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 #ifdef CONFIG_F2FS_FAULT_INJECTION
  43 struct f2fs_fault_info f2fs_fault;
  44
  45 char *fault_name[FAULT_MAX] = {
  46         [FAULT_KMALLOC]         = "kmalloc",
  47         [FAULT_PAGE_ALLOC]      = "page alloc",
  48         [FAULT_ALLOC_NID]       = "alloc nid",
  49         [FAULT_ORPHAN]          = "orphan",
  50         [FAULT_BLOCK]           = "no more block",
  51         [FAULT_DIR_DEPTH]       = "too big dir depth",
  52         [FAULT_EVICT_INODE]     = "evict_inode fail",
  53 };
  54
  55 static void f2fs_build_fault_attr(unsigned int rate)
  56 {
  57         if (rate) {
  58                 atomic_set(&f2fs_fault.inject_ops, 0);
  59                 f2fs_fault.inject_rate = rate;
  60                 f2fs_fault.inject_type = (1 << FAULT_MAX) - 1;
  61         } else {
  62                 memset(&f2fs_fault, 0, sizeof(struct f2fs_fault_info));
  63         }
  64 }
  65 #endif
  66
  67 /* f2fs-wide shrinker description */
  68 static struct shrinker f2fs_shrinker_info = {
  69         .scan_objects = f2fs_shrink_scan,
  70         .count_objects = f2fs_shrink_count,
  71         .seeks = DEFAULT_SEEKS,
  72 };
  73
  74 enum {
  75         Opt_gc_background,
  76         Opt_disable_roll_forward,
  77         Opt_norecovery,
  78         Opt_discard,
  79         Opt_noheap,
  80         Opt_user_xattr,
  81         Opt_nouser_xattr,
  82         Opt_acl,
  83         Opt_noacl,
  84         Opt_active_logs,
  85         Opt_disable_ext_identify,
  86         Opt_inline_xattr,
  87         Opt_inline_data,
  88         Opt_inline_dentry,
  89         Opt_flush_merge,
  90         Opt_noflush_merge,
  91         Opt_nobarrier,
  92         Opt_fastboot,
  93         Opt_extent_cache,
  94         Opt_noextent_cache,
  95         Opt_noinline_data,
  96         Opt_data_flush,
  97         Opt_fault_injection,
  98         Opt_lazytime,
  99         Opt_nolazytime,
 100         Opt_err,
 101 };
 102
 103 static match_table_t f2fs_tokens = {
 104         {Opt_gc_background, "background_gc=%s"},
 105         {Opt_disable_roll_forward, "disable_roll_forward"},
 106         {Opt_norecovery, "norecovery"},
 107         {Opt_discard, "discard"},
 108         {Opt_noheap, "no_heap"},
 109         {Opt_user_xattr, "user_xattr"},
 110         {Opt_nouser_xattr, "nouser_xattr"},
 111         {Opt_acl, "acl"},
 112         {Opt_noacl, "noacl"},
 113         {Opt_active_logs, "active_logs=%u"},
 114         {Opt_disable_ext_identify, "disable_ext_identify"},
 115         {Opt_inline_xattr, "inline_xattr"},
 116         {Opt_inline_data, "inline_data"},
 117         {Opt_inline_dentry, "inline_dentry"},
 118         {Opt_flush_merge, "flush_merge"},
 119         {Opt_noflush_merge, "noflush_merge"},
 120         {Opt_nobarrier, "nobarrier"},
 121         {Opt_fastboot, "fastboot"},
 122         {Opt_extent_cache, "extent_cache"},
 123         {Opt_noextent_cache, "noextent_cache"},
 124         {Opt_noinline_data, "noinline_data"},
 125         {Opt_data_flush, "data_flush"},
 126         {Opt_fault_injection, "fault_injection=%u"},
 127         {Opt_lazytime, "lazytime"},
 128         {Opt_nolazytime, "nolazytime"},
 129         {Opt_err, NULL},
 130 };
 131
 132 /* Sysfs support for f2fs */
 133 enum {
 134         GC_THREAD,      /* struct f2fs_gc_thread */
 135         SM_INFO,        /* struct f2fs_sm_info */
 136         NM_INFO,        /* struct f2fs_nm_info */
 137         F2FS_SBI,       /* struct f2fs_sb_info */
 138 #ifdef CONFIG_F2FS_FAULT_INJECTION
 139         FAULT_INFO_RATE,        /* struct f2fs_fault_info */
 140         FAULT_INFO_TYPE,        /* struct f2fs_fault_info */
 141 #endif
 142 };
 143
 144 struct f2fs_attr {
 145         struct attribute attr;
 146         ssize_t (*show)(struct f2fs_attr *, struct f2fs_sb_info *, char *);
 147         ssize_t (*store)(struct f2fs_attr *, struct f2fs_sb_info *,
 148                          const char *, size_t);
 149         int struct_type;
 150         int offset;
 151 };
 152
 153 static unsigned char *__struct_ptr(struct f2fs_sb_info *sbi, int struct_type)
 154 {
 155         if (struct_type == GC_THREAD)
 156                 return (unsigned char *)sbi->gc_thread;
 157         else if (struct_type == SM_INFO)
 158                 return (unsigned char *)SM_I(sbi);
 159         else if (struct_type == NM_INFO)
 160                 return (unsigned char *)NM_I(sbi);
 161         else if (struct_type == F2FS_SBI)
 162                 return (unsigned char *)sbi;
 163 #ifdef CONFIG_F2FS_FAULT_INJECTION
 164         else if (struct_type == FAULT_INFO_RATE ||
 165                                         struct_type == FAULT_INFO_TYPE)
 166                 return (unsigned char *)&f2fs_fault;
 167 #endif
 168         return NULL;
 169 }
 170
 171 static ssize_t lifetime_write_kbytes_show(struct f2fs_attr *a,
 172                 struct f2fs_sb_info *sbi, char *buf)
 173 {
 174         struct super_block *sb = sbi->sb;
 175
 176         if (!sb->s_bdev->bd_part)
 177                 return snprintf(buf, PAGE_SIZE, "0\n");
 178
 179         return snprintf(buf, PAGE_SIZE, "%llu\n",
 180                 (unsigned long long)(sbi->kbytes_written +
 181                         BD_PART_WRITTEN(sbi)));
 182 }
 183
 184 static ssize_t f2fs_sbi_show(struct f2fs_attr *a,
 185                         struct f2fs_sb_info *sbi, char *buf)
 186 {
 187         unsigned char *ptr = NULL;
 188         unsigned int *ui;
 189
 190         ptr = __struct_ptr(sbi, a->struct_type);
 191         if (!ptr)
 192                 return -EINVAL;
 193
 194         ui = (unsigned int *)(ptr + a->offset);
 195
 196         return snprintf(buf, PAGE_SIZE, "%u\n", *ui);
 197 }
 198
 199 static ssize_t f2fs_sbi_store(struct f2fs_attr *a,
 200                         struct f2fs_sb_info *sbi,
 201                         const char *buf, size_t count)
 202 {
 203         unsigned char *ptr;
 204         unsigned long t;
 205         unsigned int *ui;
 206         ssize_t ret;
 207
 208         ptr = __struct_ptr(sbi, a->struct_type);
 209         if (!ptr)
 210                 return -EINVAL;
 211
 212         ui = (unsigned int *)(ptr + a->offset);
 213
 214         ret = kstrtoul(skip_spaces(buf), 0, &t);
 215         if (ret < 0)
 216                 return ret;
 217 #ifdef CONFIG_F2FS_FAULT_INJECTION
 218         if (a->struct_type == FAULT_INFO_TYPE && t >= (1 << FAULT_MAX))
 219                 return -EINVAL;
 220 #endif
 221         *ui = t;
 222         return count;
 223 }
 224
 225 static ssize_t f2fs_attr_show(struct kobject *kobj,
 226                                 struct attribute *attr, char *buf)
 227 {
 228         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 229                                                                 s_kobj);
 230         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 231
 232         return a->show ? a->show(a, sbi, buf) : 0;
 233 }
 234
 235 static ssize_t f2fs_attr_store(struct kobject *kobj, struct attribute *attr,
 236                                                 const char *buf, size_t len)
 237 {
 238         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 239                                                                         s_kobj);
 240         struct f2fs_attr *a = container_of(attr, struct f2fs_attr, attr);
 241
 242         return a->store ? a->store(a, sbi, buf, len) : 0;
 243 }
 244
 245 static void f2fs_sb_release(struct kobject *kobj)
 246 {
 247         struct f2fs_sb_info *sbi = container_of(kobj, struct f2fs_sb_info,
 248                                                                 s_kobj);
 249         complete(&sbi->s_kobj_unregister);
 250 }
 251
 252 #define F2FS_ATTR_OFFSET(_struct_type, _name, _mode, _show, _store, _offset) \
 253 static struct f2fs_attr f2fs_attr_##_name = {                   \
 254         .attr = {.name = __stringify(_name), .mode = _mode },   \
 255         .show   = _show,                                        \
 256         .store  = _store,                                       \
 257         .struct_type = _struct_type,                            \
 258         .offset = _offset                                       \
 259 }
 260
 261 #define F2FS_RW_ATTR(struct_type, struct_name, name, elname)    \
 262         F2FS_ATTR_OFFSET(struct_type, name, 0644,               \
 263                 f2fs_sbi_show, f2fs_sbi_store,                  \
 264                 offsetof(struct struct_name, elname))
 265
 266 #define F2FS_GENERAL_RO_ATTR(name) \
 267 static struct f2fs_attr f2fs_attr_##name = __ATTR(name, 0444, name##_show, NULL)
 268
 269 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_min_sleep_time, min_sleep_time);
 270 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_max_sleep_time, max_sleep_time);
 271 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_no_gc_sleep_time, no_gc_sleep_time);
 272 F2FS_RW_ATTR(GC_THREAD, f2fs_gc_kthread, gc_idle, gc_idle);
 273 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, reclaim_segments, rec_prefree_segments);
 274 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards);
 275 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, batched_trim_sections, trim_sections);
 276 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);
 277 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);
 278 F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);
 279 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);
 280 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages);
 281 F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, dirty_nats_ratio, dirty_nats_ratio);
 282 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);
 283 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);
 284 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, cp_interval, interval_time[CP_TIME]);
 285 F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, idle_interval, interval_time[REQ_TIME]);
 286 #ifdef CONFIG_F2FS_FAULT_INJECTION
 287 F2FS_RW_ATTR(FAULT_INFO_RATE, f2fs_fault_info, inject_rate, inject_rate);
 288 F2FS_RW_ATTR(FAULT_INFO_TYPE, f2fs_fault_info, inject_type, inject_type);
 289 #endif
 290 F2FS_GENERAL_RO_ATTR(lifetime_write_kbytes);
 291
 292 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
 293 static struct attribute *f2fs_attrs[] = {
 294         ATTR_LIST(gc_min_sleep_time),
 295         ATTR_LIST(gc_max_sleep_time),
 296         ATTR_LIST(gc_no_gc_sleep_time),
 297         ATTR_LIST(gc_idle),
 298         ATTR_LIST(reclaim_segments),
 299         ATTR_LIST(max_small_discards),
 300         ATTR_LIST(batched_trim_sections),
 301         ATTR_LIST(ipu_policy),
 302         ATTR_LIST(min_ipu_util),
 303         ATTR_LIST(min_fsync_blocks),
 304         ATTR_LIST(max_victim_search),
 305         ATTR_LIST(dir_level),
 306         ATTR_LIST(ram_thresh),
 307         ATTR_LIST(ra_nid_pages),
 308         ATTR_LIST(dirty_nats_ratio),
 309         ATTR_LIST(cp_interval),
 310         ATTR_LIST(idle_interval),
 311         ATTR_LIST(lifetime_write_kbytes),
 312         NULL,
 313 };
 314
 315 static const struct sysfs_ops f2fs_attr_ops = {
 316         .show   = f2fs_attr_show,
 317         .store  = f2fs_attr_store,
 318 };
 319
 320 static struct kobj_type f2fs_ktype = {
 321         .default_attrs  = f2fs_attrs,
 322         .sysfs_ops      = &f2fs_attr_ops,
 323         .release        = f2fs_sb_release,
 324 };
 325
 326 #ifdef CONFIG_F2FS_FAULT_INJECTION
 327 /* sysfs for f2fs fault injection */
 328 static struct kobject f2fs_fault_inject;
 329
 330 static struct attribute *f2fs_fault_attrs[] = {
 331         ATTR_LIST(inject_rate),
 332         ATTR_LIST(inject_type),
 333         NULL
 334 };
 335
 336 static struct kobj_type f2fs_fault_ktype = {
 337         .default_attrs  = f2fs_fault_attrs,
 338         .sysfs_ops      = &f2fs_attr_ops,
 339 };
 340 #endif
 341
 342 void f2fs_msg(struct super_block *sb, const char *level, const char *fmt, ...)
 343 {
 344         struct va_format vaf;
 345         va_list args;
 346
 347         va_start(args, fmt);
 348         vaf.fmt = fmt;
 349         vaf.va = &args;
 350         printk("%sF2FS-fs (%s): %pV\n", level, sb->s_id, &vaf);
 351         va_end(args);
 352 }
 353
 354 static void init_once(void *foo)
 355 {
 356         struct f2fs_inode_info *fi = (struct f2fs_inode_info *) foo;
 357
 358         inode_init_once(&fi->vfs_inode);
 359 }
 360
 361 static int parse_options(struct super_block *sb, char *options)
 362 {
 363         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 364         struct request_queue *q;
 365         substring_t args[MAX_OPT_ARGS];
 366         char *p, *name;
 367         int arg = 0;
 368
 369 #ifdef CONFIG_F2FS_FAULT_INJECTION
 370         f2fs_build_fault_attr(0);
 371 #endif
 372
 373         if (!options)
 374                 return 0;
 375
 376         while ((p = strsep(&options, ",")) != NULL) {
 377                 int token;
 378                 if (!*p)
 379                         continue;
 380                 /*
 381                  * Initialize args struct so we know whether arg was
 382                  * found; some options take optional arguments.
 383                  */
 384                 args[0].to = args[0].from = NULL;
 385                 token = match_token(p, f2fs_tokens, args);
 386
 387                 switch (token) {
 388                 case Opt_gc_background:
 389                         name = match_strdup(&args[0]);
 390
 391                         if (!name)
 392                                 return -ENOMEM;
 393                         if (strlen(name) == 2 && !strncmp(name, "on", 2)) {
 394                                 set_opt(sbi, BG_GC);
 395                                 clear_opt(sbi, FORCE_FG_GC);
 396                         } else if (strlen(name) == 3 && !strncmp(name, "off", 3)) {
 397                                 clear_opt(sbi, BG_GC);
 398                                 clear_opt(sbi, FORCE_FG_GC);
 399                         } else if (strlen(name) == 4 && !strncmp(name, "sync", 4)) {
 400                                 set_opt(sbi, BG_GC);
 401                                 set_opt(sbi, FORCE_FG_GC);
 402                         } else {
 403                                 kfree(name);
 404                                 return -EINVAL;
 405                         }
 406                         kfree(name);
 407                         break;
 408                 case Opt_disable_roll_forward:
 409                         set_opt(sbi, DISABLE_ROLL_FORWARD);
 410                         break;
 411                 case Opt_norecovery:
 412                         /* this option mounts f2fs with ro */
 413                         set_opt(sbi, DISABLE_ROLL_FORWARD);
 414                         if (!f2fs_readonly(sb))
 415                                 return -EINVAL;
 416                         break;
 417                 case Opt_discard:
 418                         q = bdev_get_queue(sb->s_bdev);
 419                         if (blk_queue_discard(q)) {
 420                                 set_opt(sbi, DISCARD);
 421                         } else {
 422                                 f2fs_msg(sb, KERN_WARNING,
 423                                         "mounting with \"discard\" option, but "
 424                                         "the device does not support discard");
 425                         }
 426                         break;
 427                 case Opt_noheap:
 428                         set_opt(sbi, NOHEAP);
 429                         break;
 430 #ifdef CONFIG_F2FS_FS_XATTR
 431                 case Opt_user_xattr:
 432                         set_opt(sbi, XATTR_USER);
 433                         break;
 434                 case Opt_nouser_xattr:
 435                         clear_opt(sbi, XATTR_USER);
 436                         break;
 437                 case Opt_inline_xattr:
 438                         set_opt(sbi, INLINE_XATTR);
 439                         break;
 440 #else
 441                 case Opt_user_xattr:
 442                         f2fs_msg(sb, KERN_INFO,
 443                                 "user_xattr options not supported");
 444                         break;
 445                 case Opt_nouser_xattr:
 446                         f2fs_msg(sb, KERN_INFO,
 447                                 "nouser_xattr options not supported");
 448                         break;
 449                 case Opt_inline_xattr:
 450                         f2fs_msg(sb, KERN_INFO,
 451                                 "inline_xattr options not supported");
 452                         break;
 453 #endif
 454 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 455                 case Opt_acl:
 456                         set_opt(sbi, POSIX_ACL);
 457                         break;
 458                 case Opt_noacl:
 459                         clear_opt(sbi, POSIX_ACL);
 460                         break;
 461 #else
 462                 case Opt_acl:
 463                         f2fs_msg(sb, KERN_INFO, "acl options not supported");
 464                         break;
 465                 case Opt_noacl:
 466                         f2fs_msg(sb, KERN_INFO, "noacl options not supported");
 467                         break;
 468 #endif
 469                 case Opt_active_logs:
 470                         if (args->from && match_int(args, &arg))
 471                                 return -EINVAL;
 472                         if (arg != 2 && arg != 4 && arg != NR_CURSEG_TYPE)
 473                                 return -EINVAL;
 474                         sbi->active_logs = arg;
 475                         break;
 476                 case Opt_disable_ext_identify:
 477                         set_opt(sbi, DISABLE_EXT_IDENTIFY);
 478                         break;
 479                 case Opt_inline_data:
 480                         set_opt(sbi, INLINE_DATA);
 481                         break;
 482                 case Opt_inline_dentry:
 483                         set_opt(sbi, INLINE_DENTRY);
 484                         break;
 485                 case Opt_flush_merge:
 486                         set_opt(sbi, FLUSH_MERGE);
 487                         break;
 488                 case Opt_noflush_merge:
 489                         clear_opt(sbi, FLUSH_MERGE);
 490                         break;
 491                 case Opt_nobarrier:
 492                         set_opt(sbi, NOBARRIER);
 493                         break;
 494                 case Opt_fastboot:
 495                         set_opt(sbi, FASTBOOT);
 496                         break;
 497                 case Opt_extent_cache:
 498                         set_opt(sbi, EXTENT_CACHE);
 499                         break;
 500                 case Opt_noextent_cache:
 501                         clear_opt(sbi, EXTENT_CACHE);
 502                         break;
 503                 case Opt_noinline_data:
 504                         clear_opt(sbi, INLINE_DATA);
 505                         break;
 506                 case Opt_data_flush:
 507                         set_opt(sbi, DATA_FLUSH);
 508                         break;
 509                 case Opt_fault_injection:
 510                         if (args->from && match_int(args, &arg))
 511                                 return -EINVAL;
 512 #ifdef CONFIG_F2FS_FAULT_INJECTION
 513                         f2fs_build_fault_attr(arg);
 514 #else
 515                         f2fs_msg(sb, KERN_INFO,
 516                                 "FAULT_INJECTION was not selected");
 517 #endif
 518                         break;
 519                 case Opt_lazytime:
 520                         sb->s_flags |= MS_LAZYTIME;
 521                         break;
 522                 case Opt_nolazytime:
 523                         sb->s_flags &= ~MS_LAZYTIME;
 524                         break;
 525                 default:
 526                         f2fs_msg(sb, KERN_ERR,
 527                                 "Unrecognized mount option \"%s\" or missing value",
 528                                 p);
 529                         return -EINVAL;
 530                 }
 531         }
 532         return 0;
 533 }
 534
 535 static struct inode *f2fs_alloc_inode(struct super_block *sb)
 536 {
 537         struct f2fs_inode_info *fi;
 538
 539         fi = kmem_cache_alloc(f2fs_inode_cachep, GFP_F2FS_ZERO);
 540         if (!fi)
 541                 return NULL;
 542
 543         init_once((void *) fi);
 544
 545         if (percpu_counter_init(&fi->dirty_pages, 0, GFP_NOFS)) {
 546                 kmem_cache_free(f2fs_inode_cachep, fi);
 547                 return NULL;
 548         }
 549
 550         /* Initialize f2fs-specific inode info */
 551         fi->vfs_inode.i_version = 1;
 552         fi->i_current_depth = 1;
 553         fi->i_advise = 0;
 554         init_rwsem(&fi->i_sem);
 555         INIT_LIST_HEAD(&fi->dirty_list);
 556         INIT_LIST_HEAD(&fi->gdirty_list);
 557         INIT_LIST_HEAD(&fi->inmem_pages);
 558         mutex_init(&fi->inmem_lock);
 559
 560         /* Will be used by directory only */
 561         fi->i_dir_level = F2FS_SB(sb)->dir_level;
 562         return &fi->vfs_inode;
 563 }
 564
 565 static int f2fs_drop_inode(struct inode *inode)
 566 {
 567         int ret;
 568
 569         /*
 570          * This is to avoid a deadlock condition like below.
 571          * writeback_single_inode(inode)
 572          *  - f2fs_write_data_page
 573          *    - f2fs_gc -> iput -> evict
 574          *       - inode_wait_for_writeback(inode)
 575          */
 576         if ((!inode_unhashed(inode) && inode->i_state & I_SYNC)) {
 577                 if (!inode->i_nlink && !is_bad_inode(inode)) {
 578                         /* to avoid evict_inode call simultaneously */
 579                         atomic_inc(&inode->i_count);
 580                         spin_unlock(&inode->i_lock);
 581
 582                         /* some remained atomic pages should discarded */
 583                         if (f2fs_is_atomic_file(inode))
 584                                 drop_inmem_pages(inode);
 585
 586                         /* should remain fi->extent_tree for writepage */
 587                         f2fs_destroy_extent_node(inode);
 588
 589                         sb_start_intwrite(inode->i_sb);
 590                         f2fs_i_size_write(inode, 0);
 591
 592                         if (F2FS_HAS_BLOCKS(inode))
 593                                 f2fs_truncate(inode);
 594
 595                         sb_end_intwrite(inode->i_sb);
 596
 597                         fscrypt_put_encryption_info(inode, NULL);
 598                         spin_lock(&inode->i_lock);
 599                         atomic_dec(&inode->i_count);
 600                 }
 601                 return 0;
 602         }
 603
 604         ret = generic_drop_inode(inode);
 605         if (is_inode_flag_set(inode, FI_DIRTY_INODE)) {
 606                 if (ret)
 607                         inode->i_state |= I_WILL_FREE;
 608                 spin_unlock(&inode->i_lock);
 609
 610                 update_inode_page(inode);
 611
 612                 spin_lock(&inode->i_lock);
 613                 if (ret)
 614                         inode->i_state &= ~I_WILL_FREE;
 615         }
 616         return ret;
 617 }
 618
 619 /*
 620  * f2fs_dirty_inode() is called from __mark_inode_dirty()
 621  *
 622  * We should call set_dirty_inode to write the dirty inode through write_inode.
 623  */
 624 static void f2fs_dirty_inode(struct inode *inode, int flags)
 625 {
 626         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 627
 628         if (inode->i_ino == F2FS_NODE_INO(sbi) ||
 629                         inode->i_ino == F2FS_META_INO(sbi))
 630                 return;
 631
 632         if (flags == I_DIRTY_TIME)
 633                 return;
 634
 635         if (is_inode_flag_set(inode, FI_AUTO_RECOVER))
 636                 clear_inode_flag(inode, FI_AUTO_RECOVER);
 637
 638         spin_lock(&sbi->inode_lock[DIRTY_META]);
 639         if (is_inode_flag_set(inode, FI_DIRTY_INODE)) {
 640                 spin_unlock(&sbi->inode_lock[DIRTY_META]);
 641                 return;
 642         }
 643
 644         set_inode_flag(inode, FI_DIRTY_INODE);
 645         list_add_tail(&F2FS_I(inode)->gdirty_list,
 646                                 &sbi->inode_list[DIRTY_META]);
 647         inc_page_count(sbi, F2FS_DIRTY_IMETA);
 648         stat_inc_dirty_inode(sbi, DIRTY_META);
 649         spin_unlock(&sbi->inode_lock[DIRTY_META]);
 650 }
 651
 652 void f2fs_inode_synced(struct inode *inode)
 653 {
 654         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 655
 656         spin_lock(&sbi->inode_lock[DIRTY_META]);
 657         if (!is_inode_flag_set(inode, FI_DIRTY_INODE)) {
 658                 spin_unlock(&sbi->inode_lock[DIRTY_META]);
 659                 return;
 660         }
 661         list_del_init(&F2FS_I(inode)->gdirty_list);
 662         clear_inode_flag(inode, FI_DIRTY_INODE);
 663         clear_inode_flag(inode, FI_AUTO_RECOVER);
 664         dec_page_count(sbi, F2FS_DIRTY_IMETA);
 665         stat_dec_dirty_inode(F2FS_I_SB(inode), DIRTY_META);
 666         spin_unlock(&sbi->inode_lock[DIRTY_META]);
 667 }
 668
 669 static void f2fs_i_callback(struct rcu_head *head)
 670 {
 671         struct inode *inode = container_of(head, struct inode, i_rcu);
 672         kmem_cache_free(f2fs_inode_cachep, F2FS_I(inode));
 673 }
 674
 675 static void f2fs_destroy_inode(struct inode *inode)
 676 {
 677         percpu_counter_destroy(&F2FS_I(inode)->dirty_pages);
 678         call_rcu(&inode->i_rcu, f2fs_i_callback);
 679 }
 680
 681 static void destroy_percpu_info(struct f2fs_sb_info *sbi)
 682 {
 683         int i;
 684
 685         for (i = 0; i < NR_COUNT_TYPE; i++)
 686                 percpu_counter_destroy(&sbi->nr_pages[i]);
 687         percpu_counter_destroy(&sbi->alloc_valid_block_count);
 688         percpu_counter_destroy(&sbi->total_valid_inode_count);
 689 }
 690
 691 static void f2fs_put_super(struct super_block *sb)
 692 {
 693         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 694
 695         if (sbi->s_proc) {
 696                 remove_proc_entry("segment_info", sbi->s_proc);
 697                 remove_proc_entry("segment_bits", sbi->s_proc);
 698                 remove_proc_entry(sb->s_id, f2fs_proc_root);
 699         }
 700         kobject_del(&sbi->s_kobj);
 701
 702         stop_gc_thread(sbi);
 703
 704         /* prevent remaining shrinker jobs */
 705         mutex_lock(&sbi->umount_mutex);
 706
 707         /*
 708          * We don't need to do checkpoint when superblock is clean.
 709          * But, the previous checkpoint was not done by umount, it needs to do
 710          * clean checkpoint again.
 711          */
 712         if (is_sbi_flag_set(sbi, SBI_IS_DIRTY) ||
 713                         !is_set_ckpt_flags(F2FS_CKPT(sbi), CP_UMOUNT_FLAG)) {
 714                 struct cp_control cpc = {
 715                         .reason = CP_UMOUNT,
 716                 };
 717                 write_checkpoint(sbi, &cpc);
 718         }
 719
 720         /* write_checkpoint can update stat informaion */
 721         f2fs_destroy_stats(sbi);
 722
 723         /*
 724          * normally superblock is clean, so we need to release this.
 725          * In addition, EIO will skip do checkpoint, we need this as well.
 726          */
 727         release_ino_entry(sbi, true);
 728         release_discard_addrs(sbi);
 729
 730         f2fs_leave_shrinker(sbi);
 731         mutex_unlock(&sbi->umount_mutex);
 732
 733         /* our cp_error case, we can wait for any writeback page */
 734         f2fs_flush_merged_bios(sbi);
 735
 736         iput(sbi->node_inode);
 737         iput(sbi->meta_inode);
 738
 739         /* destroy f2fs internal modules */
 740         destroy_node_manager(sbi);
 741         destroy_segment_manager(sbi);
 742
 743         kfree(sbi->ckpt);
 744         kobject_put(&sbi->s_kobj);
 745         wait_for_completion(&sbi->s_kobj_unregister);
 746
 747         sb->s_fs_info = NULL;
 748         if (sbi->s_chksum_driver)
 749                 crypto_free_shash(sbi->s_chksum_driver);
 750         kfree(sbi->raw_super);
 751
 752         destroy_percpu_info(sbi);
 753         kfree(sbi);
 754 }
 755
 756 int f2fs_sync_fs(struct super_block *sb, int sync)
 757 {
 758         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 759         int err = 0;
 760
 761         trace_f2fs_sync_fs(sb, sync);
 762
 763         if (sync) {
 764                 struct cp_control cpc;
 765
 766                 cpc.reason = __get_cp_reason(sbi);
 767
 768                 mutex_lock(&sbi->gc_mutex);
 769                 err = write_checkpoint(sbi, &cpc);
 770                 mutex_unlock(&sbi->gc_mutex);
 771         }
 772         f2fs_trace_ios(NULL, 1);
 773
 774         return err;
 775 }
 776
 777 static int f2fs_freeze(struct super_block *sb)
 778 {
 779         int err;
 780
 781         if (f2fs_readonly(sb))
 782                 return 0;
 783
 784         err = f2fs_sync_fs(sb, 1);
 785         return err;
 786 }
 787
 788 static int f2fs_unfreeze(struct super_block *sb)
 789 {
 790         return 0;
 791 }
 792
 793 static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
 794 {
 795         struct super_block *sb = dentry->d_sb;
 796         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 797         u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
 798         block_t total_count, user_block_count, start_count, ovp_count;
 799
 800         total_count = le64_to_cpu(sbi->raw_super->block_count);
 801         user_block_count = sbi->user_block_count;
 802         start_count = le32_to_cpu(sbi->raw_super->segment0_blkaddr);
 803         ovp_count = SM_I(sbi)->ovp_segments << sbi->log_blocks_per_seg;
 804         buf->f_type = F2FS_SUPER_MAGIC;
 805         buf->f_bsize = sbi->blocksize;
 806
 807         buf->f_blocks = total_count - start_count;
 808         buf->f_bfree = buf->f_blocks - valid_user_blocks(sbi) - ovp_count;
 809         buf->f_bavail = user_block_count - valid_user_blocks(sbi);
 810
 811         buf->f_files = sbi->total_node_count - F2FS_RESERVED_NODE_NUM;
 812         buf->f_ffree = buf->f_files - valid_inode_count(sbi);
 813
 814         buf->f_namelen = F2FS_NAME_LEN;
 815         buf->f_fsid.val[0] = (u32)id;
 816         buf->f_fsid.val[1] = (u32)(id >> 32);
 817
 818         return 0;
 819 }
 820
 821 static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
 822 {
 823         struct f2fs_sb_info *sbi = F2FS_SB(root->d_sb);
 824
 825         if (!f2fs_readonly(sbi->sb) && test_opt(sbi, BG_GC)) {
 826                 if (test_opt(sbi, FORCE_FG_GC))
 827                         seq_printf(seq, ",background_gc=%s", "sync");
 828                 else
 829                         seq_printf(seq, ",background_gc=%s", "on");
 830         } else {
 831                 seq_printf(seq, ",background_gc=%s", "off");
 832         }
 833         if (test_opt(sbi, DISABLE_ROLL_FORWARD))
 834                 seq_puts(seq, ",disable_roll_forward");
 835         if (test_opt(sbi, DISCARD))
 836                 seq_puts(seq, ",discard");
 837         if (test_opt(sbi, NOHEAP))
 838                 seq_puts(seq, ",no_heap_alloc");
 839 #ifdef CONFIG_F2FS_FS_XATTR
 840         if (test_opt(sbi, XATTR_USER))
 841                 seq_puts(seq, ",user_xattr");
 842         else
 843                 seq_puts(seq, ",nouser_xattr");
 844         if (test_opt(sbi, INLINE_XATTR))
 845                 seq_puts(seq, ",inline_xattr");
 846 #endif
 847 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 848         if (test_opt(sbi, POSIX_ACL))
 849                 seq_puts(seq, ",acl");
 850         else
 851                 seq_puts(seq, ",noacl");
 852 #endif
 853         if (test_opt(sbi, DISABLE_EXT_IDENTIFY))
 854                 seq_puts(seq, ",disable_ext_identify");
 855         if (test_opt(sbi, INLINE_DATA))
 856                 seq_puts(seq, ",inline_data");
 857         else
 858                 seq_puts(seq, ",noinline_data");
 859         if (test_opt(sbi, INLINE_DENTRY))
 860                 seq_puts(seq, ",inline_dentry");
 861         if (!f2fs_readonly(sbi->sb) && test_opt(sbi, FLUSH_MERGE))
 862                 seq_puts(seq, ",flush_merge");
 863         if (test_opt(sbi, NOBARRIER))
 864                 seq_puts(seq, ",nobarrier");
 865         if (test_opt(sbi, FASTBOOT))
 866                 seq_puts(seq, ",fastboot");
 867         if (test_opt(sbi, EXTENT_CACHE))
 868                 seq_puts(seq, ",extent_cache");
 869         else
 870                 seq_puts(seq, ",noextent_cache");
 871         if (test_opt(sbi, DATA_FLUSH))
 872                 seq_puts(seq, ",data_flush");
 873         seq_printf(seq, ",active_logs=%u", sbi->active_logs);
 874
 875         return 0;
 876 }
 877
 878 static int segment_info_seq_show(struct seq_file *seq, void *offset)
 879 {
 880         struct super_block *sb = seq->private;
 881         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 882         unsigned int total_segs =
 883                         le32_to_cpu(sbi->raw_super->segment_count_main);
 884         int i;
 885
 886         seq_puts(seq, "format: segment_type|valid_blocks\n"
 887                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
 888
 889         for (i = 0; i < total_segs; i++) {
 890                 struct seg_entry *se = get_seg_entry(sbi, i);
 891
 892                 if ((i % 10) == 0)
 893                         seq_printf(seq, "%-10d", i);
 894                 seq_printf(seq, "%d|%-3u", se->type,
 895                                         get_valid_blocks(sbi, i, 1));
 896                 if ((i % 10) == 9 || i == (total_segs - 1))
 897                         seq_putc(seq, '\n');
 898                 else
 899                         seq_putc(seq, ' ');
 900         }
 901
 902         return 0;
 903 }
 904
 905 static int segment_bits_seq_show(struct seq_file *seq, void *offset)
 906 {
 907         struct super_block *sb = seq->private;
 908         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 909         unsigned int total_segs =
 910                         le32_to_cpu(sbi->raw_super->segment_count_main);
 911         int i, j;
 912
 913         seq_puts(seq, "format: segment_type|valid_blocks|bitmaps\n"
 914                 "segment_type(0:HD, 1:WD, 2:CD, 3:HN, 4:WN, 5:CN)\n");
 915
 916         for (i = 0; i < total_segs; i++) {
 917                 struct seg_entry *se = get_seg_entry(sbi, i);
 918
 919                 seq_printf(seq, "%-10d", i);
 920                 seq_printf(seq, "%d|%-3u|", se->type,
 921                                         get_valid_blocks(sbi, i, 1));
 922                 for (j = 0; j < SIT_VBLOCK_MAP_SIZE; j++)
 923                         seq_printf(seq, "%x ", se->cur_valid_map[j]);
 924                 seq_putc(seq, '\n');
 925         }
 926         return 0;
 927 }
 928
 929 #define F2FS_PROC_FILE_DEF(_name)                                       \
 930 static int _name##_open_fs(struct inode *inode, struct file *file)      \
 931 {                                                                       \
 932         return single_open(file, _name##_seq_show, PDE_DATA(inode));    \
 933 }                                                                       \
 934                                                                         \
 935 static const struct file_operations f2fs_seq_##_name##_fops = {         \
 936         .owner = THIS_MODULE,                                           \
 937         .open = _name##_open_fs,                                        \
 938         .read = seq_read,                                               \
 939         .llseek = seq_lseek,                                            \
 940         .release = single_release,                                      \
 941 };
 942
 943 F2FS_PROC_FILE_DEF(segment_info);
 944 F2FS_PROC_FILE_DEF(segment_bits);
 945
 946 static void default_options(struct f2fs_sb_info *sbi)
 947 {
 948         /* init some FS parameters */
 949         sbi->active_logs = NR_CURSEG_TYPE;
 950
 951         set_opt(sbi, BG_GC);
 952         set_opt(sbi, INLINE_DATA);
 953         set_opt(sbi, EXTENT_CACHE);
 954         sbi->sb->s_flags |= MS_LAZYTIME;
 955         set_opt(sbi, FLUSH_MERGE);
 956
 957 #ifdef CONFIG_F2FS_FS_XATTR
 958         set_opt(sbi, XATTR_USER);
 959 #endif
 960 #ifdef CONFIG_F2FS_FS_POSIX_ACL
 961         set_opt(sbi, POSIX_ACL);
 962 #endif
 963 }
 964
 965 static int f2fs_remount(struct super_block *sb, int *flags, char *data)
 966 {
 967         struct f2fs_sb_info *sbi = F2FS_SB(sb);
 968         struct f2fs_mount_info org_mount_opt;
 969         int err, active_logs;
 970         bool need_restart_gc = false;
 971         bool need_stop_gc = false;
 972         bool no_extent_cache = !test_opt(sbi, EXTENT_CACHE);
 973
 974         /*
 975          * Save the old mount options in case we
 976          * need to restore them.
 977          */
 978         org_mount_opt = sbi->mount_opt;
 979         active_logs = sbi->active_logs;
 980
 981         /* recover superblocks we couldn't write due to previous RO mount */
 982         if (!(*flags & MS_RDONLY) && is_sbi_flag_set(sbi, SBI_NEED_SB_WRITE)) {
 983                 err = f2fs_commit_super(sbi, false);
 984                 f2fs_msg(sb, KERN_INFO,
 985                         "Try to recover all the superblocks, ret: %d", err);
 986                 if (!err)
 987                         clear_sbi_flag(sbi, SBI_NEED_SB_WRITE);
 988         }
 989
 990         sbi->mount_opt.opt = 0;
 991         default_options(sbi);
 992
 993         /* parse mount options */
 994         err = parse_options(sb, data);
 995         if (err)
 996                 goto restore_opts;
 997
 998         /*
 999          * Previous and new state of filesystem is RO,
1000          * so skip checking GC and FLUSH_MERGE conditions.
1001          */
1002         if (f2fs_readonly(sb) && (*flags & MS_RDONLY))
1003                 goto skip;
1004
1005         /* disallow enable/disable extent_cache dynamically */
1006         if (no_extent_cache == !!test_opt(sbi, EXTENT_CACHE)) {
1007                 err = -EINVAL;
1008                 f2fs_msg(sbi->sb, KERN_WARNING,
1009                                 "switch extent_cache option is not allowed");
1010                 goto restore_opts;
1011         }
1012
1013         /*
1014          * We stop the GC thread if FS is mounted as RO
1015          * or if background_gc = off is passed in mount
1016          * option. Also sync the filesystem.
1017          */
1018         if ((*flags & MS_RDONLY) || !test_opt(sbi, BG_GC)) {
1019                 if (sbi->gc_thread) {
1020                         stop_gc_thread(sbi);
1021                         need_restart_gc = true;
1022                 }
1023         } else if (!sbi->gc_thread) {
1024                 err = start_gc_thread(sbi);
1025                 if (err)
1026                         goto restore_opts;
1027                 need_stop_gc = true;
1028         }
1029
1030         if (*flags & MS_RDONLY) {
1031                 writeback_inodes_sb(sb, WB_REASON_SYNC);
1032                 sync_inodes_sb(sb);
1033
1034                 set_sbi_flag(sbi, SBI_IS_DIRTY);
1035                 set_sbi_flag(sbi, SBI_IS_CLOSE);
1036                 f2fs_sync_fs(sb, 1);
1037                 clear_sbi_flag(sbi, SBI_IS_CLOSE);
1038         }
1039
1040         /*
1041          * We stop issue flush thread if FS is mounted as RO
1042          * or if flush_merge is not passed in mount option.
1043          */
1044         if ((*flags & MS_RDONLY) || !test_opt(sbi, FLUSH_MERGE)) {
1045                 destroy_flush_cmd_control(sbi);
1046         } else if (!SM_I(sbi)->cmd_control_info) {
1047                 err = create_flush_cmd_control(sbi);
1048                 if (err)
1049                         goto restore_gc;
1050         }
1051 skip:
1052         /* Update the POSIXACL Flag */
1053         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1054                 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
1055
1056         return 0;
1057 restore_gc:
1058         if (need_restart_gc) {
1059                 if (start_gc_thread(sbi))
1060                         f2fs_msg(sbi->sb, KERN_WARNING,
1061                                 "background gc thread has stopped");
1062         } else if (need_stop_gc) {
1063                 stop_gc_thread(sbi);
1064         }
1065 restore_opts:
1066         sbi->mount_opt = org_mount_opt;
1067         sbi->active_logs = active_logs;
1068         return err;
1069 }
1070
1071 static struct super_operations f2fs_sops = {
1072         .alloc_inode    = f2fs_alloc_inode,
1073         .drop_inode     = f2fs_drop_inode,
1074         .destroy_inode  = f2fs_destroy_inode,
1075         .write_inode    = f2fs_write_inode,
1076         .dirty_inode    = f2fs_dirty_inode,
1077         .show_options   = f2fs_show_options,
1078         .evict_inode    = f2fs_evict_inode,
1079         .put_super      = f2fs_put_super,
1080         .sync_fs        = f2fs_sync_fs,
1081         .freeze_fs      = f2fs_freeze,
1082         .unfreeze_fs    = f2fs_unfreeze,
1083         .statfs         = f2fs_statfs,
1084         .remount_fs     = f2fs_remount,
1085 };
1086
1087 #ifdef CONFIG_F2FS_FS_ENCRYPTION
1088 static int f2fs_get_context(struct inode *inode, void *ctx, size_t len)
1089 {
1090         return f2fs_getxattr(inode, F2FS_XATTR_INDEX_ENCRYPTION,
1091                                 F2FS_XATTR_NAME_ENCRYPTION_CONTEXT,
1092                                 ctx, len, NULL);
1093 }
1094
1095 static int f2fs_key_prefix(struct inode *inode, u8 **key)
1096 {
1097         *key = F2FS_I_SB(inode)->key_prefix;
1098         return F2FS_I_SB(inode)->key_prefix_size;
1099 }
1100
1101 static int f2fs_set_context(struct inode *inode, const void *ctx, size_t len,
1102                                                         void *fs_data)
1103 {
1104         return f2fs_setxattr(inode, F2FS_XATTR_INDEX_ENCRYPTION,
1105                                 F2FS_XATTR_NAME_ENCRYPTION_CONTEXT,
1106                                 ctx, len, fs_data, XATTR_CREATE);
1107 }
1108
1109 static unsigned f2fs_max_namelen(struct inode *inode)
1110 {
1111         return S_ISLNK(inode->i_mode) ?
1112                         inode->i_sb->s_blocksize : F2FS_NAME_LEN;
1113 }
1114
1115 static struct fscrypt_operations f2fs_cryptops = {
1116         .get_context    = f2fs_get_context,
1117         .key_prefix     = f2fs_key_prefix,
1118         .set_context    = f2fs_set_context,
1119         .is_encrypted   = f2fs_encrypted_inode,
1120         .empty_dir      = f2fs_empty_dir,
1121         .max_namelen    = f2fs_max_namelen,
1122 };
1123 #else
1124 static struct fscrypt_operations f2fs_cryptops = {
1125         .is_encrypted   = f2fs_encrypted_inode,
1126 };
1127 #endif
1128
1129 static struct inode *f2fs_nfs_get_inode(struct super_block *sb,
1130                 u64 ino, u32 generation)
1131 {
1132         struct f2fs_sb_info *sbi = F2FS_SB(sb);
1133         struct inode *inode;
1134
1135         if (check_nid_range(sbi, ino))
1136                 return ERR_PTR(-ESTALE);
1137
1138         /*
1139          * f2fs_iget isn't quite right if the inode is currently unallocated!
1140          * However f2fs_iget currently does appropriate checks to handle stale
1141          * inodes so everything is OK.
1142          */
1143         inode = f2fs_iget(sb, ino);
1144         if (IS_ERR(inode))
1145                 return ERR_CAST(inode);
1146         if (unlikely(generation && inode->i_generation != generation)) {
1147                 /* we didn't find the right inode.. */
1148                 iput(inode);
1149                 return ERR_PTR(-ESTALE);
1150         }
1151         return inode;
1152 }
1153
1154 static struct dentry *f2fs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1155                 int fh_len, int fh_type)
1156 {
1157         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1158                                     f2fs_nfs_get_inode);
1159 }
1160
1161 static struct dentry *f2fs_fh_to_parent(struct super_block *sb, struct fid *fid,
1162                 int fh_len, int fh_type)
1163 {
1164         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1165                                     f2fs_nfs_get_inode);
1166 }
1167
1168 static const struct export_operations f2fs_export_ops = {
1169         .fh_to_dentry = f2fs_fh_to_dentry,
1170         .fh_to_parent = f2fs_fh_to_parent,
1171         .get_parent = f2fs_get_parent,
1172 };
1173
1174 static loff_t max_file_blocks(void)
1175 {
1176         loff_t result = (DEF_ADDRS_PER_INODE - F2FS_INLINE_XATTR_ADDRS);
1177         loff_t leaf_count = ADDRS_PER_BLOCK;
1178
1179         /* two direct node blocks */
1180         result += (leaf_count * 2);
1181
1182         /* two indirect node blocks */
1183         leaf_count *= NIDS_PER_BLOCK;
1184         result += (leaf_count * 2);
1185
1186         /* one double indirect node block */
1187         leaf_count *= NIDS_PER_BLOCK;
1188         result += leaf_count;
1189
1190         return result;
1191 }
1192
1193 static int __f2fs_commit_super(struct buffer_head *bh,
1194                         struct f2fs_super_block *super)
1195 {
1196         lock_buffer(bh);
1197         if (super)
1198                 memcpy(bh->b_data + F2FS_SUPER_OFFSET, super, sizeof(*super));
1199         set_buffer_uptodate(bh);
1200         set_buffer_dirty(bh);
1201         unlock_buffer(bh);
1202
1203         /* it's rare case, we can do fua all the time */
1204         return __sync_dirty_buffer(bh, WRITE_FLUSH_FUA);
1205 }
1206
1207 static inline bool sanity_check_area_boundary(struct f2fs_sb_info *sbi,
1208                                         struct buffer_head *bh)
1209 {
1210         struct f2fs_super_block *raw_super = (struct f2fs_super_block *)
1211                                         (bh->b_data + F2FS_SUPER_OFFSET);
1212         struct super_block *sb = sbi->sb;
1213         u32 segment0_blkaddr = le32_to_cpu(raw_super->segment0_blkaddr);
1214         u32 cp_blkaddr = le32_to_cpu(raw_super->cp_blkaddr);
1215         u32 sit_blkaddr = le32_to_cpu(raw_super->sit_blkaddr);
1216         u32 nat_blkaddr = le32_to_cpu(raw_super->nat_blkaddr);
1217         u32 ssa_blkaddr = le32_to_cpu(raw_super->ssa_blkaddr);
1218         u32 main_blkaddr = le32_to_cpu(raw_super->main_blkaddr);
1219         u32 segment_count_ckpt = le32_to_cpu(raw_super->segment_count_ckpt);
1220         u32 segment_count_sit = le32_to_cpu(raw_super->segment_count_sit);
1221         u32 segment_count_nat = le32_to_cpu(raw_super->segment_count_nat);
1222         u32 segment_count_ssa = le32_to_cpu(raw_super->segment_count_ssa);
1223         u32 segment_count_main = le32_to_cpu(raw_super->segment_count_main);
1224         u32 segment_count = le32_to_cpu(raw_super->segment_count);
1225         u32 log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
1226         u64 main_end_blkaddr = main_blkaddr +
1227                                 (segment_count_main << log_blocks_per_seg);
1228         u64 seg_end_blkaddr = segment0_blkaddr +
1229                                 (segment_count << log_blocks_per_seg);
1230
1231         if (segment0_blkaddr != cp_blkaddr) {
1232                 f2fs_msg(sb, KERN_INFO,
1233                         "Mismatch start address, segment0(%u) cp_blkaddr(%u)",
1234                         segment0_blkaddr, cp_blkaddr);
1235                 return true;
1236         }
1237
1238         if (cp_blkaddr + (segment_count_ckpt << log_blocks_per_seg) !=
1239                                                         sit_blkaddr) {
1240                 f2fs_msg(sb, KERN_INFO,
1241                         "Wrong CP boundary, start(%u) end(%u) blocks(%u)",
1242                         cp_blkaddr, sit_blkaddr,
1243                         segment_count_ckpt << log_blocks_per_seg);
1244                 return true;
1245         }
1246
1247         if (sit_blkaddr + (segment_count_sit << log_blocks_per_seg) !=
1248                                                         nat_blkaddr) {
1249                 f2fs_msg(sb, KERN_INFO,
1250                         "Wrong SIT boundary, start(%u) end(%u) blocks(%u)",
1251                         sit_blkaddr, nat_blkaddr,
1252                         segment_count_sit << log_blocks_per_seg);
1253                 return true;
1254         }
1255
1256         if (nat_blkaddr + (segment_count_nat << log_blocks_per_seg) !=
1257                                                         ssa_blkaddr) {
1258                 f2fs_msg(sb, KERN_INFO,
1259                         "Wrong NAT boundary, start(%u) end(%u) blocks(%u)",
1260                         nat_blkaddr, ssa_blkaddr,
1261                         segment_count_nat << log_blocks_per_seg);
1262                 return true;
1263         }
1264
1265         if (ssa_blkaddr + (segment_count_ssa << log_blocks_per_seg) !=
1266                                                         main_blkaddr) {
1267                 f2fs_msg(sb, KERN_INFO,
1268                         "Wrong SSA boundary, start(%u) end(%u) blocks(%u)",
1269                         ssa_blkaddr, main_blkaddr,
1270                         segment_count_ssa << log_blocks_per_seg);
1271                 return true;
1272         }
1273
1274         if (main_end_blkaddr > seg_end_blkaddr) {
1275                 f2fs_msg(sb, KERN_INFO,
1276                         "Wrong MAIN_AREA boundary, start(%u) end(%u) block(%u)",
1277                         main_blkaddr,
1278                         segment0_blkaddr +
1279                                 (segment_count << log_blocks_per_seg),
1280                         segment_count_main << log_blocks_per_seg);
1281                 return true;
1282         } else if (main_end_blkaddr < seg_end_blkaddr) {
1283                 int err = 0;
1284                 char *res;
1285
1286                 /* fix in-memory information all the time */
1287                 raw_super->segment_count = cpu_to_le32((main_end_blkaddr -
1288                                 segment0_blkaddr) >> log_blocks_per_seg);
1289
1290                 if (f2fs_readonly(sb) || bdev_read_only(sb->s_bdev)) {
1291                         set_sbi_flag(sbi, SBI_NEED_SB_WRITE);
1292                         res = "internally";
1293                 } else {
1294                         err = __f2fs_commit_super(bh, NULL);
1295                         res = err ? "failed" : "done";
1296                 }
1297                 f2fs_msg(sb, KERN_INFO,
1298                         "Fix alignment : %s, start(%u) end(%u) block(%u)",
1299                         res, main_blkaddr,
1300                         segment0_blkaddr +
1301                                 (segment_count << log_blocks_per_seg),
1302                         segment_count_main << log_blocks_per_seg);
1303                 if (err)
1304                         return true;
1305         }
1306         return false;
1307 }
1308
1309 static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
1310                                 struct buffer_head *bh)
1311 {
1312         struct f2fs_super_block *raw_super = (struct f2fs_super_block *)
1313                                         (bh->b_data + F2FS_SUPER_OFFSET);
1314         struct super_block *sb = sbi->sb;
1315         unsigned int blocksize;
1316
1317         if (F2FS_SUPER_MAGIC != le32_to_cpu(raw_super->magic)) {
1318                 f2fs_msg(sb, KERN_INFO,
1319                         "Magic Mismatch, valid(0x%x) - read(0x%x)",
1320                         F2FS_SUPER_MAGIC, le32_to_cpu(raw_super->magic));
1321                 return 1;
1322         }
1323
1324         /* Currently, support only 4KB page cache size */
1325         if (F2FS_BLKSIZE != PAGE_SIZE) {
1326                 f2fs_msg(sb, KERN_INFO,
1327                         "Invalid page_cache_size (%lu), supports only 4KB\n",
1328                         PAGE_SIZE);
1329                 return 1;
1330         }
1331
1332         /* Currently, support only 4KB block size */
1333         blocksize = 1 << le32_to_cpu(raw_super->log_blocksize);
1334         if (blocksize != F2FS_BLKSIZE) {
1335                 f2fs_msg(sb, KERN_INFO,
1336                         "Invalid blocksize (%u), supports only 4KB\n",
1337                         blocksize);
1338                 return 1;
1339         }
1340
1341         /* check log blocks per segment */
1342         if (le32_to_cpu(raw_super->log_blocks_per_seg) != 9) {
1343                 f2fs_msg(sb, KERN_INFO,
1344                         "Invalid log blocks per segment (%u)\n",
1345                         le32_to_cpu(raw_super->log_blocks_per_seg));
1346                 return 1;
1347         }
1348
1349         /* Currently, support 512/1024/2048/4096 bytes sector size */
1350         if (le32_to_cpu(raw_super->log_sectorsize) >
1351                                 F2FS_MAX_LOG_SECTOR_SIZE ||
1352                 le32_to_cpu(raw_super->log_sectorsize) <
1353                                 F2FS_MIN_LOG_SECTOR_SIZE) {
1354                 f2fs_msg(sb, KERN_INFO, "Invalid log sectorsize (%u)",
1355                         le32_to_cpu(raw_super->log_sectorsize));
1356                 return 1;
1357         }
1358         if (le32_to_cpu(raw_super->log_sectors_per_block) +
1359                 le32_to_cpu(raw_super->log_sectorsize) !=
1360                         F2FS_MAX_LOG_SECTOR_SIZE) {
1361                 f2fs_msg(sb, KERN_INFO,
1362                         "Invalid log sectors per block(%u) log sectorsize(%u)",
1363                         le32_to_cpu(raw_super->log_sectors_per_block),
1364                         le32_to_cpu(raw_super->log_sectorsize));
1365                 return 1;
1366         }
1367
1368         /* check reserved ino info */
1369         if (le32_to_cpu(raw_super->node_ino) != 1 ||
1370                 le32_to_cpu(raw_super->meta_ino) != 2 ||
1371                 le32_to_cpu(raw_super->root_ino) != 3) {
1372                 f2fs_msg(sb, KERN_INFO,
1373                         "Invalid Fs Meta Ino: node(%u) meta(%u) root(%u)",
1374                         le32_to_cpu(raw_super->node_ino),
1375                         le32_to_cpu(raw_super->meta_ino),
1376                         le32_to_cpu(raw_super->root_ino));
1377                 return 1;
1378         }
1379
1380         /* check CP/SIT/NAT/SSA/MAIN_AREA area boundary */
1381         if (sanity_check_area_boundary(sbi, bh))
1382                 return 1;
1383
1384         return 0;
1385 }
1386
1387 int sanity_check_ckpt(struct f2fs_sb_info *sbi)
1388 {
1389         unsigned int total, fsmeta;
1390         struct f2fs_super_block *raw_super = F2FS_RAW_SUPER(sbi);
1391         struct f2fs_checkpoint *ckpt = F2FS_CKPT(sbi);
1392
1393         total = le32_to_cpu(raw_super->segment_count);
1394         fsmeta = le32_to_cpu(raw_super->segment_count_ckpt);
1395         fsmeta += le32_to_cpu(raw_super->segment_count_sit);
1396         fsmeta += le32_to_cpu(raw_super->segment_count_nat);
1397         fsmeta += le32_to_cpu(ckpt->rsvd_segment_count);
1398         fsmeta += le32_to_cpu(raw_super->segment_count_ssa);
1399
1400         if (unlikely(fsmeta >= total))
1401                 return 1;
1402
1403         if (unlikely(f2fs_cp_error(sbi))) {
1404                 f2fs_msg(sbi->sb, KERN_ERR, "A bug case: need to run fsck");
1405                 return 1;
1406         }
1407         return 0;
1408 }
1409
1410 static void init_sb_info(struct f2fs_sb_info *sbi)
1411 {
1412         struct f2fs_super_block *raw_super = sbi->raw_super;
1413
1414         sbi->log_sectors_per_block =
1415                 le32_to_cpu(raw_super->log_sectors_per_block);
1416         sbi->log_blocksize = le32_to_cpu(raw_super->log_blocksize);
1417         sbi->blocksize = 1 << sbi->log_blocksize;
1418         sbi->log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
1419         sbi->blocks_per_seg = 1 << sbi->log_blocks_per_seg;
1420         sbi->segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
1421         sbi->secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
1422         sbi->total_sections = le32_to_cpu(raw_super->section_count);
1423         sbi->total_node_count =
1424                 (le32_to_cpu(raw_super->segment_count_nat) / 2)
1425                         * sbi->blocks_per_seg * NAT_ENTRY_PER_BLOCK;
1426         sbi->root_ino_num = le32_to_cpu(raw_super->root_ino);
1427         sbi->node_ino_num = le32_to_cpu(raw_super->node_ino);
1428         sbi->meta_ino_num = le32_to_cpu(raw_super->meta_ino);
1429         sbi->cur_victim_sec = NULL_SECNO;
1430         sbi->max_victim_search = DEF_MAX_VICTIM_SEARCH;
1431
1432         sbi->dir_level = DEF_DIR_LEVEL;
1433         sbi->interval_time[CP_TIME] = DEF_CP_INTERVAL;
1434         sbi->interval_time[REQ_TIME] = DEF_IDLE_INTERVAL;
1435         clear_sbi_flag(sbi, SBI_NEED_FSCK);
1436
1437         INIT_LIST_HEAD(&sbi->s_list);
1438         mutex_init(&sbi->umount_mutex);
1439         mutex_init(&sbi->wio_mutex[NODE]);
1440         mutex_init(&sbi->wio_mutex[DATA]);
1441
1442 #ifdef CONFIG_F2FS_FS_ENCRYPTION
1443         memcpy(sbi->key_prefix, F2FS_KEY_DESC_PREFIX,
1444                                 F2FS_KEY_DESC_PREFIX_SIZE);
1445         sbi->key_prefix_size = F2FS_KEY_DESC_PREFIX_SIZE;
1446 #endif
1447 }
1448
1449 static int init_percpu_info(struct f2fs_sb_info *sbi)
1450 {
1451         int i, err;
1452
1453         for (i = 0; i < NR_COUNT_TYPE; i++) {
1454                 err = percpu_counter_init(&sbi->nr_pages[i], 0, GFP_KERNEL);
1455                 if (err)
1456                         return err;
1457         }
1458
1459         err = percpu_counter_init(&sbi->alloc_valid_block_count, 0, GFP_KERNEL);
1460         if (err)
1461                 return err;
1462
1463         return percpu_counter_init(&sbi->total_valid_inode_count, 0,
1464                                                                 GFP_KERNEL);
1465 }
1466
1467 /*
1468  * Read f2fs raw super block.
1469  * Because we have two copies of super block, so read both of them
1470  * to get the first valid one. If any one of them is broken, we pass
1471  * them recovery flag back to the caller.
1472  */
1473 static int read_raw_super_block(struct f2fs_sb_info *sbi,
1474                         struct f2fs_super_block **raw_super,
1475                         int *valid_super_block, int *recovery)
1476 {
1477         struct super_block *sb = sbi->sb;
1478         int block;
1479         struct buffer_head *bh;
1480         struct f2fs_super_block *super;
1481         int err = 0;
1482
1483         super = kzalloc(sizeof(struct f2fs_super_block), GFP_KERNEL);
1484         if (!super)
1485                 return -ENOMEM;
1486
1487         for (block = 0; block < 2; block++) {
1488                 bh = sb_bread(sb, block);
1489                 if (!bh) {
1490                         f2fs_msg(sb, KERN_ERR, "Unable to read %dth superblock",
1491                                 block + 1);
1492                         err = -EIO;
1493                         continue;
1494                 }
1495
1496                 /* sanity checking of raw super */
1497                 if (sanity_check_raw_super(sbi, bh)) {
1498                         f2fs_msg(sb, KERN_ERR,
1499                                 "Can't find valid F2FS filesystem in %dth superblock",
1500                                 block + 1);
1501                         err = -EINVAL;
1502                         brelse(bh);
1503                         continue;
1504                 }
1505
1506                 if (!*raw_super) {
1507                         memcpy(super, bh->b_data + F2FS_SUPER_OFFSET,
1508                                                         sizeof(*super));
1509                         *valid_super_block = block;
1510                         *raw_super = super;
1511                 }
1512                 brelse(bh);
1513         }
1514
1515         /* Fail to read any one of the superblocks*/
1516         if (err < 0)
1517                 *recovery = 1;
1518
1519         /* No valid superblock */
1520         if (!*raw_super)
1521                 kfree(super);
1522         else
1523                 err = 0;
1524
1525         return err;
1526 }
1527
1528 int f2fs_commit_super(struct f2fs_sb_info *sbi, bool recover)
1529 {
1530         struct buffer_head *bh;
1531         int err;
1532
1533         if ((recover && f2fs_readonly(sbi->sb)) ||
1534                                 bdev_read_only(sbi->sb->s_bdev)) {
1535                 set_sbi_flag(sbi, SBI_NEED_SB_WRITE);
1536                 return -EROFS;
1537         }
1538
1539         /* write back-up superblock first */
1540         bh = sb_getblk(sbi->sb, sbi->valid_super_block ? 0: 1);
1541         if (!bh)
1542                 return -EIO;
1543         err = __f2fs_commit_super(bh, F2FS_RAW_SUPER(sbi));
1544         brelse(bh);
1545
1546         /* if we are in recovery path, skip writing valid superblock */
1547         if (recover || err)
1548                 return err;
1549
1550         /* write current valid superblock */
1551         bh = sb_getblk(sbi->sb, sbi->valid_super_block);
1552         if (!bh)
1553                 return -EIO;
1554         err = __f2fs_commit_super(bh, F2FS_RAW_SUPER(sbi));
1555         brelse(bh);
1556         return err;
1557 }
1558
1559 static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
1560 {
1561         struct f2fs_sb_info *sbi;
1562         struct f2fs_super_block *raw_super;
1563         struct inode *root;
1564         int err;
1565         bool retry = true, need_fsck = false;
1566         char *options = NULL;
1567         int recovery, i, valid_super_block;
1568         struct curseg_info *seg_i;
1569
1570 try_onemore:
1571         err = -EINVAL;
1572         raw_super = NULL;
1573         valid_super_block = -1;
1574         recovery = 0;
1575
1576         /* allocate memory for f2fs-specific super block info */
1577         sbi = kzalloc(sizeof(struct f2fs_sb_info), GFP_KERNEL);
1578         if (!sbi)
1579                 return -ENOMEM;
1580
1581         sbi->sb = sb;
1582
1583         /* Load the checksum driver */
1584         sbi->s_chksum_driver = crypto_alloc_shash("crc32", 0, 0);
1585         if (IS_ERR(sbi->s_chksum_driver)) {
1586                 f2fs_msg(sb, KERN_ERR, "Cannot load crc32 driver.");
1587                 err = PTR_ERR(sbi->s_chksum_driver);
1588                 sbi->s_chksum_driver = NULL;
1589                 goto free_sbi;
1590         }
1591
1592         /* set a block size */
1593         if (unlikely(!sb_set_blocksize(sb, F2FS_BLKSIZE))) {
1594                 f2fs_msg(sb, KERN_ERR, "unable to set blocksize");
1595                 goto free_sbi;
1596         }
1597
1598         err = read_raw_super_block(sbi, &raw_super, &valid_super_block,
1599                                                                 &recovery);
1600         if (err)
1601                 goto free_sbi;
1602
1603         sb->s_fs_info = sbi;
1604         default_options(sbi);
1605         /* parse mount options */
1606         options = kstrdup((const char *)data, GFP_KERNEL);
1607         if (data && !options) {
1608                 err = -ENOMEM;
1609                 goto free_sb_buf;
1610         }
1611
1612         err = parse_options(sb, options);
1613         if (err)
1614                 goto free_options;
1615
1616         sbi->max_file_blocks = max_file_blocks();
1617         sb->s_maxbytes = sbi->max_file_blocks <<
1618                                 le32_to_cpu(raw_super->log_blocksize);
1619         sb->s_max_links = F2FS_LINK_MAX;
1620         get_random_bytes(&sbi->s_next_generation, sizeof(u32));
1621
1622         sb->s_op = &f2fs_sops;
1623         sb->s_cop = &f2fs_cryptops;
1624         sb->s_xattr = f2fs_xattr_handlers;
1625         sb->s_export_op = &f2fs_export_ops;
1626         sb->s_magic = F2FS_SUPER_MAGIC;
1627         sb->s_time_gran = 1;
1628         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
1629                 (test_opt(sbi, POSIX_ACL) ? MS_POSIXACL : 0);
1630         memcpy(sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
1631
1632         /* init f2fs-specific super block info */
1633         sbi->raw_super = raw_super;
1634         sbi->valid_super_block = valid_super_block;
1635         mutex_init(&sbi->gc_mutex);
1636         mutex_init(&sbi->cp_mutex);
1637         init_rwsem(&sbi->node_write);
1638
1639         /* disallow all the data/node/meta page writes */
1640         set_sbi_flag(sbi, SBI_POR_DOING);
1641         spin_lock_init(&sbi->stat_lock);
1642
1643         init_rwsem(&sbi->read_io.io_rwsem);
1644         sbi->read_io.sbi = sbi;
1645         sbi->read_io.bio = NULL;
1646         for (i = 0; i < NR_PAGE_TYPE; i++) {
1647                 init_rwsem(&sbi->write_io[i].io_rwsem);
1648                 sbi->write_io[i].sbi = sbi;
1649                 sbi->write_io[i].bio = NULL;
1650         }
1651
1652         init_rwsem(&sbi->cp_rwsem);
1653         init_waitqueue_head(&sbi->cp_wait);
1654         init_sb_info(sbi);
1655
1656         err = init_percpu_info(sbi);
1657         if (err)
1658                 goto free_options;
1659
1660         /* get an inode for meta space */
1661         sbi->meta_inode = f2fs_iget(sb, F2FS_META_INO(sbi));
1662         if (IS_ERR(sbi->meta_inode)) {
1663                 f2fs_msg(sb, KERN_ERR, "Failed to read F2FS meta data inode");
1664                 err = PTR_ERR(sbi->meta_inode);
1665                 goto free_options;
1666         }
1667
1668         err = get_valid_checkpoint(sbi);
1669         if (err) {
1670                 f2fs_msg(sb, KERN_ERR, "Failed to get valid F2FS checkpoint");
1671                 goto free_meta_inode;
1672         }
1673
1674         sbi->total_valid_node_count =
1675                                 le32_to_cpu(sbi->ckpt->valid_node_count);
1676         percpu_counter_set(&sbi->total_valid_inode_count,
1677                                 le32_to_cpu(sbi->ckpt->valid_inode_count));
1678         sbi->user_block_count = le64_to_cpu(sbi->ckpt->user_block_count);
1679         sbi->total_valid_block_count =
1680                                 le64_to_cpu(sbi->ckpt->valid_block_count);
1681         sbi->last_valid_block_count = sbi->total_valid_block_count;
1682
1683         for (i = 0; i < NR_INODE_TYPE; i++) {
1684                 INIT_LIST_HEAD(&sbi->inode_list[i]);
1685                 spin_lock_init(&sbi->inode_lock[i]);
1686         }
1687
1688         init_extent_cache_info(sbi);
1689
1690         init_ino_entry_info(sbi);
1691
1692         /* setup f2fs internal modules */
1693         err = build_segment_manager(sbi);
1694         if (err) {
1695                 f2fs_msg(sb, KERN_ERR,
1696                         "Failed to initialize F2FS segment manager");
1697                 goto free_sm;
1698         }
1699         err = build_node_manager(sbi);
1700         if (err) {
1701                 f2fs_msg(sb, KERN_ERR,
1702                         "Failed to initialize F2FS node manager");
1703                 goto free_nm;
1704         }
1705
1706         /* For write statistics */
1707         if (sb->s_bdev->bd_part)
1708                 sbi->sectors_written_start =
1709                         (u64)part_stat_read(sb->s_bdev->bd_part, sectors[1]);
1710
1711         /* Read accumulated write IO statistics if exists */
1712         seg_i = CURSEG_I(sbi, CURSEG_HOT_NODE);
1713         if (__exist_node_summaries(sbi))
1714                 sbi->kbytes_written =
1715                         le64_to_cpu(seg_i->journal->info.kbytes_written);
1716
1717         build_gc_manager(sbi);
1718
1719         /* get an inode for node space */
1720         sbi->node_inode = f2fs_iget(sb, F2FS_NODE_INO(sbi));
1721         if (IS_ERR(sbi->node_inode)) {
1722                 f2fs_msg(sb, KERN_ERR, "Failed to read node inode");
1723                 err = PTR_ERR(sbi->node_inode);
1724                 goto free_nm;
1725         }
1726
1727         f2fs_join_shrinker(sbi);
1728
1729         /* if there are nt orphan nodes free them */
1730         err = recover_orphan_inodes(sbi);
1731         if (err)
1732                 goto free_node_inode;
1733
1734         /* read root inode and dentry */
1735         root = f2fs_iget(sb, F2FS_ROOT_INO(sbi));
1736         if (IS_ERR(root)) {
1737                 f2fs_msg(sb, KERN_ERR, "Failed to read root inode");
1738                 err = PTR_ERR(root);
1739                 goto free_node_inode;
1740         }
1741         if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
1742                 iput(root);
1743                 err = -EINVAL;
1744                 goto free_node_inode;
1745         }
1746
1747         sb->s_root = d_make_root(root); /* allocate root dentry */
1748         if (!sb->s_root) {
1749                 err = -ENOMEM;
1750                 goto free_root_inode;
1751         }
1752
1753         err = f2fs_build_stats(sbi);
1754         if (err)
1755                 goto free_root_inode;
1756
1757         if (f2fs_proc_root)
1758                 sbi->s_proc = proc_mkdir(sb->s_id, f2fs_proc_root);
1759
1760         if (sbi->s_proc) {
1761                 proc_create_data("segment_info", S_IRUGO, sbi->s_proc,
1762                                  &f2fs_seq_segment_info_fops, sb);
1763                 proc_create_data("segment_bits", S_IRUGO, sbi->s_proc,
1764                                  &f2fs_seq_segment_bits_fops, sb);
1765         }
1766
1767         sbi->s_kobj.kset = f2fs_kset;
1768         init_completion(&sbi->s_kobj_unregister);
1769         err = kobject_init_and_add(&sbi->s_kobj, &f2fs_ktype, NULL,
1770                                                         "%s", sb->s_id);
1771         if (err)
1772                 goto free_proc;
1773
1774         /* recover fsynced data */
1775         if (!test_opt(sbi, DISABLE_ROLL_FORWARD)) {
1776                 /*
1777                  * mount should be failed, when device has readonly mode, and
1778                  * previous checkpoint was not done by clean system shutdown.
1779                  */
1780                 if (bdev_read_only(sb->s_bdev) &&
1781                                 !is_set_ckpt_flags(sbi->ckpt, CP_UMOUNT_FLAG)) {
1782                         err = -EROFS;
1783                         goto free_kobj;
1784                 }
1785
1786                 if (need_fsck)
1787                         set_sbi_flag(sbi, SBI_NEED_FSCK);
1788
1789                 err = recover_fsync_data(sbi, false);
1790                 if (err < 0) {
1791                         need_fsck = true;
1792                         f2fs_msg(sb, KERN_ERR,
1793                                 "Cannot recover all fsync data errno=%d", err);
1794                         goto free_kobj;
1795                 }
1796         } else {
1797                 err = recover_fsync_data(sbi, true);
1798
1799                 if (!f2fs_readonly(sb) && err > 0) {
1800                         err = -EINVAL;
1801                         f2fs_msg(sb, KERN_ERR,
1802                                 "Need to recover fsync data");
1803                         goto free_kobj;
1804                 }
1805         }
1806
1807         /* recover_fsync_data() cleared this already */
1808         clear_sbi_flag(sbi, SBI_POR_DOING);
1809
1810         /*
1811          * If filesystem is not mounted as read-only then
1812          * do start the gc_thread.
1813          */
1814         if (test_opt(sbi, BG_GC) && !f2fs_readonly(sb)) {
1815                 /* After POR, we can run background GC thread.*/
1816                 err = start_gc_thread(sbi);
1817                 if (err)
1818                         goto free_kobj;
1819         }
1820         kfree(options);
1821
1822         /* recover broken superblock */
1823         if (recovery) {
1824                 err = f2fs_commit_super(sbi, true);
1825                 f2fs_msg(sb, KERN_INFO,
1826                         "Try to recover %dth superblock, ret: %d",
1827                         sbi->valid_super_block ? 1 : 2, err);
1828         }
1829
1830         f2fs_update_time(sbi, CP_TIME);
1831         f2fs_update_time(sbi, REQ_TIME);
1832         return 0;
1833
1834 free_kobj:
1835         f2fs_sync_inode_meta(sbi);
1836         kobject_del(&sbi->s_kobj);
1837         kobject_put(&sbi->s_kobj);
1838         wait_for_completion(&sbi->s_kobj_unregister);
1839 free_proc:
1840         if (sbi->s_proc) {
1841                 remove_proc_entry("segment_info", sbi->s_proc);
1842                 remove_proc_entry("segment_bits", sbi->s_proc);
1843                 remove_proc_entry(sb->s_id, f2fs_proc_root);
1844         }
1845         f2fs_destroy_stats(sbi);
1846 free_root_inode:
1847         dput(sb->s_root);
1848         sb->s_root = NULL;
1849 free_node_inode:
1850         mutex_lock(&sbi->umount_mutex);
1851         f2fs_leave_shrinker(sbi);
1852         iput(sbi->node_inode);
1853         mutex_unlock(&sbi->umount_mutex);
1854 free_nm:
1855         destroy_node_manager(sbi);
1856 free_sm:
1857         destroy_segment_manager(sbi);
1858         kfree(sbi->ckpt);
1859 free_meta_inode:
1860         make_bad_inode(sbi->meta_inode);
1861         iput(sbi->meta_inode);
1862 free_options:
1863         destroy_percpu_info(sbi);
1864         kfree(options);
1865 free_sb_buf:
1866         kfree(raw_super);
1867 free_sbi:
1868         if (sbi->s_chksum_driver)
1869                 crypto_free_shash(sbi->s_chksum_driver);
1870         kfree(sbi);
1871
1872         /* give only one another chance */
1873         if (retry) {
1874                 retry = false;
1875                 shrink_dcache_sb(sb);
1876                 goto try_onemore;
1877         }
1878         return err;
1879 }
1880
1881 static struct dentry *f2fs_mount(struct file_system_type *fs_type, int flags,
1882                         const char *dev_name, void *data)
1883 {
1884         return mount_bdev(fs_type, flags, dev_name, data, f2fs_fill_super);
1885 }
1886
1887 static void kill_f2fs_super(struct super_block *sb)
1888 {
1889         if (sb->s_root)
1890                 set_sbi_flag(F2FS_SB(sb), SBI_IS_CLOSE);
1891         kill_block_super(sb);
1892 }
1893
1894 static struct file_system_type f2fs_fs_type = {
1895         .owner          = THIS_MODULE,
1896         .name           = "f2fs",
1897         .mount          = f2fs_mount,
1898         .kill_sb        = kill_f2fs_super,
1899         .fs_flags       = FS_REQUIRES_DEV,
1900 };
1901 MODULE_ALIAS_FS("f2fs");
1902
1903 static int __init init_inodecache(void)
1904 {
1905         f2fs_inode_cachep = kmem_cache_create("f2fs_inode_cache",
1906                         sizeof(struct f2fs_inode_info), 0,
1907                         SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, NULL);
1908         if (!f2fs_inode_cachep)
1909                 return -ENOMEM;
1910         return 0;
1911 }
1912
1913 static void destroy_inodecache(void)
1914 {
1915         /*
1916          * Make sure all delayed rcu free inodes are flushed before we
1917          * destroy cache.
1918          */
1919         rcu_barrier();
1920         kmem_cache_destroy(f2fs_inode_cachep);
1921 }
1922
1923 static int __init init_f2fs_fs(void)
1924 {
1925         int err;
1926
1927         f2fs_build_trace_ios();
1928
1929         err = init_inodecache();
1930         if (err)
1931                 goto fail;
1932         err = create_node_manager_caches();
1933         if (err)
1934                 goto free_inodecache;
1935         err = create_segment_manager_caches();
1936         if (err)
1937                 goto free_node_manager_caches;
1938         err = create_checkpoint_caches();
1939         if (err)
1940                 goto free_segment_manager_caches;
1941         err = create_extent_cache();
1942         if (err)
1943                 goto free_checkpoint_caches;
1944         f2fs_kset = kset_create_and_add("f2fs", NULL, fs_kobj);
1945         if (!f2fs_kset) {
1946                 err = -ENOMEM;
1947                 goto free_extent_cache;
1948         }
1949 #ifdef CONFIG_F2FS_FAULT_INJECTION
1950         f2fs_fault_inject.kset = f2fs_kset;
1951         f2fs_build_fault_attr(0);
1952         err = kobject_init_and_add(&f2fs_fault_inject, &f2fs_fault_ktype,
1953                                 NULL, "fault_injection");
1954         if (err) {
1955                 f2fs_fault_inject.kset = NULL;
1956                 goto free_kset;
1957         }
1958 #endif
1959         err = register_shrinker(&f2fs_shrinker_info);
1960         if (err)
1961                 goto free_kset;
1962
1963         err = register_filesystem(&f2fs_fs_type);
1964         if (err)
1965                 goto free_shrinker;
1966         err = f2fs_create_root_stats();
1967         if (err)
1968                 goto free_filesystem;
1969         f2fs_proc_root = proc_mkdir("fs/f2fs", NULL);
1970         return 0;
1971
1972 free_filesystem:
1973         unregister_filesystem(&f2fs_fs_type);
1974 free_shrinker:
1975         unregister_shrinker(&f2fs_shrinker_info);
1976 free_kset:
1977 #ifdef CONFIG_F2FS_FAULT_INJECTION
1978         if (f2fs_fault_inject.kset)
1979                 kobject_put(&f2fs_fault_inject);
1980 #endif
1981         kset_unregister(f2fs_kset);
1982 free_extent_cache:
1983         destroy_extent_cache();
1984 free_checkpoint_caches:
1985         destroy_checkpoint_caches();
1986 free_segment_manager_caches:
1987         destroy_segment_manager_caches();
1988 free_node_manager_caches:
1989         destroy_node_manager_caches();
1990 free_inodecache:
1991         destroy_inodecache();
1992 fail:
1993         return err;
1994 }
1995
1996 static void __exit exit_f2fs_fs(void)
1997 {
1998         remove_proc_entry("fs/f2fs", NULL);
1999         f2fs_destroy_root_stats();
2000         unregister_filesystem(&f2fs_fs_type);
2001         unregister_shrinker(&f2fs_shrinker_info);
2002 #ifdef CONFIG_F2FS_FAULT_INJECTION
2003         kobject_put(&f2fs_fault_inject);
2004 #endif
2005         kset_unregister(f2fs_kset);
2006         destroy_extent_cache();
2007         destroy_checkpoint_caches();
2008         destroy_segment_manager_caches();
2009         destroy_node_manager_caches();
2010         destroy_inodecache();
2011         f2fs_destroy_trace_ios();
2012 }
2013
2014 module_init(init_f2fs_fs)
2015 module_exit(exit_f2fs_fs)
2016
2017 MODULE_AUTHOR("Samsung Electronics's Praesto Team");
2018 MODULE_DESCRIPTION("Flash Friendly File System");
2019 MODULE_LICENSE("GPL");