fs/f2fs/super.c

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