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