = sbi;
1144         default_options(sbi);
1145         /* parse mount options */
1146         options = kstrdup((const char *)data, GFP_KERNEL);
1147         if (data && !options) {
1148                 err = -ENOMEM;
1149                 goto free_sb_buf;
1150         }
1151
1152         err = parse_options(sb, options);
1153         if (err)
1154                 goto free_options;
1155
1156         sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
1157         sb->s_max_links = F2FS_LINK_MAX;
1158         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1159
1160         sb->s_op = &f2fs_sops;
1161         sb->s_xattr = f2fs_xattr_handlers;
1162         sb->s_export_op = &f2fs_export_ops;
1163         sb->s_magic = F2FS_SUPER_MAGIC;
1164         sb->s_time_gran = 1;
1165         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1166                 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
1167         memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
1168
1169         /* init f2fs-specific super block info */
1170         sbi->sb = sb;
1171         sbi->raw_super = raw_super;
1172         sbi->raw_super_buf = raw_super_buf;
1173         mutex_init(&sbi->gc_mutex);
1174         mutex_init(&sbi->writepages);
1175         mutex_init(&sbi->cp_mutex);
1176         init_rwsem(&sbi->node_write);
1177
1178         /* disallow all the data/node/meta page writes */
1179         set_sbi_flag(sbi, SBI_POR_DOING);
1180         spin_lock_init(&sbi->stat_lock);
1181
1182         init_rwsem(&sbi->read_io.io_rwsem);
1183         sbi->read_io.sbi = sbi;
1184         sbi->read_io.bio = NULL;
1185         for (i = 0; i < NR_PAGE_TYPE; i++) {
1186                 init_rwsem(&sbi->write_io[i].io_rwsem);
1187                 sbi->write_io[i].sbi = sbi;
1188                 sbi->write_io[i].bio = NULL;
1189         }
1190
1191         init_rwsem(&sbi->cp_rwsem);
1192         init_waitqueue_head(&sbi->cp_wait);
1193         init_sb_info(sbi);
1194
1195         /* get an inode for meta space */
1196         sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
1197         if (IS_ERR(sbi->meta_inode)) {
1198                 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
1199                 err = PTR_ERR(sbi->meta_inode);
1200                 goto free_options;
1201         }
1202
1203         err = get_valid_checkpoint(sbi);
1204         if (err) {
1205                 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
1206                 goto free_meta_inode;
1207         }
1208
1209         /* sanity checking of checkpoint */
1210         err = -EINVAL;
1211         if (sanity_check_ckpt(sbi)) {
1212                 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
1213                 goto free_cp;
1214         }
1215
1216         sbi->total_valid_node_count =
1217                                 le32_to_cpu(sbi->ckpt->valid_node_count);
1218         sbi->total_valid_inode_count =
1219                                 le32_to_cpu(sbi->ckpt->valid_inode_count);
1220         sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
1221         sbi->total_valid_block_count =
1222                                 le64_to_cpu(sbi->ckpt->valid_block_count);
1223         sbi->last_valid_block_count = sbi->total_valid_block_count;
1224         sbi->alloc_valid_block_count = 0;
1225         INIT_LIST_HEAD(&sbi->dir_inode_list);
1226         spin_lock_init(&sbi->dir_inode_lock);
1227
1228         init_extent_cache_info(sbi);
1229
1230         init_ino_entry_info(sbi);
1231
1232         /* setup f2fs internal modules */
1233         err = build_segment_manager(sbi);
1234         if (err) {
1235                 f2fs_msg(sb, KERN_ERR,
1236                         "Failed to initialize F2FS segment manager");
1237                 goto free_sm;
1238         }
1239         err = build_node_manager(sbi);
1240         if (err) {
1241                 f2fs_msg(sb, KERN_ERR,
1242                         "Failed to initialize F2FS node manager");
1243                 goto free_nm;
1244         }
1245
1246         build_gc_manager(sbi);
1247
1248         /* get an inode for node space */
1249         sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
1250         if (IS_ERR(sbi->node_inode)) {
1251                 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
1252                 err = PTR_ERR(sbi->node_inode);
1253                 goto free_nm;
1254         }
1255
1256         f2fs_join_shrinker(sbi);
1257
1258         /* if there are nt orphan nodes free them */
1259         err = recover_orphan_inodes(sbi);
1260         if (err)
1261                 goto free_node_inode;
1262
1263         /* read root inode and dentry */
1264         root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
1265         if (IS_ERR(root)) {
1266                 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
1267                 err = PTR_ERR(root);
1268                 goto free_node_inode;
1269         }
1270         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1271                 iput(root);
1272                 err = -EINVAL;
1273                 goto free_node_inode;
1274         }
1275
1276         sb->s_root = d_make_root(root); /* allocate root dentry */
1277         if (!sb->s_root) {
1278                 err = -ENOMEM;
1279                 goto free_root_inode;
1280         }
1281
1282         err = f2fs_build_stats(sbi);
1283         if (err)
1284                 goto free_root_inode;
1285
1286         if (f2fs_proc_root)
1287                 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
1288
1289         if (sbi->s_proc)
1290                 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
1291                                  &f2fs_seq_segment_info_fops, sb);
1292
1293         sbi->s_kobj.kset = f2fs_kset;
1294         init_completion(&sbi->s_kobj_unregister);
1295         err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1296                                                         "%s", sb->s_id);
1297         if (err)
1298                 goto free_proc;
1299
1300         /* recover fsynced data */
1301         if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1302                 /*
1303                  * mount should be failed, when device has readonly mode, and
1304                  * previous checkpoint was not done by clean system shutdown.
1305                  */
1306                 if (bdev_read_only(sb->s_bdev) &&
1307                                 !is_set_ckpt_flags(sbi->ckpt, CP_UMOUNT_FLAG)) {
1308                         err = -EROFS;
1309                         goto free_kobj;
1310                 }
1311
1312                 if (need_fsck)
1313                         set_sbi_flag(sbi, SBI_NEED_FSCK);
1314
1315                 err = recover_fsync_data(sbi);
1316                 if (err) {
1317                         need_fsck = true;
1318                         f2fs_msg(sb, KERN_ERR,
1319                                 "Cannot recover all fsync data errno=%ld", err);
1320                         goto free_kobj;
1321                 }
1322         }
1323         /* recover_fsync_data() cleared this already */
1324         clear_sbi_flag(sbi, SBI_POR_DOING);
1325
1326         /*
1327          * If filesystem is not mounted as read-only then
1328          * do start the gc_thread.
1329          */
1330         if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) {
1331                 /* After POR, we can run background GC thread.*/
1332                 err = start_gc_thread(sbi);
1333                 if (err)
1334                         goto free_kobj;
1335         }
1336         kfree(options);
1337
1338         /* recover broken superblock */
1339         if (recovery && !f2fs_readonly(sb) && !bdev_read_only(sb->s_bdev)) {
1340                 f2fs_msg(sb, KERN_INFO, "Recover invalid superblock");
1341                 f2fs_commit_super(sbi, true);
1342         }
1343
1344         return 0;
1345
1346 free_kobj:
1347         kobject_del(&sbi->s_kobj);
1348 free_proc:
1349         if (sbi->s_proc) {
1350                 remove_proc_entry("segment_info", sbi->s_proc);
1351                 remove_proc_entry(sb->s_id, f2fs_proc_root);
1352         }
1353         f2fs_destroy_stats(sbi);
1354 free_root_inode:
1355         dput(sb->s_root);
1356         sb->s_root = NULL;
1357 free_node_inode:
1358         mutex_lock(&sbi->umount_mutex);
1359         f2fs_leave_shrinker(sbi);
1360         iput(sbi->node_inode);
1361         mutex_unlock(&sbi->umount_mutex);
1362 free_nm:
1363         destroy_node_manager(sbi);
1364 free_sm:
1365         destroy_segment_manager(sbi);
1366 free_cp:
1367         kfree(sbi->ckpt);
1368 free_meta_inode:
1369         make_bad_inode(sbi->meta_inode);
1370         iput(sbi->meta_inode);
1371 free_options:
1372         kfree(options);
1373 free_sb_buf:
1374         brelse(raw_super_buf);
1375 free_sbi:
1376         kfree(sbi);
1377
1378         /* give only one another chance */
1379         if (retry) {
1380                 retry = false;
1381                 shrink_dcache_sb(sb);
1382                 goto try_onemore;
1383         }
1384         return err;
1385 }
1386
1387 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
1388                         const char *dev_name, void *data)
1389 {
1390         return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
1391 }
1392
1393 static void kill_f2fs_super(struct super_block *sb)
1394 {
1395         if (sb->s_root)
1396                 set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE);
1397         kill_block_super(sb);
1398 }
1399
1400 static struct file_system_type f2fs_fs_type = {
1401         .owner          = THIS_MODULE,
1402         .name           = "f2fs",
1403         .mount          = f2fs_mount,
1404         .kill_sb        = kill_f2fs_super,
1405         .fs_flags       = FS_REQUIRES_DEV,
1406 };
1407 MODULE_ALIAS_FS("f2fs");
1408
1409 static int __init init_inodecache(void)
1410 {
1411         f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
1412                         sizeof(struct f2fs_inode_info));
1413         if (!f2fs_inode_cachep)
1414                 return -ENOMEM;
1415         return 0;
1416 }
1417
1418 static void destroy_inodecache(void)
1419 {
1420         /*
1421          * Make sure all delayed rcu free inodes are flushed before we
1422          * destroy cache.
1423          */
1424         rcu_barrier();
1425         kmem_cache_destroy(f2fs_inode_cachep);
1426 }
1427
1428 static int __init init_f2fs_fs(void)
1429 {
1430         int err;
1431
1432         f2fs_build_trace_ios();
1433
1434         err = init_inodecache();
1435         if (err)
1436                 goto fail;
1437         err = create_node_manager_caches();
1438         if (err)
1439                 goto free_inodecache;
1440         err = create_segment_manager_caches();
1441         if (err)
1442                 goto free_node_manager_caches;
1443         err = create_checkpoint_caches();
1444         if (err)
1445                 goto free_segment_manager_caches;
1446         err = create_extent_cache();
1447         if (err)
1448                 goto free_checkpoint_caches;
1449         f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
1450         if (!f2fs_kset) {
1451                 err = -ENOMEM;
1452                 goto free_extent_cache;
1453         }
1454         err = f2fs_init_crypto();
1455         if (err)
1456                 goto free_kset;
1457
1458         err = register_shrinker(&f2fs_shrinker_info);
1459         if (err)
1460                 goto free_crypto;
1461
1462         err = register_filesystem(&f2fs_fs_type);
1463         if (err)
1464                 goto free_shrinker;
1465         f2fs_create_root_stats();
1466         f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1467         return 0;
1468
1469 free_shrinker:
1470         unregister_shrinker(&f2fs_shrinker_info);
1471 free_crypto:
1472         f2fs_exit_crypto();
1473 free_kset:
1474         kset_unregister(f2fs_kset);
1475 free_extent_cache:
1476         destroy_extent_cache();
1477 free_checkpoint_caches:
1478         destroy_checkpoint_caches();
1479 free_segment_manager_caches:
1480         destroy_segment_manager_caches();
1481 free_node_manager_caches:
1482         destroy_node_manager_caches();
1483 free_inodecache:
1484         destroy_inodecache();
1485 fail:
1486         return err;
1487 }
1488
1489 static void __exit exit_f2fs_fs(void)
1490 {
1491         remove_proc_entry("fs/f2fs", NULL);
1492         f2fs_destroy_root_stats();
1493         unregister_shrinker(&f2fs_shrinker_info);
1494         unregister_filesystem(&f2fs_fs_type);
1495         f2fs_exit_crypto();
1496         destroy_extent_cache();
1497         destroy_checkpoint_caches();
1498         destroy_segment_manager_caches();
1499         destroy_node_manager_caches();
1500         destroy_inodecache();
1501         kset_unregister(f2fs_kset);
1502         f2fs_destroy_trace_ios();
1503 }
1504
1505 module_init(init_f2fs_fs)
1506 module_exit(exit_f2fs_fs)
1507
1508 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1509 MODULE_DESCRIPTION("Flash Friendly File System");
1510 MODULE_LICENSE("GPL");