fs/f2fs/super.c

   1 /*
   2  * fs/f2fs/super.c
   3  *
   4  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
   5  *             http://www.samsung.com/
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/module.h>
  12 #include <linux/init.h>
  13 #include <linux/fs.h>
  14 #include <linux/statfs.h>
  15 #include <linux/buffer_head.h>
  16 #include <linux/backing-dev.h>
  17 #include <linux/kthread.h>
  18 #include <linux/parser.h>
  19 #include <linux/mount.h>
  20 #include <linux/seq_file.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/random.h>
  23 #include <linux/exportfs.h>
  24 #include <linux/blkdev.h>
  25 #include <linux/f2fs_fs.h>
  26 #include <linux/sysfs.h>
  27
  28 #include "f2fs.h"
  29 #include "node.h"
  30 #include "segment.h"
  31 #include "xattr.h"
  32 #include "gc.h"
  33 #include "trace.h"
  34
  35 #define CREATE_TRACE_POINTS
  36 #include <trace/events/f2fs.h>
  37
  38 static struct proc_dir_entry *f2fs_proc_root;
  39 static struct kmem_cache *f2fs_inode_cachep;
  40 static struct kset *f2fs_kset;
  41
  42 /* f2fs-wide shrinker description */
  43 static struct shrinker f2fs_shrinker_info = {
  44         .scan_objects = f2fs_shrink_scan,
  45         .count_objects = f2fs_shrink_count,
  46         .seeks = DEFAULT_SEEKS,
  47 };
  48
  49 enum {
  50         Opt_gc_background,
  51         Opt_disable_roll_forward,
  52         Opt_norecovery,
  53         Opt_discard,
  54         Opt_noheap,
  55         Opt_user_xattr,
  56         Opt_nouser_xattr,
  57         Opt_acl,
  58         Opt_noacl,
  59         Opt_active_logs,
  60         Opt_disable_ext_identify,
  61         Opt_inline_xattr,
  62         Opt_inline_data,
  63         Opt_inline_dentry,
  64         Opt_flush_merge,
  65         Opt_nobarrier,
  66         Opt_fastboot,
  67         Opt_extent_cache,
  68         Opt_noextent_cache,
  69         Opt_noinline_data,
  70         Opt_err,
  71 };
  72
  73 static match_table_t f2fs_tokens = {
  74         {Opt_gc_background, "background_gc=%s"},
  75         {Opt_disable_roll_forward, "disable_roll_forward"},
  76         {Opt_norecovery, "norecovery"},
  77         {Opt_discard, "discard"},
  78         {Opt_noheap, "no_heap"},
  79         {Opt_user_xattr, "user_xattr"},
  80         {Opt_nouser_xattr, "nouser_xattr"},
  81         {Opt_acl, "acl"},
  82         {Opt_noacl, "noacl"},
  83         {Opt_active_logs, "active_logs=%u"},
  84         {Opt_disable_ext_identify, "disable_ext_identify"},
  85         {Opt_inline_xattr, "inline_xattr"},
  86         {Opt_inline_data, "inline_data"},
  87         {Opt_inline_dentry, "inline_dentry"},
  88         {Opt_flush_merge, "flush_merge"},
  89         {Opt_nobarrier, "nobarrier"},
  90         {Opt_fastboot, "fastboot"},
  91         {Opt_extent_cache, "extent_cache"},
  92         {Opt_noextent_cache, "noextent_cache"},
  93         {Opt_noinline_data, "noinline_data"},
  94         {Opt_err, NULL},
  95 };
  96
  97 /* Sysfs support for f2fs */
  98 enum {
  99         GC_THREAD,      /* struct f2fs_gc_thread */
 100         SM_INFO,        /* struct f2fs_sm_info */
 101         NM_INFO,        /* struct f2fs_nm_info */
 102         F2FS_SBI,       /* struct f2fs_sb_info */
 103 };
 104
 105 struct f2fs_attr {
 106         struct attribute attr;
 107         ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
 108         ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
 109                          const char *, size_t);
 110         int struct_type;
 111         int offset;
 112 };
 113
 114 static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
 115 {
 116         if (struct_type == GC_THREAD)
 117                 return (unsigned char *)sbi->gc_thread;
 118         else if (struct_type == SM_INFO)
 119                 return (unsigned char *)SM_I(sbi);
 120         else if (struct_type == NM_INFO)
 121                 return (unsigned char *)NM_I(sbi);
 122         else if (struct_type == F2FS_SBI)
 123                 return (unsigned char *)sbi;
 124         return NULL;
 125 }
 126
 127 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
 128                         struct f2fs_sb_info *sbi, char *buf)
 129 {
 130         unsigned char *ptr = NULL;
 131         unsigned int *ui;
 132
 133         ptr = __struct_ptr(sbi, a->struct_type);
 134         if (!ptr)
 135                 return -EINVAL;
 136
 137         ui = (unsigned int *)(ptr + a->offset);
 138
 139         return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
 140 }
 141
 142 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
 143                         struct f2fs_sb_info *sbi,
 144                         const char *buf, size_t count)
 145 {
 146         unsigned char *ptr;
 147         unsigned long t;
 148         unsigned int *ui;
 149         ssize_t ret;
 150
 151         ptr = __struct_ptr(sbi, a->struct_type);
 152         if (!ptr)
 153                 return -EINVAL;
 154
 155         ui = (unsigned int *)(ptr + a->offset);
 156
 157         ret = kstrtoul(skip_spaces(buf), 0, &t);
 158         if (ret < 0)
 159                 return ret;
 160         *ui = t;
 161         return count;
 162 }
 163
 164 static ssize_t f2fs_attr_show(struct kobject *kobj,
 165                                 struct attribute *attr, char *buf)
 166 {
 167         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 168                                                                 s_kobj);
 169         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 170
 171         return a->show ? a->show(a, sbi, buf) : 0;
 172 }
 173
 174 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
 175                                                 const char *buf, size_t len)
 176 {
 177         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 178                                                                         s_kobj);
 179         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 180
 181         return a->store ? a->store(a, sbi, buf, len) : 0;
 182 }
 183
 184 static void f2fs_sb_release(struct kobject *kobj)
 185 {
 186         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 187                                                                 s_kobj);
 188         complete(&sbi->s_kobj_unregister);
 189 }
 190
 191 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
 192 static struct f2fs_attr f2fs_attr_##_name = {                   \
 193         .attr = {.name = __stringify(_name), .mode = _mode },   \
 194         .show   = _show,                                        \
 195         .store  = _store,                                       \
 196         .struct_type = _struct_type,                            \
 197         .offset = _offset                                       \
 198 }
 199
 200 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname)    \
 201         F2FS_ATTR_OFFSET(struct_type, name, 0644,               \
 202                 f2fs_sbi_show, f2fs_sbi_store,                  \
 203                 offsetof(struct struct_name, elname))
 204
 205 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
 206 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
 207 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
 208 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
 209 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
 210 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
 211 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
 212 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
 213 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
 214 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
 215 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
 216 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages);
 217 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
 218 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
 219 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, cp_interval);
 220
 221 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
 222 static struct attribute *f2fs_attrs[] = {
 223         ATTR_LIST(gc_min_sleep_time),
 224         ATTR_LIST(gc_max_sleep_time),
 225         ATTR_LIST(gc_no_gc_sleep_time),
 226         ATTR_LIST(gc_idle),
 227         ATTR_LIST(reclaim_segments),
 228         ATTR_LIST(max_small_discards),
 229         ATTR_LIST(batched_trim_sections),
 230         ATTR_LIST(ipu_policy),
 231         ATTR_LIST(min_ipu_util),
 232         ATTR_LIST(min_fsync_blocks),
 233         ATTR_LIST(max_victim_search),
 234         ATTR_LIST(dir_level),
 235         ATTR_LIST(ram_thresh),
 236         ATTR_LIST(ra_nid_pages),
 237         ATTR_LIST(cp_interval),
 238         NULL,
 239 };
 240
 241 static const struct sysfs_ops f2fs_attr_ops = {
 242         .show   = f2fs_attr_show,
 243         .store  = f2fs_attr_store,
 244 };
 245
 246 static struct kobj_type f2fs_ktype = {
 247         .default_attrs  = f2fs_attrs,
 248         .sysfs_ops      = &f2fs_attr_ops,
 249         .release        = f2fs_sb_release,
 250 };
 251
 252 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
 253 {
 254         struct va_format vaf;
 255         va_list args;
 256
 257         va_start(args, fmt);
 258         vaf.fmt = fmt;
 259         vaf.va = &args;
 260         printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
 261         va_end(args);
 262 }
 263
 264 static void init_once(void *foo)
 265 {
 266         struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
 267
 268         inode_init_once(&fi->vfs_inode);
 269 }
 270
 271 static int parse_options(struct super_block *sb, char *options)
 272 {
 273         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 274         struct request_queue *q;
 275         substring_t args[MAX_OPT_ARGS];
 276         char *p, *name;
 277         int arg = 0;
 278
 279         if (!options)
 280                 return 0;
 281
 282         while ((p = strsep(&options, ",")) != NULL) {
 283                 int token;
 284                 if (!*p)
 285                         continue;
 286                 /*
 287                  * Initialize args struct so we know whether arg was
 288                  * found; some options take optional arguments.
 289                  */
 290                 args[0].to = args[0].from = NULL;
 291                 token = match_token(p, f2fs_tokens, args);
 292
 293                 switch (token) {
 294                 case Opt_gc_background:
 295                         name = match_strdup(&args[0]);
 296
 297                         if (!name)
 298                                 return -ENOMEM;
 299                         if (strlen(name) == 2 && !strncmp(name, "on", 2)) {
 300                                 set_opt(sbi, BG_GC);
 301                                 clear_opt(sbi, FORCE_FG_GC);
 302                         } else if (strlen(name) == 3 && !strncmp(name, "off", 3)) {
 303                                 clear_opt(sbi, BG_GC);
 304                                 clear_opt(sbi, FORCE_FG_GC);
 305                         } else if (strlen(name) == 4 && !strncmp(name, "sync", 4)) {
 306                                 set_opt(sbi, BG_GC);
 307                                 set_opt(sbi, FORCE_FG_GC);
 308                         } else {
 309                                 kfree(name);
 310                                 return -EINVAL;
 311                         }
 312                         kfree(name);
 313                         break;
 314                 case Opt_disable_roll_forward:
 315                         set_opt(sbi, DISABLE_ROLL_FORWARD);
 316                         break;
 317                 case Opt_norecovery:
 318                         /* this option mounts f2fs with ro */
 319                         set_opt(sbi, DISABLE_ROLL_FORWARD);
 320                         if (!f2fs_readonly(sb))
 321                                 return -EINVAL;
 322                         break;
 323                 case Opt_discard:
 324                         q = bdev_get_queue(sb->s_bdev);
 325                         if (blk_queue_discard(q)) {
 326                                 set_opt(sbi, DISCARD);
 327                         } else {
 328                                 f2fs_msg(sb, KERN_WARNING,
 329                                         "mounting with \"discard\" option, but "
 330                                         "the device does not support discard");
 331                         }
 332                         break;
 333                 case Opt_noheap:
 334                         set_opt(sbi, NOHEAP);
 335                         break;
 336 #ifdef CONFIG_F2FS_FS_XATTR
 337                 case Opt_user_xattr:
 338                         set_opt(sbi, XATTR_USER);
 339                         break;
 340                 case Opt_nouser_xattr:
 341                         clear_opt(sbi, XATTR_USER);
 342                         break;
 343                 case Opt_inline_xattr:
 344                         set_opt(sbi, INLINE_XATTR);
 345                         break;
 346 #else
 347                 case Opt_user_xattr:
 348                         f2fs_msg(sb, KERN_INFO,
 349                                 "user_xattr options not supported");
 350                         break;
 351                 case Opt_nouser_xattr:
 352                         f2fs_msg(sb, KERN_INFO,
 353                                 "nouser_xattr options not supported");
 354                         break;
 355                 case Opt_inline_xattr:
 356                         f2fs_msg(sb, KERN_INFO,
 357                                 "inline_xattr options not supported");
 358                         break;
 359 #endif
 360 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 361                 case Opt_acl:
 362                         set_opt(sbi, POSIX_ACL);
 363                         break;
 364                 case Opt_noacl:
 365                         clear_opt(sbi, POSIX_ACL);
 366                         break;
 367 #else
 368                 case Opt_acl:
 369                         f2fs_msg(sb, KERN_INFO, "acl options not supported");
 370                         break;
 371                 case Opt_noacl:
 372                         f2fs_msg(sb, KERN_INFO, "noacl options not supported");
 373                         break;
 374 #endif
 375                 case Opt_active_logs:
 376                         if (args->from && match_int(args, &arg))
 377                                 return -EINVAL;
 378                         if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
 379                                 return -EINVAL;
 380                         sbi->active_logs = arg;
 381                         break;
 382                 case Opt_disable_ext_identify:
 383                         set_opt(sbi, DISABLE_EXT_IDENTIFY);
 384                         break;
 385                 case Opt_inline_data:
 386                         set_opt(sbi, INLINE_DATA);
 387                         break;
 388                 case Opt_inline_dentry:
 389                         set_opt(sbi, INLINE_DENTRY);
 390                         break;
 391                 case Opt_flush_merge:
 392                         set_opt(sbi, FLUSH_MERGE);
 393                         break;
 394                 case Opt_nobarrier:
 395                         set_opt(sbi, NOBARRIER);
 396                         break;
 397                 case Opt_fastboot:
 398                         set_opt(sbi, FASTBOOT);
 399                         break;
 400                 case Opt_extent_cache:
 401                         set_opt(sbi, EXTENT_CACHE);
 402                         break;
 403                 case Opt_noextent_cache:
 404                         clear_opt(sbi, EXTENT_CACHE);
 405                         break;
 406                 case Opt_noinline_data:
 407                         clear_opt(sbi, INLINE_DATA);
 408                         break;
 409                 default:
 410                         f2fs_msg(sb, KERN_ERR,
 411                                 "Unrecognized mount option \"%s\" or missing value",
 412                                 p);
 413                         return -EINVAL;
 414                 }
 415         }
 416         return 0;
 417 }
 418
 419 static struct inode *f2fs_alloc_inode(struct super_block *sb)
 420 {
 421         struct f2fs_inode_info *fi;
 422
 423         fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
 424         if (!fi)
 425                 return NULL;
 426
 427         init_once((void *) fi);
 428
 429         /* Initialize f2fs-specific inode info */
 430         fi->vfs_inode.i_version = 1;
 431         atomic_set(&fi->dirty_pages, 0);
 432         fi->i_current_depth = 1;
 433         fi->i_advise = 0;
 434         init_rwsem(&fi->i_sem);
 435         INIT_LIST_HEAD(&fi->inmem_pages);
 436         mutex_init(&fi->inmem_lock);
 437
 438         set_inode_flag(fi, FI_NEW_INODE);
 439
 440         if (test_opt(F2FS_SB(sb), INLINE_XATTR))
 441                 set_inode_flag(fi, FI_INLINE_XATTR);
 442
 443         /* Will be used by directory only */
 444         fi->i_dir_level = F2FS_SB(sb)->dir_level;
 445
 446 #ifdef CONFIG_F2FS_FS_ENCRYPTION
 447         fi->i_crypt_info = NULL;
 448 #endif
 449         return &fi->vfs_inode;
 450 }
 451
 452 static int f2fs_drop_inode(struct inode *inode)
 453 {
 454         /*
 455          * This is to avoid a deadlock condition like below.
 456          * writeback_single_inode(inode)
 457          *  - f2fs_write_data_page
 458          *    - f2fs_gc -> iput -> evict
 459          *       - inode_wait_for_writeback(inode)
 460          */
 461         if (!inode_unhashed(inode) && inode->i_state & I_SYNC) {
 462                 if (!inode->i_nlink && !is_bad_inode(inode)) {
 463                         /* to avoid evict_inode call simultaneously */
 464                         atomic_inc(&inode->i_count);
 465                         spin_unlock(&inode->i_lock);
 466
 467                         /* some remained atomic pages should discarded */
 468                         if (f2fs_is_atomic_file(inode))
 469                                 commit_inmem_pages(inode, true);
 470
 471                         /* should remain fi->extent_tree for writepage */
 472                         f2fs_destroy_extent_node(inode);
 473
 474                         sb_start_intwrite(inode->i_sb);
 475                         i_size_write(inode, 0);
 476
 477                         if (F2FS_HAS_BLOCKS(inode))
 478                                 f2fs_truncate(inode, true);
 479
 480                         sb_end_intwrite(inode->i_sb);
 481
 482 #ifdef CONFIG_F2FS_FS_ENCRYPTION
 483                         if (F2FS_I(inode)->i_crypt_info)
 484                                 f2fs_free_encryption_info(inode,
 485                                         F2FS_I(inode)->i_crypt_info);
 486 #endif
 487                         spin_lock(&inode->i_lock);
 488                         atomic_dec(&inode->i_count);
 489                 }
 490                 return 0;
 491         }
 492         return generic_drop_inode(inode);
 493 }
 494
 495 /*
 496  * f2fs_dirty_inode() is called from __mark_inode_dirty()
 497  *
 498  * We should call set_dirty_inode to write the dirty inode through write_inode.
 499  */
 500 static void f2fs_dirty_inode(struct inode *inode, int flags)
 501 {
 502         set_inode_flag(F2FS_I(inode), FI_DIRTY_INODE);
 503 }
 504
 505 static void f2fs_i_callback(struct rcu_head *head)
 506 {
 507         struct inode *inode = container_of(head, struct inode, i_rcu);
 508         kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
 509 }
 510
 511 static void f2fs_destroy_inode(struct inode *inode)
 512 {
 513         call_rcu(&inode->i_rcu, f2fs_i_callback);
 514 }
 515
 516 static void f2fs_put_super(struct super_block *sb)
 517 {
 518         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 519
 520         if (sbi->s_proc) {
 521                 remove_proc_entry("segment_info", sbi->s_proc);
 522                 remove_proc_entry(sb->s_id, f2fs_proc_root);
 523         }
 524         kobject_del(&sbi->s_kobj);
 525
 526         stop_gc_thread(sbi);
 527
 528         /* prevent remaining shrinker jobs */
 529         mutex_lock(&sbi->umount_mutex);
 530
 531         /*
 532          * We don't need to do checkpoint when superblock is clean.
 533          * But, the previous checkpoint was not done by umount, it needs to do
 534          * clean checkpoint again.
 535          */
 536         if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
 537                         !is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) {
 538                 struct cp_control cpc = {
 539                         .reason = CP_UMOUNT,
 540                 };
 541                 write_checkpoint(sbi, &cpc);
 542         }
 543
 544         /* write_checkpoint can update stat informaion */
 545         f2fs_destroy_stats(sbi);
 546
 547         /*
 548          * normally superblock is clean, so we need to release this.
 549          * In addition, EIO will skip do checkpoint, we need this as well.
 550          */
 551         release_dirty_inode(sbi);
 552         release_discard_addrs(sbi);
 553
 554         f2fs_leave_shrinker(sbi);
 555         mutex_unlock(&sbi->umount_mutex);
 556
 557         iput(sbi->node_inode);
 558         iput(sbi->meta_inode);
 559
 560         /* destroy f2fs internal modules */
 561         destroy_node_manager(sbi);
 562         destroy_segment_manager(sbi);
 563
 564         kfree(sbi->ckpt);
 565         kobject_put(&sbi->s_kobj);
 566         wait_for_completion(&sbi->s_kobj_unregister);
 567
 568         sb->s_fs_info = NULL;
 569         brelse(sbi->raw_super_buf);
 570         kfree(sbi);
 571 }
 572
 573 int f2fs_sync_fs(struct super_block *sb, int sync)
 574 {
 575         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 576
 577         trace_f2fs_sync_fs(sb, sync);
 578
 579         if (sync) {
 580                 struct cp_control cpc;
 581
 582                 cpc.reason = __get_cp_reason(sbi);
 583
 584                 mutex_lock(&sbi->gc_mutex);
 585                 write_checkpoint(sbi, &cpc);
 586                 mutex_unlock(&sbi->gc_mutex);
 587         } else {
 588                 f2fs_balance_fs(sbi);
 589         }
 590         f2fs_trace_ios(NULL, 1);
 591
 592         return 0;
 593 }
 594
 595 static int f2fs_freeze(struct super_block *sb)
 596 {
 597         int err;
 598
 599         if (f2fs_readonly(sb))
 600                 return 0;
 601
 602         err = f2fs_sync_fs(sb, 1);
 603         return err;
 604 }
 605
 606 static int f2fs_unfreeze(struct super_block *sb)
 607 {
 608         return 0;
 609 }
 610
 611 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
 612 {
 613         struct super_block *sb = dentry->d_sb;
 614         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 615         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 616         block_t total_count, user_block_count, start_count, ovp_count;
 617
 618         total_count = le64_to_cpu(sbi->raw_super->block_count);
 619         user_block_count = sbi->user_block_count;
 620         start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
 621         ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
 622         buf->f_type = F2FS_SUPER_MAGIC;
 623         buf->f_bsize = sbi->blocksize;
 624
 625         buf->f_blocks = total_count - start_count;
 626         buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
 627         buf->f_bavail = user_block_count - valid_user_blocks(sbi);
 628
 629         buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
 630         buf->f_ffree = buf->f_files - valid_inode_count(sbi);
 631
 632         buf->f_namelen = F2FS_NAME_LEN;
 633         buf->f_fsid.val[0] = (u32)id;
 634         buf->f_fsid.val[1] = (u32)(id >> 32);
 635
 636         return 0;
 637 }
 638
 639 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
 640 {
 641         struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
 642
 643         if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC)) {
 644                 if (test_opt(sbi, FORCE_FG_GC))
 645                         seq_printf(seq, ",background_gc=%s", "sync");
 646                 else
 647                         seq_printf(seq, ",background_gc=%s", "on");
 648         } else {
 649                 seq_printf(seq, ",background_gc=%s", "off");
 650         }
 651         if (test_opt(sbi, DISABLE_ROLL_FORWARD))
 652                 seq_puts(seq, ",disable_roll_forward");
 653         if (test_opt(sbi, DISCARD))
 654                 seq_puts(seq, ",discard");
 655         if (test_opt(sbi, NOHEAP))
 656                 seq_puts(seq, ",no_heap_alloc");
 657 #ifdef CONFIG_F2FS_FS_XATTR
 658         if (test_opt(sbi, XATTR_USER))
 659                 seq_puts(seq, ",user_xattr");
 660         else
 661                 seq_puts(seq, ",nouser_xattr");
 662         if (test_opt(sbi, INLINE_XATTR))
 663                 seq_puts(seq, ",inline_xattr");
 664 #endif
 665 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 666         if (test_opt(sbi, POSIX_ACL))
 667                 seq_puts(seq, ",acl");
 668         else
 669                 seq_puts(seq, ",noacl");
 670 #endif
 671         if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
 672                 seq_puts(seq, ",disable_ext_identify");
 673         if (test_opt(sbi, INLINE_DATA))
 674                 seq_puts(seq, ",inline_data");
 675         else
 676                 seq_puts(seq, ",noinline_data");
 677         if (test_opt(sbi, INLINE_DENTRY))
 678                 seq_puts(seq, ",inline_dentry");
 679         if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
 680                 seq_puts(seq, ",flush_merge");
 681         if (test_opt(sbi, NOBARRIER))
 682                 seq_puts(seq, ",nobarrier");
 683         if (test_opt(sbi, FASTBOOT))
 684                 seq_puts(seq, ",fastboot");
 685         if (test_opt(sbi, EXTENT_CACHE))
 686                 seq_puts(seq, ",extent_cache");
 687         else
 688                 seq_puts(seq, ",noextent_cache");
 689         seq_printf(seq, ",active_logs=%u", sbi->active_logs);
 690
 691         return 0;
 692 }
 693
 694 static int segment_info_seq_show(struct seq_file *seq, void *offset)
 695 {
 696         struct super_block *sb = seq->private;
 697         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 698         unsigned int total_segs =
 699                         le32_to_cpu(sbi->raw_super->segment_count_main);
 700         int i;
 701
 702         seq_puts(seq, "format: segment_type|valid_blocks\n"
 703                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
 704
 705         for (i = 0; i < total_segs; i++) {
 706                 struct seg_entry *se = get_seg_entry(sbi, i);
 707
 708                 if ((i % 10) == 0)
 709                         seq_printf(seq, "%-10d", i);
 710                 seq_printf(seq, "%d|%-3u", se->type,
 711                                         get_valid_blocks(sbi, i, 1));
 712                 if ((i % 10) == 9 || i == (total_segs - 1))
 713                         seq_putc(seq, '\n');
 714                 else
 715                         seq_putc(seq, ' ');
 716         }
 717
 718         return 0;
 719 }
 720
 721 static int segment_info_open_fs(struct inode *inode, struct file *file)
 722 {
 723         return single_open(file, segment_info_seq_show, PDE_DATA(inode));
 724 }
 725
 726 static const struct file_operations f2fs_seq_segment_info_fops = {
 727         .owner = THIS_MODULE,
 728         .open = segment_info_open_fs,
 729         .read = seq_read,
 730         .llseek = seq_lseek,
 731         .release = single_release,
 732 };
 733
 734 static void default_options(struct f2fs_sb_info *sbi)
 735 {
 736         /* init some FS parameters */
 737         sbi->active_logs = NR_CURSEG_TYPE;
 738
 739         set_opt(sbi, BG_GC);
 740         set_opt(sbi, INLINE_DATA);
 741         set_opt(sbi, EXTENT_CACHE);
 742
 743 #ifdef CONFIG_F2FS_FS_XATTR
 744         set_opt(sbi, XATTR_USER);
 745 #endif
 746 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 747         set_opt(sbi, POSIX_ACL);
 748 #endif
 749 }
 750
 751 static int f2fs_remount(struct super_block *sb, int *flags, char *data)
 752 {
 753         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 754         struct f2fs_mount_info org_mount_opt;
 755         int err, active_logs;
 756         bool need_restart_gc = false;
 757         bool need_stop_gc = false;
 758         bool no_extent_cache = !test_opt(sbi, EXTENT_CACHE);
 759
 760         sync_filesystem(sb);
 761
 762         /*
 763          * Save the old mount options in case we
 764          * need to restore them.
 765          */
 766         org_mount_opt = sbi->mount_opt;
 767         active_logs = sbi->active_logs;
 768
 769         sbi->mount_opt.opt = 0;
 770         default_options(sbi);
 771
 772         /* parse mount options */
 773         err = parse_options(sb, data);
 774         if (err)
 775                 goto restore_opts;
 776
 777         /*
 778          * Previous and new state of filesystem is RO,
 779          * so skip checking GC and FLUSH_MERGE conditions.
 780          */
 781         if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
 782                 goto skip;
 783
 784         /* disallow enable/disable extent_cache dynamically */
 785         if (no_extent_cache == !!test_opt(sbi, EXTENT_CACHE)) {
 786                 err = -EINVAL;
 787                 f2fs_msg(sbi->sb, KERN_WARNING,
 788                                 "switch extent_cache option is not allowed");
 789                 goto restore_opts;
 790         }
 791
 792         /*
 793          * We stop the GC thread if FS is mounted as RO
 794          * or if background_gc = off is passed in mount
 795          * option. Also sync the filesystem.
 796          */
 797         if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
 798                 if (sbi->gc_thread) {
 799                         stop_gc_thread(sbi);
 800                         f2fs_sync_fs(sb, 1);
 801                         need_restart_gc = true;
 802                 }
 803         } else if (!sbi->gc_thread) {
 804                 err = start_gc_thread(sbi);
 805                 if (err)
 806                         goto restore_opts;
 807                 need_stop_gc = true;
 808         }
 809
 810         /*
 811          * We stop issue flush thread if FS is mounted as RO
 812          * or if flush_merge is not passed in mount option.
 813          */
 814         if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
 815                 destroy_flush_cmd_control(sbi);
 816         } else if (!SM_I(sbi)->cmd_control_info) {
 817                 err = create_flush_cmd_control(sbi);
 818                 if (err)
 819                         goto restore_gc;
 820         }
 821 skip:
 822         /* Update the POSIXACL Flag */
 823          sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 824                 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
 825         return 0;
 826 restore_gc:
 827         if (need_restart_gc) {
 828                 if (start_gc_thread(sbi))
 829                         f2fs_msg(sbi->sb, KERN_WARNING,
 830                                 "background gc thread has stopped");
 831         } else if (need_stop_gc) {
 832                 stop_gc_thread(sbi);
 833         }
 834 restore_opts:
 835         sbi->mount_opt = org_mount_opt;
 836         sbi->active_logs = active_logs;
 837         return err;
 838 }
 839
 840 static struct super_operations f2fs_sops = {
 841         .alloc_inode    = f2fs_alloc_inode,
 842         .drop_inode     = f2fs_drop_inode,
 843         .destroy_inode  = f2fs_destroy_inode,
 844         .write_inode    = f2fs_write_inode,
 845         .dirty_inode    = f2fs_dirty_inode,
 846         .show_options   = f2fs_show_options,
 847         .evict_inode    = f2fs_evict_inode,
 848         .put_super      = f2fs_put_super,
 849         .sync_fs        = f2fs_sync_fs,
 850         .freeze_fs      = f2fs_freeze,
 851         .unfreeze_fs    = f2fs_unfreeze,
 852         .statfs         = f2fs_statfs,
 853         .remount_fs     = f2fs_remount,
 854 };
 855
 856 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
 857                 u64 ino, u32 generation)
 858 {
 859         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 860         struct inode *inode;
 861
 862         if (check_nid_range(sbi, ino))
 863                 return ERR_PTR(-ESTALE);
 864
 865         /*
 866          * f2fs_iget isn't quite right if the inode is currently unallocated!
 867          * However f2fs_iget currently does appropriate checks to handle stale
 868          * inodes so everything is OK.
 869          */
 870         inode = f2fs_iget(sb, ino);
 871         if (IS_ERR(inode))
 872                 return ERR_CAST(inode);
 873         if (unlikely(generation && inode->i_generation != generation)) {
 874                 /* we didn't find the right inode.. */
 875                 iput(inode);
 876                 return ERR_PTR(-ESTALE);
 877         }
 878         return inode;
 879 }
 880
 881 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
 882                 int fh_len, int fh_type)
 883 {
 884         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
 885                                     f2fs_nfs_get_inode);
 886 }
 887
 888 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
 889                 int fh_len, int fh_type)
 890 {
 891         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
 892                                     f2fs_nfs_get_inode);
 893 }
 894
 895 static const struct export_operations f2fs_export_ops = {
 896         .fh_to_dentry = f2fs_fh_to_dentry,
 897         .fh_to_parent = f2fs_fh_to_parent,
 898         .get_parent = f2fs_get_parent,
 899 };
 900
 901 static loff_t max_file_size(unsigned bits)
 902 {
 903         loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
 904         loff_t leaf_count = ADDRS_PER_BLOCK;
 905
 906         /* two direct node blocks */
 907         result += (leaf_count * 2);
 908
 909         /* two indirect node blocks */
 910         leaf_count *= NIDS_PER_BLOCK;
 911         result += (leaf_count * 2);
 912
 913         /* one double indirect node block */
 914         leaf_count *= NIDS_PER_BLOCK;
 915         result += leaf_count;
 916
 917         result <<= bits;
 918         return result;
 919 }
 920
 921 static int sanity_check_raw_super(struct super_block *sb,
 922                         struct f2fs_super_block *raw_super)
 923 {
 924         unsigned int blocksize;
 925
 926         if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
 927                 f2fs_msg(sb, KERN_INFO,
 928                         "Magic Mismatch, valid(0x%x) - read(0x%x)",
 929                         F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
 930                 return 1;
 931         }
 932
 933         /* Currently, support only 4KB page cache size */
 934         if (F2FS_BLKSIZE != PAGE_CACHE_SIZE) {
 935                 f2fs_msg(sb, KERN_INFO,
 936                         "Invalid page_cache_size (%lu), supports only 4KB\n",
 937                         PAGE_CACHE_SIZE);
 938                 return 1;
 939         }
 940
 941         /* Currently, support only 4KB block size */
 942         blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
 943         if (blocksize != F2FS_BLKSIZE) {
 944                 f2fs_msg(sb, KERN_INFO,
 945                         "Invalid blocksize (%u), supports only 4KB\n",
 946                         blocksize);
 947                 return 1;
 948         }
 949
 950         /* Currently, support 512/1024/2048/4096 bytes sector size */
 951         if (le32_to_cpu(raw_super->log_sectorsize) >
 952                                 F2FS_MAX_LOG_SECTOR_SIZE ||
 953                 le32_to_cpu(raw_super->log_sectorsize) <
 954                                 F2FS_MIN_LOG_SECTOR_SIZE) {
 955                 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)",
 956                         le32_to_cpu(raw_super->log_sectorsize));
 957                 return 1;
 958         }
 959         if (le32_to_cpu(raw_super->log_sectors_per_block) +
 960                 le32_to_cpu(raw_super->log_sectorsize) !=
 961                         F2FS_MAX_LOG_SECTOR_SIZE) {
 962                 f2fs_msg(sb, KERN_INFO,
 963                         "Invalid log sectors per block(%u) log sectorsize(%u)",
 964                         le32_to_cpu(raw_super->log_sectors_per_block),
 965                         le32_to_cpu(raw_super->log_sectorsize));
 966                 return 1;
 967         }
 968         return 0;
 969 }
 970
 971 static int sanity_check_ckpt(struct f2fs_sb_info *sbi)
 972 {
 973         unsigned int total, fsmeta;
 974         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
 975         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
 976
 977         total = le32_to_cpu(raw_super->segment_count);
 978         fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
 979         fsmeta += le32_to_cpu(raw_super->segment_count_sit);
 980         fsmeta += le32_to_cpu(raw_super->segment_count_nat);
 981         fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
 982         fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
 983
 984         if (unlikely(fsmeta >= total))
 985                 return 1;
 986
 987         if (unlikely(f2fs_cp_error(sbi))) {
 988                 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
 989                 return 1;
 990         }
 991         return 0;
 992 }
 993
 994 static void init_sb_info(struct f2fs_sb_info *sbi)
 995 {
 996         struct f2fs_super_block *raw_super = sbi->raw_super;
 997         int i;
 998
 999         sbi->log_sectors_per_block =
1000                 le32_to_cpu(raw_super->log_sectors_per_block);
1001         sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
1002         sbi->blocksize = 1 << sbi->log_blocksize;
1003         sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
1004         sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
1005         sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
1006         sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
1007         sbi->total_sections = le32_to_cpu(raw_super->section_count);
1008         sbi->total_node_count =
1009                 (le32_to_cpu(raw_super->segment_count_nat) / 2)
1010                         * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
1011         sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
1012         sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
1013         sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
1014         sbi->cur_victim_sec = NULL_SECNO;
1015         sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
1016
1017         for (i = 0; i < NR_COUNT_TYPE; i++)
1018                 atomic_set(&sbi->nr_pages[i], 0);
1019
1020         sbi->dir_level = DEF_DIR_LEVEL;
1021         sbi->cp_interval = DEF_CP_INTERVAL;
1022         clear_sbi_flag(sbi, SBI_NEED_FSCK);
1023
1024         INIT_LIST_HEAD(&sbi->s_list);
1025         mutex_init(&sbi->umount_mutex);
1026 }
1027
1028 /*
1029  * Read f2fs raw super block.
1030  * Because we have two copies of super block, so read the first one at first,
1031  * if the first one is invalid, move to read the second one.
1032  */
1033 static int read_raw_super_block(struct super_block *sb,
1034                         struct f2fs_super_block **raw_super,
1035                         struct buffer_head **raw_super_buf,
1036                         int *recovery)
1037 {
1038         int block = 0;
1039         struct buffer_head *buffer;
1040         struct f2fs_super_block *super;
1041         int err = 0;
1042
1043 retry:
1044         buffer = sb_bread(sb, block);
1045         if (!buffer) {
1046                 *recovery = 1;
1047                 f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
1048                                 block + 1);
1049                 if (block == 0) {
1050                         block++;
1051                         goto retry;
1052                 } else {
1053                         err = -EIO;
1054                         goto out;
1055                 }
1056         }
1057
1058         super = (struct f2fs_super_block *)
1059                 ((char *)(buffer)->b_data + F2FS_SUPER_OFFSET);
1060
1061         /* sanity checking of raw super */
1062         if (sanity_check_raw_super(sb, super)) {
1063                 brelse(buffer);
1064                 *recovery = 1;
1065                 f2fs_msg(sb, KERN_ERR,
1066                         "Can't find valid F2FS filesystem in %dth superblock",
1067                                                                 block + 1);
1068                 if (block == 0) {
1069                         block++;
1070                         goto retry;
1071                 } else {
1072                         err = -EINVAL;
1073                         goto out;
1074                 }
1075         }
1076
1077         if (!*raw_super) {
1078                 *raw_super_buf = buffer;
1079                 *raw_super = super;
1080         } else {
1081                 /* already have a valid superblock */
1082                 brelse(buffer);
1083         }
1084
1085         /* check the validity of the second superblock */
1086         if (block == 0) {
1087                 block++;
1088                 goto retry;
1089         }
1090
1091 out:
1092         /* No valid superblock */
1093         if (!*raw_super)
1094                 return err;
1095
1096         return 0;
1097 }
1098
1099 int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover)
1100 {
1101         struct buffer_head *sbh = sbi->raw_super_buf;
1102         sector_t block = sbh->b_blocknr;
1103         int err;
1104
1105         /* write back-up superblock first */
1106         sbh->b_blocknr = block ? 0 : 1;
1107         mark_buffer_dirty(sbh);
1108         err = sync_dirty_buffer(sbh);
1109
1110         sbh->b_blocknr = block;
1111
1112         /* if we are in recovery path, skip writing valid superblock */
1113         if (recover || err)
1114                 goto out;
1115
1116         /* write current valid superblock */
1117         mark_buffer_dirty(sbh);
1118         err = sync_dirty_buffer(sbh);
1119 out:
1120         clear_buffer_write_io_error(sbh);
1121         set_buffer_uptodate(sbh);
1122         return err;
1123 }
1124
1125 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
1126 {
1127         struct f2fs_sb_info *sbi;
1128         struct f2fs_super_block *raw_super;
1129         struct buffer_head *raw_super_buf;
1130         struct inode *root;
1131         long err;
1132         bool retry = true, need_fsck = false;
1133         char *options = NULL;
1134         int recovery, i;
1135
1136 try_onemore:
1137         err = -EINVAL;
1138         raw_super = NULL;
1139         raw_super_buf = NULL;
1140         recovery = 0;
1141
1142         /* allocate memory for f2fs-specific super block info */
1143         sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
1144         if (!sbi)
1145                 return -ENOMEM;
1146
1147         /* set a block size */
1148         if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
1149                 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
1150                 goto free_sbi;
1151         }
1152
1153         err = read_raw_super_block(sb, &raw_super, &raw_super_buf, &recovery);
1154         if (err)
1155                 goto free_sbi;
1156
1157         sb->s_fs_info = sbi;
1158         default_options(sbi);
1159         /* parse mount options */
1160         options = kstrdup((const char *)data, GFP_KERNEL);
1161         if (data && !options) {
1162                 err = -ENOMEM;
1163                 goto free_sb_buf;
1164         }
1165
1166         err = parse_options(sb, options);
1167         if (err)
1168                 goto free_options;
1169
1170         sb->s_maxbytes = max_file_size(le32_to_cpu(raw_super->log_blocksize));
1171         sb->s_max_links = F2FS_LINK_MAX;
1172         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1173
1174         sb->s_op = &f2fs_sops;
1175         sb->s_xattr = f2fs_xattr_handlers;
1176         sb->s_export_op = &f2fs_export_ops;
1177         sb->s_magic = F2FS_SUPER_MAGIC;
1178         sb->s_time_gran = 1;
1179         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1180                 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
1181         memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
1182
1183         /* init f2fs-specific super block info */
1184         sbi->sb = sb;
1185         sbi->raw_super = raw_super;
1186         sbi->raw_super_buf = raw_super_buf;
1187         mutex_init(&sbi->gc_mutex);
1188         mutex_init(&sbi->writepages);
1189         mutex_init(&sbi->cp_mutex);
1190         init_rwsem(&sbi->node_write);
1191
1192         /* disallow all the data/node/meta page writes */
1193         set_sbi_flag(sbi, SBI_POR_DOING);
1194         spin_lock_init(&sbi->stat_lock);
1195
1196         init_rwsem(&sbi->read_io.io_rwsem);
1197         sbi->read_io.sbi = sbi;
1198         sbi->read_io.bio = NULL;
1199         for (i = 0; i < NR_PAGE_TYPE; i++) {
1200                 init_rwsem(&sbi->write_io[i].io_rwsem);
1201                 sbi->write_io[i].sbi = sbi;
1202                 sbi->write_io[i].bio = NULL;
1203         }
1204
1205         init_rwsem(&sbi->cp_rwsem);
1206         init_waitqueue_head(&sbi->cp_wait);
1207         init_sb_info(sbi);
1208
1209         /* get an inode for meta space */
1210         sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
1211         if (IS_ERR(sbi->meta_inode)) {
1212                 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
1213                 err = PTR_ERR(sbi->meta_inode);
1214                 goto free_options;
1215         }
1216
1217         err = get_valid_checkpoint(sbi);
1218         if (err) {
1219                 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
1220                 goto free_meta_inode;
1221         }
1222
1223         /* sanity checking of checkpoint */
1224         err = -EINVAL;
1225         if (sanity_check_ckpt(sbi)) {
1226                 f2fs_msg(sb, KERN_ERR, "Invalid F2FS checkpoint");
1227                 goto free_cp;
1228         }
1229
1230         sbi->total_valid_node_count =
1231                                 le32_to_cpu(sbi->ckpt->valid_node_count);
1232         sbi->total_valid_inode_count =
1233                                 le32_to_cpu(sbi->ckpt->valid_inode_count);
1234         sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
1235         sbi->total_valid_block_count =
1236                                 le64_to_cpu(sbi->ckpt->valid_block_count);
1237         sbi->last_valid_block_count = sbi->total_valid_block_count;
1238         sbi->alloc_valid_block_count = 0;
1239         INIT_LIST_HEAD(&sbi->dir_inode_list);
1240         spin_lock_init(&sbi->dir_inode_lock);
1241
1242         init_extent_cache_info(sbi);
1243
1244         init_ino_entry_info(sbi);
1245
1246         /* setup f2fs internal modules */
1247         err = build_segment_manager(sbi);
1248         if (err) {
1249                 f2fs_msg(sb, KERN_ERR,
1250                         "Failed to initialize F2FS segment manager");
1251                 goto free_sm;
1252         }
1253         err = build_node_manager(sbi);
1254         if (err) {
1255                 f2fs_msg(sb, KERN_ERR,
1256                         "Failed to initialize F2FS node manager");
1257                 goto free_nm;
1258         }
1259
1260         build_gc_manager(sbi);
1261
1262         /* get an inode for node space */
1263         sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
1264         if (IS_ERR(sbi->node_inode)) {
1265                 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
1266                 err = PTR_ERR(sbi->node_inode);
1267                 goto free_nm;
1268         }
1269
1270         f2fs_join_shrinker(sbi);
1271
1272         /* if there are nt orphan nodes free them */
1273         err = recover_orphan_inodes(sbi);
1274         if (err)
1275                 goto free_node_inode;
1276
1277         /* read root inode and dentry */
1278         root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
1279         if (IS_ERR(root)) {
1280                 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
1281                 err = PTR_ERR(root);
1282                 goto free_node_inode;
1283         }
1284         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1285                 iput(root);
1286                 err = -EINVAL;
1287                 goto free_node_inode;
1288         }
1289
1290         sb->s_root = d_make_root(root); /* allocate root dentry */
1291         if (!sb->s_root) {
1292                 err = -ENOMEM;
1293                 goto free_root_inode;
1294         }
1295
1296         err = f2fs_build_stats(sbi);
1297         if (err)
1298                 goto free_root_inode;
1299
1300         if (f2fs_proc_root)
1301                 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
1302
1303         if (sbi->s_proc)
1304                 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
1305                                  &f2fs_seq_segment_info_fops, sb);
1306
1307         sbi->s_kobj.kset = f2fs_kset;
1308         init_completion(&sbi->s_kobj_unregister);
1309         err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1310                                                         "%s", sb->s_id);
1311         if (err)
1312                 goto free_proc;
1313
1314         /* recover fsynced data */
1315         if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1316                 /*
1317                  * mount should be failed, when device has readonly mode, and
1318                  * previous checkpoint was not done by clean system shutdown.
1319                  */
1320                 if (bdev_read_only(sb->s_bdev) &&
1321                                 !is_set_ckpt_flags(sbi->ckpt, CP_UMOUNT_FLAG)) {
1322                         err = -EROFS;
1323                         goto free_kobj;
1324                 }
1325
1326                 if (need_fsck)
1327                         set_sbi_flag(sbi, SBI_NEED_FSCK);
1328
1329                 err = recover_fsync_data(sbi);
1330                 if (err) {
1331                         need_fsck = true;
1332                         f2fs_msg(sb, KERN_ERR,
1333                                 "Cannot recover all fsync data errno=%ld", err);
1334                         goto free_kobj;
1335                 }
1336         }
1337         /* recover_fsync_data() cleared this already */
1338         clear_sbi_flag(sbi, SBI_POR_DOING);
1339
1340         /*
1341          * If filesystem is not mounted as read-only then
1342          * do start the gc_thread.
1343          */
1344         if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) {
1345                 /* After POR, we can run background GC thread.*/
1346                 err = start_gc_thread(sbi);
1347                 if (err)
1348                         goto free_kobj;
1349         }
1350         kfree(options);
1351
1352         /* recover broken superblock */
1353         if (recovery && !f2fs_readonly(sb) && !bdev_read_only(sb->s_bdev)) {
1354                 f2fs_msg(sb, KERN_INFO, "Recover invalid superblock");
1355                 f2fs_commit_super(sbi, true);
1356         }
1357
1358         sbi->cp_expires = round_jiffies_up(jiffies);
1359
1360         return 0;
1361
1362 free_kobj:
1363         kobject_del(&sbi->s_kobj);
1364 free_proc:
1365         if (sbi->s_proc) {
1366                 remove_proc_entry("segment_info", sbi->s_proc);
1367                 remove_proc_entry(sb->s_id, f2fs_proc_root);
1368         }
1369         f2fs_destroy_stats(sbi);
1370 free_root_inode:
1371         dput(sb->s_root);
1372         sb->s_root = NULL;
1373 free_node_inode:
1374         mutex_lock(&sbi->umount_mutex);
1375         f2fs_leave_shrinker(sbi);
1376         iput(sbi->node_inode);
1377         mutex_unlock(&sbi->umount_mutex);
1378 free_nm:
1379         destroy_node_manager(sbi);
1380 free_sm:
1381         destroy_segment_manager(sbi);
1382 free_cp:
1383         kfree(sbi->ckpt);
1384 free_meta_inode:
1385         make_bad_inode(sbi->meta_inode);
1386         iput(sbi->meta_inode);
1387 free_options:
1388         kfree(options);
1389 free_sb_buf:
1390         brelse(raw_super_buf);
1391 free_sbi:
1392         kfree(sbi);
1393
1394         /* give only one another chance */
1395         if (retry) {
1396                 retry = false;
1397                 shrink_dcache_sb(sb);
1398                 goto try_onemore;
1399         }
1400         return err;
1401 }
1402
1403 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
1404                         const char *dev_name, void *data)
1405 {
1406         return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
1407 }
1408
1409 static void kill_f2fs_super(struct super_block *sb)
1410 {
1411         if (sb->s_root)
1412                 set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE);
1413         kill_block_super(sb);
1414 }
1415
1416 static struct file_system_type f2fs_fs_type = {
1417         .owner          = THIS_MODULE,
1418         .name           = "f2fs",
1419         .mount          = f2fs_mount,
1420         .kill_sb        = kill_f2fs_super,
1421         .fs_flags       = FS_REQUIRES_DEV,
1422 };
1423 MODULE_ALIAS_FS("f2fs");
1424
1425 static int __init init_inodecache(void)
1426 {
1427         f2fs_inode_cachep = f2fs_kmem_cache_create("f2fs_inode_cache",
1428                         sizeof(struct f2fs_inode_info));
1429         if (!f2fs_inode_cachep)
1430                 return -ENOMEM;
1431         return 0;
1432 }
1433
1434 static void destroy_inodecache(void)
1435 {
1436         /*
1437          * Make sure all delayed rcu free inodes are flushed before we
1438          * destroy cache.
1439          */
1440         rcu_barrier();
1441         kmem_cache_destroy(f2fs_inode_cachep);
1442 }
1443
1444 static int __init init_f2fs_fs(void)
1445 {
1446         int err;
1447
1448         f2fs_build_trace_ios();
1449
1450         err = init_inodecache();
1451         if (err)
1452                 goto fail;
1453         err = create_node_manager_caches();
1454         if (err)
1455                 goto free_inodecache;
1456         err = create_segment_manager_caches();
1457         if (err)
1458                 goto free_node_manager_caches;
1459         err = create_checkpoint_caches();
1460         if (err)
1461                 goto free_segment_manager_caches;
1462         err = create_extent_cache();
1463         if (err)
1464                 goto free_checkpoint_caches;
1465         f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
1466         if (!f2fs_kset) {
1467                 err = -ENOMEM;
1468                 goto free_extent_cache;
1469         }
1470         err = f2fs_init_crypto();
1471         if (err)
1472                 goto free_kset;
1473
1474         err = register_shrinker(&f2fs_shrinker_info);
1475         if (err)
1476                 goto free_crypto;
1477
1478         err = register_filesystem(&f2fs_fs_type);
1479         if (err)
1480                 goto free_shrinker;
1481         f2fs_create_root_stats();
1482         f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1483         return 0;
1484
1485 free_shrinker:
1486         unregister_shrinker(&f2fs_shrinker_info);
1487 free_crypto:
1488         f2fs_exit_crypto();
1489 free_kset:
1490         kset_unregister(f2fs_kset);
1491 free_extent_cache:
1492         destroy_extent_cache();
1493 free_checkpoint_caches:
1494         destroy_checkpoint_caches();
1495 free_segment_manager_caches:
1496         destroy_segment_manager_caches();
1497 free_node_manager_caches:
1498         destroy_node_manager_caches();
1499 free_inodecache:
1500         destroy_inodecache();
1501 fail:
1502         return err;
1503 }
1504
1505 static void __exit exit_f2fs_fs(void)
1506 {
1507         remove_proc_entry("fs/f2fs", NULL);
1508         f2fs_destroy_root_stats();
1509         unregister_shrinker(&f2fs_shrinker_info);
1510         unregister_filesystem(&f2fs_fs_type);
1511         f2fs_exit_crypto();
1512         destroy_extent_cache();
1513         destroy_checkpoint_caches();
1514         destroy_segment_manager_caches();
1515         destroy_node_manager_caches();
1516         destroy_inodecache();
1517         kset_unregister(f2fs_kset);
1518         f2fs_destroy_trace_ios();
1519 }
1520
1521 module_init(init_f2fs_fs)
1522 module_exit(exit_f2fs_fs)
1523
1524 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
1525 MODULE_DESCRIPTION("Flash Friendly File System");
1526 MODULE_LICENSE("GPL");